Carrier 48VTN User Manual

48VT(N)---A

Performancet 14 SEER Single---Packaged HYBRID HEAT®

Dual Fuel System with Puronr (R---410A) Refrigerant

Single And Three Phase

2 --- 5 N o m i n a l To n s ( S i z e s 2 4 --- 6 0 )

Installation Instructions

NOTE: Read the entire instruction manual before starting the

installation.

NOTE: Installer: Make sure the Owner’s Manual and Service

Instructions are left with the unit after installation.

TABLE OF CONTENTS

PAGE

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

RECEIVING AND INSTALLATION . . . . . . . . . . . . . . . . . 2--13

Check Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Identify Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Inspect Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Provide Unit Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Slab Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Field Fabricate Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Provide Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Connect Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Install Flue Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Install Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

A09042

Fig. 1 -- Unit 48VT--A

Install Duct Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Configuring Units for Downflow (Vertical)

Outdoor Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Electrical Controls and Wiring . . . . . . . . . . . . . . . . . . . . . . . 29

Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Gas Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Check Defrost Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

PuronR Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

START--UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Install Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . 11

High--Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . 11

Special Procedures for 208--V Operation . . . . . . . . . . . . . . 11

Control Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . 11

Balance Point Setting Thermidistat or Hybrid Heat

Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Transformer Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

PRE--START--UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

START--UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13--17

Check for Refrigerant Leaks . . . . . . . . . . . . . . . . . . . . . . . . . 13

Unit Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . 13

Start--Up Heating and Make Adjustments . . . . . . . . . . . . . . . 13

Checking Heating Control . . . . . . . . . . . . . . . . . . . . . . . . . 14

Check Gas Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Adjust Gas Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Check Burner Flame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Start--Up Cooling and Make Adjustments . . . . . . . . . . . . . . . 16

Checking Cooling Control Operation . . . . . . . . . . . . . . . . 16

Checking and Adjusting Refrigerant . . . . . . . . . . . . . . . . . 16

Indoor Airflow and Airflow Adjustments . . . . . . . . . . . . . 16

Continuous Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . 17

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27--33

Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Indoor Blower and Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Flue Gas Passageways . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Limit Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Burner Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Main Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Outdoor Coil, Indoor Coil, & Condensate Drain Pan . . . . . . 28

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service maintenance,

or use can cause explosion, fire, electrical shock, or other

conditions which may cause death, personal injury, or property

damage. Consult a qualified installer, service agency, or your

distributor or branch for information or assistance. The qualified

installer or agency must use factory--authorized kits or accessories

when modifying this product. Refer to the individual instructions

packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses, protective clothing,

and work gloves. Have a fire extinguisher available. Read these

instructions thoroughly and follow all warnings or cautions

included in literature and attached to the unit. consult local

building codes, the current editions of the National Fuel Gas Code

(NFGC) NFPA 54/ANSI Z223.1, and the National Electrical Code

(NEC) NFPA 70.

In Canada refer to the current editions of the National Standards of

Canada CAN/CSA--B149.1 and .2 Natural Gas and Propane

Installation codes, and Canadian Electrical Code CSA C22.1

Recognize safety information. This is the safety--alert symbol

When you see this symbol on the unit and in instructions or manu-

als, be alert to the potential for personal injury. Understand these

A09146

Fig. 2 -- 48VT--A24--30 Unit Dimensions

A09147

Fig. 3 -- 48VT--A36--60 Unit Dimensions

HVAC unit

basepan

HVAC unit

base rails

Sealing

Gasket

Roofcurb

Anchor screw

Wood nailer*

Roofcurb*

Flashing field

supplied

Insulation

(field supplied)

Roofing material

field supplied

Cant strip

field supplied

SMALL CURB

A09110

*Provided with roofcurb

A09090

ROOF CURB DETAIL

LARGE CURB

A09095

A09111

CATALOG

NUMBER

UNIT SIZE

IN. (mm)

IN. (mm)*

IN. (mm)

CPRFCURB010A00

CPRFCURB011A00

CPRFCURB012A00

CPRFCURB013A00

11 (279)

14 (356)

11 (279)

14 (356)

Small

Large

10 (254)

32.4 (822)

16 (406)

47.8 (1214)

2.7 (69)

14 (356)

43.9 (1116)

NOTES:

1. Roof curb must be set up for unit being installed.

2. Seal strip must be applied, as required, to unit being installed.

3. Roof curb is made of 16--gauge steel.

4. Attach ductwork to curb (flanges of duct rest on curb).

5. Insulated panels: 1--in. (25.4 mm) thick fiberglass 1 lb. density.

IMPORTANT: Do not install large base pan HYBRID HEAT

units onto the small base pan (common curb). The center of gravity

on a large base pan HYBRID HEAT unit could overhang the curb

causing an unsafe condition. Before installing any large base pan

unit onto the common curb, check the “Y” distance in the product

literature dimensional drawing to ensure that “Y” is greater than 14

in. (356 mm). Do not install any large base pan unit onto the

common curb with a “Y” dimension (center of gravity) less than 14

in. (356 mm).

Fig. 4 -- Roof Curb Dimensions

CAUTION - NOTICE TO RIGGERS

PRUDENCE - AVIS AUX MANIPULATEUR

ACCESS PANELS MUST BE IN PLACE WHEN RIGGING.

PANNEAUX D'ACCES DOIT ÊTRE EN PLACE POUR MANIPULATION.

Use top skid as spreader bar. / Utiliser la palette du haut comme barre de répartition

DUCTS

MINIMUM HEIGHT: 36" (914.4 mm)

HAUTEUR MINIMUM

BANDE SCELLANT DOIT ÊTRE

EN PLACE AVANT DE PLACER

L'UNITÉ SUR LA BASE DE TOIT

SEAL STRIP MUST BE IN

PLACE BEFORE PLACING

UNIT ON ROOF CURB

UNIT HEIGHT

HAUTEUR D'UNITÉ

DETAIL A

VOIR DÉTAIL A

SEE DETAIL A

VOIR DÉTAIL A

50CY502286 2.0

A09051

Unit

368

543

Rigging

Weight

Rigging

Weight

167

378

171

450

204

491

223

513

233

246

NOTE: See dimensional drawing for corner weight distribution.

Fig. 5 -- 48VT--A Suggested Rigging

Inspection

Step 5 — Rig and Place Unit

Prior to initial use, and at monthly intervals, all rigging shackles,

clevis pins, and straps should be visually inspected for any

damage, evidence of wear, structural deformation, or cracks.

Particular attention should be paid to excessive wear at hoist

hooking points and load support areas. Materials showing any kind

of wear in these areas must not be used and should be discarded.

WARNING

PERSONAL INJURY OR PROPERTY DAMAGE

HAZARD

Failure to follow this warning could result in personal

injury, death or property damage.

WARNING

When installing the unit on a rooftop, be sure the roof will

support the additional weight.

UNIT FALLING HAZARD

Rigging and handling of this equipment can be hazardous for

many reasons due to the installation location (roofs, elevated

structures, etc.).

Failure to follow this warning could result in personal

injury or death.

Never stand beneath rigged units or lift over people.

Only trained, qualified crane operators and ground support staff

should handle and install this equipment.

When working with this equipment, observe precautions in the

literature, on tags, stickers, and labels attached to the equipment,

and any other safety precautions that might apply.

WARNING

PROPERTY DAMAGE HAZARD

Training for operators of the lifting equipment should include, but

not be limited to, the following:

Failure to follow this warning could result in personal

injury/death or property damage.

1. Application of the lifter to the load, and adjustment of the

lifts to adapt to various sizes or kinds of loads.

When straps are taut, the clevis should be a minimum of 36

in. (914 mm) above the unit top cover.

2. Instruction in any special operation or precaution.

3. Condition of the load as it relates to operation of the lifting

kit, such as balance, temperature, etc.

Rigging/Lifting of Unit (See Fig. 5)

Lifting holes are provided in base rails as shown in Fig. 2 and 3.

1. Leave top shipping skid on the unit for use as a spreader bar

to prevent the rigging straps from damaging the unit. If the

skid is not available, use a spreader bar of sufficient length

to protect the unit from damage.

Follow all applicable safety codes. Wear safety shoes and work

gloves.

2. Attach shackles, clevis pins, and straps to the base rails of

the unit. Be sure materials are rated to hold the weight of the

unit (See Fig. 5).

3. Attach a clevis of sufficient strength in the middle of the

straps. Adjust the clevis location to ensure unit is lifted level

with the ground.

Install the flue hood as follows:

1. This installation must conform with local building codes

and with the National Fuel Gas Code (NFGC) NFPA 54 /

ANSI Z223.1, (in Canada, CAN/CGA B149.1, and

B149.2) latest revision. Refer to Provincial and local

plumbing or wastewater codes and other applicable local

codes.

2. Remove flue hood from shipping location (inside the return

section of the blower compartment--see Fig. 8). Remove the

return duct cover to locate the flue hood. Place flue hood

assembly over flue panel. Orient screw holes in flue hood

with holes in the flue panel.

After the unit is placed on the roof curb or mounting pad, remove

the top skid.

Step 6 — Connect Condensate Drain

NOTE: When installing condensate drain connection be sure to

comply with local codes and restrictions.

Model 48VT--A disposes of condensate water through a 3/4 in.

NPT fitting which exits through the compressor access panel (See

Fig. 2 and 3 for location).

Condensate water can be drained directly onto the roof in rooftop

installations (where permitted) or onto a gravel apron in ground

level installations. Install a field--supplied condensate trap at end

of condensate connection to ensure proper drainage. Make sure that

the outlet of the trap is at least 1 in. (25 mm) lower than the

drain--pan condensate connection to prevent the pan from

overflowing (See Fig. 6). Prime the trap with water. When using a

gravel apron, make sure it slopes away from the unit.

If the installation requires draining the condensate water away

from the unit, install a 2--in. (51 mm) trap at the condensate

connection to ensure proper drainage (See Fig. 6). Make sure that

the outlet of the trap is at least 1 in. (25 mm) lower than the

drain--pan condensate connection. This prevents the pan from

overflowing.

3. Secure flue hood to flue panel by inserting a single screw on

the top flange and the bottom flange of the hood.

Step 8 — Install Gas Piping

The gas supply pipe enters the unit through the access hole

provided. The gas connection to the unit is made to the 1/2--in.

(12.7 mm) FPT gas inlet on the gas valve.

Install a gas supply line that runs to the heating section. Refer to

Table 2 and the NFGC for gas pipe sizing. Do not use cast--iron

pipe. It is recommended that a black iron pipe is used. Check the

local utility for recommendations concerning existing lines. Size

gas supply piping for 0.5 IN. W.C. maximum pressure drop. Never

use pipe smaller than the 1/2--in. (12.7 mm) FPT gas inlet on the

unit gas valve.

Prime the trap with water. Connect a drain tube -- using a minimum

of 3/4--in. PVC or 3/4--in. copper pipe (all field--supplied) -- at the

outlet end of the 2--in. (51 mm) trap. Do not undersize the tube.

Pitch the drain tube downward at a slope of at least 1--in. (25 mm)

for every 10 ft (3 m) of horizontal run. Be sure to check the drain

tube for leaks.

For natural gas applications, the gas pressure at unit gas connection

must not be less than 4.0 IN. W.C. or greater than 13 IN. W.C.

while the unit is operating. For propane applications, the gas

pressure must not be less than 11.0 IN. W.C. or greater than 13 IN.

W.C. at the unit connection.

A 1/8--in. (3.2 mm) NPT plugged tapping, accessible for test gauge

connection, must be installed immediately upstream of the gas

supply connection to the gas valve.

TRAP

OUTLET

When installing the gas supply line, observe local codes pertaining

to gas pipe installations. Refer to the NFGC NFPA 54/ANSI

Z223.1 latest edition (in Canada, CAN/CGA B149.1).

1-in. (25 mm) min.

NOTE: In the state of Massachusetts:

2-in. (51 mm) min.

1. Gas supply connections MUST be performed by a licensed

plumber or gas fitter.

2. When flexible connectors are used, the maximum length

shall not exceed 36 in. (915 mm).

A09052

Fig. 6 -- Condensate Trap

Step 7 — Install Flue Hood

3. When lever handle type manual equipment shutoff valves

are used, they shall be T--handle valves.

The flue assembly is secured and shipped in the return air duct.

Remove duct cover to locate the assembly (See Fig. 8).

4. The use of copper tubing for gas piping is NOT approved

by the state of Massachusetts.

NOTE:

Dedicated low NOx models MUST be installed in

In the absence of local building codes, adhere to the following

pertinent recommendations:

California Air Quality Management Districts where a Low NOx

rule exists.

1. Avoid low spots in long runs of pipe. Grade all pipe 1/4 in.

(6.35 mm) for every 15 ft (4.6 m) of length to prevent traps.

Grade all horizontal runs downward to risers. Use risers to

connect to heating section and to meter.

These models meet the California maximum oxides of nitrogen

(NOx) emissions requirements of 40 nanograms/joule or less as

shipped from the factory.

