INSTALLATION
INSTRUCTIONS
E 2011 Lennox Industries Inc.
Dallas, Texas, USA
Merit® Series 14ACX Units
CONDENSING UNITS
506645−01
07/11
Litho U.S.A.
Supersedes 11/10
TABLE OF CONTENTS
Model Number Identification . . . . . . . . . . . . . . . . . . . . . . 3
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
Shipping and Packing List
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox Engineering Handbook. Coils
previously charged with HCFC−22 must be flushed.
Check the unit for shipping damage and listed times below
are intact. If damaged, or if parts are missing, immediately
contact the last shipping carrier.
1 ꢀ Assembled outdoor unit
1 ꢀ Refrigerant flow control kit (fixed orifice)
1 ꢀ Liquid line filter drier
NOTICE TO INSTALLER
General
UNIT PLACEMENT
It is critical for proper unit operation to place outdoor unit on an
14ACX Air Conditioners, which will also be referred to in
this instruction as the outdoor unit, uses HFC−410A
refrigerant. This outdoor unit must be installed with a
matching indoor unit and line set as outlined in the Lennox
14ACX Engineering Handbook.
BRAZING LINE SET TO SERVICE VALVES
It is imperative to follow the brazing technique illustrated starting on
This outdoor unit is designed for use in systems that use
one of the following refrigerant metering devices:
S
S
Thermal expansion valve (TXV)
Fixed orifice
07/11
506645−01
Page 1
*2P0711*
*P506645-01*
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Typical Unit Parts Arrangement
NOTE ꢀ Plumbing layout and compressor type may vary between model sizes.
CONTROL
THERMAL SWITCH
COMPRESS0R (B1)
(S173) (−036 AND
−060 ONLY)
DUAL RUN
CAPACITOR
(C12)
GROUND LUG
DISCHARGE LINE
COMPRESSOR
HARNESS
CONNECTION
CONTACTOR
(K1)
OUTDOOR COIL
CUTOUT FOR HIGH
VOLTAGE CONDUIT
CONTROL WIRE
LOOP
CRANKCASE HEATER
SEE NOTE
THERMOSTAT (S40)
CRANKCASE HEATER
SEE NOTE
(HR1)
SUCTION LINE SERVICE VALVE
LIQUID LINE SERVICE VALVE
HIGH PRESSURE SWITCH (S4)
NOTE ꢀ− −041, −047, −048, −059 and −060 only are equipped with crankcase thermostat (S40) and
crankcase heater (HR1).
Figure 1. Typical Unit Parts Arrangement
Model Number Identification
14 AC X −024 −
−13
230
Minor Revision Number
Nominal SEER
Unit Type
Voltage
230 = 208/230V−1phase−60hz
Cooling Capacity − Tons
AC = Air Conditioner
018 = 1.5
024 = 2
030 = 2.5
036 = 3
041 = 3.5
042 = 3.5
047 = 4
048 = 4
059 = 5
060 = 5
Refrigerant
X = R−410A
Page 3
14ACX SERIES
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CAUTION
IMPORTANT
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.
When servicing or repairing HVAC components, ensure
torque values for fasteners.
Table 1. Torque Requirements
Operating Manifold Gauge Set and
Service Valves
Parts
Recommended Torque
Service valve cap
Sheet metal screws
Machine screws #10
Compressor bolts
Gauge port seal cap
8 ft.− lb.
11 NM
16 in.− lb.
28 in.− lb.
90 in.− lb.
8 ft.− lb.
2 NM
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
3 NM
10 NM
11 NM
TORQUE REQUIREMENTS
USING MANIFOLD GAUGE SET
When servicing or repairing heating, ventilating, and air
conditioning components, ensure the fasteners are
fasteners.
When checking the system charge, only use a manifold
gauge set that features low loss anti−blow back fittings.
Manifold gauge set used with HFC−410A refrigerant
systems must be capable of handling the higher system
operating pressures. The gauges should be rated for use
with pressures of 0 − 800 psig on the high side and a low
side of 30" vacuum to 250 psig with dampened speed to
500 psi. Gauge hoses must be rated for use at up to 800
psig of pressure with a 4000 psig burst rating.
IMPORTANT
Only use Allen wrenches of sufficient hardness (50Rc −
Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.
Service valve stems are factory−torqued (from 9 ft−lbs for
small valves, to 25 ft−lbs for large valves) to prevent
refrigerant loss during shipping and handling. Using an
Allen wrench rated at less than 50Rc risks rounding or
breaking off the wrench, or stripping the valve stem
recess.
OPERATING SERVICE VALVES
The liquid and vapor line service valves are used for
removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging.
Each valve is equipped with a service port which has a
on how to access and operating both angle and ball service
valves.
See the Lennox Service and Application Notes #C−08−1
for further details and information.
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506645−01
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Operating Angle Type Service Valve:
1. Remove stem cap with an appropriately sized wrench.
2. Use a service wrench with a hex−head extension (3/16" for liquid line valve sizes and 5/16" for vapor line valve sizes) to back
the stem out counterclockwise as far as it will go.
SERVICE PORT CAP
SERVICE PORT CORE
(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE
TO INDOOR
UNIT
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
SERVICE PORT
CORE
STEM CAP
TO OUTDOOR UNIT
ANGLE−TYPE SERVICE VALVE
(FRONT−SEATED CLOSED)
ANGLE−TYPE SERVICE VALVE
(BACK−SEATED OPENED)
When service valve is OPEN, the service port is
open to linE set, indoor and outdoor unit.
WHEN SERVICE VALVE IS CLOSED, THE SERVICE PORT IS OPEN
TO THE LINE SET AND INDOOR UNIT.
To Access Service Port:
Operating Ball Type Service Valve:
A service port cap protects the service port core from contamination and
serves as the primary leak seal.
1. Remove stem cap with an appropriately sized wrench.
2. Use an appropriately sized wrenched to open. To open valve,
rotate stem counterclockwise 90°. To close rotate stem
clockwise 90°.
1. Remove service port cap with an appropriately sized wrench.
2. Connect gauge set to service port.
3. When testing is completed, replace service port cap and tighten as
follows:
TO INDOOR UNIT
1/6 TURN
S
S
With torque wrench: Finger tighten and
12
6
1
5
11
10
Without torque wrench: Finger tighten and
use an appropriately sized wrench to turn
an additional 1/6 turn clockwise.
2
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
9
3
BALL (SHOWN
CLOSED)
4
8
7
VALVE
TO CLOSE ROTATE STEM
STEM
Reinstall Stem Cap:
CLOCKWISE 90°.
Stem cap protects the valve stem from damage and serves as the
primary seal. Replace the stem cap and tighten as follows:
SERVICE PORT
1/12 TURN
SERVICE PORT
CORE
S
S
With Torque Wrench: Finger tighten and
12
6
1
5
11
10
SERVICE PORT
CAP
Without Torque Wrench: Finger tight-
en and use an appropriately sized
wrench to turn an additional 1/12 turn
clockwise.
2
9
3
STEM CAP
4
TO OUTDOOR
UNIT
8
7
NOTE ꢀ A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.
Figure 2. Angle and Ball Service Valves
Page 5
14ACX SERIES
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Recovering Refrigerant from Existing System
Use the following procedure to recover refrigerant from an existing system (indoor coil, line set and outdoor unit).
CONNECT MANIFOLD GAUGE SET
DISCONNECT POWER
Disconnect all power to the existing outdoor unit at the service
Connect a gauge set, clean recovery cylinder and a recovery
machine to the service ports of the existing unit. Use the
instructions provided with the recovery machine to make the
connections.
1
2
disconnect switch or main fuse box/breaker panel.
MAIN FUSE BOX/BREAKER PANEL
MANIFOLD GAUGES
RECOVERY MACHINE
SERVICE
DISCONNECT
SWITCH
LOW
HIGH
OUTDOOR UNIT
CLEAN RECOVERY
CYLINDER
RECOVERING REFRIGERANT
Remove existing HCFC−22 refrigerant using one of the following procedures:
3
IMPORTANT ꢀ Some system configurations may contain higher than normal refrigerant charge due to either large internal coil volumes,
and/or long line sets.
METHOD 1:
Us this method if the existing outdoor unit is not equipped with shut−off valves, or if the unit is not operational and you plan to use the existing
HCFC−22 to flush the system.
Remove all HCFC−22 refrigerant from the existing system. Check gauges after shutdown to confirm that the entire system is completely void of
refrigerant.
METHOD 2:
Use this method if the existing outdoor unit is equipped with manual shut−off valves, and you plan to use new HCFC−22 refrigerant to flush the
system.
The following devices could prevent full system charge recovery into the outdoor unit:
S
S
S
Outdoor unit’s high or low−pressure switches (if applicable) when tripped can cycle the compressor OFF.
Compressor can stop pumping due to tripped internal pressure relief valve.
