Carrier Heat Pump 50XT User Manual

50XT

Infinity 15t SEER Single---Packaged Heat Pump System

with Puronr (R---410A) Refrigerant

Single Phase

2---5 Nominal Tons (Sizes 024---060)

Product Data

Comfort Heat Pump System with IdealHumidityt featuring

Infinityt control variable--speed blower motor and two--stage

cooling and heating that provides greater comfort, humidity

control, and energy efficiency.

Variable--speed blower motors provide better comfort and energy

efficiency. You can expect up to 30 times better dehumidification;

economical constant airflow which provides improved indoor air

quality and more even temperatures from room to room; and

reduced indoor noise due to lower air velocity. In addition, you’ll

realize improved installation flexibility with 3 different airflow

choices for best overall comfort.

Easy installation

Factory--assembled package is a compact, fully self--contained heat

pump unit that is pre--wired, pre--piped, and pre--charged for

minimum installation expense. 50XT units are available in a

variety of standard capacity ranges. Units install easily on a rooftop

or at ground level.

Durable, dependable components

Compressors have two stages of cooling and heating and are

designed for high efficiency. Each compressor is hermetically

sealed against contamination to help promote longer life and

dependable operation. Vibration isolation provides quiet operation.

Compressors have internal high--pressure and overcurrent

protection.

A05307

Fig. 1 -- Unit 50XT

Convertible duct configuration

Single--Packaged Products with energy--saving features and

Puron refrigerant.

S Up to 15.5 SEER

Unit is designed for easy use in either downflow or horizontal

applications. Each unit is easily converted from horizontal to

downflow with two duct covers (available as an accessory).

Downflow operation is easily provided in the field to allow vertical

ductwork connections. The basepan utilizes knockout style seals

on the bottom openings to ensure a positive seal in the horizontal

airflow mode.

S Up to 8.0 HSPF

S Up to 12 EER at 95°F (35°C) OD

S Low Sound Levels

S Variable--Speed Blower (Standard)

S Factory--Installed TXV

Direct--drive, variable--speed blower motor is standard on all

50XT models.

S Two--stage cooling and heat pump operation

Direct--drive, PSC condenser fan motors are designed to help

reduce energy consumption and provide for cooling operation

down to 55°F (12.7°C) outdoor temperature. Low--ambient

cooling is available below 55°F (12.7°C) when low--ambient

FEATURES/BENEFITS

One--piece Heat Pump unit with optional electric heater, low

installation cost, dependable performance and easy maintenance.

cooling is enabled in the User Interace (UI). Motormaster II

low--ambient kit is not required.

Infinityt User Interface is designed to work as a system with

Carrier’s single--packaged product.

Refrigerant system is designed to provide dependability. Liquid

refrigerant filter driers are used to promote clean, unrestricted

operation. Each unit leaves the factory with a full Puron refrigerant

charge. Refrigerant service connections make checking operating

pressures easier.

Efficient operation

High--efficiency design with SEERs (Seasonal Energy Efficiency

Ratio) of up to 15.5.

Puron environmentally--sound refrigerant is Carrier’s unique

refrigerant designed to help protect the environment. Puron is an

HFC refrigerant which does not contain chlorine that can harm the

ozone layer. Puron refrigerant is in service in millions of systems

proving highly reliable, environmentally sound performance.

Indoor and outdoor coils are computer designed for optimum

heat transfer and cooling efficiency. The indoor coil is fabricated

from copper tube and aluminum fins and is located inside the unit

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MODEL NUMBER NOMENCLATURE

50XT

024

– – –

– –

Options

BT - AL evap, vinyl condens

CC - AL evap, CU condens

CU - CU evap & condens

TP - Base unit with tin plated

indoor coil hairpins

Type of Unit

50XT - Packaged

Electric Heat Pump

TV - TP with vinyl coating on outdoor coil

TC - TP with AL indoor coil and

CU/CU outdoor coil

Nominal Cooling Capacity

024 - 2 Ton

030 - 2.5 Ton

036 - 3 Ton

042 - 3.5 Ton

048 - 4 Ton

Only used if ordering an option

060 - 5 Ton

Packaging

N/A

Series

LEGEND

Electrical Supply

AL - Aluminum

CU - Copper

3- 208/230-1-60

ARI* CAPACITIES

Cooling Capacities and Efficiencies

UNIT

50XT

NOMINAL

TONS

STANDARD CFM (High/Low Stage)

(Cooling & Heating)

NET COOLING CAPACITIES (Btuh)

(High/Low Stage)

SEER‡

EER @A{

024

030

036

042

048

060

2--1/2

3--1/2

800 / 600

1000 / 700

1200 / 850

1500 / 975

1600 / 1100

1750 / 1200

22,600 / 17,600

28,600 / 21,400

34,600 / 24,400

40,500 / 29,000

46,000 / 33,400

57,000 / 40,500

11.4

11.6

15.5

15.0

14.5

Heating Capacities and Efficiencies

HIGH HEAT CAPACITY

(BTUH) @ 47°F (8.3°C)