2. Protect all segments of piping system against physical and

thermal damage. Support all piping with appropriate straps,

hangers, etc. Use a minimum of one hanger every 6 ft (1.8

m). For pipe sizes larger than 1/2 in., (12.7 mm) follow

recommendations of national codes.

3. Apply joint compound (pipe dope) sparingly and only to

male threads of joint when making pipe connections. Use

only pipe dope that is resistant to action of liquefied

petroleum gases as specified by local and/or national codes.

Never use Teflon tape.

NOTE: Low NOx requirements apply only to natural gas

installations.

WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal

injury or death.

The venting system is designed to ensure proper venting.

The flue hood assembly must be installed as indicted in this

section of the unit installation instructions.

4. Install sediment trap in riser leading to heating section (See

Fig. 7). This drip leg functions as a trap for dirt and

condensate.

made specifically for the detection of leaks (or method

specified by local codes and/or regulations).

Step 9 — Install Duct Connections

The unit has duct flanges on the supply-- and return--air openings

on the side and bottom of the unit. For downshot applications, the

ductwork connects to the roof curb (See Fig. 2 and 3 for

connection sizes and locations).

Configuring Units for Downflow (Vertical) Discharge

WARNING

TEE

OUT

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death.

NIPPLE

CAP

Before installing or servicing system, always turn off main

power to system. There may be more than one disconnect

switch. Tag the disconnect switch with a suitable warning

label.

C99020

Fig. 7 -- Sediment Trap

5. Install an accessible, external, manual main shutoff valve in

gas supply pipe within 6 ft (1.8 m) of heating section.

6. Install ground--joint union close to heating section between

unit manual shutoff and external manual main shut--off

valve.

1. Open all electrical disconnects before starting any service

work.

2. Remove horizontal (metal) duct covers to access vertical

(downflow) discharge duct knockouts in unit basepan. (See

Fig. 8.)

3. Starting in a corner as shown in Fig. 9, score the panel in

both directions from the corner. Tap the panel out from the

scored corner using a small hammer. Be careful and not

damage any other part of the unit.

4. If unit ductwork is to be attached to vertical opening flanges

on the unit base (jackstand applications only), do so at this

time.

7. Pressure test all gas piping in accordance with local and

national plumbing and gas codes before connecting piping

to unit.

NOTE: Pressure test the gas supply system after the gas supply

piping is connected to the gas valve. The supply piping must be

disconnected from the gas valve during the testing of the piping

systems when test pressure is in excess of 0.5 psig. Pressure test the

gas supply piping system at pressures equal to or less than 0.5 psig.

The unit heating section must be isolated from the gas piping

system by closing the external main manual shutoff valve and

slightly opening the ground--joint union.

CAUTION

PROPERTY DAMAGE HAZARD

Failure to follow this caution may result in property damage.

Collect ALL screws that were removed. Do not leave screws

on rooftop as permanent damage to the roof may occur.

WARNING

5. It is recommended that the base insulation around the

perimeter of the vertical return--air opening be secured to

the base with aluminum tape. Applicable local codes may

require aluminum tape to prevent exposed fiberglass.

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury,

death and/or property damage.

--Connect gas pipe to unit using a backup wrench to avoid

damaging gas controls.

6. Reinstall both horizontal duct covers. Ensure opening is

air-- and watertight.

7. After completing unit conversion, perform all safety checks

and power up unit.

--Never purge a gas line into a combustion chamber. Never

test for gas leaks with an open flame. Use a commercially

available soap solution made specifically for the detection of

leaks to check all connections.

NOTE: The design and installation of the duct system must be in

accordance with the standards of the NFPA for installation of

nonresidence--type air conditioning and ventilating systems, NFPA

90A or residence--type, NFPA 90B; and/or local codes and

ordinances.

--Use proper length of pipe to avoid stress on gas control

manifold.

Adhere to the following criteria when selecting, sizing, and

installing the duct system:

--If a flexible connector is required or allowed by authority

having jurisdiction, black iron pipe shall be installed at

furnace gas valve and extend a minimum of 2 in. (51 mm)

outside furnace casing.

1. Units are shipped for horizontal duct installation (by

removing duct covers).

2. Select and size ductwork, supply--air registers, and

return--air grilles according to American Society of Heating,

Refrigeration and Air Conditioning Engineers (ASHRAE)

recommendations.

--If codes allow a flexible connector, always use a new

connector. do not use a connector which has previously

serviced another gas appliance.

3. Use flexible transition between rigid ductwork and unit to

prevent transmission of vibration. The transition may be

screwed or bolted to duct flanges. Use suitable gaskets to

ensure weather tight and airtight seal.

8. Check for gas leaks at the field--installed and

factory--installed gas lines after all piping connections have

been completed. Use a commercially available soap solution

Table 1 – Physical Data -- Unit 48VT--A

UNIT SIZE

NOMINAL CAPACITY ---ton

SHIPPING WEIGHT ---lb.

(kg)

024040

368

167

024060

368

167

030040

2 --- 1 / 2

378

030060

2 --- 1 / 2

378

036060

450

204

036090

450

204

042060

3 --- 1 / 2

491

042090

3 --- 1 / 2

491

171

223

COMPRESSORS

Quantity

Scroll

REFRIGERANT (R---410A)

Quantity ---lb

9.5

4.3

9.5

4.3

10.5

4.8

10.5

4.8

9.0

4.1

9.0

4.1

14.0

6.4

14.0

6.4

(kg)

REFRIGERANT METERING

DEVICE

Indoor---TXV, Outdoor---Accurater

OUTDOOR ORIFICE

0.038 (Left OD Coil)

0.040 (Right OD Coil)

.97/1.02

0.032 (2)

.81

0.032 (2)

.81

0.038 (2)

.97

0.038 (2)

.97

0.040 (2)

1.02

0.040 (2)

1.02

in. (qty)

(mm)

OUTDOOR COIL

Rows...Fins/in.

2...21

13.6

2...21

13.6

2...21

15.4

2...21

15.4

2...21

13.6

2...21

13.6

2...21

19.4

2...21

19.4

Fa c e A r e a --- s q f t

OUTDOOR FAN

Nominal Cfm

2500

559

2500

559

2600

559

2600

559

3000

559

3000

559

3500

Diameter---in.

(mm)

559

Motor Hp (Rpm)

INDOOR COIL

1/8 (825)

1/4 (1100)

1/8 (825)

3...17

3.7

3...17

3.7

3...17

3.7

3...17

3.7

3...17

4.7

3...17

4.7

3...17

4.7

3...17

4.7

Rows...Fins/in.

Fa c e A r e a --- s q f t

INDOOR BLOWER

Nominal Cooling Airflow---(CFM)

S i z e --- i n .

800

10x10

254x254

1/2

800

10x10

254x254

1/2

1000

10x10

254x254

1/2

1000

10x10

254x254

1/2

1200

11x10

279x254

3/4

1200

11x10

279x254

3/4

1400

11x10

279x254

3/4

1400

11x10

279x254

3/4

(mm)

M o t o r --- h p

FURNACE SECTION*

Burner Orifice

2...44

2...55

2...38

2...53

2...44

2...55

2...44

2...53

2...38

2...53

3...38

3...53

2...38

2...53

3...38

3...53

Natural Gas Qty...Drill Size

Propane GasQty...Drill Size

HIGH---PRESSURE SWITCH

( p s i g ) C u t --- o u t

650 +/---15

420 +/---25

Reset (Auto)

L O S S --- O F --- C H A R G E /

LOW---PRESSURE SWITCH

(Liquid Line) (psig)

C u t --- o u t

2 0 +/ --- 5

45 +/---10

Reset (auto)

RETURN---AIR FILTERS † }

Throwaway (in.)

(mm)

20x20x1

508x508x25

20x24x1

508x610x25

24x30x1

610x762x25

*Based on altitude of 0 to 2000 ft (0---610 m).

{Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of

300 ft/minute for high---capacity type. Air filter pressure drop for non---standard filters must not exceed 0.08 IN. W.C.

} If using accessory filter rack refer to filter rack installation instructions for correct filter size and quantity.

Horizontal Duct Covers

A09076

INSTRUCTIONS FOR REMOVING DOWNSHOT PANELS

1. Score groove in corner 1 in both directions as far as you can reach.

2. Starting in corner 1, tap-out all sides with a small hammer. Be careful

not to damage any other part of unit.

3. If side from corner 3 to 4 is not accessible due to heat exchanger,

pivot panel up and down by hand until remaining side breaks off.

Basepan

Downflow

(Vertical)

Supply

Basepan

A09054

Downflow

(Vertical)

Return

Fig. 9 -- Vertical (Downflow) Discharge Duct Knockouts

Knockout

A09077

Fig. 8 -- Supply and Return Duct Opening

Table 1 -- Physical Data -- Unit 48VT--A Cont’d)

UNIT SIZE

NOMINAL CAPACITY ---ton

SHIPPING WEIGHT---lb

(kg)

048090

048115

048130

060090

060115

060130

513

233

513

233

513

233

543

246

543

246

546

246

COMPRESSORS

Quantity

Scroll

REFRIGERANT (R---410A)

Quantity ---lb

17.0

7.7

17.0

7.7

17.0

7.7

16.0

7.3

16.0

7.3

16.0

7.3

(kg )

REFRIGERANT METERING DEVICE

OUTDOOR ORIFICE---in. (qty)

(mm)

TXV

0.040 (2)

1.02

0.049 (2)

1.24

OUTDOOR COIL

Rows...Fins---in.

Fa c e A r e a --- s q f t

OUTDOOR FAN

Nominal Cfm

2...21

19.4

2...21

19.4

2...21

19.4

2...21

23.3

2...21

23.3

2...21

23.3

3500

559

3500

559

3500

559

3800

559

3800

559

3800

559

Diameter---in.

(mm)

M o t o r H p --- R p m

INDOOR COIL

1/4 (1100)

1/3 (1100)

3...17

5.7

3...17

5.7

3...17

5.7

4...17

5.7

4...17

5.7

4...17

5.7

Rows...Fins---in.

Fa c e A r e a --- s q f t

INDOOR BLOWER

Nominal Cooling Airflow---(CFM)

S i z e --- i n .

1600

11x10

279x254

1.0

1600

11x10

279x254

1.0

1600

11x10

279x254

1.0

1750

11x10

279x254

1.0

1750

11x10

279x254

1.0

1750

11x10

279x254

1.0

(mm)

M o t o r --- h p

FURNACE SECTION*

Burner Orifice

3...38

3...53

3...33

3...51

3...31

3...49

3...38

3...53

3...33

3...51

3...31

3...49

Natural Gas Qty...Drill Size

Propane GasQty...Drill Size

HIGH---PRESSURE SWITCH (psig)

C u t --- o u t

650 +/---15

420 +/---25

Reset (Auto)

L O S S --- O F --- C H A R G E /

LOW---PRESSURE SWITCH

(Liquid Line) (psig)

C u t --- o u t

20 +/ --- 5

45 +/---10

Reset (auto)

RETURN---AIR FILTERS †

Throwaway (in.)

(mm)

24x36x1

(610x914x25)

*Based on altitude of 0 to 2000 ft (0---610 m).

{Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of

300 ft/minute for high---capacity type. Air filter pressure drop for non---standard filters must not exceed 0.08 IN. W.C.

} If using accessory filter rack refer to filter rack installation instructions for correct filter size and quantity.

Table 2 – Maximum Gas Flow Capacity*

NOMINAL

IRON

PIPE, SIZE

(IN.)

LENGTH OF PIPE, FT (m)†

INTERNAL

DIAMETER

(IN.)

(21.3)

(24.4)

(27.4)

100

125

150

175

200

(3.0)

(6.1)

(9.1)

(12.2)

(15.2)

(18.3)

(30.5)

(31.1)

(45.7)

(53.3)

(61.0)

1/2

.622

.824

1.049

1.380

1.610

175

360

120

250

200

375

770

1180

175

360

550

160

325

500

—

145

300

460

—

135

280

430

3/4

1 --- 1/4

1 --- 1/2

170

320

600

990

151

285

580

900

138

260

530

810

125

240

490

750

118

220

460

690

110

205

430

650

103

195

400

620

680

465

1400

2100

950

1460

* Capacity of pipe in cu ft of gas per hr for gas pressure of 0.5 psig or less. Pressure drop of 0.5--IN. W.C. (based on a 0.60 specific gravity gas). Refer to Table 2

and the NFGC NFPA 54/ANSI.

† This length includes an ordinary number of fittings.

Table 3 – Heating Inputs

GAS SUPPLY PRESSURE (IN. W.C.)

Natural{ Propane*{

MANIFOLD PRESSURE

(IN. W.C.)

HEATING INPUT

(BTUH)

NUMBER OF

ORIFICES

Min

4.0

Max

13.0

Min

11.0

Max

13.0

Natural{

3.2∼3.8

Propane*†

10.0∼11.0

40,000

60,000

90,000

115,000

130,000

*When a unit is converted to propane, different size orifices must be used. See separate, natural---to---propane conversion kit instructions.