Compressor has internal vacuum protection that is designed to unload the scrolls (compressor stops pumping) when the pressure ratio meets
a certain value or when the suction pressure is as high as 20 psig. (Compressor suction pressures should never be allowed to go into a vacuum.
Prolonged operation at low suction pressures will result in overheating of the scrolls and permanent damage to the scroll tips, drive bearings and
internal seals.)
Once the compressor can not pump down to a lower pressure due to one of the above system conditions, shut off the vapor valve. Turn OFF the
main power to unit and use a recovery machine to recover any refrigerant left in the indoor coil and line set.
Perform the following task:
A
B
Start the existing HCFC−22 system in the cooling mode and close the liquid line valve.
Use the compressor to pump as much of the existing HCFC−22 refrigerant into the outdoor unit until the outdoor system is full. Turn the outdoor unit
main power OFF and use a recovery machine to remove the remaining refrigerant from the system.
NOTE ꢀ It may be necessary to bypass the low pressure switches (if equipped) to ensure complete refrigerant evacuation.
C
D
When the low side system pressures reach 0 psig, close the vapor line valve.
Check gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system.
Figure 3. Refrigerant Recovery Procedure
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506645−01
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MINIMUM CLEARANCE
ABOVE UNIT
CLEARANCE ON ALL SIDES ꢀ INCHES (MILLIMETERS)
6 (152)
ACCESS PANEL
NOTES:
48 (1219)
S
Clearance to one of the other three
sides must be 36 inches (914mm).
30 (762)
12 (305)
S
Clearance to one of the remaining
two sides may be 12 inches
(305mm) and the final side may be
6 inches (152mm).
LINE SET
CONNECTIONS
36 (914)
MINIMUM CLEARANCE BETWEEN
TWO UNITS
ACCESS PANEL
24 (610)
LINE SET
CONNECTIONS
Figure 4. Installation Clearances
DETAIL B
Install unit level or, if on a slope, maintain slope tolerance of 2 degrees
(or 2 inches per 5 feet [50 mm per 1.5 m]) away from building structure.
DETAIL A
INSTALL UNIT AWAY
FROM WINDOWS
DISCHARGE AIR
BUILDING
STRUCTURE
MOUNTING
SLAB
TWO 90_ ELBOWS INSTALLED IN LINE SET
WILL REDUCE LINE SET VIBRATION
GROUND LEVEL
Figure 5. Placement, and Slab Mounting
Consider the following when positioning the unit:
New Unit Placement
S
Some localities are adopting sound ordinances based
on the unit’s sound level registered from the adjacent
property, not from the installation property. Install the
unit as far as possible from the property line.
installation clearance requirements.
POSITIONING CONSIDERATIONS
S
When possible, do not install the unit directly outside
a window. Glass has a very high level of sound
transmission. For proper placement of unit in relation
to a window see the provided illustration in figure 5,
detail A.
CAUTION
In order to avoid injury, take proper precaution when
lifting heavy objects.
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14ACX SERIES
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PLACING UNIT ON SLAB
When installing unit at grade level, the top of the slab
should be high enough above grade so that water from
higher ground will not collect around the unit. The slab
should have a slope tolerance as described in figure 5,
detail B.
NOTICE
Roof Damage!
This system contains both refrigerant and oil. Some
rubber roofing material may absorb oil and cause the
rubber to swell when it comes into contact with oil. The
rubber will then bubble and could cause leaks. Protect
the roof surface to avoid exposure to refrigerant and oil
during service and installation. Failure to follow this
notice could result in damage to roof surface.
ROOF MOUNTING
Install the unit at a minimum of 4 inches (102 mm) above
the surface of the roof. Ensure the weight of the unit is
properly distributed over roof joists and rafters. Redwood
or steel supports are recommended.
Removing and Installing Louvers
WARNING
To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following:
While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause injury to personnel,
nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g., being bent or scratched).
While handling or stowing the panels, consider any weather conditions, especially windy conditions, that may cause panels to be blown
around and battered.
PANEL B
PANEL C
When removing the unit panels. Remove panel A first, then B, C and
finally D. When reinstalling panels, reverse that order starting with panel
D, C, B and finally A.
REMOVAL
WARNING
PANEL A
STEP 1
TO REMOVE PANEL,
PANEL D
REMOVE MOUNTING
SCREWS SECURING
PANEL TO THE UNIT.
INSTALLATION
STEP 1
STARTING WITH PANEL D,
INSERT PANEL UNDER UNIT
TOP CAP LIP AND LIFT
TOP CAP
PANEL A
SLIGHTLY TO CLEAR SIDE LIP
OF PANEL FROM BASE.
STEP 2
SLIGHTLY LIFT PANEL A IN
ORDER TO CLEAR SIDE
LIPS OF PANEL FROM
BASE OF UNIT.
STEP 2
MOVE PANEL IN TOWARDS UNIT.
ALIGN LEFT/RIGHT SIDE LIPS OF
PANEL WITH GROOVE INSERTS
ALONG LEFT/RIGHT SIDE OF UNIT.
STEP 3
TILT PANEL OUT SLIGHTLY
AND PULL DOWNWARD
TO REMOVE.
SIDE
GROOVE
REPEAT STEPS 1, 2 AND
3 TO REMOVE PANELS B,
C AND FINALLY D.
STEP 3
SECURE PANEL, WITH
MOUNTING SCREWS.
REPEAT STEPS 1 AND 2 TO
INSTALL PANELS C, B AND
FINALLY A.
PANEL A
BASE
PANEL D
Figure 6. Louvers
Page 8
506645−01
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Recommended topping−off POE oils are Mobil EAL
ARCTIC 22 CC or ICI EMKARATEt RL32CF.
New or Replacement Line Set
This section provides information on new installation or
replacement of existing line set. If a new or replacement
line set is not required, then proceed to Brazing
MATCHING WITH NEW OR EXISTING INDOOR COIL
AND LINE SET
The RFC1−metering line consisted of a small bore copper
line that ran from condenser to evaporator coil. Refrigerant
was metered into the evaporator by utilizing
temperature/pressure evaporation effects on refrigerant in
the small RFC line. The length and bore of the RFC line
corresponded to the size of cooling unit.
Field refrigerant piping consists of liquid and suction lines
from the outdoor unit (braze connections) to the indoor unit
coil (flare or braze connections). Use Lennox L15 (braze,
non−flare) series line set, or use field−fabricated refrigerant
lines as listed in table 2.
If the 14ACX is being used with either a new or existing
indoor coil which is equipped with a liquid line which served
as a metering device (RFCI), the liquid line must be
replaced prior to the installation of the 14ACX unit.
Typically a liquid line used to meter flow is 1/4" in diameter
and copper.
NOTE − When installing refrigerant lines longer than 50
feet, see the Lennox Refrigerant Piping Design and
Fabrication Guidelines, CORP. 9351−L9, or contact
Lennox Technical Support Product Applications for
assistance.
To obtain the correct information from Lennox, be sure to
communicate the following points:
LIQUID LINE FILTER DRIER INSTALLATION
The filter drier (one is shipped with each 14ACX unit) must
be field installed in the liquid line between the outdoor unit’s
liquid line service valve and the indoor coil’s metering
device (fixed orifice or TXV) as illustrated in figure 7. This
filter drier must be installed to ensure a clean,
moisture−free system. Failure to install the filter drier will
void the warranty. A replacement filter drier is available
special procedures on brazing filter drier connections to
the liquid line.
S
S
Model (14ACX) and size of unit (e.g. −060).
Line set diameters for the unit being installed as listed
S
Number of elbows and if there is a rise or drop of the
piping.
If refrigerant lines are routed through a wall, seal and
isolate the opening so vibration is not transmitted to the
building. Pay close attention to line set isolation during
installation of any HVAC system. When properly isolated
from building structures (walls, ceilings. floors), the
refrigerant lines will not create unnecessary vibration and
subsequent sounds.
BRAZE CONNECTION POINTS
IMPORTANT
Mineral oils are not compatible with HFC−410A. If oil
must be added, it must be a Polyol ester oil.
LIQUID
LINE
LIQUID LINE
LINE
SERVICE VALVE
LIQUID LINE
FILTER DRIER
The compressor is charged with sufficient Polyol ester oil
for line set lengths up to 50 feet. Recommend adding oil to
system based on the amount of refrigerant charge in the
system. No need to add oil in system with 20 pounds of
refrigerant or less. For systems over 20 pounds − add one
ounce of every five pounds of refrigerant.