(High/Low Stage)

HIGH HEAT COP

LOW HEAT CAPACITY

(BTUH) @ 17°F (-8.3°C)

(High/Low Stage)

LOW HEAT COP

@ 17°F (-8.3°C)

(High/Low Stage)

UNIT

50XT

@ 47°F (8.3°C)

(High/Low Stage)

HSPF‡

024

030

036

042

048

060

20,800 / 16,800

27,600 / 20,400

33,600 / 23,000

39,500 / 27,600

45,500 / 32,200

56,000 / 39,500

3.3 / 3.2

3.5 / 3.5

3.4 / 3.4

3.6 / 3.5

3.3 / 3.5

3.2 / 3.3

11,600 / 8,400

14,000 / 9,600

17,200 / 11,200

20,600 / 14,200

25,000 / 15,200

30,800 / 20,400

2.2 / 1.8

2.1 / 1.9

2.4 / 1.7

2.3 / 2.0

2.4 / 1.9

2.2 / 1.9

8.0

{ ”A” conditions---80°F (26.6°C) indoor db/67°F (19.4°C) indoor wb & 95°F (35°C) outdoor db.

}

Rated in accordance with U.S. Government DOE (Department of Energy) test procedures and/or ARI Standards 210/240.

** Tested in accordance with ARI Standard 270---95 (not listed in ARI).

NOTES:

1. Ratings are net values, reflecting the effects of circulating fan heat. Ratings are based on:

Cooling Standard: 80°F (26.6°C) db, 67°F (19.4°C) wb indoor entering ---air temperature and 95°F (35°C) db outdoor entering---air temperature.

2. Before purchasing this appliance, read important energy cost and efficiency information available from your retailer.

LEGEND

dBA—Sound Levels (decibels)

db—Dry Bulb

SEER—Seasonal Energy Efficiency Ratio

wb—Wet Bulb

COP—Coefficient of Performance

HSPF—Heating Season Performance Factor

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PHYSICAL DATA

UNIT SIZE

024

405

184

030

2 --- 1/2

435

036

464

210

042

3 --- 1/2

476

048

492

223

060

535

243

NOMINAL CAPACITY (ton)

OPERATING WEIGHT (lb)

(kg)

197

216

COMPRESSOR

Two --- Stage Scr ol l

REFRIGERANT: PURON (R---410A) Quantity (lb)

10.3

4.7

11.5

5.2

9.7

4.4

14.0

6.4

15.5

7.0

16.0

7.3

(kg)

EXPANSION DEVICE---HEATING

ORIFICE OD (in.) --- Left

ORIFICE OD (in.) --- Right

AccuRater

0.038

0.035

0.040

0.042

0.038

0.046

0.042

EXPANSION DEVICE---COOLING

Size

TXV

2 Ton

3 Ton

4 Ton

5 Ton

Part Number

EA36YD129

EA36YD139

EA36YD149

EA36YD159

OUTDOOR COIL

Rows…Fins/in.

Face Area (sq. ft.)

OUTDOOR FAN

Nominal Cfm

2…21

13.6

2…21

15.3

2…21

17.5

2…21

19.4

2…21

19.4

2…21

23.3

2700

559

2700

559

2800

559

2800

559

3300

559

3300

559

Diameter (in.)

(mm)

Motor HP (RPM)

INDOOR COIL

Rows…Fins/in.

Face Area (sq. ft.)

INDOOR FAN

Nominal Airflow (Cfm)

Comfort

1/8 (825)

1/4 (1100)

1/3 (1110)

3…17

3.7

3…17

3.7

3…17

4.7

3…17

4.7

3…17

5.7

4…17

5.7

Variable based on Comfort Settings (see User Interface instructions for more information).

Efficiency

Max

700

800

875

1000

1050

1200

1225

1400

1600

1750

2000

Size (in.)

10x10

254x254

10x10

254x254

11x10

279x254

11x10

279x254

11x10

279x254

11x10

279x254

(mm)

Motor HP (RPM)

1/2

3/4

HIGH---PRESSURE SWITCH (psig)

Cutout

670 ± 10

Reset (Auto)

470 ± 25

HIGH---PRESSURE SWITCH 2 (psig)

(Compressor Solenoid)

Cutout

565 ± 15

455 ± 15

Reset (Auto)

LOS S --- OF --- CHARGE /LOW --- PRE S SU RE SWIT C H

(Liquid Line) (psig)

Cutout

Reset (Auto)

23 ± 5

55 ± 5

RETURN---AIR FILTERS Throwaway (in.)*

(mm)