{Based on altitudes from sea level to 2000 ft (610 m) above sea level. In th e U.S.A. for altitudes above 2000 ft (610 m), reduce input rating 4 percent for each

additional 1000 ft (305 m) above sea level. In Canada, from 2000 ft (610 m) above sea level to 4500 ft (1372 m) above sea level, derate the unit 10 percent.

4. All units must have field--supplied filters or accessory filter

rack installed in the return--air side of the unit.

Recommended sizes for filters are shown in Table 1.

The unit must have

separate electrical service with

field--supplied, waterproof disconnect switch mounted at, or within

sight from, the unit. Refer to the unit rating plate, NEC and local

codes for maximum fuse/circuit breaker size and minimum circuit

amps (ampacity) for wire sizing.

The field--supplied disconnect switch box may be mounted on the

unit over the high--voltage inlet hole when the standard power and

low--voltage entry points are used (See Fig. 2 and 3 for acceptable

location).

5. Size all ductwork for maximum required airflow (either

heating or cooling) for unit being installed. Avoid abrupt

duct size increases or decreases or performance may be

affected.

6. Adequately insulate and weatherproof all ductwork located

outdoors. Insulate ducts passing through unconditioned

space, and use vapor barrier in accordance with latest issue

of Sheet Metal and Air Conditioning Contractors National

Association (SMACNA) and Air Conditioning Contractors

of America (ACCA) minimum installation standards for

heating and air conditioning systems. Secure all ducts to

building structure.

See unit wiring label (Fig. 15 and 16) and Fig. 10 for reference

when making high voltage connections. Proceed as follows to

complete the high--voltage connections to the unit.

Single phase units:

1. Run the high--voltage (L1, L2) and ground lead into the

control box.

7. Flash, weatherproof, and vibration--isolate all openings in

building structure in accordance with local codes and good

building practices.

2. Connect ground lead to chassis ground connection.

3. Locate the black and yellow wires connected to the line side

of the contactor.

Step 10 — Install Electrical Connections

4. Connect field L1 to black wire on connection 11 of the

compressor contactor.

5. Connect field wire L2 to yellow wire on connection 23 of

the compressor contactor.

WARNING

ELECTRICAL SHOCK HAZARD

Three--phase units:

Failure to follow this warning could result in personal injury

or death.

1. Run the high--voltage (L1, L2, L3) and ground lead into the

control box.

The unit cabinet must have an uninterrupted, unbroken

electrical ground. This ground may consist of an electrical

wire connected to the unit ground screw in the control

compartment, or conduit approved for electrical ground when

installed in accordance with NEC, NFPA 70 National Fire

Protection Association (latest edition) (in Canada, Canadian

Electrical Code CSA C22.1) and local electrical codes.

2. Connect ground lead to chassis ground connection.

3. Locate the black and yellow wires connected to the line side

of the contactor.

4. Connect field L1 to black wire on connection 11 of the

compressor contactor.

5. Connect field wire L3 to yellow wire on connection 13 of

the compressor contactor.

6. Connect field wire L2 to blue wire from compressor.

Special Procedures for 208-V Operation

CAUTION

UNIT COMPONENT DAMAGE HAZARD

WARNING

Failure to follow this caution may result in damage to the unit

being installed.

ELECTRICAL SHOCK HAZARD

1. Make all electrical connections in accordance with NEC

NFPA 70 (latest edition) and local electrical codes

governing such wiring. In Canada, all electrical

connections must be in accordance with CSA standard

C22.1 Canadian Electrical Code Part 1 and applicable

local codes. Refer to unit wiring diagram.

2. Use only copper conductor for connections between

field--supplied electrical disconnect switch and unit. DO

NOT USE ALUMINUM WIRE.

Failure to follow this warning could result in personal injury

or death.

Makesurethepower supplyto theunit isswitched OFFbefore

making any wiring changes. Tag the disconnect switch with a

suitable warning label. With disconnect switch open, move

black wire from transformer (3/16 in.) terminal marked 230 to

terminal marked 200. This retaps transformer to primary

voltage of 208 vac.

3. Be sure that high--voltage power to unit is within

operating voltage range indicated on unit rating plate. On

3--phase units, ensure phases are balanced within 2

percent. Consult local power company for correction of

improper voltage and/or phase imbalance.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death.

4. Insulate low--voltage wires for highest voltage contained

within conduit when low--voltage control wires are in

same conduit as high--voltage wires.

Before making any wiring changes, makesure the gas supply

is switched off first. Then switch off the power supply to the

unit and install lockout tag.

5. Do not damage internal components when drilling

through any panel to mount electrical hardware, conduit,

etc.

Control Voltage Connections

Do not use any type of power--stealing thermostat. Unit control

problems may result.

High-Voltage Connections

When routing power leads into unit, use only copper wire between

disconnect and unit. The high voltage leads should be in a conduit

until they enter the duct panel; conduit termination at the duct

panel must be watertight.

Use no. 18 American Wire Gage (AWG) color--coded, insulated

(35_C minimum) wires to make the control voltage connections

between the thermostat and the unit. If the thermostat is located

more than 100 ft (30.5 m) from the unit (as measured along the

control voltage wires), use no. 16 AWG color--coded, insulated

(35_C minimum) wires.

3. Comfort Balance Temperature: When the heat pump is

operating below this point, the indoor supply air feels

uncomfortable (i.e. too cool). This is purely subjective and

will depend on the homeowner’s idea of comfort. Below

this temperature the gas furnace should operate in order to

satisfy the desire for indoor comfort.

Locate the seven (eight on 3--phase) low voltage thermostat leads

in 24 volt splice box. See Fig. 10 for connection diagram. Run the

low--voltage leads from the thermostat, through the control wiring

inlet hole grommet (Fig. 2 and 3), and into the low--voltage splice

box. Provide a drip loop before running wires through panel.

Secure and strain relief all wires so that they do not interfere with

operation of unit. A gray wire is standard on 3--phase unit for

connection to an economizer.

Transformer Protection

The transformer is of the energy--limiting type. It is set to withstand

a 30--sec. overload or shorted secondary condition. If an overload

or short is present, correct overload condition and check for blown

fuse on gas control board or Interface Fan Board. Replace fuse as

required with correct size and rating.

HIGH VOLTAGE

PRE--START--UP

POWER LEADS

POWER

(SEE UNIT WIRING

SUPPLY

LABEL)

WARNING

FIRE,EXPLOSION,ELECTRICAL SHOCKHAZARD

EQUIP GR

FIELD-SUPPLIED

FUSED DISCONNECT

Failure to follow this warning could result in personal injury,

death or property damage.

CONTROL BOX

WHT(W1)

1. Follow recognized safety practices and wear protective

goggles when checking or servicing refrigerant system.

YEL(Y)

GRN(G)

2. Do not operate compressor or provide any electric power

to unit unless compressor terminal cover is in place and

secured.

RED(R)

BRN(C)

ORN(O)

THERMOSTAT

(TYPICAL)

LOW-VOLTAGE

POWER LEADS

(SEE UNIT

WIRING LABEL)

3. Do not remove compressor terminal cover until all

electrical sources are disconnected and tagged.

BLU (DH)

GRA (Y2)

4. Relieve and recover all refrigerant from system before

touching or disturbing anything inside terminal box if

refrigerant leak is suspected around compressor

terminals.

3-Phase

Only

SPLICE BOX

A09067

5. Never attempt to repair soldered connection while

refrigerant system is under pressure.

6. Do not use torch to remove any component. System

contains oil and refrigerant under pressure.

To remove a component, wear protective goggles and

proceed as follows:

Fig. 10 -- High and Control--Voltage Connections

Balance Point Setting-Thermidistat or Hybrid

Thermostat

BALANCE POINT TEMPERATURE--The “balance point”

temperature is a setting which affects the operation of the heating

mode. This is a field--selected input temperature (range 5 to 55_F)

(--15 to 12_C) where the Thermidistat or dual fuel thermostat will

monitor outdoor air temperature and decide whether to enable or

disable the heat pump. If the outdoor temperature is above the

“balance point”, the heat pump will energize first to try to satisfy

the indoor temperature demand. If the heat pump does not make a

sufficient improvement within a reasonable time period (i.e. 15

minutes), then the gas furnace will come on to satisfy the indoor

temperature demand. If the outdoor temperature is below the

“balance point”, the heat pump will not be allowed to operate (i.e.

locked out), and the gas furnace will be used to satisfy the indoor

temperature. There are three separate concepts which are related to

selecting the final “balance point” temperature. Read each of the

following carefully to determine the best “balance point” in a

hybrid installation:

a. Shut off electrical power to unit and install lockout

tag.

b. Relieve and reclaim all refrigerant from system

using both high-- and low--pressure ports.

c. Cut component connecting tubing with tubing

cutter and remove component from unit.

d. Carefully unsweat remaining tubing stubs when

necessary. Oil can ignite when exposed to torch

flame.

Proceed as follows to inspect and prepare the unit for initial

start--up:

1. Remove access panels (see Fig. 19).

2. Read and follow instructions on all WARNING,

CAUTION, and INFORMATION labels attached to, or

shipped with, unit.

1. Capacity Balance Temperature: This is a point where the

heat pump cannot provide sufficient capacity to keep up

with the indoor temperature demand because of declining

outdoor temperature. At or below this point, the furnace is

needed to maintain proper indoor temperature.

3. Make the following inspections:

a. Inspect for shipping and handling damages such as

broken lines, loose parts, disconnected wires, etc.

b. Inspect for oil at all refrigerant tubing connections and

on unit base. Detecting oil generally indicates a

refrigerant leak.

2. Economic Balance Temperature: Above this point, the heat

pump is the most cost efficient to operate, and below this

point the furnace is the most cost efficient to operate. This

can be somewhat complicated to determine and it involves

knowing the cost of gas and electricity, as well as the

efficiency of the furnace and heat pump. For the most

economical operation, the heat pump should operate above

this temperature (assuming it has sufficient capacity) and the

furnace should operate below this temperature.

c. Leak test all refrigerant tubing connections using

electronic leak detector, halide torch, or liquid--soap

solution. If a refrigerant leak is detected, see the Check

for Refrigerant Leaks section.

d. Inspect all field-- and factory--wiring connections. Be

sure that connections are completed and tight.

e. Ensure wires do not touch refrigerant tubing or sharp

sheet metal edges.

f. Inspect coil fins. If damaged during shipping and

handling, carefully straighten fins with a fin comb.

(1.) On a call for heating, terminals “Y” and “G“ of the

Hybrid thermostat are energized. The “Y“ signal is

sent to the Defrost Board (DB) terminal “Y”. The

DB has a built in five minute anti--short cycle timer

which will not allow the compressor to restart

before the time delay has expired.

WARNING

(2.) “T2” energizes the compressor contactor via the

High Pressure Switch (HPS) and Low Pressure

Switch (LPS). The compressor and outdoor fan

start. Thermostat “G” energizes the Interface Fan

Board terminal “G”. The blower motor is energized

through contacts of the IFB.

(3.) When the thermostat removes the “Y” and “G”

calls, the compressor contactor and outdoor fan are

de--energized. The evaporator motor is de--ener-

gized after a 90 sec. delay.

FIRE, EXPLOSION HAZARD

Failure to follow this warning could result in personal injury,

death or property damage.

Do not purge gas supply into the combustion chamber. Do not

use a match or other open flame to check for gas leaks. Use a

commercially available soap solution made specifically for

the detection of leaks to check all connections.

4. Verify the following conditions:

a. Make sure gas line is free of air. Before lighting the unit

for the first time, perform the following with the gas

valve in the “OFF” position:

d. GAS HEATING MODE

Outdoor temperature below balance point setpoint of

thermostat.

NOTE: If the gas supply pipe was not purged before connecting

the unit, it will be full of air. It is recommended that the ground

joint union be loosened, and the supply line be allowed to purge

until the odor of gas is detected. Never purge gas lines into a

combustion chamber. Immediately upon detection of gas odor,

retighten the union. Allow 5 minutes to elapse, then light unit.

Heating Sequence of Operation

(See Fig. 15 and 16 and unit wiring label.)

On a call for heating, terminal W of the thermostat is energized,

starting the induced--draft motor. When the pressure switch senses

that the induced--draft motor is moving sufficient combustion air,

the burner sequence begins. This function is performed by the

integrated gas unit controller (IGC). The indoor (evaporator)--fan

motor is energized 45 sec after flame is established. When the

thermostat is satisfied and W is de--energized, the burners stop

firing and the indoor (evaporator) fan motor shuts off after a

45--sec time--off delay. Please note that the IGC has the capability

to automatically reduce the indoor fan motor on delay and increase

the indoor fan motor off delay in the event of high duct static

and/or partially--clogged filter.

b. Make sure that condenser--fan blade is correctly

positioned in fan orifice. Leading edge of condenser--fan

blade should be 1/2 in. (12 mm) maximum from fan

orifice.

c. Make sure that air filter(s) is in place.

d. Make sure that condensate drain trap is filled with water

to ensure proper drainage.

e. Make sure that all tools and miscellaneous loose parts

have been removed.