OUTDOOR
UNIT
Figure 7. Typical Liquid Line Filter Drier Installation
Table 2. Refrigerant Line Set ꢀ Inches (mm)
Valve Field Size Connections
Model Number
Recommended Line Set
Liquid Line
Suction Line
Liquid Line
Suction Line
L15 Series Line Sets
14ACX−018−230
14ACX−024−230
14ACX−030−230
14ACX−036−230
14ACX−041−230
14ACX−042−230
14ACX−047−230
14ACX−048−230
14ACX−059−230
14ACX−060−230
L15−41 ꢀ 15 feet to 50 feet (4.6 meters to
15 meters)
3/8 in. (10 mm)
3/4 in. (19 mm)
3/8 in. (10 mm)
3/4 in. (19 mm)
L15−65 ꢀ 15 feet to 50 feet (4.6 meters to
15 meters)
3/8 in. (10 mm)
3/8 in. (10 mm)
7/8 in. (22 mm)
3/8 in. (10 mm)
3/8 in. (10 mm)
7/8 in. (22 mm)
1−1/8 in. (29 mm)
1−1/8 in. (29 mm)
Field Fabricated
NOTE ꢀ Some applications may required a field provided 7/8" to 1−1/8" adapter
Page 9
14ACX SERIES
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IMPORTANT ꢀ Refrigerant lines must not contact structure.
LINE SET
Line Set Isolation ꢀ The following illustrations are
examples of proper refrigerant line set isolation:
INSTALLATION
REFRIGERANT LINE SET ꢀ INSTALLING
VERTICAL RUNS (NEW CONSTRUCTION SHOWN)
NOTE ꢀ Insulate liquid line when it is routed through areas where the
surrounding ambient temperature could become higher than the
temperatureof the liquid line or when pressure drop is equal to or greater
than 20 psig.
REFRIGERANT LINE SET ꢀ TRANSITION
FROM VERTICAL TO HORIZONTAL
ANCHORED HEAVY NYLON
IMPORTANT ꢀ Refrigerant lines must not contact wall
WIRE TIE OR AUTOMOTIVE
MUFFLER-TYPE HANGER
AUTOMOTIVE
MUFFLER-TYPE HANGER
OUTSIDE WALL
LIQUID LINE
VAPOR LINE
WALL
STUD
WIRE TIE
INSIDE WALL
STRAP
WOOD BLOCK
BETWEEN STUDS
STRAP LIQUID LINE TO
VAPOR LINE
NON−CORROSIVE
METAL SLEEVE
WIRE TIE
LIQUID LINE
NON−CORROSIVE
METAL SLEEVE
WOOD BLOCK
WIRE TIE
VAPOR LINE − WRAPPED
IN ARMAFLEX
STRAP
REFRIGERANT LINE SET ꢀ INSTALLING
HORIZONTAL RUNS
SLEEVE
To hang line set from joist or rafter, use either metal strapping material
or anchored heavy nylon wire ties.
WIRE TIE (AROUND
VAPOR LINE ONLY)
VAPOR LINE WRAPPED
WITH ARMAFLEX
8 FEET (2.43 METERS)
OUTSIDE
WALL
STRAPPING
MATERIAL (AROUND
VAPOR LINE ONLY)
FLOOR JOIST OR
LIQUID
LINE
ROOF RAFTER
TAPE OR
WIRE TIE
8 FEET (2.43 METERS)
PVC
PIPE
CAULK
NON−CORROSIVE
METAL SLEEVE
FIBERGLASS
INSULATION
STRAP THE VAPOR LINE TO THE JOIST
OR RAFTER AT 8 FEET (2.43 METERS)
INTERVALS THEN STRAP THE LIQUID
LINE TO THE VAPOR LINE.
TAPE OR
WIRE TIE
NOTE ꢀ Similar installation practices should be used if line set is
to be installed on exterior of outside wall.
FLOOR JOIST OR
ROOF RAFTER
Figure 8. Line Set Installation Guidelines
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Brazing Connections
line set connections to service valves.
IMPORTANT
Connect gauge set low pressure side to vapor line
service valve and repeat procedure starting at
paragraph 4 for brazing the liquid line to service port
valve.
IMPORTANT
Polyol ester (POE) oils used with HFC−410A
refrigerant absorb moisture very quickly. It is very
important that the refrigerant system be kept closed
as much as possible. DO NOT remove line set caps
or service valve stub caps until you are ready to make
connections.
IMPORTANT
Allow braze joint to cool before removing the wet rag
from the service valve. Temperatures above 250ºF can
damage valve seals.
WARNING
IMPORTANT
Use silver alloy brazing rods with 5% minimum silver
alloy for copper−to−copper brazing. Use 45% minimum
alloy for copper−to−brass and copper−to−steel brazing.
Danger of fire. Bleeding the refrigerant
charge from only the high side may result
in pressurization of the low side shell and
suction tubing. Application of a brazing
torch to a pressurized system may result
in ignition of the refrigerant and oil
mixture − Check the high and low
pressures before applying heat.
WARNING
Fire, Explosion and Personal Safety
Hazard.
WARNING
Failure to follow this warning could
result in damage, personal injury or
death.
When using a high pressure gas such as
dry nitrogen to pressurize a refrigeration
or air conditioning system, use a
regulator that can control the pressure
down to 1 or 2 psig (6.9 to 13.8 kPa).
Never use oxygen to pressurize or
purge refrigeration lines. Oxygen,
when exposed to a spark or open
flame, can cause fire and/or an ex-
plosion, that could result in property
damage, personal injury or death.
CAUTION
Brazing alloys and flux contain materials which are
hazardous to your health.
Avoid breathing vapors or fumes from brazing
operations. Perform operations only in well−ventilated
areas.
Wear gloves and protective goggles or face shield to
protect against burns.
Wash hands with soap and water after handling brazing
alloys and flux.
Page 11
14ACX SERIES
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CAP AND CORE REMOVAL
CUT AND DEBUR
Cut ends of the refrigerant lines square (free from nicks or dents)
and debur the ends. The pipe must remain round. Do not crimp end
of the line.
Remove service cap and core from
both the suction / vapor and liquid line
service ports.
2
1
CUT AND DEBUR
SERVICE PORT
CAP
SERVICE
PORT
CORE
LINE SET SIZE MATCHES
SERVICE VALVE CONNECTION
SERVICE
PORT
CORE
SERVICE VALVE
CONNECTION
SERVICE
PORT CAP
COPPER TUBE
STUB
LIQUID LINE SERVICE
VALVE
SUCTION / VAPOR LINE
SERVICE VALVE
REDUCER
LINE SET SIZE IS SMALLER
THAN CONNECTION
DO NOT CRIMP SERVICE VALVE
CONNECTOR WHEN PIPE IS
SMALLER THAN CONNECTION
REFRIGERANT LINE
ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE
VALVES
3
Flow regulated nitrogen (at 1 to 2 psig) through the low−side refrigeration gauge set into the liquid line service port valve, and out of the suction /
vapor line service port valve.
A
B
C
Connect gauge set low pressure side to
liquid line service valve (service port).
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
LOW
HIGH
Connect gauge set center port to bottle of
nitrogenwith regulator.
Remove core from valve in suction / vapor
line service port to allow nitrogen to escape.
ATTACH
GAUGES
B
SUCTION / VAPOR SERVICE PORT MUST BE
OPEN TO ALLOW EXIT POINT FOR NITROGEN
SUCTION /
VAPOR LINE
SERVICE
VALVE
C
VAPOR LINE
OUTDOOR
UNIT
INDOOR
UNIT
NITROGEN
LIQUID LINE SERVICE
VALVE
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
LIQUID LINE
A
Figure 9. Brazing Procedures
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WRAP SERVICE VALVES
To help protect service valve seals during brazing, wrap water saturated cloths around service valve bodies and copper tube stubs. Use
additionalwater saturated cloths underneath the valve body to protect the base paint.
4
FLOW NITROGEN
Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and
out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections
5
6
BRAZE LINE SET
Wrap both service valves with water saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Water
saturated cloths must remain water saturated throughout the brazing and cool−down process.
LIQUID LINE SERVICE VALVE
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
IMPORTANT ꢀ Allow braze joint to cool. Apply
additional water saturated cloths to help cool brazed
joint. Do not remove water saturated cloths until piping
has cooled. Temperatures above 250ºF will damage
valve seals.
WATER SATURATED
CLOTH
LIQUID LINE
WARNING
SUCTION / VAPOR LINE
SERVICE VALVE
1. FIRE, PERSONAL INJURY, OR PROPERTY
DAMAGE will result if you do not wrap a water
saturated cloth around both liquid and suction line
service valve bodies and copper tube stub while
brazing in the line set! The braze, when complete,
must be quenched with water to absorb any residual
heat.
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
2. Do not open service valves until refrigerant lines and
indoor coil have been leak−tested and evacuated.
Refer to procedures provided in this supplement.
SUCTION / VAPOR LINE
WATER SATURATED
CLOTH
PREPARATION FOR NEXT STEP
After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water saturated cloths to both
services valves to cool piping. Once piping is cool, remove all water saturated cloths. Refer to the unit installation instructions for the next step
in preparing the unit.