20x24x1

508x610x25

24x30x1

610x762x25

24x36x1

610x914x25

*Recommended filter sizes for field---installed air filter grilles mounted on the wall or ceiling of the conditioned structure. 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 throwaway type or

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

ISO 9001:2000

REGISTERED

A--WEIGHTED SOUND POWER LEVEL (dBA)

STANDARD

RATING

(dBA)

TYPICAL OCTAVE BAND SPECTRUM (dBA) (without tone adjustment)

MODEL 50XT

125

250

500

1000

2000

4000

8000

024

030

036

042

048

060

58.8

60.7

56.7

62.4

63.5

63.3

62.8

69.9

67.6

67.2

66.8

67.8

71.3

71.8

66.9

66.5

67.4

73.4

75.5

63.7

64.2

63.7

70.0

71.0

58.3

60.3

57.7

66.3

68.1

50.0

53.0

50.8

60.1

59.9

NOTE: Tested in accordance with ARI Standard 270---95 (not listed in ARI).

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OPTIONS AND ACCESSORIES

Factory--installed options

compartment. Heater sizes range from 5.0 to 20.0 kW. The electric

heater design allows the use of a single--point power supply for the

entire unit, resulting in lower installed costs.

Coil options include tin--plated* indoor hairpins, copper/copper

and vinyl--coated construction for refrigerant coils. Units are

shipped standard with copper tube/aluminum fin construction. See

model number nomenclature for coil options.

Flat roof curbs in both 8 in. (203 mm) and 14 in. (256 mm) sizes

are available for roof mounted applications.

*Tin--plated indoor coils are built with special hairpins that are

designed to resist both general pitting corrosion and excessive

indoor corrosion (Formicary Corrosion).

Square--to--round duct transition kit enables 024--048 size units

to be fitted to 14 in. round ductwork.

Infinity User Interface coupled with the system’s variable--speed

indoor blower delivers Carrier’s patented IdealHumidity

technology that allows for even greater humidity control. Along

with more precisely controlling temperature and humidity, the

Infinity User Interface offers full seven--day programmability

allowing you to further customize your comfort and energy

savings.

Field--installed accessories

Manual Air Damper (25% open)

Electric Heaters

Filter Rack

Flat Roof Curbs (8--in. and 14--in.) (203 mm and 256 mm)

Square--to--Round Duct Transition Kit

Infinityt User Interface

Crankcase Heater

Lifting Kit

Lifting kit includes 4 metal brackets that are available to assist in

lifting this product onto a roof application.

Crankcase heater

provides anti--floodback protection for

low--load cooling applications.

Compressor Hard Start Kit

Filter rack

features easy installation, serviceability, and

high--filtering performance for vertical or horizontal applications.

Manual outside air damper includes hood and filter rack with

adjustable damper blade for up to 25% outdoor air.

Electric heaters provide additional heat in the unit when required.

Each package has a heater module that slides into the controls

Compressor hard start kit assists compressor start--up by

providing additional starting torque on single phase units and

prolongs compressor motor life.

Electric Heaters

NOMINAL

USED WITH SIZES

CATALOG

ORDERING NO.

CAPACITY

(kW)

FUSED

STAGES

208/240 — SINGLE PHASE (60 Hz)

CPHEATER080A00

CPHEATER081A00

CPHEATER083A00

CPHEATER085A00

CPHEATER087A00

CPHEATER089A00

NOTE

3.8 / 5.0

YES

5.4 / 7.2

7.5 / 10.0

11.3 / 15.0

15.0 / 20.0

Electric heaters are rated at 240v. Refer to Multiplication Factors table for other voltages.

X=Approved combination

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FILTER RACK

MANUAL OUTSIDE AIR DAMPER

BEND FLANGE AT 90°-SCREW TO

DIVIDER WITH 1-IN. SCREW

REPLACEMENT

PANEL

MANUAL OUTSIDE

AIR HOOD

TOP FILTER RACK

EVAPORATOR

COIL

DAMPER

BLADE

BOTTOM FILTER

RACK

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ACCESSORY DIMENSIONS

HVACunit

base

HVAC unit

base

Gask eting

inner flange*

Screw

(NOTE A)

Screw

(NOTE A)

Gasketing

inner flange*

*Gasketing

outer flange

*Gasketing

outer flange

Wood nailer*

Flashing field

supplied

Flashing field

supplied

Roof curb*

Insulation(field

supplied)

Insulation(field

supplied)

Roofing material

field supplied

Roofing material

field supplied

Ductwork

field supplied

Ductwork

field supplied

Cant strip

field supplied

Cant strip

field supplied

Roof

*Provided with roof curb

Roof Curb for Small Cabinet

Roof Curb for Large Cabinet

Note A: When unit mounting screw is used,

retainer bracket must also be used.

Note A: When unit mounting screw is used,

retainer bracket must also be used.

Supply opening

(B x C)

BTyp.

CTyp.