NOTE: An LED (light--emitting diode) indicator is provided on

the control board to monitor operation. The control board is

located by removing the burner access panel (see Fig. 19). During

normal operation, the LED is continuously on.

START--UP

Step 1 — Check for Refrigerant Leaks

Proceed as follows to locate and repair a refrigerant leak and to

charge the unit:

Step 3 — Start--up Heating and Make Adjust-

ments

1. Locate leak and make sure that refrigerant system pressure

has been relieved and reclaimed from both high-- and

low--pressure ports.

CAUTION

2. Repair leak following Refrigerant Service procedures.

UNIT COMPONENT DAMAGE HAZARD

NOTE: Install a bi--flow filter drier whenever the system has been

opened for repair.

Failure to follow this caution may result in damage to the unit

being installed.

3. Add a small charge of R--410A refrigerant vapor to system

and leak--test unit.

4. Recover refrigerant from refrigerant system and evacuate to

500 microns if no additional leaks are not found.

Complete the required procedures given in the Pre--Start--Up

section before starting the unit. Do not jumper any safety

devices when operating the unit.

5. Charge unit with Puron (R--410A) refrigerant, using an

electronic scale. Refer to unit rating plate for required

charge.

Complete the required procedures given in the Pre--Start--Up

section before starting the unit. Do not jumper any safety devices

when operating the unit. Make sure that burner orifices are

properly aligned. Unstable operation my occur when the burner

orifices in the manifold are misaligned.

Step 2 — Unit Sequence of Operation

48VT-A Sequence of Operation

a. CONTINUOUS FAN

Follow the lighting instructions on the heating section operation

label (located on the inside of the control access panel) to start the

heating section.

(1.) Thermostat closes circuit R to G energizing the

blower motor for continuous fan.

NOTE: Make sure that gas supply has been purged, and that all

gas piping has been checked for leaks.

b. COOLING MODE

(1.) If indoor temperature is above temperature set

point thermostat closes circuits R to G, R to Y and

R to O--The unit delivers cooling airflow.

c. HEAT PUMP HEATING MODE

Outdoor temperature above balance point setpoint of

thermostat.

specific gravity, or propane gas with a heating value of 2500

Btu/ft at 1.5 specific gravity.

IN THE U.S.A.:

The input rating for altitudes above 2,000 ft (610 m) must be

reduced by 4% for each 1,000 ft (305 m) above see level.

For installations below 2,000 ft (610 m), refer to the unit rating

plate.

For installations above 2,000 ft (610 m) multiply the input by on

the rating plate by the derate multiplier in Table 4 for correct input

rate.

Table 4 – Altitude Derate Multiplier for U.S.A.*

DERATE MULTIPLIER

ALTITUDE FT (M)

PERCENT OF DERATE

FACTOR{

0---2000

(0---610)

1.00

Pipe Plug

Manifold

2001---3000*

(610---914)

8 --- 1 2

0.90

0.86

0.82

0.78

0.74

0.70

0.66

0.62

A07679

Fig. 11 -- Burner Assembly

3001---4000

(315---1219)

12---16

16---20

20---24

24---28

28---32

32---36

36---40

BURNER FLAME

4001---5000

(1220---1524)

5001---6000

(1524---1829)

BURNER

6001---7000

(1829---2134)

7001---8000

(2134---2438)

8001---9000

(2439---2743)

9001---10,000

(2744---3048)

MANIFOLD

* In Canada see Canadian Altitude Adjustment.

{Derate multiplier factors are based on midpoint altitude for altitude range.

IN CANADA:

The input rating for altitudes from 2,000 to 4,500 ft (610 m to

1372 m) above sea level must be derated 10% by an authorized

Gas Conversion Station or Dealer.

C99021

Fig. 12 -- Monoport Burner

EXAMPLE:

Check Heating Control

90,000 Btu/hr Input Furnace Installed at 4300 ft (1311 m).

Start and check the unit for proper heating control operation as

follows (see furnace lighting instructions located on the inside of

the control access panel):

Furnace Input Rate at

Sea Level

Derate Multiplier

Factor

= Furnace Input Rate at

Installation Altitude

90,000

0.90

81,000

1. Place room thermostat SYSTEM switch in the HEAT

position and the fan switch is placed in AUTO position.

2. Set the heating temperature control of the thermostat above

room temperature.

When the gas supply being used has a different heating value or

specific gravity, refer to national and local codes, or contact your

distributor to determine the required orifice size.

3. The induced--draft motor will start.

CAUTION

4. On a call for heating, the main burner should light within 5

sec. of the spark being energized. If the burners do not light,

there is a 22--sec. delay before another 5--sec. try. If the

burners still do not light, this sequence is repeated. If the

burners do not light within 15 minutes from the initial call

for heat, there is a lockout. To reset the control, break the

24--v power to W.

5. The evaporator fan will turn on 45 sec. after the flame has

been established. The evaporator fan will turn off 45 sec.

after the thermostat has been satisfied. Please note that the

integrated gas unit controller (IGC) has the capability to

automatically reduce the evaporator “ON” delay and in-

crease the evaporator “OFF” delay in the event of high duct

static and/or partially--clogged filter.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in reduced unit

and/or component life.

Do Not redrill an orifice. Improper drilling (burrs,

out--of--round holes, etc.) can cause excessive burner noise

and misdirection of burner flame. If orifice hole appears

damaged or it is suspected to have been redrilled, check

orifice hole with a numbered drill bit of correct size.

Adjust Gas Input

The gas input to the unit is determined by measuring the gas flow

at the meter or by measuring the manifold pressure. Measuring the

gas flow at the meter is recommended for natural gas units. The

manifold pressure must be measured to determine the input of

propane gas units.

Check Gas Input

Check gas input and manifold pressure after unit start--up (See

Table 3). If adjustment is required proceed as follows:

Measure Gas Flow (Natural Gas Units)

S The rated gas inputs shown in Table 3 are for altitudes from sea

Minor adjustment to the gas flow can be made by changing the

manifold pressure. The manifold pressure must be maintained

between 3.2 and 3.8 IN. W.C.

level to 2000 ft (610 m) above sea level. These inputs are based

on natural gas with a heating value of 1025 Btu/ft at 0.60

REGULATOR

COVER SCREW

WARNING

PLASTIC

ADJUSTMENT

SCREW

FIRE AND UNIT DAMAGE HAZARD

ON/OFF SWITCH

Failure to follow this warning could result in personal

injury or death and/or property damage.

REGULATOR SPRING

(PROPANE - WHITE)

(

NATURAL - SILVER)

Unsafe operation of the unit may result if manifold pressure

is outside this range.

GAS PRESSURE

REGULATOR

ADJUSTMENT

INLET

PRESSURE TAP

3. Replace regulator cover screw on gas valve (See Fig. 13).

4. Turn off gas supply to unit. Remove manometer from

pressure tap and replace pipe plug on gas valve. (See Fig.

11.) Turn on gas to unit and check for leaks.

Measure Manifold Pressure (Propane Units)

MANIFOLD

PRESSURE TAP

Refer to propane kit installation instructions for properly checking

gas input.

A07751

Fig. 13 -- Single--Stage Gas Valve

If larger adjustments are required, change main burner orifices

following the recommendations of national and local codes.

NOTE: For installations below 2,000 ft (610 m), refer to the unit

rating plate for proper propane conversion kit. For installations

above 2,000 ft (610 m), contact your distributor for proper propane

conversion kit.

NOTE: All other appliances that use the same meter must be

turned off when gas flow is measured at the meter.

Check Burner Flame

Proceed as follows:

With control access panel (see Fig. 19) removed, observe the unit

heating operation. Watch the burner flames to see if they are light

blue and soft in appearance, and that the flames are approximately

the same for each burner. Propane will have blue flame (See Fig.

12). Refer to the Maintenance section for information on burner

removal.

1. Turn off gas supply to unit.

2. Remove pipe plug on manifold (See Fig. 11) and connect

manometer. Turn on gas supply to unit.

3. Record number of seconds for gas meter test dial to make

one revolution.

Normal Operation

4. Divide number of seconds in Step 3 into 3600 (number of

seconds in one hr).

5. Multiply result of Step 4 by the number of cubic feet (cu ft)

shown for one revolution of test dial to obtain cubic feet (cu

ft) of gas flow per hour.

An LED (light--emitting diode) indicator is provided on the

integrated gas unit controller (IGC) to monitor operation. The IGC

is located by removing the control access panel (see Fig. 19).

During normal operation, the LED is continuously on (See Table 5

for error codes).

6. Multiply result of Step 5 by Btu heating value of gas to

obtain total measured input in Btuh. Compare this value

with heating input shown in Table 3 (Consult the local gas

supplier if the heating value of gas is not known).

Airflow and Temperature Rise

The heating section for each size unit is designed and approved for

heating operation within the temperature--rise range stamped on the

unit rating plate.

EXAMPLE: Assume that the size of test dial is 1 cu ft, one

revolution takes 32 sec, and the heating value of the gas is 1050

Table 10 shows the approved temperature rise range for each

heating input, and the air delivery cfm at various temperature rises

for a given external static pressure. The heating operation airflow

must produce a temperature rise that falls within the approved

range.

Btu/ft . Proceed as follows:

1. 32 sec. to complete one revolution.

2. 3600 ÷ 32 = 112.5.

3. 112.5 x 1 =112.5 ft of gas flow/hr.

4. 112.5 x 1050 = 118,125 Btuh input.

Refer to Indoor Airflow and Airflow Adjustments section to adjust

heating airflow when required.

If the desired gas input is 115,000 Btuh, only a minor change in the

manifold pressure is required.

Limit Switches

Normally closed limit switch (LS) completes the control circuit.

Should the leaving--air temperature rise above the maximum

allowable temperature, the limit switch opens and the control

circuit “breaks.” Any interruption in the control circuit instantly

closes the gas valve and stops gas flow to the burners and pilot.

The blower motor continues to run until LS resets.

Observe manifold pressure and proceed as follows to adjust gas

input:

1. Remove regulator cover screw over plastic adjustment

screw on gas valve (See Fig. 13).

2. Turn plastic adjustment screw clockwise to increase gas

input, or turn plastic adjustment screw counterclockwise to

decrease input (See Fig. 13). Manifold pressure must be

between 3.2 and 3.8 IN. W.C.

When the air temperature at the limit switch drops to the

low--temperature setting of the limit switch, the switch closes and

completes the control circuit. The direct--spark ignition system

cycles and the unit returns to normal heating operation.

NOTE: Adjustment of the refrigerant charge is not required unless

the unit is suspected of not having the proper PuronR (R--410A)

charge.

Table 5 – LED Indications

The charging label and the tables shown refer to system

temperatures and pressures in cooling mode only. A refrigerant

charging label is attached to the inside of the compressor access

panel (see Fig. 19). The chart includes the required liquid line

temperature at given discharge line pressures and outdoor ambient

temperatures.

STATUS CODE

Normal Operation

LED INDICATION

No Power Hardware Failure

Limit Switch Fault

Off

2 Flashes

3 Flashes

4 Flashes

5 Flashes

6 Flashes

7 Flashes

8 Flashes

9 Flashes

Flame Sense Fault

An accurate thermocouple-- or thermistor--type thermometer, and a

gauge manifold are required when using the subcooling charging

method for evaluating the unit charge. Do not use mercury or small

dial--type thermometers because they are not adequate for this type

of measurement.

Four Consecutive Limit Switch Faults

Ignition Lockout Fault

Pressure Switch Fault

Rollout Switch Fault

Internal Control Fault

Temporary 1 hr auto reset

NOTES:

CAUTION

1.This code indicates an internal processor fault that will reset itself in one

hr. Fault can be caused by stray RF signals in the structure or nearby. This

is a UL requirement.

UNIT DAMAGE HAZARD

2. LED indicates acceptable operation. Do not change ignition control

board.

3. When W is energized the burners will remain on for a minimum of 60 sec.

4. If more than one error mode exists they will be displayed on the LED in

sequence.

Failure to follow this caution may result in unit damage.

When evaluating the refrigerant charge, an indicated

adjustment to the specified factory charge must always be

very minimal. If a substantial adjustment is indicated, an

abnormal condition exists somewhere in the cooling system,

such as insufficient airflow across either coil or both coils.

Rollout Switch

The function of the rollout switch is to close the main gas valve in

the event of flame rollout. The switch is located above the main

burners. When the temperature at the rollout switch reaches the

maximum allowable temperature, the control circuit trips, closing

the gas valve and stopping gas flow to the burners. The indoor

(evaporator) fan motor (IFM) and induced draft motor continue to

run until switch is reset. The IGC LED will display FAULT CODE

Proceed as follows:

1. Remove caps from low-- and high--pressure service fittings.

2. Using hoses with valve core depressors, attach low-- and

high--pressure gauge hoses to low-- and high--pressure

service fittings, respectively.

3. Start unit in Cooling Mode and let unit run until system

pressures stabilize.