7
Figure 10. Brazing Procedures (continued)
Page 13
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Flushing Line Set and Indoor Coil
Flushing is only required if existing indoor coil and line set are to be used. Otherwise proceed to Installing Indoor Metering
TYPICAL EXISTING FIXED ORIFICE
REMOVAL PROCEDURE (UNCASED
COIL SHOWN)
TYPICAL EXISTING EXPANSION VALVE REMOVAL
PROCEDURE (UNCASED COIL SHOWN)
OR
1B
1A
STUB END
TWO PIECE PATCH PLATE
(UNCASED COIL ONLY)
LIQUID LINE
ORIFICE
HOUSING
CHECK
EXPANSION
VALVE
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR
TUBES
®
TEFLON
RING
®
TEFLON RING
FIXED ORIFICE
BRASS NUT
®
TEFLON
RING
SENSING
LINE
DISTRIBUTOR
ASSEMBLY
DISTRIBUTOR
ASSEMBLY
EQUALIZER
LINE
REMOVE AND DISCARD
®
WHITE TEFLON SEAL
(IF PRESENT)
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
A
B
On fully cased coils, remove the coil access and plumbing panels.
Remove any shipping clamps holding the liquid line and distributor as-
sembly.
MALE EQUALIZER
LINE FITTING
VAPOR
LINE
C
Using two wrenches, disconnect liquid line from liquid line orifice hous-
ing. Take care not to twist or damage distributor tubes during this pro-
cess.
LIQUID
LINE
SENSING BULB
A
B
On fully cased coils, remove the coil access and plumbing panels.
D
E
Remove and discard fixed orifice, valve stem assembly if present and
®
Teflon washer as illustrated above.
Remove any shipping clamps holding the liquid line and distributor
assembly.
Use a field−provided fitting to temporary reconnect the liquid line to the
indoor unit’s liquid line orifice housing.
C
Disconnect the equalizer line from the check expansion valve
equalizer line fitting on the vapor line.
D
E
Remove the vapor line sensing bulb.
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
Disconnect the liquid line from the check expansion valve at the liquid
line assembly.
2
INVERTED HCFC−22
GAUGE
MANIFOLD
F
Disconnect the check expansion valve from the liquid line orifice
housing.Take care not to twist or damage distributor tubes during this
process.
CYLINDER CONTAINS
CLEAN HCFC−22 TO BE
USED FOR FLUSHING.
A
®
G
H
Remove and discard check expansion valve and the two Teflon rings.
LOW
HIGH
1
Use a field−provided fitting to temporary reconnect the liquid line to the
indoor unit’s liquid line orifice housing.
NEW
OUTDOOR
UNIT
VAPOR LINE
SERVICE VALVE
FLUSHING LINE SET
The line set and indoor unit coil must be flushed with at least the
same amount of clean refrigerant that previously charged the
system. Check the charge in the flushing cylinder before
proceeding.
OPENED
CLOSED
3
EXISTING
INDOOR
UNIT
B
LIQUID LINE SERVICE
VALVE
A
Set the recovery machine for liquid recovery and start the
recovery machine. Open the gauge set valves to allow the
recovery machine to pull a vacuum on the existing system line
TANK
RETURN
set and indoor unit coil.
B
B
Invert the cylinder of clean HCFC−22 and open its valve to allow
liquid refrigerant to flow into the system through the vapor line
valve. Allow the refrigerant to pass from the cylinder and through
the line set and the indoor unit coil before it enters the recovery
machine.
C
INLET
D
RECOVERY
CYLINDER
DISCHARGE
RECOVERY MACHINE
C
D
After all of the liquid refrigerant has been recovered, switch the
recovery machine to vapor recovery so that all of the HCFC−22
vapor is recovered. Allow the recovery machine to pull down to 0
the system.
A
Inverted HCFC−22 cylinder with clean refrigerant to the vapor service
valve.
B
C
HCFC−22 gauge set (low side) to the liquid line valve.
HCFC−22 gauge set center port to inlet on the recovery machine with an
empty recovery tank to the gauge set.
Close the valve on the inverted HCFC−22 drum and the gauge
set valves. Pump the remaining refrigerant out of the recovery
machine and turn the machine off.
D
Connect recovery tank to recovery machines per machine instructions.
Figure 11. Removing Metering Device and Flushing
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Installing Indoor Metering Device
This outdoor unit is designed for use in systems that use
either an fixed orifice (RFC) (included with outdoor unit), or
expansion valve metering device (purchased separately)
at the indoor coil.
coil. In applications where an uncased coil is being
installed in a field−provided plenum, install the expansion
valve in a manner that will provide access for field servicing
of the expansion valve. Refer to below illustration for
reference during installation of expansion valve unit. .
See the Lennox 14ACX Engineering Handbook for
approved expansion valve kit match ups. The expansion
valve unit can be installed internal or external to the indoor
After installation of the indoor coil metering device,
1/2 Turn
A
B
Remove the field−provided fitting that temporary
reconnectedthe liquid line to the indoor unit’s distributor
assembly.
INDOOR EXPANSION VALVE INSTALLATION
TWO PIECE
12
PATCH PLATE
(Uncased Coil Shown)
1
11
10
®
(UNCASED
STUB
END
2
Install one of the provided Teflon rings around the
stubbed end of the expansion valve and lightly lubricate
LIQUID LINE
ORIFICE
COIL ONLY)
9
3
EXPANSION
VALVE
4
8
®
the connector threads and expose surface of the Teflon
ring with refrigerant oil.
HOUSING
5
7
6
DISTRIBUTOR
TUBES
®
TEFLON
RING
C
D
E
Attach the stubbed end of the expansion valve to the
liquid line orifice housing. Finger tighten and use an
appropriatelysized wrench to turn an additional 1/2 turn
clockwise as illustrated in the figure above, or 20 ft−lb.
®
®
Place the remaining Teflon washer around the other
end of the expansion valve. Lightly lubricate connector
TEFLON
RING
SENSING
LINE
®
threads and expose surface of the Teflon ring with
refrigerantoil.
DISTRIBUTOR
ASSEMBLY
EQUALIZER
LINE
Attach the liquid line assembly to the expansion valve.
Finger tighten and use an appropriately sized wrench to
turn an additional 1/2 turn clockwise as illustrated in the
figure above or 20 ft−lb.
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
SENSING BULB INSTALLATION
A
Attach the vapor line sensing bulb in the proper
orientationas illustrated to the right using the clamp and
screws provided.
1/8 Turn
MALE EQUALIZER LINE
FITTING (SEE
VAPOR
LINE
EQUALIZER LINE
INSTALLATION FOR
FURTHER DETAILS)
NOTE ꢀ Confirm proper thermal contact between vapor line
and expansion bulb before insulating the sensing bulb once
installed.
12
1
5
11
10
2
LIQUID LINE
9
3
4
8
B
Connect the equalizer line from the expansion valve to
the equalizer vapor port on the vapor line. Finger tighten
the flare nut plus 1/8 turn (7 ft−lbs) as illustrated below.
7
Sensing bulb insulation is required if
mountedexternal to the coil casing. sensing
bulb installation for bulb positioning.
6
ON LINES SMALLER THAN
7/8", MOUNT SENSING
BULB AT EITHER THE 3 OR
9 O’CLOCK POSITION.
VAPOR LINE
EQUALIZER LINE INSTALLATION
A
Remove and discard either the flare seal cap or flare nut
with copper flare seal bonnet from the equalizer line port
on the vapor line as illustrated in the figure to the right.
12
BULB
BULB
B
Remove and discard either the flare seal cap or flare nut
with copper flare seal bonnet from the equalizer line port on
the vapor line as illustrated in the figure to the right.
FLARE SEAL CAP
FLARE NUT
VAPOR LINE
ON 7/8" AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O’CLOCK
POSITION. NEVER MOUNT ON
BOTTOM OF LINE.
COPPER FLARE
SEAL BONNET
OR
12
MALE BRASS EQUALIZER
LINE FITTING
BULB
BULB
NOTE ꢀ NEVER MOUNT ON BOTTOM OF LINE.
VAPOR LINE
Figure 12. Installing Indoor Expansion Valve
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Leak Test Line Set and Indoor Coil
IMPORTANT
The Environmental Protection Agency (EPA) prohibits
the intentional venting of HFC refrigerants during
maintenance, service, repair and disposal of appliance.
Approved methods of recovery, recycling or reclaiming
must be followed.
IMPORTANT
Leak detector must be capable of sensing HFC
refrigerant.
After completing the leak testing the line set and indoor coil
IMPORTANT
WARNING
If this unit is being matched with an approved line set
or indoor unit coil which was previously charged with
mineral oil, or if it is being matched with a coil which
was manufactured before January of 1999, the coil
and line set must be flushed prior to installation. Take
care to empty all existing traps. Polyol ester (POE) oils
are used in Lennox units charged with HFC−410A
refrigerant. Residual mineral oil can act as an
insulator, preventing proper heat transfer. It can also
clog the expansion device, and reduce the system
performance and capacity.