R/A

S/A

Gasket around

duct

Short

Support

Insulated

deck pan

Gasket around

outer edge

Insulated

deck pan

Long

Support

Return opening

(B X C)

A05308

CATALOG

NUMBER

UNIT SIZE

024-030

036-060

IN. (MM)

CPRFCURB006A00

CPRFCURB007A00 14 (356)

CPRFCURB008A00

CPRFCURB009A00 14 (356) 16--3/16 (411) 17--3/8 (441) 40--1/4 (1022) 41--15/16 (1065) 44--7/16 (1129)

8 (203)

11 (279)

16--1/2 (419)

28--3/4 (730)

30--3/8 (771)

44--5/16 (1126) 45--15/16 (1167)

8 (203) 16--3/16 (411) 17--3/8 (441) 40--1/4 (1022) 41--15/16 (1065) 44--7/16 (1129)

46--1/16 (1169)

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 mm) thick fiberglass 1 lb. density.

6. When unit mounting screw is used (see Note A), a retainer bracket must be used as well. This bracket must also be used when required by code for hurricane or seismic

conditions. This bracket is available through Micrometl.

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50XT SUGGESTED RIGGING

-in. (914 mm)

DETAIL

A06296

RIGGING WT

CABINET

MODEL

A06298

50XT--024

50XT--030

418

448

190

203

Small

50XT--036

50XT--042

50XT--048

50XT--060

469

491

497

548

213

223

225

249

Large

NOTE: See dimensional drawing for corner weight distribution. Corner

weights shown on drawing are based on unit---only weights and do

not include packaging.

SELECTION PROCEDURE

Enter the Electric Heater table on page

for 208/230v,

Determine cooling and heating requirements at design

single--phase, unit. The 7.2--kW heater at 240v most closely

satisfies the heating required. To calculate kW at 230v, multiply the

heater kW by multiplication factor 0.92 found in the Multiplication

Factors table on page 29.

conditions

Given:

REQUIRED COOLING CAPACITY (TC) . . . . . . 34,500 BTUH

SENSIBLE HEAT CAPACITY (SHC) . . . . . . . . . 24,000 BTUH

7.2 kW x 0.92 = 6.6 kW

REQUIRED HEATING CAPACITY (SHC) . . . . . 36,000 BTUH

CONDENSER ENTERING AIR TEMPERATURE 95°F (35°C)

INDOOR--AIR TEMPERATURE . . . 80°F (26.6°C) EDB, 67°F

(19.4°C) EWB

6.6 kW x 3414 Btuh/kW = 22,532 Btuh

Total unit heating capacity is 39,342 Btuh

(16,810 + 22,532).

EVAPORATOR AIR QUANTITY . . . . . . . . . . . . . . . 1200 CFM

ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . 230--1--60

Select unit that corresponds to power source available

The Electrical Data table shows that the unit is designed to operate

at 208/230--1--60.

Select unit based on required cooling capacity

Enter Net Cooling Capacities table at condenser entering

temperature of 95°F (35°C). The 036 unit at 1200 cfm and 67°F

(19.4°C) ewb (entering wet bulb) will provide a total capacity of

34,600 Btuh and a SHC of 24,220 Btuh. Calculate SHC correction,

if required, using Note 4 under Cooling Capacities tables.

Select electric heat

Enter the 036 unit Heating Extended Performance table at 1200

cfm. At 70°F (21.1°C) return indoor air and 20°F (--6.6°C) air

entering outdoor coil, the integrated heating capacity is 16,810

Btuh. (Select integrated heating capacity value since deductions for

outdoor--coil frost and defrosting have already been made. No

correction is required.)

The required heating capacity is 36,000 Btuh. Therefore, at least

19,190 Btuh additional electric heat is required.

Determine additional electric heat capacity in kW.

19,190 Btuh

3414 Btuh/kW

= 5.6kW of heat required

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PERFORMANCE DATA (CONT)

Multiplication Factors

Heater kW

Rating

Voltage Distribution

V/3/60

Example: 15.0 kW (at 240v) heater on 208v

= 15.0 (.75 mult factor)

Multiplication Factor

= 11.25 capacity at 208v

200

208

230

240

.69

.75

.92

240

Sensible capacity (Btuh)

1.10 x cfm

1.00

LEGEND

BF— Bypass Factor

edb— Entering Dry--Bulb

Ewb— Entering Wet--Bulb

kW — Total Unit Power Input

ldb— Leaving Dry--Bulb

ldb = edb

Wet---bulb temperature corresponding to enthalpy

lwb =

air leaving evaporator coil ( lwb)

total capacity (Btuh)

lwb— Leaving Wet--Bulb

SHC— Sensible Heat Capacity (1000 Btuh)

TC — Total Capacity (1000 Btuh) (net)

lwb = e w b ---

4.5 x cfm

Where: ewb = Enthalpy of air entering evaporator coil

4. The SHC is based on 80_F (26.6_C) edb temperature of air

entering evaporator coil. Below 80_F (26.6_C) edb, subtract (corr

factor x cfm) from SHC.