Step 4 — Start--up Cooling and Make Adjust-

ments

Complete the required procedures given in the Pre--Start--Up

section before starting the unit. Do not jumper any safety devices

when operating the unit. Do not operate the compressor when the

outdoor temperature is below 40°F (4.4°C) (unless accessory

low--ambient kit is installed). Do not rapid--cycle the compressor.

Allow 5 minutes between on cycles to prevent compressor damage.

4. Measure and record the following:

a. Outdoor ambient--air temperature (°F (°C) db).

b. Liquid line temperature (°F (°C).

c. Discharge (high--side) pressure (psig).

d. Suction (low--side) pressure (psig) (for reference only).

5. Using “Cooling Charging Charts,” compare outdoor--air

temperature(°F (°C) db) with the discharge line pressure

(psig) to determine desired system operating liquid line

temperature (See Fig. 17).

6. Compare actual liquid line temperature with desired liquid

line temperature. Using a tolerance of ± 2°F (±1.1°C), add

refrigerant if actual temperature is more than 2°F (1.1°C)

higher than proper liquid line temperature, or remove

refrigerant if actual temperature is more than 2°F (1.1°C)

lower than required liquid line temperature.

Checking Cooling Control Operation

Start and check the unit for proper cooling control operation as

follows:

1. Place room thermostat SYSTEM switch in OFF position.

Observe that blower motor starts when FAN switch is

placed in ON position and shuts down when FAN switch is

placed in AUTO position.

2. Place SYSTEM switch in COOL position and FAN switch

in AUTO position. Set cooling control below room

temperature. Observe that compressor, condenser fan, and

evaporator blower motors start. Observe that cooling cycle

shuts down when control setting is satisfied. The evaporator

fan will continue to run for 90 sec.

NOTE: If the problem causing the inaccurate readings is a

refrigerant leak, refer to the Check for Refrigerant Leaks section.

Indoor Airflow and Airflow Adjustments

CAUTION

IMPORTANT:

Three--phase, scroll compressors units are

direction oriented. Unit must be checked to ensure proper

compressor 3--phase power lead orientation. If not corrected within

5 minutes, the internal protector will shut off the compressor. The

3--phase power leads to the unit must be reversed to correct

rotation. When turning backwards, the difference between

compressor suction and discharge pressures will be near zero.

UNIT OPERATION HAZARD

Failure to follow this caution may result in unit damage.

For cooling operation, the recommended airflow is 350 to

450 cfm for each 12,000 Btuh of rated cooling capacity. For

heating operation, the airflow must produce a temperature

rise that falls within the range stamped on the unit rating

plate.

Checking and Adjusting Refrigerant Charge

The refrigerant system is fully charged with PuronR (R--410A)

refrigerant and is tested and factory sealed. Allow system to operate

a minimum of 15 minutes before checking or adjusting charge.

NOTE: Be sure that all supply--and return--air grilles are open,

free from obstructions, and adjusted properly.

3. Connect the desired speed tap wire to the “LOW” terminal

on the interface fan board (IFB).

WARNING

Two Cooling Fan Speeds Set-up (Dehumidification

feature used)

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

IMPORTANT: Dehumidification control must open control

circuit on humidity rise above set point.

Before making any indoor wiring adjustments, shut off gas

supply. Then disconnect electrical power to the unit and

install lockout tag before changing blower speed.

Use of the dehumidification cooling fan speed requires use of

either a 24 VAC dehumidistat or a thermostat which includes

control of a 24 VAC dehumidistat connection. In either case, the

dehumidification control must open the control circuit on humidity

rise above the dehumidification set point. Dehumidification

controls are available with the reverse logic; these must not be

used.

This unit has independent fan speeds for gas heating and cooling.

In addition, this unit has the field-selectable capability to run two

different cooling fan speeds: A normal cooling fan speed (350~400

CFM/Ton) and an enhanced dehumidification fan speed (As low as

320 CFM/Ton) for use with either a dehumidistat or a thermostat

that supports dehumidification.

1. Remove fan speed tap wire from the “LOW” terminal on

the interface fan board (IFB) (Fig. 14).

2. Determine correct normal cooling fan speed for unit and

application. Add the wet coil pressure drop in Table 8 to

the system static to determine the correct cooling airflow

speed in Table 10 that will deliver the nominal cooling

airflow as listed in Table 1 for each size.

3. Remove the vinyl cap off of the desired speed tap wire

(Refer to Table 6 for color coding) for the normal cooling

fan speed and place desired speed tap wire on “HIGH” on

the interface board.

This unit is factory-set up for use with a single cooling fan speed.

The cooling speed is marked “LOW” on the interface fan board

(IFB) (Fig. 14) . The factory-shipped settings are noted in Table

10. There are 3 additional speed tap wires available for use in

either gas heating or cooling (For color coding on the indoor fan

motor leads, see Table 6). The additional 3 speed tap wires are

shipped loose with vinyl caps and are located in the control box,

near the interface fan board (IFB) (Fig. 14).

4. Refer to airflow tables (Table 10) to determine allowable

speeds for the dehumidification cooling fan speed. In Table

10, speeds that are not allowed for dehumidification cooling

are shaded.

5. Remove the vinyl cap off of the desired speed tap wire

(Refer to Table 6 for color coding) for the dehumidification

cooling fan speed and place desired speed tap wire on the

“LOW” connection on the interface board (IFB). Verify

that static pressure is in the acceptable range for the speed

tap to be used for dehumidification cooling.

Gas Heating Fan Speed Set-up

To change the gas heating speed:

1. Remove the vinyl cap off of the desired speed tap wire

(Refer to Table 6 for color coding). Table 10 shows the

temperature rise associated with each fan speed for a given

static pressure. Make sure that the speed chosen delivers a

temperature rise within the rise range listed on the unit

rating plate.

2. Remove the current speed tap wire from the “GAS HEAT”

terminal on the interface fan board (IFB) (Fig.14) and place

vinyl cap over the connector on the wire.

3. Connect the desired speed tap wire to the “GAS HEAT”

terminal on the interface fan board (IFB).

6. Use any spare vinyl plugs to cap any unused speed tap

wires.

NOTE: For heat pump operation, the recommended airflow is 350

to 450 CFM for each 12,000 Btuh of rated cooling capacity.

Single Cooling Fan Speed Set-up (Dehumidification

feature not used)

To change cooling speed:

Continuous Fan Operation

When the DEHUM feature is not used, the continuous fan speed

will be the same as cooling fan speed. When the DEHUM feature

is used, the continuous fan will operate on IFB “LOW” speed

when the DH control lead is not energized, or IFB “HIGH” speed

when the DH lead is energized (see Fig. 14).

1. Remove the vinyl cap off of the desired speed tap wire

(Refer to Table 6 for color coding). Add the wet coil

pressure drop in Table 8 to the system static to determine the

correct cooling airflow speed in Table 10 that will deliver

the nominal cooling airflow as listed in Table 1 for each

size.

2. Remove the current speed tap wire from the “LOW”

terminal on the interface fan board (IFB) (Fig. 14) and place

vinyl cap over the connector on the wire.

Table 6 – Color Coding for Indoor Fan Motor Leads

Black = High Speed

Orange = Med---High Speed

Red = Med Speed

Pin k = Med --- L ow Speed

Blue = Low Speed

GAS

HEAT

HIGH

QC7

LOW

QC4

COM

QC3

QC6

DCR

QCR

QC1

RL3 C8 R1L

RI0

JM6

RI2

RI DL

JM5

OILL C2 D6 D4

R9 AB A15

RL4

D5 D3

JW3

R3 R5

P2^R6

QCB

JW7

JW2

JW4

24VAC

JW1

SSTZ-8

Y2/

Y1/

A09058

Fig. 14 -- Interface Fan Board (IFB)

Table 7 – Filter Pressure Drop Table (IN. W.C.)

CFM

FILTER SIZE

in. (mm)

500

600

700

800

900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300

20X20X1

0.05 0.07 0.08

0.1

0.12 0.13 0.14 0.15

0.09 0.10 0.11 0.13 0.14 0.15 0.16

0.1

—

(508X508X25)

20X24X1

(508X610x25 )

24X30X1

(610X762x25)

24X36X1

(610X914X25)

—

0.04 0.05 0.06 0.07 0.07 0.08 0.09

—

0.06 0.07 0.07 0.08 0.09 0.09 0.10 0.11 0.12 0.13 0.14 0.14

Table 8 – 48VT--A Wet Coil Pressure Drop

Standard CFM (S.C.F.M)

Unit Size

500

600

0.06

700

0.07

800

0.08

0.12

900

0.09

0.15

1000

0.1

0.19

0.07

1100

1200

1300

1400

1500

1600

1700

1800

1900

2000

0.23

0.11

0.27

0.18

0.04

0.26

0.07

0.35

0.1

0.11

0.15

0.14

0.21

0.17

0.1

0.22

0.17

0.28

0.23

0.31

0.36

Table 9 – Wet Coil Air Delivery - Downflow -- High Speed with 1--in. Filter and Economizer

EXTERNAL STATIC PRESSURE (in. W.C.)

UNIT SIZE

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

36, 42

1612

2298

2000

1569

2239

1926

1527

2180

1825

1481

2110

1820

1451

2044

1759

1393

1951

1705

1351

1862

1634

1317

1777

1496

1278

1697

1412

1242

1591

1328

Table 10 – Dry Coil Air Delivery* -- Horizontal and Downflow Discharge -- Unit 48VT--A24--60

HEATING

RISE

EXTERNAL STATIC PRESSURE (in. W.C.)

MOTOR

SPEED

WIRE

UNIT

COLOR

0.1

741

0.2

638

0.3

0.4

0.5

0.6

0.7

0.8

---

0.9

---

RANGE

CFM

547

415

---

Heating

Rise ( F)

Low

Blue

Pink

Heating

898

820

738

662

536

---

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Heating

973

887

823

733

665

538

451

---

Rise ( C)

CFM

Heating

30 - 60 F

Rise ( F)

48VT(-,N)A24040

Medium

Med-High

High

Red

(17 - 33 C)

Heating

1140

1064

996

915

840

758

687

564

480

Rise ( C)

CFM

Heating

Rise ( F)

Orange

Black

Blue

Heating

1202

1140

1082

1015

961

881

810

732

631

Rise ( C)

CFM

Heating

Rise ( F)

Heating

741

638

547

415

---

Rise ( C)

CFM

Heating

Rise ( F)

Low

Heating

898

820

738

662

536

---

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Medium

Pink

Heating

973

887

823

733

665

538

451

---

Rise ( C)

CFM

Heating

25 - 55 F

Rise ( F)

48VT(-,N)A24060

Red

(14 - 31 C)

Heating

1140

1064

996

915

840

758

687

564

480

Rise ( C)

CFM

Heating

Rise ( F)

Med-High

Orange

Black

Blue

Heating

1202

1140

1082

1015

961

881

810

732

631

Rise ( C)

CFM

Heating

Rise ( F)

High

Heating

741

638

547

415

---

Rise ( C)

CFM

Heating

Rise ( F)

Low

Heating

898

820

738

662

536

---

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Pink

Heating

973

887

823

733

665

538

451

---

Rise ( C)

CFM

Heating

30 - 60 F

Rise ( F)

48VT(-,N)A30040

Medium

Red

(17 - 33 C)

Heating

1140

1064

996

915

840

758

687

564

480

Rise ( C)

CFM

Heating

Rise ( F)

Med-High

High

Orange

Black

Heating

1202

1140

1082

1015

961

881

810

732

631

Rise ( C)

CFM

Heating

Rise ( F)

Heating

Rise ( C)

Table 10 -- Dry Coil Air Delivery* -- Horizontal and Downflow Discharge -- Unit 48VT--A24--60 Cont

HEATING

RISE

EXTERNAL STATIC PRESSURE (in. W.C.)

MOTOR

SPEED

WIRE

UNIT

COLOR

0.1

741

0.2

638

0.3

547

0.4

415

0.5

---

0.6

---

0.7

---

0.8

---

0.9

---

RANGE

CFM

Heating

Rise ( F)

Low

Blue

Pink

Heating

898

820

738

662

536

---

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Medium

Heating

973

887

823

733

665

538

451

---

Rise ( C)

CFM

Heating

25 - 55 F

Rise ( F)

48VT(-,N)A30060

Red

(14 - 31 C)

Heating

1140

1064

996

915

840

758

687

564

480

Rise ( C)

CFM

Heating

Rise ( F)

Med-High

Orange

Black

Blue

Heating

1202

1140

1082

1015

961

881

810

732

631

Rise ( C)

CFM

Heating

Rise ( F)

High

Heating

1295

1234

1182

1126

1075

1016

955

898

857

Rise ( C)

CFM

Heating

Rise ( F)

Low

Heating

1345

1282

1235

1194

1140

1095

1027

974

921

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Medium

Pink

Heating

1505

1452

1413

1358

1323

1282

1234

1169

1130

Rise ( C)

CFM

Heating

25 - 55 F

Rise ( F)

48VT(-,N)A36060

Red

(14 - 31 C)

Heating

1545

1492

1449

1411

1362

1313

1278

1231

1188

Rise ( C)

CFM

Heating

Rise ( F)

Med-High

High

Orange

Black

Blue

Heating

1705

1643

1607

1568

1518

1483

1448

1404

1360

Rise ( C)

CFM

Heating

Rise ( F)

Heating

1295

1234

1182

1126

1075

1016

955

898

857

Rise ( C)

CFM

Heating

Rise ( F)

Low

Heating

1345

1282

1235

1194

1140

1095

1027

974

921

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Pink

Heating

1505

1452

1413

1358

1323

1282

1234

1169

1130

Rise ( C)

CFM

Heating

35 - 65 F

Rise ( F)

48VT(-,N)A36090

Medium

Red

(19 - 36 C)

Heating

1545

1492

1449

1411

1362

1313

1278

1231

1188

Rise ( C)

CFM

Heating

Rise ( F)

Med-High

High

Orange

Black

Heating

1705

1643

1607

1568

1518

1483

1448

1404

1360

Rise ( C)

CFM

Heating

Rise ( F)

Heating

Rise ( C)

Table 10 -- Dry Coil Air Delivery* -- Horizontal and Downflow Discharge -- Unit 48VT--A24--60 Cont

HEATING

RISE

EXTERNAL STATIC PRESSURE (in. W.C.)