When using a high pressure gas such as
dry nitrogen to pressurize a refrigeration
or air conditioning system, use a
regulator that can control the pressure
down to 1 or 2 psig (6.9 to 13.8 kPa).
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to properly flush the system per the
instructions below will void the warranty.
Failure to follow this warning may result in personal injury
or death.
CONNECT GAUGE SET
A
Connect an HFC−410A manifold gauge set high pressure
hose to the vapor valve service port.
LOW
HIGH
MANIFOLD GAUGE SET
1
NOTE ꢀ Normally, the high pressure hose is connected to
the liquid line port. However, connecting it to the vapor port
better protects the manifold gauge set from high pressure
damage.
OUTDOOR UNIT
B
With both manifold valves closed, connect the cylinder of
HFC−410A refrigerant to the center port of the manifold gauge
set.
NOTE ꢀ Later in the procedure,
the HFC−410A container will be
replaced by the nitrogen
container.
A
B
TO VAPOR
SERVICE VALVE
NITROGEN
HFC−410A
TEST FOR LEAKS
After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the
following procedure to test for leaks:
2
A
With both manifold valves closed, connect the cylinder of HFC−410A refrigerant to the center port of the manifold gauge set. Open the valve
on the HFC−410A cylinder (vapor only).
B
Open the high pressure side of the manifold to allow HFC−410A into the line set and indoor unit. Weigh in a trace amount of HFC−410A. [A
trace amount is a maximum of two ounces (57 g) refrigerant or three pounds (31 kPa) pressure]. Close the valve on the HFC−410A cylinder
and the valve on the high pressure side of the manifold gauge set. Disconnect the HFC−410A cylinder.
C
D
Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.
Adjust dry nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set
and the indoor unit.
E
F
After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak
detector.
After leak testing disconnect gauges from service ports.
Figure 13. Leak Test
Page 16
506645−01
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Evacuating Line Set and Indoor Coil
CONNECT GAUGE SET
NOTE ꢀ Remove cores from service valves (if not already done).
LOW
HIGH
1
A
Connect low side of manifold gauge set
with 1/4 SAE in−line tee to vapor line
service valve
B
C
D
Connect high side of manifold gauge
set to liquid line service valve
OUTDOOR
UNIT
MANIFOLD
GAUGE SET
A34000 1/4 SAE TEE WITH
SWIVEL COUPLER
Connect micron gauge available
connector on the 1/4 SAE in−line tee.
Connect the vacuum pump (with
vacuum gauge) to the center port of the
manifold gauge set. The center port
line will be used later for both the
HFC−410A and nitrogen containers.
A
500
MICRON
GAUGE
C
TO VAPOR
SERVICE VALVE
NITROGEN
HFC−410A
B
VACUUM PUMP
TO LIQUID LINE
SERVICE VALVE
D
EVACUATE THE SYSTEM
RECOMMEND
MINIMUM 3/8" HOSE
A
B
Open both manifold valves and start the vacuum pump.
Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).
2
NOTE ꢀ During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure
indicates a relatively large leak. If this occurs, repeat the leak testing procedure.
NOTE ꢀ The term absolute pressure means the total actual pressure within a given volume or system, above the absolute zero of
pressure. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.
C
When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following:
S
S
S
S
S
S
S
Close manifold gauge valves
Close valve on vacuum pump
Turn off vacuum pump
Disconnect manifold gauge center port hose from vacuum pump
Attach manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose.
Open manifold gauge valves to break the vacuum in the line set and indoor unit.
Close manifold gauge valves.
D
E
Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the
dry nitrogen from the line set and indoor unit.
Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the
absolutepressure does not rise above 500 microns (29.9 inches of mercury) within a 20−minute period after shutting off the vacuum pump
and closing the manifold gauge valves.
When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to an
F
upright cylinder of HFC−410A refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and
indoor unit.
Perform the following:
G
1/6 TURN
S
S
S
Close manifold gauge valves.
Shut off HFC−410A cylinder.
12
1
5
11
7
2
4
10
Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core
tool while maintaining a positive system pressure.
9
3
8
S
Replace stem caps and secure finger tight, then tighten an additional one−sixth (1/6) of a turn as illustrated.
6
Figure 14. Evacuating System
Page 17
14ACX SERIES
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defined as any gas that will not condense under
temperatures and pressures present during operation of
an air conditioning system. Non−condensables and water
suction combine with refrigerant to produce substances
that corrode copper piping and compressor parts.
WARNING
Danger of Equipment Damage. Avoid deep vacuum
operation. Do not use compressors to evacuate a
system. Extremely low vacuums can cause internal
arcing and compressor failure. Damage caused by
deep vacuum operation will void warranty.
IMPORTANT
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
capable of accurately measuring down to 50 microns.
CAUTION
Brazing alloys and flux contain materials which are
hazardous to your health.
Electrical
In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).
Avoid breathing vapors or fumes from brazing
operations. Perform operations only in well ventilated
areas.
Refer to the furnace or air handler installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
Wear gloves and protective goggles or face shield to
protect against burns.
Wash hands with soap and water after handling brazing
alloys and flux.
24VAC TRANSFORMER
Use the transformer provided with the furnace or air
handler for low-voltage control power (24VAC − 40 VA
minimum)
Evacuating the system of non−condensables is critical for
proper operation of the unit. Non−condensables are
INSTALL THERMOSTAT
SIZE CIRCUIT AND INSTALL SERVICE
DISCONNECT SWITCH
Install room thermostat (ordered separately) on an inside wall
approximatelyin the center of the conditioned area and 5 feet (1.5m) from
the floor. It should not be installed on an outside wall or where it can be
affected by sunlight or drafts.
Refer to the unit nameplate for minimum circuit ampacity, and maximum
fuse or circuit breaker (HACR per NEC). Install power wiring and properly
sized disconnect switch.
MAIN FUSE BOX/
BREAKER PANEL
THERMOSTAT
SERVICE
DISCONNECT
SWITCH
5 FEET
(1.5M)
NOTE ꢀ 24VAC, Class II circuit connections are made in the control
panel.
NOTE ꢀ Units are approved for use only with copper conductors.
Ground unit at disconnect switch or to an earth ground.
WARNING
Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and
local codes.
Line voltage is present at all components when unit is not in operation on units with single-pole contactors.
Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power
supplies.
Page 18
506645−01
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SINGLE PHASE
ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING
HIGH VOLTAGE
HIGH VOLTAGE / GROUND WIRES
CONNECTIONS
(CONTACTOR)
B
Any excess high voltage field wiring should be trimmed and
secured away from any low voltage field wiring. To facilitate a
conduit, a cutout is located in the bottom of the control panel.
Connect conduit to the control panel using a proper conduit fitting.
CONTROL
WIRING
LOW VOLTAGE CONTROL WIRING
NOTE ꢀ Wire tie provides low voltage control wire strain relief and to
maintain separation of field installed low and high voltage circuits.
GROUND
HIGH VOLTAGE
FIELD WIRING
NOTE ꢀ For proper voltages, select thermostat wire (control wires)
gauge per table above.
LOW VOLTAGE
FIELD WIRING
HIGH VOLTAGE
FLEXIBLE
CONDUIT
FACTORY
WIRING
NOTE ꢀ Do not bundle any excess 24VAC control wires inside
control panel.
INDOOR UNIT
THERMOSTAT
Install low voltage wiring from outdoor to indoor unit and from thermostat
to indoor unit as illustrated.
A
POWER
R
GROMMET AND
WIRE TIE
R
A
Run 24VAC control wires through hole with grommet and secure with
provided wire tie.
HEAT
OUTDOOR
UNIT
W
Y
B
Make 24VAC thermostat wire connections. Locate the two wires from the
contactor and make connection using field provided wire nuts:
W1
YELLOW
COOLING
S
S
Yellow to Y1
Y1
Y
G
C
Black to C (common)
INDOOR
BLOWER
WIRE RUN LENGTH
AWG# INSULATION TYPE
G
C
BLACK
LESS THAN 100’ (30 METERS) 18
MORE THAN 100’ (30 METERS) 16
TEMPERATURE RATING
35ºC MINIMUM.
COMMON
C
Figure 15. Typical Field Wiring Diagram
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HIGH PRESSURE SWITCH
(S4) ꢀ LIQUID LINE
CRANKCASE HEATER (HR1)
CRANKCASE THERMOSTAT (S40)
Figure 16. Typical Factory Wiring Diagram (Copeland Compressor)
Page 20
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THERMAL PROTECTION
SWITCH (S5 OR S173)
HIGH PRESSURE SWITCH
(S4) ꢀ LIQUID LINE
CRANKCASE HEATER (HR1)
CRANKCASE THERMOSTAT (S40)
Figure 17. Typical Factory Wiring Diagram (Interlink Compressor)
Page 21
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2. Inspect all factory− and field−installed wiring for loose
connections.