*At 75°F (23.8°C) entering dry bulb (Tennessee Valley Authority

[TVA] rating conditions); all other at 80°F (26.6°C) entering dry

bulb.

COOLING NOTES:

1. Ratings are net; they account for the effects of the evaporator

fan motor power and heat.

Above 80_F (26.6_C) edb, add (corr factor x cfm) to SHC.

Correction Factor = 1.10 x (1 + BF) x (edb + 80).

5. Integrated capacity is maximum (instantaneous) capacity less the

effect of frost on the outdoor coil and the heat required to defrost it.

2. Direct interpolation is permissible. Do not extrapolate.

3. The following formulas may be used:

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Wet coil air delivery -- low stage

208/230 VOLT

EXTERNAL STATIC PRESSURE (in. wc)

0.4 0.5 0.6 0.7

Variable based on Comfort Settings

UNIT

SYSTEM SETTING

SIZE

0.1

0.2

0.3

0.8

0.9

1.0

COMFORT (Default)

EFFICIENCY

MAX

COMFORT (Default)

EFFICIENCY

MAX

COMFORT (Default)

EFFICIENCY

MAX

COMFORT (Default)

EFFICIENCY

MAX

COMFORT (Default)

EFFICIENCY

MAX

COMFORT (Default)

EFFICIENCY

MAX

525

600

525

600

525

600

525

600

525

600

525

600

525

600

525

600

525

600

525

600

024

030

036

042

048

060

Variable based on Comfort Settings

613

700

Variable based on Comfort Settings

743

850

Variable based on Comfort Settings

853

975

Variable based on Comfort Settings

963

613

700

613

700

613

700

613

700

613

700

613

700

613

700

613

700

613

700

743

850

743

850

743

850

743

850

743

850

743

850

743

850

743

850

743

850

853

975

853

975

853

975

853

975

853

975

853

975

853

975

853

975

853

975

963

1100

963

1100

963

1100

963

1100

963

1100

963

1100

963

1100

963

1100

963

1100

Variable based on Comfort Settings

1200

1372

1200

1372

1200

1372

1200

1372

1200

1372

1200

1372

1200

1372

1200

1372

1200

1372

1200

1372

Wet coil air delivery -- high stage

208/230 VOLT

EXTERNAL STATIC PRESSURE (in. wc)

0.4 0.5 0.6 0.7

Variable based on Comfort Settings

UNIT

SYSTEM SETTING

SIZE

0.1

0.2

0.3

0.8

0.9

1.0

COMFORT (Default)

EFFICIENCY

MAX

COMFORT (Default)

EFFICIENCY

MAX

COMFORT (Default)

EFFICIENCY

MAX

COMFORT (Default)

EFFICIENCY

MAX

COMFORT (Default)

EFFICIENCY

MAX

COMFORT (Default)

EFFICIENCY

MAX

700

800

700

800

700

800

700

800

700

800

700

800

700

800

700

800

700

800

700

800

024

030

036

042

048

060

Variable based on Comfort Settings

875

1000

Variable based on Comfort Settings

1050

1200

Variable based on Comfort Settings

1225

1400

Variable based on Comfort Settings

1400

1600

Variable based on Comfort Settings

1750

2000

875

1000

875

1000

875

1000

875

1000

875

1000

875

1000

875

1000

875

1000

875

1000

1050

1200

1050

1200

1050

1200

1050

1200

1050

1200

1050

1200

1050

1200

1050

1200

1050

1200

1225

1400

1225

1400

1225

1400

1225

1400

1225

1400

1225

1400

1225

1400

1225

1400

1225

1400

1600

1400

1600

1400

1600

1400

1600

1400

1600

1400

1600

1400

1600

1400

1600

1400

1600

1750

2000

1750

2000

1750

2000

1750

2000

1750

2000

1750

2000

1750

2000

1750

2000

1750

2000

Air delivery values are based on operating voltage of 230v, and wet coil. Filter and electric heater will not change air delivery values.

NOTES:

1. See User Interface instructions for more information on Max, Efficiency, and Comfort Settings

2. Efficiency Setting operates at 350 cfm/ton (nominal) and Max Setting operates at 400 cfm/ton (nominal)

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TYPICAL PIPING AND WIRING

ROOF-MOUNTING

CURB

ROOF

RETURN-AIR

FLEXIBLE DUCT

SUPPLY-AIR

FLEXIBLE DUCT

CEILING

CONCENTRIC DIFFUSER BOX

(FIELD-SUPPLIED)

C00023

USER

INTERFACE

RETURN

AIR

FROM

POWER

SOURCE

TOP COVER

DISCONNECT

PER NEC*

*NEC - NATIONAL ELECTRICAL CODE

A06279

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To convert a unit to downflow discharge — Units are equipped

with factory--installed inserts in the downflow openings. Remove the

inserts similar to removing an electrical knock--out. Leave on duct

covers to seal the horizontal discharge openings in the unit. Units

installed in horizontal discharge orientation do not require duct cov-

ers.