MOTOR

SPEED

WIRE

UNIT

COLOR

0.1

1295

0.2

1234

0.3

1182

0.4

1126

0.5

1075

0.6

1016

0.7

955

0.8

898

0.9

857

RANGE

CFM

Heating

Rise ( F)

Low

Blue

Pink

Heating

1345

1282

1235

1194

1140

1095

1027

974

921

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Medium

Heating

1505

1452

1413

1358

1323

1282

1234

1169

1130

Rise ( C)

CFM

Heating

25 - 55 F

Rise ( F)

48VT(-,N)A42060

Red

(14 - 31 C)

Heating

1545

1492

1449

1411

1362

1313

1278

1231

1188

Rise ( C)

CFM

Heating

Rise ( F)

Med-High

High

Orange

Black

Blue

Heating

1705

1643

1607

1568

1518

1483

1448

1404

1360

Rise ( C)

CFM

Heating

Rise ( F)

Heating

1295

1234

1182

1126

1075

1016

955

898

857

Rise ( C)

CFM

Heating

Rise ( F)

Low

Heating

1345

1282

1235

1194

1140

1095

1027

974

921

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Pink

Heating

1505

1452

1413

1358

1323

1282

1234

1169

1130

Rise ( C)

CFM

Heating

35 - 65 F

Rise ( F)

48VT(-,N)A42090

Medium

Red

(19 - 36 C)

Heating

1545

1492

1449

1411

1362

1313

1278

1231

1188

Rise ( C)

CFM

Heating

Rise ( F)

Med-High

High

Orange

Black

Blue

Heating

1705

1643

1607

1568

1518

1483

1448

1404

1360

Rise ( C)

CFM

Heating

Rise ( F)

Heating

1445

1389

1341

1281

1236

1189

1139

1072

1027

Rise ( C)

CFM

Heating

Rise ( F)

Low

Heating

1678

1635

1602

1558

1513

1474

1438

1404

1349

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Medium

Med-High

High

Pink

Heating

1962

1915

1880

1843

1794

1753

1711

1675

1628

Rise ( C)

CFM

Heating

35 - 65 F

Rise ( F)

48VT(-,N)A48090

Red

(19 - 36 C)

Heating

2131

2088

2065

2013

1982

1941

1888

1860

1785

Rise ( C)

CFM

Heating

Rise ( F)

Orange

Black

Heating

2461

2409

2339

2286

2192

2140

2062

1968

1874

Rise ( C)

CFM

Heating

Rise ( F)

Heating

Rise ( C)

Table 10 -- Dry Coil Air Delivery* -- Horizontal and Downflow Discharge -- Unit 48VT--A24--60 Cont

HEATING

RISE

EXTERNAL STATIC PRESSURE (in. W.C.)

MOTOR

SPEED

WIRE

UNIT

COLOR

0.1

1445

0.2

1389

0.3

1341

0.4

1281

0.5

1236

0.6

1189

0.7

1139

0.8

1072

0.9

1027

RANGE

CFM

Heating

Rise ( F)

Low

Blue

Pink

Heating

1678

1635

1602

1558

1513

1474

1438

1404

1349

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Medium

Med-High

High

Heating

1962

1915

1880

1843

1794

1753

1711

1675

1628

Rise ( C)

CFM

Heating

30 - 60 F

Rise ( F)

48VT(-,N)A48115

Red

(17 - 33 C)

Heating

2131

2088

2065

2013

1982

1941

1888

1860

1785

Rise ( C)

CFM

Heating

Rise ( F)

Orange

Black

Blue

Heating

2461

2409

2339

2286

2192

2140

2062

1968

1874

Rise ( C)

CFM

Heating

Rise ( F)

Heating

1445

1389

1341

1281

1236

1189

1139

1072

1027

Rise ( C)

CFM

Heating

Rise ( F)

Low

Heating

1678

1635

1602

1558

1513

1474

1438

1404

1349

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Medium

Med-High

High

Pink

Heating

1962

1915

1880

1843

1794

1753

1711

1675

1628

Rise ( C)

CFM

Heating

35 - 65 F

Rise ( F)

48VT(-,N)A48130

Red

(19 - 36 C)

Heating

2131

2088

2065

2013

1982

1941

1888

1860

1785

Rise ( C)

CFM

Heating

Rise ( F)

Orange

Black

Blue

Heating

2461

2409

2339

2286

2192

2140

2062

1968

1874

Rise ( C)

CFM

Heating

Rise ( F)

Heating

1448

1362

1296

1226

1168

1108

1071

998

905

Rise ( C)

CFM

Heating

Rise ( F)

Low

Heating

1722

1675

1614

1543

1499

1442

1408

1356

1308

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Pink

Heating

1887

1847

1783

1726

1677

1625

1578

1527

1432

Rise ( C)

CFM

Heating

35 - 65 F

Rise ( F)

48VT(-,N)A60090

Medium

Red

(19 - 36 C)

Heating

2055

2008

1958

1927

1900

1768

1685

1581

1458

Rise ( C)

CFM

Heating

Rise ( F)

Med-High

High

Orange

Black

Heating

2292

2238

2158

2049

1935

1840

1732

1635

1513

Rise ( C)

CFM

Heating

Rise ( F)

Heating

Rise ( C)

Table 10 -- Dry Coil Air Delivery* -- Horizontal and Downflow Discharge -- Unit 48VT--A24--60 Cont

HEATING

RISE

EXTERNAL STATIC PRESSURE (in. W.C.)

MOTOR

SPEED

WIRE

UNIT

COLOR

0.1

1448

0.2

1362

0.3

1296

0.4

1226

0.5

1168

0.6

1108

0.7

1071

0.8

998

0.9

905

RANGE

CFM

Heating

Rise ( F)

Low

Blue

Pink

Heating

1722

1675

1614

1543

1499

1442

1408

1356

1308

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Heating

1887

1847

1783

1726

1677

1625

1578

1527

1432

Rise ( C)

CFM

Heating

30 - 60 F

Rise ( F)

48VT(-,N)A60115

Medium

Red

(17 - 33 C)

Heating

2055

2008

1958

1927

1900

1768

1685

1581

1458

Rise ( C)

CFM

Heating

Rise ( F)

Med-High

High

Orange

Black

Blue

Heating

2292

2238

2158

2049

1935

1840

1732

1635

1513

Rise ( C)

CFM

Heating

Rise ( F)

Heating

1448

1321

1282

1235

1192

1145

1101

1057

1011

Rise ( C)

CFM

Heating

Rise ( F)

Low

Heating

1722

1675

1614

1543

1499

1442

1408

1356

1308

Rise ( C)

CFM

Heating

Rise ( F)

Med-Low

Pink

Heating

1887

1847

1783

1726

1677

1625

1578

1527

1432

Rise ( C)

CFM

Heating

35 - 65 F

Rise ( F)

48VT(-,N)A60130

Medium

Red

(19 - 36 C)

Heating

2055

2008

1958

1927

1900

1768

1685

1581

1458

Rise ( C)

CFM

Heating

Rise ( F)

Med-High

High

Orange

Black

Heating

2292

2238

2158

2049

1935

1840

1732

1635

1513

Rise ( C)

CFM

Heating

Rise ( F)

Heating

Rise ( C)

* Air delivery values are without air filter and are for dry coil (See 48VT---A Wet Coil Pressure Drop table).

Factory---shipped gas heating speed

Factory---shipped heat pump speed

NA --- Not allowed for heating speed

Note: Deduct field---supplied air filter pressure drop and wet coil pressure drop to obtain external static pressure available for ducting.

Shaded areas indicate speed/static combinations that are not permitted for dehumidification speed.

A09068

Fig. 15 -- 208/230--1--60 Wiring Diagram, Unit 48VT--A

A09209

Fig. 16 -- 208/230--3--60 Wiring Diagram, Unit 48VT--A

A09099

Fig. 17 -- Cooling Charging Table--Subcooling

5. Check and inspect heating section before each heating

season. Clean and adjust when necessary.

6. Check flue hood and remove any obstructions, if necessary.

MAINTENANCE

To ensure continuing high performance and to minimize the

possibility of premature equipment failure, periodic maintenance

must be performed on this equipment. This combination

heating/cooling unit should be inspected at least once each year by

a qualified service person. To troubleshoot cooling or heating of

units, refer to Tables 10, 11 and 12.

Air Filter

IMPORTANT: Never operate the unit without a suitable air filter

in the return--air duct system. Always replace the filter with the

same dimensional size and type as originally installed. (See Table 1

for recommended filter sizes.)

NOTE: Consult your local dealer about the availability of a

maintenance contract.

Inspect air filter(s) at least once each month and replace

(throwaway--type) or clean (cleanable--type) at least twice during

each heating and cooling season or whenever the filter(s) becomes

clogged with dust and/or lint.

WARNING

PERSONAL INJURY AND UNIT DAMAGE HAZARD

Indoor Blower and Motor

NOTE: All motors are prelubricated. Do not attempt to lubricate

these motors.

Failure to follow this warning could result in personal injury

or death and unit component damage.

The ability to properly perform maintenance on this

equipment requires certain expertise, mechanical skills, tools

and equipment. If you do not possess these, do not attempt to

perform any maintenance on this equipment, other than those

procedures recommended in the Owner’s Manual.

For longer life, operating economy, and continuing efficiency,

clean accumulated dirt and grease from the blower wheel and

motor annually.

WARNING

ELECTRICAL SHOCK HAZARD

WARNING

Failure to follow this warning could result in personal injury

or death.

ELECTRICAL SHOCK HAZARD

Failure to follow these warnings could result in personal

injury or death:

Disconnect and tag electrical powerto theunit beforecleaning

the blower motor and wheel.

1. Turn off electrical power to the unit and install a lockout

tag before performing any maintenance or service on this

unit.

Cleaning the Blower Motor and Wheel

1. Remove and disassemble blower assembly as follows:

a. Remove blower access panel (see Fig. 19).

b. Disconnect 5 pin plug and 4 pin plug from indoor

blower motor. Remove capacitor if required.

c. On all units, remove blower assembly from unit.

Remove screws securing blower to blower partition and

slide assembly out. Be careful not to tear insulation in

blower compartment.

2. Use extreme caution when removing panels and parts.

3. Never place anything combustible either on or in contact

with the unit.

4. Should overheating occur or the gas supply fail to shut

off, turn off external main manual gas valve to the unit.

Then shut off electrical supply.

d. Ensure proper reassembly by marking blower wheel and

motor in relation to blower housing before disassembly.

e. Loosen setscrew(s) that secures wheel to motor shaft.

Remove screws that secure motor mount brackets to

housing, and slide motor and motor mount out of

housing.

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in improper

operation.

2. Remove and clean blower wheel as follows:

a. Ensure proper reassembly by marking wheel orientation.

Errors made when reconnecting wires may cause improper

and dangerous operation. Label all wires prior to

disconnecting when servicing.

b. Lift wheel from housing. When handling and/or

cleaning blower wheel, be sure not to disturb balance

weights (clips) on blower wheel vanes.

The minimum maintenance requirements for this equipment are as

follows:

c. Remove caked--on dirt from wheel and housing with a

brush. Remove lint and/or dirt accumulations from

wheel and housing with vacuum cleaner, using soft

brush attachment. Remove grease and oil with mild

solvent.

1. Inspect air filter(s) each month. Clean or replace when

necessary. Certain geographical locations may require more

frequent inspections.

2. Inspect indoor coil, outdoor coil, drain pan, and condensate

drain each cooling season for cleanliness. Clean when

necessary.

d. Reassemble wheel into housing.

e. Reassemble motor into housing. Be sure setscrews are

tightened on motor shaft flats and not on round part of

shaft. Reinstall blower into unit. Reinstall capacitor.