Servicing Units Delivered Void of Charge
If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.
3. After evacuation is complete, open the liquid line and
suction line service valve stems (Operating Service
(contained in outdoor unit) into the system.
1. Leak check system using procedure outlined in this
instruction.
4. Replace the stem caps and tighten to the value listed
in table 1.
2. Evacuate the system using procedure outlined in this
instruction.
5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit’s
nameplate. If not, do not start the equipment until you
have consulted with the power company and the
voltage condition has been corrected.
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
4. Evacuate the system again using procedure outlined
in this instruction.
6. Connect manifold gauge set for testing and charging
using figure 18 as a guideline.
5. Weigh in refrigerant using procedure outlined under
Start−Up and Charging Procedures.
7. Set the thermostat for a cooling demand. Turn on
power to the indoor indoor unit and close the outdoor
unit disconnect switch to start the unit.
6. Monitor the system to determine the amount of
moisture remaining in the oil. It may be necessary to
replace the filter drier several times to achieve the
required dryness level. If system dryness is not
verified, the compressor will fail in the future.
8. Recheck voltage while the unit is running. Power must
be within range shown on the unit nameplate.
9. Check system for sufficient refrigerate using the
procedures outlined in under System Refrigerant.
Unit Start−Up
System Refrigerant
IMPORTANT
If unit is equipped with a crankcase heater, it should be
energized 24 hours before unit start−up to prevent
compressor damage as a result of slugging.
This section outlines procedures for:
1. Connecting gauge set for testing and charging;
2. Checking and adjusting indoor airflow;
3. Adding or removing refrigerant.
1. Rotate fan to check for binding.
GAUGE SET
MANIFOLD GAUGE SET
CONNECTIONS FOR TESTING AND CHARGING
HIGH
LOW
SUCTION LINE
SERVICE PORT
CONNECTION
B
OUTDOOR UNIT
AClose manifold gauge set valves and connect
the center hose to a cylinder of HFC−410A.
Set for liquid phase charging.
REFRIGERANT TANK
BConnect the manifold gauge set’s low pressure
side to the suction line service port.
CHARGE IN
LIQUID PHASE
A
CConnect the manifold gauge set’s high
pressure side to the liquid line service port.
DIGITAL SCALE
DPosition temperature sensor on liquid line near
liquid line service port.
TEMPERATURE SENSOR
(LIQUID LINE)
C
TO LIQUID
LINE SERVICE
VALVE
D TEMPERATURE
SENSOR
Figure 18. Manifold Gauge Set Setup and Connections
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CHECKING AIR FLOW AT INDOOR COIL
DT
Temp.
of air
entering
indoor
coil ºF
1. Determine the desired DTꢀMeasure entering air temper-
ature using dry bulb (A) and wet bulb (B). DT is the intersect-
ing value of A and B in the table (see triangle).
80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
70 19 19 18 18 17 17 16 15 15 14 13 12 11 10
2. Find temperature drop across coilꢀMeasure the coil’s dry
bulb entering and leaving air temperatures (A and C). Tem-
A
perature Drop Formula: (T
) = A minus C.
Drop
Wet−bulb ºF
57 58 59 60 61 62 63 64 65 66 67 68 69 70
B
3. Determine if fan needs adjustmentꢀIf the difference between
the measured T and the desired DT (T –DT) is within
Drop
Drop
+3º, no adjustment is needed. See examples: Assume DT =
15 and A temp. = 72º, these C temperatures would necessi-
tate stated actions:
A
T
Drop
C
72º
19º
53º
Cº
T
–
DT
=
ºF ACTION
Drop
19
B
air flow
air flow
53º
58º
62º
–
–
–
15
15
15
=
=
=
4
Increase the airflow
DRY
BULB
DRY
BULB
64º
14
−1 (within +3º range) no change
10
−5 Decrease the airflow
WET
BULB
INDOOR
COIL
All temperatures are
expressed in ºF
4. Adjust the fan speedꢀSee indoor unit instructions to in-
crease/decrease fan speed.
Changing air flow affects all temperatures; recheck tempera-
tures to confirm that the temperature drop and DT are within
+3º.
Figure 19. Checking Indoor Airflow over Evaporator Coil using Delta−T Chart
START: Determine how refrigerant is metered
WHEN TO CHARGE?
Which
metering
device?
S
S
Best during warm weather
Can charge in colder weather by determining
best charge method? Determine by:
A
B
Metering device type
Outdoor ambient temperature
RFC
TXV
REQUIREMENTS:
S
S
S
S
Sufficient heat load in structure
65ºF
(18.3ºC) and
Above
40ºF
(4.4ºC) and
Above
39ºF
(3.8ºC) and
Below
64ºF
(17.7ºC) and
Below
Indoor temperature between 70-80ºF (21−26ºC)
Manifold gauge set connected to unit
Thermometers:
−
−
−
to measure outdoor ambient temperature
to measure liquid line temperature
to measure suction line temperature
APPROACH OR
SUBCOOLING
WEIGH-IN
SUPERHEAT
WEIGH-IN
Figure 20. Determining Charge Method
Page 23
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WEIGH IN (RFC AND TXV)
CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF CHARGE
If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the
unit. To calculate the total refrigerant charge:
Adjust amount. for variation
in line set length listed on
line set length table below.
nameplate
Amount specified on
Total charge
+
=
Refrigerant Charge per Line Set Length
Ounces per 5 feet (g per 1.5 m)
Liquid Line
adjust from 15 feet (4.6 m) line set*
Set Diameter
3/8" (9.5 mm)
3 ounce per 5’ (85 g per 1.5 m)
*If line length is greater than 15 ft. (4.6 m), add this amount. If
line length is less than 15 ft. (4.6 m), subtract this amount.
NOTE ꢀ Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the
temperature of the liquid line or when pressure drop is equal to or greater than 20 psig.
NOTE ꢀ The above nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for charge information.
Figure 21. Using HFC−410A Weigh In Method
65ºF (18.3ºC)
USE WEIGH-IN METHOD
Pressures.
and Above
Weigh-in or remove refrigerant
based upon line length
3. Set thermostat to call for heat (must have a cooling load
between 70-80ºF (21−26ºC).
ABOVE or
BELOW
4. Connect gauge set.
64ºF
(17.7ºC) and
Below
5. When heat demand is satisfied, set thermostat to call for
cooling.
6. Allow temperatures and pressures to stabilize.
7. Record outdoor ambient temperature:
AMBº =_________
If value is greater than shown (high
approach), add refrigerant; if less
than shown (liquid temperature too
close to ambient temperature, low
approach), remove refrigerant.
If refrigerant is added or
removed, retest to confirm
that unit is properly charged.
8. Record liquid line temperature:
LIQº = __________
9. Subtract to determine approach (APPº):
LIQº_____ − AMBº _____ = APPº_____
10. Compare results with table below.
APPº (Approach) Values(F:+/−1.0° [C: +/−0.6°])
ºF (ºC)*
65 (18)
75 (24)
85 (29)
95 (35)
105 (41)
115 (45)
−018
−024
−030
−036
−041
−042
−047
−048
−059/−060
8 (4.4)
9 (5.0)
9 (5.0)
9 (5.0)
9 (5.0)
9 (5.0)
4 (2.2)
5 (2.8)
6 (3.3)
5 (2,8)
3 (1.7)
3 (1.7)
2 (1.1)
4 (2.2)
4 (2.2)
4 (2.2)
4 (2.2)
3 (1.7)
2 (1.1)
4 (2.2)
6 (3.3)
5 (2.8)
5 (2.8)
4 (2.2)
2 (1.1)
5 (2.8)
8 (4.4)
7 (3.9)
6 (3.3)
6 (3.3)
3 (1.7)
3 (1.7)
4 (2.2)
4 (2.2)
4 (2.2)
5 (2.8)
6 (3.3)
6 (3.3)
8 (4.4)
8 (4.4)
8 (4.4)
8 (4.4)
9 (5.0)
9 (5.0)
8 (4.4)
8 (4.4)
8 (4.4)
8 (4.4)
7 (3.9)
8 (4.4)
8 (4.4)
8 (4.4)
8 (4.4)
9 (5.0)
*Temperature of air entering outdoor coil.
Figure 22. HFC−410A Approach TXV Charge
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65ºF (18.3ºC)
and above
USE WEIGH-IN METHOD
2. Compare unit pressures with table 4, Normal
OperatingPressures.
Weigh-in or remove refrigerant
based upon line length
3. Set thermostat to call for heat (must have a cooling load
between 70-80ºF (21−26ºC)
ABOVE or
BELOW
64ºF (17.7ºC)
and below
4. Connect gauge set
5. Measure outdoor ambient temperature
6. When heat demand is satisfied, set thermostat to call for
cooling
BLOCK OUTDOOR COIL: [sometimes necessary with lower
temperatures] Use cardboard or plastic sheet to restrict the
airflow through the outdoor coil to achieve pressures from
325−375psig (2240−2585 kPa). Higher pressures are needed
to check charge. Block equal sections of air intake panels and
move coverings sideways until the liquid pressure is in the
above noted ranges.