APPLICATION DATA

Condensate trap — A 2--in. (51 mm) condensate trap must be field

supplied.

1” (25mm) MIN.

TRAP

OUTLET

Minimum cooling ambient operating temperature — All stan-

dard units have a minimum ambient operating temperature of 55°F

(12.7°C). With low--ambient cooling enabled at the UI, units can op-

erate at temperatures down to 0°F (--17.7°C).

2” (50mm) MIN.

Maximum operating outdoor air temperature — Maximum out-

door operating air temperature for cooling is 125°F (51.6°C).

Ductwork — Secure downflow dischargeductwork toroof curb.For

horizontal discharge applications, attach ductwork to unit with

flanges.

Balance Point Worksheet

Based on Entering Indoor Air of 70 Deg. F and Rated CFM

060

048

042

036

030

024

-20

-10

Outdoor Air Temp (Deg F)

C03008

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ELECTRICAL DATA

SINGLE POINT POWER

SUPPLY

ELECTRIC HEAT

VOLTAGE

RANGE

COMPRESSOR

OFM

FLA

IFM

FLA

UNIT SIZE

024

V--PH--HZ

NOMINAL

kW*

-- / --

FLA

MCA

MOCP

MIN

MAX

RLA

LRA

-- / --

24.3/24.3

46.9/50.3

56.8/61.8

69.4/76.4

26.2/26.2

48.7/52.2

58.7/63.7

71.3/78.3

93.9/104.3

28.6/28.6

51.2/54.6

61.1/66.1

73.7/80.7

96.3/106.7

34.9/34.9

57.5/60.9

67.4/72.4

80.0/87.0

102.6/113.0

125.2/139.1

43.1/43.1

65.7/69.1

75.6/80.6

88.2/95.2

110.8/121.2

133.4/147.3

45.2/45.2

67.7/71.2

77.6/82.7

90.3/97.2

112.9/123.3

135.4/149.3

35/35

50/60

60/70

70/80

40/40

50/60

60/70

80/80

100/110

45/45

60/60

70/70

80/90

100/110

50/50

60/70

70/80

90/90

110/125

150/150

60/60

70/70

80/90

90/100

125/125

150/150

60/60

70/80

80/90

3.8/5.0

5.4/7.2

7.5/10.0

-- / --

18.1/20.8

26.0/30.0

36.1/41.7

-- / --

208/230--1--60

187

253

15.3

52.0

0.9

4.3

3.8/5.0

5.4/7.2

7.5/10.0

11.3/15.0

-- / --

18.1/20.8

26.0/30.0

36.1/41.7

54.2/62.5

-- / --

030

036

208/230--1--60

16.8

16.7

70.0

82.0

3.8/5.0

5.4/7.2

7.5/10.0

11.3/15.0

-- / --

18.1/20.8

26.0/30.0

36.1/41.7

54.2/62.5

-- / --

187

253

0.9

6.8

3.8/5.0

5.4/7.2

7.5/10.0

11.3/15.0

15.0/20.0

-- / --

18.1/20.8

26.0/30.0

36.1/41.7

54.2/62.5

72.2/83.3

-- / --

042

048

060

208/230--1--60

21.8

27.8

27.3

96.0

3.8/5.0

5.4/7.2

7.5/10.0

11.3/15.0

15.0/20.0

-- / --

18.1/20.8

26.0/30.0

36.1/41.7

54.2/62.5

72.2/83.3

-- / --

187

253

1.5

1.9

6.8

9.1

3.8/5.0

5.4/7.2

7.5/10.0

11.3/15.0

15.0/20.0

18.1/20.8

26.0/30.0

36.1/41.7

54.2/62.5

72.2/83.3

118.0

100/110

125/125

150/150

*Heater capacity (kW) based on heater voltage of 208v & 240v. If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accord-

ingly.

LEGEND

FLA

—

Full Load Amps

LRA

Locked Rotor Amps

MCA

MOCP

RLA

Minimum Circuit Amps

Maximum Overcurrent Protection

Rated Load Amps

NOTES:

1. In compliance with NEC (National Electrical Code) requirements

for multimotor and combination load equipment (refer to NEC

Articles 430 and 440), the overcurrent protective device for the

unit shall be Power Supply fuse. The CGA (Canadian Gas

Association) units may be fuse or circuit breaker.

2. Minimum wire size is based on 60 C copper wire. If other than

60 C wire is used, or if length exceeds wire length in table,

determine size from NEC.