3. Inspect blower motor and wheel for cleanliness at the

beginning of each heating and cooling season. Clean when

necessary. For first heating and cooling season, inspect

blower wheel bi--monthly to determine proper cleaning

frequency.

f. Connect 5 pin plug and 4 pin plug to indoor blower

motor.

g. Reinstall blower access panel (see Fig. 19).

3. Restore electrical power to unit. Start unit and check for

proper blower rotation and motor speeds during heating and

cooling cycles.

4. Check electrical connections for tightness and controls for

proper operation each heating and cooling season. Service

when necessary. Ensure electrical wiring is not in contact

with refrigerant tubing or sharp metal edges.

directions in the Induced Draft Blower Assembly section.

Integrated

Gas Unit

Controller

(IGC)

2. Remove the 11 screws holding the flue collector box cover

(See Fig. 18) to the heat exchanger assembly. Inspect the

heat exchangers.

Auto Transformer

fuses used on 460

volt units only.

(Hidden)

3. Clean all surfaces, as required, using a wire brush.

Limit Switch

Interface Fan

Board (IFB)

Remove blower access panel (see Fig. 19). Limit switch is located

on the fan partition.

Induced Draft

Motor

Burner Ignition

Unit is equipped with a direct spark ignition 100 percent lockout

system. Ignition module (IGC) is located in the control box (See

Fan Partition

Mounting

Bracket

Flue

Collector

Box

Rollout

Switch

Inducer

Blower

Housing

Burner

Rack

Mounting

Screw

Fig. 18). Module contains

self--diagnostic LED. During

servicing, refer to label diagram or Table 5 in these instructions for

LED interpretation.

A09199

Fig. 18 -- Blower Housing and Flue Collector Box

If lockout occurs, unit may be reset by either momentarily

interrupting power supply to unit or by turning selector switch to

OFF position at the thermostat.

Main Burners

At the beginning of each heating season, inspect for deterioration

or blockage due to corrosion or other causes. Observe the main

burner flames and adjust, if necessary.

Removal of Gas Train

To remove the gas train for servicing:

1. Shut off main gas valve.

2. Shut off power to unit and install lockout tag.

3. Remove control access panel (See Fig. 19).

4. Disconnect gas piping at unit gas valve.

5. Remove fan partition mounting bracket (2 screws located

on the left side of control compartment on the fan partition

panel). Slide bracket forward, bottom first to remove. (See

Fig. 18).

Control

Access

Panel

Blower

Access

Panel

Compressor

Access Panel

6. Remove wires connected to gas valve. Mark each wire.

7. Remove ignitor and sensor wires at the ignitor module.

A09210

8. Remove the mounting screw that attaches the burner rack to

the unit base (See Fig. 18).

Fig. 19 -- Unit Access Panels

Induced Draft (combustion air) Blower Assembly

The induced--draft blower assembly consists of the inducer motor,

the blower housing, and the induced--draft blower wheel.

Clean periodically to assure proper airflow and heating efficiency.

Inspect blower wheel every fall and periodically during the heating

season. For the first heating season, inspect blower wheel

bimonthly to determine proper cleaning frequency.

To inspect blower wheel, remove draft hood assembly. Shine a

flashlight into opening to inspect wheel. If cleaning is required,

remove induced--draft blower assembly as follows:

9. Slide the burner rack out of the unit (See Fig. 18 and 21).

10. To reinstall, reverse the procedure outlined above.

Outdoor Coil, Indoor Coil, and Condensate Drain Pan

Inspect the outdoor coil, indoor coil, and condensate drain pan at

least once each year. The coils are easily cleaned when dry;

therefore, inspect and clean the coils either before or after each

cooling season. Remove all obstructions, including weeds and

shrubs, that interfere with the airflow through the condenser coil.

Straighten bent fins with a fin comb. If coated with dirt or lint,

clean the coils with a vacuum cleaner, using the soft brush

attachment. Be careful not to bend the fins. If coated with oil or

grease, clean the coils with a mild detergent--and--water solution.

Rinse coils with clear water, using a garden hose. Be careful not to

splash water on motors, insulation, wiring, or air filter(s). For best

results, spray outdoor coil fins from inside to outside the unit. On

units with an outer and inner condenser coil, be sure to clean

between the coils. Be sure to flush all dirt and debris from the unit

base.

Inspect the drain pan and condensate drain line when inspecting

the coils. Clean the drain pan and condensate drain by removing all

foreign matter from the pan. Flush the pan and drain tube with

clear water. Do not splash water on the insulation, motor, wiring, or

air filter(s). If the drain tube is restricted, clear it with a “plumbers

snake” or similar probe device. Ensure that the auxiliary drain port

above the drain tube is also clear.

1. Remove control access panel (See Fig. 19).

2. Remove the 5 screws that attach induced--draft blower as-

sembly to the flue collector box cover.

3. Slide the assembly out of the unit. (See Fig. 20). Clean the

blower wheel. If additional cleaning is required, continue

with Steps 4 and 5.

4. To remove blower wheel, remove 2 setscrews.

5. To remove inducer motor, remove screws that hold the

inducer motor to the blower housing.

6. To reinstall, reverse the procedure outlined above.

Flue Gas Passageways

To inspect the flue collector box and upper areas of the heat

exchanger:

1. Remove the induced draft blower assembly according to

Outdoor Fan

BLOWER

HOUSING

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in damage to unit

components.

Keep the outdoor fan free from all obstructions to ensure

proper cooling operation. Never place articles on top of the

unit.

1. Remove 6 screws holding outdoor grille and motor to top

cover.

2 SETSCREWS

(HIDDEN)

2. Turn motor/grille assembly upside down on top cover to

expose the fan blade.

3. Inspect the fan blades for cracks or bends.

4. If fan needs to be removed, loosen the setscrew and slide the

fan off the motor shaft.

5. When replacing fan blade, position blade back to the same

position as before.

C99085

6. Ensure that setscrew engages the flat area on the motor shaft

when tightening.

Fig. 20 -- Removal of Motor and Blower Wheel

7. Replace grille.

Electrical Controls and Wiring

Inspect and check the electrical controls and wiring annually. Be

sure to turn off the gas supply, and then the electrical power to the

unit.

Remove access panels (see Fig. 19) to locate all the electrical

controls and wiring. Check all electrical connections for tightness.

Tighten all screw connections. If any discolored or burned

connections are noticed, disassemble the connection, clean all the

parts, re--strip the wire end and reassemble the connection properly

and securely.

After inspecting the electrical controls and wiring, replace the

access panels (see Fig. 19). Start the unit, and observe at least one

complete heating cycle and one complete cooling cycle to ensure

proper operation. If discrepancies are observed in any operating

cycle, or if a suspected malfunction has occurred, check each

electrical component with the proper electrical instrumentation.

Refer to the unit wiring label when making these checkouts.

A07680

Fig. 21 -- Burner Rack Removed

FEEDER TUBE

STUB TUBE

NOTE: Refer to the heating and/or cooling sequence of operation

in this publication as an aid in determining proper control

operation.

Refrigerant Circuit

Annually inspect all refrigerant tubing connections and the unit

base for oil accumulations. Detecting oil generally indicates a

refrigerant leak.

WARNING

DEFROST

THERMOSTAT

EXPLOSION,

ENVIRONMENTAL HAZARD

PERSONAL

INJURY

AND

C99029

Failure to follow this warning could result in personal injury,

death or property damage.

Fig. 22 -- Defrost Thermostat Location

System under pressure. Relieve pressure and recover all

refrigerant before system repair or final unit disposal. Use all

service ports and open all flow--control devices, including

solenoid valves.

If oil is detected or if low cooling performance is suspected,

leak--test all refrigerant tubing using an electronic leak--detector,

halide torch, or liquid--soap solution. If a refrigerant leak is

detected, refer to the Check for Refrigerant Leaks section.

If no refrigerant leaks are found and low cooling performance is

suspected, refer to the Checking and Adjusting Refrigerant Charge

section.

switches are specifically designed to operate with Puron (R--410A)

systems. R--22 pressure switches must not be used as replacements

for the Puron (R--410A) system.

Gas Input

Loss of Charge Switch

The gas input does not require checking unless improper heating

performance is suspected. If a problem exists, refer to the Start--Up

section.

This switch is located on the liquid line and protects against low

suction pressures caused by such events as loss of charge, low

airflow across indoor coil, dirty filters, etc. It opens on a pressure

drop at about 20 psig. If system pressure is above this, switch

should be closed. To check switch:

Indoor Airflow

The heating and/or cooling airflow does not require checking

unless improper performance is suspected. If a problem exists, be

sure that all supply-- and return--air grilles are open and free from

obstructions, and that the air filter is clean. When necessary, refer to

the Indoor Airflow and Airflow Adjustments section to check the

system airflow.

1. Turn off all power to unit.

2. Disconnect leads on switch.

3. Apply ohm meter leads across switch. You should have

continuity on a good switch.

NOTE: Because these switches are attached to refrigeration

system under pressure, it is not advisable to remove this device for

troubleshooting unless you are reasonably certain that a problem

exists. If switch must be removed, remove and recover all system

charge so that pressure gauges read 0 psi. Never open system

without breaking vacuum with dry nitrogen.

Check Defrost Thermostat

The defrost thermostat is usually located on the lowest liquid

leaving circuit of the left condenser coil (see Fig. 22). The

thermostat closes at 32_F (0_C) and opens at 65_F (18_C).

Puron Items

High--Pressure Switch

Metering Device (Thermostatic Expansion Valve &

Piston)

This unit uses both a hard shutoff, balance port TXV in the indoor

coil and a piston in each side of the outdoor coil. The TXV

maintains a constant superheat at the evaporator coil exit (cooling

mode) resulting in higher overall system efficiency.

The high--pressure switch is located in the discharge line and

protects against excessive condenser coil pressure. It opens at 650

psig.

High pressure may be caused by a dirty outdoor coil, failed fan

motor, or outdoor air recirculation. To check switch:

1. Turn off all power to unit.

2. Disconnect leads on switch.

Pressure Switches

Pressure switches are protective devices wired into control circuit

(low voltage). They shut off compressor if abnormally high or low

pressures are present in the refrigeration circuit. These pressure

3. Apply ohm meter leads across switch. You should have

continuity on a good switch.

Speedup

Pins

Quiet

Shift

Defrost interval

DIP switches

A08020

Fig. 23 -- Defrost Control

Copeland Scroll Compressor (Puron Refrigerant)

The scroll compressor pumps refrigerant throughout the system by

the interaction of a stationary and an orbiting scroll. The scroll

compressor has no dynamic suction or discharge valves, and it is

more tolerant of stresses caused by debris, liquid slugging, and

flooded starts. The compressor is equipped with an internal

pressure relief port. The pressure relief port is a safety device,

designed to protect against extreme high pressure. The relief port

has an operating range between 550 and 625 psi differential

pressure.

The compressor used in this product is specifically designed to

operate with Puron (R--410A) refrigerant and cannot be

interchanged.

The compressor is an electrical (as well as mechanical) device.

Exercise extreme caution when working near compressors. Power

should be shut off, if possible, for most troubleshooting techniques.

Refrigerants present additional safety hazards.

WARNING

EXPLOSION HAZARD

Failure to follow this warning could result in personal injury

or death and/or property damage.

Wear safety glasses and gloves when handling refrigerants.

Keep torches and other ignition sources away from

refrigerants and oils.

C99097

Fig. 24 -- Refrigerant Circuit

INDOOR COIL

OUTDOOR COIL

TXV in Metering

Position

LCS

HPS

Bypass

Position

LEGEND

HPS – High Pressure Switch

LCS – Loss of Charge Switch

Accurater Metering Device

Arrow indicates direction of flow

C03011

Fig. 25 -- Typical Heat Pump Operation, Cooling Mode

INDOOR COIL

OUTDOOR COIL

TXV in Bypass

Position

LCS

HPS

Metering

Position

LEGEND

HPS – High Pressure Switch

LCS – Loss of Charge Switch

Accurater Metering Device

Arrow indicates direction of flow

C03012

Fig. 26 -- Typical Heat Pump Operation, Heating Mode

Synthetic Roof Precautionary Procedure

WARNING

1. Cover extended roof working area with an impermeable

polyethylene (plastic) drip cloth or tarp. Cover an

approximate 10x10 ft (3x3 m) area.

UNIT OPERATION AND SAFETY HAZARD

2. Cover area in front of the unit service panel with a terry

cloth shop towel to absorb lubricant spills and prevent

run--offs, and protect drop cloth from tears caused by tools

or components.

Failure to follow this warning could result in personal injury

or equipment damage.

This system uses Puron (R--410A) refrigerant which has

higher operating pressures than R--22 and other refrigerants.

No other refrigerant may be used in this system. Gauge set,

hoses,andrecoverysystemmustbe designedto handlePuron.

If you are unsure, consult the equipment manufacturer.

3. Place terry cloth shop towel inside unit immediately under

component(s) to be serviced and prevent lubricant run--offs

through the louvered openings in the unit base.

4. Perform required service.

5. Remove and dispose of any oil contaminated material per

local codes.