7. Allow temperatures and pressures to stabilize.
NOTE − If necessary, block outdoor coil to maintain 325
− 375 psig.
8. Record liquid line temperature:
CARDBOARD OR
PLASTIC SHEET
LIQº = ______
9. Measure liquid line pressure and use the value to
If value is MORE than shown,
remove refrigerant.
If refrigerant is added or
removed, verify charge using
the Approach Method.
SATº = ______
10. Subtract to determine subcooling (SCº):
SATº_____ − LIQº _____ = SCº _____
11. Compare results with table below.
If value is LESS
than shown, add
refrigerant.
MORE or
LESS
SCº (Subcooling) Values (F:+/−1.0° [C: +/−0.6°])
ºF (ºC)*
−018
−024
−030
−036
13 (7.2)
−041
9 (5.0)
−042
10 (5.6)
−047
−048
−059/−060
8 (4.4)
7 (3.9)
8 (4.4)
7 (3.9)
6 (3.3)
6 (3.3)
65 (18)
75 (24)
85 (29)
95 (35)
105 (41)
115 (45)
10 (5.6)
6 (3.3)
6 (3.3)
6 (3.3)
10 (5.6)
10 (5.6)
10 (5.6)
7 (3.9)
8 (4.4)
9 (5.0)
9 (5.0)
10 (5.6)
11 (6.1)
8 (4.4)
6 (3.3)
6 (3.3)
7 (3.9)
8 (4.4)
6 (3.3)
6 (3.3)
6 (3.3)
6 (3.3)
6 (3.3)
5 (2.8)
8 (4.4)
8 (4.4)
8 (4.4)
8 (4.4)
8 (4.4)
7 (3.9)
9 (5.0)
7 (3.9)
8 (4.4)
9 (5.0)
10 (5.6)
7 (3.9)
7 (3.9)
7 (3.9)
7 (3.9)
6 (3.3)
7 (3.9)
8 (4.4)
8 (4.4)
8 (4.4)
7 (3.9)
*Temperature of air entering outdoor coil.
Figure 23. HFC−410A Subcooling TXV Charge
Page 25
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START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
39ºF
(3.8ºC) and
Below
2. Compare unit pressures with table 4, Normal
OperatingPressures.
3. Use SUPERHEAT to correctly charge unit or to
verify the charge is correct.
Weigh-in or remove refrigerant
based upon line length
ABOVE or
BELOW
4. Set thermostat to call for heat (must have a cooling
load between 70-80ºF (21−26ºC)
40ºF
(4.4ºC) and
Above
5. Connect gauge set.
6. When heat demand is satisfied, set thermostat to
call for cooling.
SUPERHEAT RFC
7. Allow temperatures and pressures to stabilize.
SHº (Superheat) Values (+/−5ºF)
Wet Bulb (air entering indoor coil)
8. Measure the suction line pressure and use the use
value to determine saturation temperature (table
3):
ºF* 50 52 54 56 58 60 62 64 66 68 70 72 74 76
40 15 18 20 23 26 29 32 34 38 41 43 46 48 51
45 13 16 18 21 24 27 30 33 36 39 41 44 46 49
SATº =_________
9. Record suction line temperature:
VAPº =_________
50
11 14 16 19 22 25 28 31 34 37 39 42 44 47
10. Subtract to determine superheat (SHº):
VAPº − _____ SATº ______ = SHº______
55
9
7
-
12 14 17 20 23 27 30 33 36 38 40 42 44
10 12 15 18 21 24 27 30 33 35 38 40 43
60
65
6
-
-
-
-
-
-
-
-
-
-
10 13 16 19 21 24 27 30 33 36 38 41
11. Record the wet bulb temperature (air entering
indoor coil):
70
-
7
-
-
-
-
-
-
-
-
-
10 13 16 19 21 24 27 30 33 36 39
WB =_______
75
-
6
-
-
-
-
-
-
-
-
9
5
-
12 15 18 21 24 28 31 34 37
80
-
8
-
-
-
-
-
-
-
12 15 18 21 25 28 31 35
12. Record outdoor ambient temperature.
13. Compare results with table to the left.
85
-
8
5
-
11 15 19 22 26 30 33
90
-
-
9
6
-
13 16 20 24 27 31
10 14 18 22 25 29
95
-
-
100
105
110
115
-
-
-
8
5
-
12 16 21 24 28
NOTE − Do not attempt to charge system where a
dash appears, system could be overcharged.
Superheat is taken at suction line service port.
Suction line superheat must never be less than 5ºF
at the suction line service port.
-
-
-
-
9
6
-
13 17 22 26
11 15 20 25
If
refrigerant
is
-
-
-
-
REMOVED, retest to
confirm that unit is
properly charged.
-
-
-
-
-
8
14 18 24
* Dry−bulb temperature (ºF) of entering outdoor ambient air.
If refrigerant is
ADDED, retest to
confirm that unit is
properly charged.
If value is LESS than
shown, then REMOVE
refrigerant.
If value is MORE
than shown, then
ADD refrigerant.
MORE or
LESS
Figure 24. HFC−410A Superheat RFC Method
Table 3. HFC−410A Temperature ꢀ Pressure (Psig)
°F
°C
Psig
°F
°C
Psig
−40
−35
−30
−25
−20
−15
−10
−5
−40.0
−37.2
−34.4
−31.7
−28.9
−26.1
−23.3
−20.6
−17.8
−15.0
−12.2
−9.4
11.6
14.9
18.5
22.5
26.9
31.7
36.8
42.5
48.6
55.2
62.3
70.0
78.3
87.3
96.8
107
60
65
15.6
18.3
21.1
23.9
26.7
29.4
32.2
35.0
37.8
40.6
43.3
46.1
48.9
170
185
201
217
235
254
274
295
317
340
365
391
418
70
75
80
85
90
95
0
100
105
110
115
120
5
10
15
20
25
30
35
40
45
50
55
−6.7
−3.9
125
130
135
140
145
150
51.7
54.4
57.2
60.0
62.8
65.6
446
476
507
539
573
608
−1.1
1.7
4.4
118
7.2
130
10.0
12.8
142
155
Page 26
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Table 4. HFC−410A Normal Operating Pressures (Liquid +10 and Suction +5 psig)
Use this table to perform maintenance checks; it is not a procedure for charging the
system. Minor variations in these pressures may be due to differences in installations.
Significant deviations could mean that the system is not properly charged or that a
problem exists with some component in the system.
IMPORTANT
Model
−018
−024
−030
−036
−041
−042
−047
−048
−059/−060
**Temp.
5F (5C)
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Expansion Valve (TXV)*
65 (18)
70 (21)
75 (24)
80 (27)
85 (29)
90 (32)
95 (35)
100 (38)
105 (41)
110 (43)
115 (45)
230 / 138
244 / 139
265 / 140
286 / 140
307 / 142
330 / 143
351 / 144
380 / 144
407 / 145
436 / 146
466 / 147
225 / 135
242 / 137
260 / 138
282 / 140
304 / 141
326 / 142
351 / 142
376 / 144
403 / 145
433 / 145
463 / 147
226 / 129
241 / 131
259 / 134
281 / 138
301 / 140
324 / 141
348 / 142
372 / 143
399 / 144
428 / 145
456 / 146
238 / 132
254 / 135
273 / 138
293 / 140
316 / 142
340 / 143
366 / 144
392 / 145
420 / 147
449 / 148
480 / 149
233 / 142
239 / 142
256 / 143
278 / 144
299 / 145
321 / 145
343 / 146
366 / 147
389 / 148
421 / 149
452 / 151
236 / 138
253 / 140
273 / 141
296 / 142
318 / 143
341 / 144
366 / 146
392 / 147
417 / 148
445 / 149
475 / 151
233 / 139
252 / 140
272 / 141
294 / 142
315 / 142
338 / 144
361 / 144
387 / 144
413 / 145
442 / 148
465 / 148
238 / 136
256 / 138
277 / 139
299 / 140
320 / 139
343 / 140
369 / 141
395 / 142
422 / 144
450 / 146
481 / 148
239 / 133
258 / 135
278 / 136
300 / 137
323 / 138
346 / 139
370 / 140
396 / 142
415 / 143
449 / 145
476 / 147
Fixed Orifice (RFC)*
65 (18)
70 (21)
75 (24)
80 (27)
85 (29)
90 (32)
95 (35)
100 (38)
105 (41)
110 (43)
115 (46)
232 / 124
248 / 127
267 / 131
286 / 135
307 / 138
328 / 141
351 / 143
375 / 146
400 / 148
426 / 150
457 / 153
228 / 125
244 / 127
261 / 131
284 / 134
303 / 137
325 / 140
347 / 142
370 / 144
394 / 146
420 / 148
447 / 150
229 / 128
243 / 129
261 / 132
284 / 135
305 / 138
327 / 140
349 / 142
372 / 144
396 / 146
422 / 148
449 / 150
241 / 131
258 / 134
277 / 136
298 / 139
321 / 141
342 / 143
366 / 145
392 / 147
416 / 149
446 / 151
480 / 152
228 / 131
245 / 135
263 / 138
284 / 141
306 / 144
327 / 146
348 / 148
372 / 149
395 / 151
424 /153
453 / 155
248 / 135
266 / 138
285 / 141
305 / 143
327 / 145
349 / 147
372 / 149
396 / 150
421 / 152
447 / 153
476 / 154
232 / 125
249 / 129
268 / 133
286 / 136
312 / 140
332 / 142
357 / 144
379 / 146
406 / 149
430 / 150
460 / 152
240 / 126
260 / 129
281 / 133
301 / 135
324 / 138
346 / 140
371 / 142
395 / 144
420 / 146
447 / 148
473 / 150
244 / 125
263 / 128
281 / 131
303 / 134
324 / 136
347 / 139
370 / 141
394 / 143
418 / 145
444 / 146
471 / 147
*Values shown are typical pressures; indoor unit match up, indoor air quality equipment, and indoor load will cause the pressures to vary.