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TYPICAL WIRING SCHEMATIC — 230--1--60

A08201

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satisfied, the compressor will shut off. The reversing valve will

remain energized until the control board power is removed or a call

for heating is initiated. With a call for heating, the outdoor fan and

compressor are energized. The compressor will operate in high or

low stage operation, as needed, to meet the heating demand. When

the heating demand is satisfied, the compressor and fan will shut

off. The reversing valve is de--energized in the heating mode.

CONTROLS

Sequence of Operation

The 50XT packaged heat pump is designed for installation with a

communicatingUI. Thisunit willnot respondto commandsprovided

by a common thermostat except under certain emergency situations.

The UI uses temperature, humidity and other data supplied from

indoor and outdoor system components to control heating or cooling

system for optimum comfort. The unit will be commanded by the UI

to supply airflow. The unit will operate the indoor fan at requested

airflow for most modes.

NOTE: When two--stage unit is operating at low--stage, system

vapor (suction) pressure will be higher than a standard single--stage

system or high--stage operation.

NOTE:

Outdoor fan motor will continue to operate for one

The nominal requested airflow in high stage will be 350 cfm per ton

of nominal cooling capacity as defined by unit size. Actual airflow

request will be adjusted from nominal using indoor and outdoor

temperature and indoor humidity data to optimize the system

operation for occupant comfort and system efficiency. Refer to UI

literature for further system control details.

minute after compressor shuts off, when outdoor ambient is greater

than or equal to 100°F (38°C).

UTILITY INTERFACE WITH INFINITY CONTROL

The utility curtailment relay should be connected to factory

supplied pigtails (PINK connected to R, VIOLET connected to Y2

on the control board) located in the low voltage splice box (see

Typical Wiring Schematic ). This input allows a power utility

device to interrupt compressor operation during peak load periods.

When the utility sends a signal to shut the system down, the UI will

display “Curtailment Active”.

Airflow during electric heater operation must be greater than a

minimum level for safe operation. If UI instructs unit to turn on

electric heat and the requested airflow is less than the minimum level

the fan coil control will override requested value.

NOTE: Once the compressor has started and then has stopped, it

should not be started again until 4 minutes have elapsed. The cooling

cycle remains “on” until the room temperature drops to point that is

slightly below the cooling control setting of the UI.

Infinity Controlled Low Ambient Cooling

NOTE: When this unit is operating below 55_F (12.7°C) outdoor

temperature, provisions must be made for low ambient operation.

This unit is capable of low ambient cooling down to 0_F

(--17.7°C)ONLY when using the Infinity control. A low ambient kit

isnotrequired,andtheoutdoorfanmotor doesnot needto bereplaced

for Infinity controlled low ambient operation. Low ambient cooling

must be enabled in the UI set--up. Fan may not begin to cycle until

about 40_F (4.4°C) OAT. Fan will cycle based on coil and outdoor

air temperature.

COOLING AND HEATING OPERATION

With a call for first stage cooling, the outdoor fan, reversing valve,

and low stage compressor are energized. If low--stage cannot

satisfy cooling demand, high--stage cooling is energized by the UI.

After second stage is satisfied, the unit returns to low--stage

operation until first stage is satisfied or until second stage is

required again. When both first stage and second stage cooling are

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2. Fan wheel shall be made from steel, be double--inlet type. It

shall have forward--curved blades with a corrosion--resistant

finish and shall be dynamically balanced.

GUIDE SPECIFICATIONS

SINGLE--PACKAGED HEAT PUMP UNITS

CONSTANT VOLUME APPLICATION

3. Outdoor fan shall be of the direct--driven propeller type with

aluminum blades, riveted to corrosion--resistant steel spiders.

It shall be dynamically balanced, and discharge air vertically.

HVAC GUIDE SPECIFICATIONS

SIZE RANGE: 2 TO 5 TONS, NOMINAL (COOLING)

MODEL NUMBER: 50XT

D. Compressor:

1. Fully hermetic, 2--stage scroll compressors with

factory--installed vibration isolation.

PART I -- GENERAL

SYSTEM DESCRIPTION

2. Scroll compressors shall be standard on all units.

3. Compressor Protection:

Outdoor rooftop or ground mounted heat pump unit utilizing a

hermetic, 2--stage scroll compressor for heating and cooling duty

and optional electric heating. Unit shall discharge supply air ver-

tically or horizontally as shown on contract drawings. Outdoor

fan/coil section shall have a draw--thru design with vertical dis-

charge for minimum sound levels.

Defrost control shall protect compressor by preventing

“short cycling.”

E. Coils:

1. Indoor and outdoor coils shall have aluminum plate fins

mechanically bonded to seamless copper tubes with all joints

brazed.

QUALITY ASSURANCE

A. Unit shall be rated in accordance with ARI Standards

210/240 and 270.

2. Tube sheet openings shall be bellied to prevent tube wear.

B. Unit shall be designed in accordance with UL Standard

1995.