Refrigerant System

This information covers the refrigerant system of the 48VT--A

including the compressor oil needed, servicing systems on roofs

containing synthetic materials, the filter drier and refrigerant

charging.

Liquid Line Filter Drier

This filter drier is specifically designed to operate with Puron. Use

only factory--authorized components. Filter drier must be replaced

whenever the refrigerant system is opened. When removing a filter

drier, use a tubing cutter to cut the drier from the system. Do not

unsweat a filter drier from the system. Heat from unsweating will

release moisture and contaminants from drier into system.

Compressor Oil

If additional oil is needed use Uniqema RL32--3MAF. If this oil is

not available, use Copeland Ultra 32CC or Mobil Artic EAL22CC.

This oil is extremely hygroscopic, meaning it absorbs water

readily. POE oils can absorb 15 times as much water as other oils

designed for HCFC and CFC refrigerants. Take all necessary

precautions to avoid exposure of the oil to the atmosphere.

Puron (R--410A) Refrigerant Charging

Refer to unit information plate and charging chart. Some R--410A

refrigerant cylinders contain a dip tube to allow liquid refrigerant to

flow from cylinder in upright position. For cylinders equipped

with a dip tube, charge Puron units with cylinder in upright

position and a commercial metering device in manifold hose.

Charge refrigerant into suction--line.

Servicing Systems on Roofs and with Synthetic materials

POE (polyolester) compressor lubricants are known to cause long

term damage to some synthetic roofing materials.

Exposure, even if immediately cleaned up, may cause

embrittlement (leading to cracking) to occur in one year or more.

When performing any service that may risk exposure of

compressor oil to the roof, take appropriate precautions to protect

roofing. Procedures which risk oil leakage include, but are not

limited to, compressor replacement, repairing refrigerant leaks,

replacing refrigerant components such as filter drier, pressure

switch, metering device, coil, accumulator, or reversing valve.

TROUBLESHOOTING

Use the Troubleshooting Guides (See Tables 10--12) if problems

occur with these units.

START--UP CHECKLIST

Use Start--Up checklist to ensure proper start--up procedures are

followed.

PURONR (R--410A) QUICK REFERENCE GUIDE

Puron refrigerant operates at 50--70 percent higher pressures than R--22. Be sure that servicing equipment and replacement

components are designed to operate with Puron

Puron refrigerant cylinders are rose colored.

Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.

Puron systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose when

charging into suction line with compressor operating

Manifold sets should be minimum 700 psig high side and 180 psig low side with 550 psig low--side retard.

Use hoses with minimum 700 psig service pressure rating.

Leak detectors should be designed to detect HFC refrigerant.

Puron, as with other HFCs, is only compatible with POE oils.

Vacuum pumps will not remove moisture from oil.

Do not use liquid--line filter driers with rated working pressures less than 600 psig.

Do not leave Puron suction line filter driers in line longer than 72 hrs.

Do not install a suction--line filter drier in liquid line.

POE oils absorb moisture rapidly. Do not expose oil to atmosphere.

POE oils may cause damage to certain plastics and roofing materials.

Wrap all filter driers and service valves with wet cloth when brazing.

A factory approved liquid--line filter drier is required on every unit.

Do NOT use an R--22 TXV.

Never open system to atmosphere while it is under a vacuum.

When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter

driers. Evacuate to 500 microns prior to recharging.

Do not vent Puron into the atmosphere.

Observe all warnings, cautions, and bold text.

All indoor coils must be installed with a hard shutoff Puron TXV metering device.

Table 11 – Troubleshooting Guide -- Cooling or Heat Pump Heating Mode

SYMPTOM

CAUSE

REMEDY

Power Failure

Call power company.

Replace fuse or reset circuit breaker.

Fuse blown or circuit breaker tripped

Defective thermostat, contactor, transformer, or control

relay

Compressor and Outdoor fan will not

start.

Replace component.

Insufficient line voltage

Determine cause and correct.

Incorrect or faulty wiring

Check wiring diagram and rewire correctly.

Lower thermostat setting below room temperature.

Check wiring and repair or replace.

Thermostat setting too high

Faulty wiring or loose connections in compressor circuit

Compressor motor burned out, seized, or internal over-

load open

Determine cause Replace compressor.

Compressor will not start but Outdoor

fan runs.

Defective run/start capacitor, overload, start relay

Determine cause and replace.

Replace fuse or reset circuit breaker. Determine

cause.

One leg of 3---phase power dead

Three---phase scroll compressor makes

excessive noise, and there may

be a low pressure differential.

Correct the direction of rotation by reversing the

3---phase power leads to the unit.

Scroll compressor is rotating in the wrong direction

Refrigerant overcharge or undercharge

Recover refrigerant, evacuate system, and recharge

to capacities shown on nameplate.

Replace and determine cause.

Determine cause and correct.

Determine cause and replace.

Replace thermostat.

Defective compressor

Insufficient line voltage

Compressor cycles (other than normally

satisfying thermostat).

Blocked Outdoor

Defective run/start capacitor, overload or start relay

Defective thermostat

Faulty Outdoor---fan motor or capacitor

Damaged reversing valve

Restriction in refrigerant system

Dirty air filter

Replace.

Determine cause and correct

Locate restriction and remove.

Replace filter.

Unit undersized for load

Thermostat set too low

Low refrigerant charge

Mechanical damage in compressor.

Air in system

Decrease load or increase unit size.

Reset thermostat.

Locate leak, repair, and recharge.

Replace compressor.

Recover refrigerant, evacuate system, and recharge.

Check defrost time settings, Reset as necessary

Check defrost temperature switch, Replace as nec-

essary

Compressor operates continuously.

Excessive head pressure.

Frosted coil with incorrect defrost operation

Outdoor coil dirty or restricted

Dirty air filter

Dirty Indoor or Outdoor coil

Refrigerant overcharged

Air in system

Indoor or Outdoor air restricted or air short---cycling

Low refrigerant charge

Compressor IPR leaking

Restriction in liquid tube

High heat load

Compressor IPR leaking

Refrigerant overcharged

Reversing valve hung up or leaking internally

Dirty air filter

Low refrigerant charge

Metering device or low side restricted

Clean coil or remove restriction .

Replace filter.

Clean coil.

Recover excess refrigerant.

Recover refrigerant, evacuate system, and recharge.

Determine cause and correct.

Check for leaks, repair, and recharge.

Replace compressor.

Head pressure too low.

Remove restriction.

Check for source and eliminate.

Replace compressor.

Excessive suction pressure.

Recover excess refrigerant.

Replace valve

Replace Filter.

Check for leaks, repair, and recharge.

Remove source of restriction.

Increase air quantity. Check filter — replace if neces-

sary.

Insufficient Indoor airflow

Suction pressure too low.

Temperature too low in conditioned area

Outdoor ambient below 55°F (12.8°C)

Field---installed filter---drier restricted

Reset thermostat.

Install low---ambient kit.

Replace.

Move timer on control board to 30 minutes between

defrost cycles

(Heat) Outdoor coil frosted

Compressor runs but outdoor fan does

not

Check condition of relay on board Replace if neces-

sary

NC (normally closed) contacts on defrost board open

Table 12 – Troubleshooting Guide–Heating

SYMPTOM

CAUSE

REMEDY

Water in gas line

Drain. Install drip leg.

No power to furnace

Check power supply fuses, wiring or circuit breaker.

Check transformer.

NOTE: Some transformers have internal over--current protection

that requires a cool--down period to reset.

No 24--v power supply to control circuit

Burners will not ignite

Mis--wired or loose connections

Misaligned spark electrodes

Check all wiring and wire nut connections

Check flame ignition and sense electrode positioning.

Adjust as necessary.

1. Check gas line for air. Purge as necessary. NOTE: After purging

gas line of air, wait at least 5 minutes for any gas to dissipate be-

fore attempting to light unit.

No gas at main burners

2. Check gas valve.

Dirty air filter

Clean or replace filter as necessary

Gas input to furnace too low

Unit undersized for application

Restricted airflow

Check gas pressure at manifold match with that on unit nameplate

Replace with proper unit or add additional unit

Clean or replace filter. Remove any restriction.

Inadequate heating

Check rotation of blower, temperature rise of unit. Adjust as neces-

sary.

Limit switch cycles main burners

1. Tighten all screws around burner compartment

2. Cracked heat exchanger. Replace.

3. Unit over--fired. Reduce input (change orifices or adjust gas line

or manifold pressure).

4. Check burner alignment.

Incomplete combustion results in: Aldehyde odors,

carbon monoxide, sooting flame, floating flame

Poor flame characteristics

5. Inspect heat exchanger for blockage. Clean as necessary.

Table 13 – Troubleshooting Guide–LED Status Codes

SYMPTOM

CAUSE

REMEDY

Check 5--amp fuse son IGC*, power to unit, 24--v circuit breaker,

and transformer. Units without a 24--v circuit breaker have an

internal overload in the 24--v transformer. If the overload trips,

allow 10 minutes for automatic reset.

No Power Hardware failure

(LED OFF)

Loss of power to control module (IGC)*.

Check the operation of the indoor (evaporator) fan motor. Ensure

that the supply--air temperature rise is in accordance with the

range on the unit nameplate. Clean or replace filters.

Limit switch faults

(LED 2 flashes)

High temperature limit switch is open.

The IGC* sensed flame that should not be present.

Inadequate airflow to unit.

Flame sense fault

(LED 3 flashes)

Reset unit. If problem persists, replace control board.

4 consecutive limit switch

faults

(LED 4 flashes)

Check the operation of the indoor (evaporator) fan motor and that

supply--air temperature rise agrees with range on unit nameplate

information.

Check ignitor and flame sensor electrode spacing, gaps, etc.

Ensure that fame sense and ignition wires are properly terminated.

Verify that unit is obtaining proper amount of gas.

Verify wiring connections to pressure switch and inducer motor.

Verify pressure switch hose is tightly connected to both inducer

housing and pressure switch. Verify inducer wheel is properly

attached to inducer motor shaft. Verify inducer motor shaft is turn-

ing.

Ignition lockout

(LED 5 flashes)

Unit unsuccessfully attempted ignition for 15 minutes.

Open pressure switch.

Pressure Switch motor fault

(LED 6 flashes)

Rollout switch will automatically reset, but IGC* will continue to

lockout unit. Check gas valve operation. Ensure that induced--draft

blower wheel is properly secured to motor shaft. Inspect heat

exchanger. Reset unit at unit disconnect.

Rollout switch fault

(LED 7 flashes)

Rollout switch has opened.

Internal control fault

(LED 8 flashes)

Microprocessor has sensed an error in the software

or hardware.

If error code is not cleared by resetting unit power, replace the

IGC*.

Temporary 1 hr auto reset

(LED 9 flashes)

Reset 24--v. to control board or turn thermostat off, then on again.

Fault will automatically reset itself in one (1) hour.

Electrical interference impeding IGC software

*WARNING

: If the IGC must be replaced, be sure to ground yourself to dissipate any electrical charge that my be present before handling new control

board. The IGC is sensitive to static electricity and my be damaged if the necessary precautions are not taken.

IMPORTANT: Refer to Table 12---Troubleshooting Guide---Heating for additional troubleshooting analysis.

LEGEND

IGC—Integrated Gas Unit Controller

LED—Light---Emitting Diode

START--UP CHECKLIST

(Remove and Store in Job Files)

I. PRELIMINARY INFORMATION

MODEL NO.:

SERIAL NO.:

DATE:

TECHNICIAN:

II. PRESTART--UP (Insert check mark in box as each item is completed)

( ) VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT

( ) REMOVE ALL SHIPPING HOLD DOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS

( ) CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS

( ) CHECK GAS PIPING FOR LEAKS (WHERE APPLICABLE)

( ) CHECK THAT INDOOR (EVAPORATOR) AIR FILTER IS CLEAN AND IN PLACE

( ) VERIFY THAT UNIT INSTALLATION IS LEVEL

( ) CHECK FAN WHEEL, AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW TIGHTNESS

III. START--UP

ELECTRICAL

SUPPLY VOLTAGE

COMPRESSOR AMPS

INDOOR (EVAPORATOR) FAN AMPS

TEMPERATURES

OUTDOOR (CONDENSER) AIR TEMPERATURE

RETURN--AIR TEMPERATURE

COOLING SUPPLY AIR

HEAT PUMP SUPPLY AIR__________________

GAS HEAT SUPPLY AIR

PRESSURES

GAS INLET PRESSURE

IN. W.C.

GAS MANIFOLD PRESSURE

REFRIGERANT SUCTION

REFRIGERANT DISCHARGE

IN. W.C.

PSIG, SUCTION LINE TEMP*

PSIG, LIQUID TEMP{

( ) VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS

GAS HEAT TEMPERATURE RISE

TEMPERATURE RISE (See Literature) RANGE

MEASURED TEMPERATURE RISE

* Measured at suction inlet to compressor

{

Measured at liquid line leaving condenser.

Catalog No: 48VT---05SI

Edition Date: 04/09

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Replaces: 48VT---04SI

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