**Temperature of the air entering the outside coil.
Page 27
14ACX SERIES
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temperature falls to 151−187°F (66°C−86°C), and the
compressor is re−energized. This single−pole, single−throw
(SPST) bi−metallic switch is wired in series with the 24V Y
input signal to control compressor operation.
System Operation
UNIT COMPONENTS
Crankcase Heater (HR1) and Thermostat Switch
(S40) (−041 through −060 models only)
IMPORTANT
These models are equipped with either a 40 or 70 watt
belly−band type crankcase heater. HR1 prevents liquid
from accumulating in the compressor. HR1 is controlled by
a single−pole, single−throw thermostat (SPST) switch
(S40) located on the liquid line (see figure 1 for location).
Some scroll compressor have internal vacuum protector
that will unload scrolls when suction pressure goes
below 20 psig. A hissing sound will be heard when the
compressor is running unloaded. Protector will reset
when low pressure in system is raised above 40 psig. DO
NOT REPLACE COMPRESSOR.
When liquid line temperature drops below 50°F the
thermostat closes energizing HR1. The thermostat will
open, de−energizing HR1 once liquid line temperature
reaches 70° F.
High Pressure Switch (S4)
14ACX units are equipped with a high-pressure switch that
is located in the liquid line of the compressor as illustrated
manual reset button..
Maintenance
DEALER
Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each
cooling season, the system should be checked as follows:
Outdoor Unit
1. Outdoor unit fan motor is pre−lubricated and sealed.
No further lubrication is needed.
MANUAL RESET
BUTTON
2. Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
3. Check all wiring for loose connections.
4. Check for correct voltage at unit (unit operating).
5. Check amp draw on outdoor fan motor.
Motor Nameplate:_________ Actual:__________.
6. Inspect drain holes in coil compartment base and
clean if necessary.
NOTE - If insufficient cooling occurs, the unit should be
gauged and refrigerant charge should be checked.
Figure 25. High Pressure Switch (S4) Manual Reset
The switch is a Single Pole, Single Throw (SPST),
manual−reset switch which is normally closed and
removes power from the compressor when discharge
pressure rises above factory setting at 590 + 10 psi. The
manual−reset button can be identified by a red cap that is
press to preform the reset function.
Outdoor Coil
Clean and inspect outdoor coil (may be flushed with a
water hose). Ensure power is off before cleaning.
NOTE ꢀ It may be necessary to flush the outdoor coil
more frequently if it is exposed to substances which are
corrosive or which block airflow across the coil (e.g., pet
urine, cottonwood seeds, fertilizers, fluids that may contain
high levels of corrosive chemicals such as salts)
Thermal Protection Switch (S173) ꢀ Compressor
Mounted
Some units are equipped with a compressor mounted
normally closed temperature switch that prevents
compressor damage due to overheating caused by
internal friction. The switch is located on top of the
compressor casing (see figure 1). This switch senses the
compressor casing temperature and opens at 239−257°F
(115°C−125°C) to shut off compressor operation. The
auto−reset switch closes when the compressor casing
Sea Coast ꢀ Moist air in ocean locations can carry salt,
which is corrosive to most metal. Units that are located
near the ocean require frequent inspections and
maintenance. These inspections will determine the
necessary need to wash the unit including the outdoor coil.
Consult your installing contractor for proper
intervals/procedures for your geographic area or service
contract.
Page 28
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Indoor Unit
1. Clean or change filters.
S
Keep shrubbery trimmed away from the unit and
periodically check for debris which collects around the
unit.
2. Lennox blower motors are prelubricated and
permanently sealed. No more lubrication is needed.
Routine Maintenance
In order to ensure peak performance, your system must be
properly maintained. Clogged filters and blocked airflow
prevent your unit from operating at its most efficient level.
3. Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.
1. Air Filter ꢀ Ask your Lennox dealer to show you
where your indoor unit’s filter is located. It will be either
at the indoor unit (installed internal or external to the
cabinet) or behind a return air grille in the wall or
ceiling. Check the filter monthly and clean or replace
it as needed.
4. Belt Drive Blowers − Check belt for wear and proper
tension.
5. Check all wiring for loose connections.
6. Check for correct voltage at unit. (blower operating)
7. Check amp draw on blower motor.
2. Disposable Filter ꢀ Disposable filters should be
replaced with a filter of the same type and size.
Motor Nameplate:_________ Actual:__________.
NOTE ꢀ If you are unsure about the filter required for your
system, call your Lennox dealer for assistance.
Indoor Coil
1. Clean coil if necessary.
3. Reusable Filter ꢀ Many indoor units are equipped
with reusable foam filters. Clean foam filters with a
mild soap and water solution; rinse thoroughly; allow
filter to dry completely before returning it to the unit or
grille.
2. Check connecting lines, joints and coil for evidence of
oil leaks.
3. Check condensate line and clean if necessary.
NOTE ꢀ The filter and all access panels must be in place
any time the unit is in operation.
HOMEOWNER
Cleaning of the outdoor unit’s coil should be performed by
a trained service technician. Contact your dealer and set
up a schedule (preferably twice a year, but at least once a
year) to inspect and service your outdoor unit. The
following maintenance may be performed by the
homeowner.
4. Indoor Unit ꢀ The indoor unit’s evaporator coil is
equipped with a drain pan to collect condensate
formed as your system removes humidity from the
inside air. Have your dealer show you the location of
the drain line and how to check for obstructions. (This
would also apply to an auxiliary drain, if installed.)
Thermostat Operation
See the thermostat homeowner manual for instructions on
how to operate your thermostat.
IMPORTANT
Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure of the
unit to treated water (i.e., sprinkler systems, soakers,
waste water, etc.) will corrode the surface of steel and
aluminum parts and diminish performance and longevity
of the unit.
Preservice Check
If your system fails to operate, check the following before
calling for service:
S
S
S
S
S
S
Verify room thermostat settings are correct.
Verify that all electrical disconnect switches are ON.
Check for any blown fuses or tripped circuit breakers.
Verify unit access panels are in place.
Outdoor Coil
Verify air filter is clean.
The outdoor unit must be properly maintained to ensure its
proper operation.
If service is needed, locate and write down the unit
model number and have it handy before calling.
S
S
S
Please contact your dealer to schedule proper
inspection and maintenance for your equipment.
Accessories
For update−to−date information, see any of the following
publications:
Make sure no obstructions restrict airflow to the
outdoor unit.
S
S
S
Lennox 14ACX Engineering Handbook
Lennox Product Catalog
Grass clippings, leaves, or shrubs crowding the unit
can cause the unit to work harder and use more
energy.
Lennox Price Book
Page 29
14ACX SERIES
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Start−Up and Performance Checklist
Job Name
Job Location
Installer
Job no.
City
Date
State
City
State
Unit Model No.
Serial No.
Service Technician
Nameplate Voltage
Rated Load Ampacity
Compressor
Outdoor Fan
Maximum Fuse or Circuit Breaker
Electrical Connections Tight?
Indoor Blower RPM
-
Indoor Filter clean?
-
Supply Voltage (Unit Off)
S.P. Drop Over Indoor (Dry)
Suction Pressure
Outdoor Coil Entering Air Temp.
Refrigerant Charge Checked?
Discharge Pressure
-
-
Refrigerant Lines: Leak Checked? - Properly Insulated?
Service Valves: Fully Opened? - Caps Tight?
-
-
Outdoor Fan Checked?
Thermostat
Voltage With Compressor Operating
Calibrated? - Properly Set? - Level?
-
Page 30
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