C. Unit shall be manufactured in a facility registered to ISO

9001 manufacturing quality standard

F. Refrigerant Metering Device:

Refrigerant metering device shall be of the single body,

fixed orifice feed type (outdoor) and TXV (indoor).

G. Filters:

Filter section shall consist of field--installed, throw--away,

1--in. thick fiberglass filters of commercially available sizes.

D. Unit shall be UL listed and c--UL certified as a total

package for safety requirements.

H. Controls and Safeties:

E. Roof curb shall be designed to conform to NRCA

Standards.

F. Insulation and adhesives shall meet NFPA 90A

requirements for flame spread and smoke generation.

1. Unit controls shall be complete with self--contained low

voltage control circuit.

2. Units shall incorporate an internal compressor protector that

provides reset capability.

G. Cabinet insulation shall meet ASHRAE Standard 62P.

DELIVERY, STORAGE, AND HANDLING

3. Unit shall provide high-- and low--/loss--of--charge pressure

safety protection.

Unit shall be stored and handled per manufacturer’s recommen-

dations.

I. Operating Characteristics:

1. Unit shall be capable of starting and running at 125°F

(51.6_C) ambient outdoor temperature, exceeding maximum

load criteria of ARI Standard 240.

PART 2-- PRODUCTS

EQUIPMENT

A. General:

2. Compressor shall be capable of operation down to 55°F

(12.7_C) ambient outdoor temperature in cooling and --10°F

in heating.

Factory--assembled, single--piece, heat pump. Contained within

the unit enclosure shall be all factory wiring, piping, controls, re-

frigerant charge (R--410A), and special features required prior to

field start--up.

3. Unit shall be capable of low--ambient cooling (below 55_F

(12.7_C) ambient outdoor temperature) with low--ambient

cooling enabled on the UI.

B. Unit Cabinet:

1. Unit cabinet shall be constructed of phosphated, zinc--coated,

prepainted steel capable of withstanding 500 hrs of salt spray.

J. Electrical Requirements:

All unit power wiring shall enter unit cabinet at a single location.

2. Normal service shall be through a single removable cabinet

panel.

K. Motors:

1. Compressor motors shall be of the refrigerant--cooled type

with line--break thermal and current overload protection.

3. The unit shall be constructed on a rust proof unit base that has

an externally trapped, integrated sloped drain pan.

2. All fan motors shall have permanently lubricated bearingsand

inherent automatic--reset thermal overload protection.

4. Indoor fan compartment top surface shall be insulated with a

minimum 1/2--in. (13 mm) thick, flexible fiberglass

insulation, coated on the air side and retained by adhesive and

mechanical means. The indoor wall sections will be insulated

with a foil--faced insulation capable of being wiped clean.

Aluminum foil--faced fiberglass insulation shall be used in the

entire indoor air cavity section.

3. Outdoor fan motor shall be totally enclosed.

L. Grille

1. Louvered Grille:

Louvered grille shall be standard on all units.

5. Unit shall have a field--supplied condensate trap.

C. Fans:

1. The indoor fan shall be variable--speed motor and control, as

shown on equipment drawings.

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6. Filter Rack Kit:

GUIDE SPECIFICATIONS (CONT)

Shall provide filter mounting for downflow and horizontal

applications.

M. Special Features:

1. Coil Options:

7. Square--To--Round Duct Transitions:

Shall include factory--installed optional tin--plated indoor

copper/copper and vinyl--coated refrigerant coils.

Shall have the ability to convert the supply and return open-

ings from rectangular to round (024--048 sizes only).

2. Flat Roof Curb:

8. Crankcase Heater:

Curbs shall have seal strip and a wood nailer for flashing and

shall be installed per manufacturer’s instructions.

Shall provide anti--floodback protection for low--load cool-

ing applications. (Standard on 042--060 sizes.)

3. Manual Outdoor Air Damper:

9. Electric heaters:

Package shall consist of damper, bird screen, and rain hood

which can be preset to admit outdoor air for year--round ven-

tilation.

a. Electric heater shall be available as a field--installed

option.

b. Heater elements shall be open--wire type, adequately

supported and insulated with ceramic bushings.

c. Electric heater packages must provide single--point

power connection capability.

4. Infinityt User Interface:

Toprovidefortwo--stage heatpump heating, two--stagecool-

ing, and electric (auxiliary) heat, in addition to manual or au-

tomatic changeover and indoor fan control.

10. Compressor Hard Start Kit:

5. Low--Ambient Cooling:

Shall be available to give a boost to the compressor motor at

each start--up.

Low--ambient cooling must be enabled in the UI setup to al-

low unit to operate down to 0°F (--17_C) outdoor ambient

temperature in cooling.

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Catalog No: 50XT---04PD

Printed in U.S.A.

Edition Date: 06/08

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

Replaces: 50XT---3PD

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