Lennox 14HPX User manual

11/09 506377−01
*2P1109* *P506377-01*
Page 1
2009 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
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.
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.
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.
INSTALLATION
INSTRUCTIONS
Merit®Series 14HPX Units
HEAT PUMP UNITS
506377−01
11/09
Supersedes 505,243M
TABLE OF CONTENTS
Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . . . .
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Unit Parts Arrangement 2. . . . . . . . . . . . . . . . . . .
Model Number Identification 3. . . . . . . . . . . . . . . . . . . . . .
General Information 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Gauge Set and Service Valves 3. . . . . . . . . . .
Recovering Refrigerant from Existing System 5. . . . . . .
New Outdoor Unit Placement 6. . . . . . . . . . . . . . . . . . . . .
New or Replacement Line Set 6. . . . . . . . . . . . . . . . . . . . .
Metering Devices and Flushing the System 10. . . . . . . .
Testing for Leaks 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evacuating the System 12. . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Connections 13. . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Unit Delivered Void of Charge 16. . . . . . . . . . .
Start−Up 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Refrigerant 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing and Installing Louvers 21. . . . . . . . . . . . . . . . .
System Operation 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defrost System 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start−Up and Performance Checklist 28. . . . . . . . . . . . . .
Shipping and Packing List
Check the unit components for shipping damage. If you
find any damage, immediately contact the last carrier.
1 − Assembled 14HPX outdoor unit
General
The Merit®14HPX model is designed for use with
HFC−410A refrigerant only. This unit must be installed with
an approved indoor air handler or coil. See the Lennox
14HPX Engineering Handbook for approved indoor
component matchups.
IMPORTANT
This model is designed for use in expansion valve
systems only. An indoor expansion valve approved for
use with HFC−410A refrigerant must be ordered
separately, and installed prior to operating the system.
Litho U.S.A.

Page 2
506377−01 11/09
Unit Dimensions − inches (mm)
SIDE VIEW
SUCTION AND LIQUID
LINE CONNECTION
DISCHARGE AIR
SIDE VIEW
OUTDOOR
COIL FAN
COMPRESSOR
A
B
A
OPTIONAL UNIT
STANDOFF KIT (4)
(FIELD INSTALLED)
Model No. A B C
14HPX−018 24−1/4 (616) 29−1/4 (743) 28−1/2 (724)
14HPX−024 24−1/4 (616) 29−1/4 (743) 28−1/2 (724)
14HPX−030 24−1/4 (616) 33−1/4 (845) 32−1/2 (826)
14HPX−036 32−1/4 (819) 29−1/4 (743) 28−1/2 (724)
14HPX−042 32−1/4 (819) 37−1/4 (946) 36−1/2 (927)
14HPX−048 32-1/4 (819) 37−1/4 (946) 36−1/2 (927)
14HPX−060 32-1/4 (819) 43−1/4 (1099) 42−1/4 (1073)
Typical Unit Parts Arrangement
COMPRESSOR
HARNESS
LIQUID LINE SERVICE
VALVE
VAPOR LINE
SERVICE VALVE
BI−FLOW FILTER
DRIER
DISCHARGE
LINE
HIGH PRESSURE
SWITCH (S4)
COMPRESS0R
TRUE SUCTION
PORT
CHECK EXPANSION
VALVE
DEFROST
THERMOSTAT
EQUALIZER LINE
MUFFLER
REVERSING
VALVE
REVERSING VALVE
SOLENOID
LOW PRESSURE
SWITCH
NOTE  PLUMBING LAYOUT AND COMPRESSOR TYPE MAY VARY SLIGHTLY
BETWEEN MODEL SIZES.
GROUND
LUG
CONTACTOR
CONTROL
CONTROL WIRE
LOOP
CUTOUT FOR HIGH
VOLTAGE CONDUIT
DEFROST
CONTROL
BOARD
CAPACITOR

Page 3
14HPX SERIES
Model Number Identification
HP X14 024 −
Unit Type
HP = Heat Pump
Refrigerant
X = R−410A
Cooling Capacity − Tons
018 = 1.5
024 = 2
030 = 2.5
036 = 3
042 = 3.5
048 = 4
060 = 5
Minor Revision Number
Nominal SEER
2
Voltage
230 = 208/230V−1phase−60hz
230
−−
WARNING
This product and/or the indoor unit it is matched with may
contain fiberglass wool.
Disturbing the insulation during installation,
maintenance, or repair will expose you to fiberglass wool
dust. Breathing this may cause lung cancer. (Fiberglass
wool is known to the State of California to cause cancer.)
Fiberglass wool may also cause respiratory, skin, and
eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact your
supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900
General Information
These instructions are intended as a general guide and do
not supersede national or local codes in any way. Consult
authorities having jurisdiction before installation.
Operating Gauge Set and Service Valves
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
CAUTION
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.
TORQUE REQUIREMENTS
When servicing or repairing heating, ventilating, and air
conditioning components, ensure the fasteners are
appropriately tightened. Table 1 lists torque values for
fasteners.
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.
See the Lennox Service and Application Notes #C−08−1
for further details and information.
IMPORTANT
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
the fasteners are appropriately tightened. Table 1 provides
torque values for fasteners.
Table 1. Torque Requirements
Parts Recommended Torque
Service valve cap 8 ft.− lb. 11 NM
Sheet metal screws 16 in.− lb. 2 NM
Machine screws #10 28 in.− lb. 3 NM
Compressor bolts 90 in.− lb. 10 NM
Gauge port seal cap 8 ft.− lb. 11 NM
USING MANIFOLD GAUGE SET
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.

Page 4
506377−01 11/09
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
factory−installed valve stem. Figure 1 provides information
on how to access and operating both angle and ball service
valves.
(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE
VALVE STEM
FRONT-SEATED
TO OUTDOOR
UNIT
SERVICE PORT
CORE
TO INDOOR
UNIT
SERVICE PORT
SERVICE PORT CAP
CLOSED TO BOTH
INDOOR AND OUTDOOR
UNITS
STEM CAP
ANGLE−TYPE
SERVICE VALVE
(FRONT−SEATED
CLOSED)
SERVICE PORT
SERVICE PORT
CORE
TO OUTDOOR UNIT
STEM CAP
(VALVE STEM
SHOWN OPEN)
INSERT HEX
WRENCH HERE
SERVICE PORT CAP
TO INDOOR
UNIT
OPEN TO BOTH INDOOR AND
OUTDOOR UNITS
ANGLE−TYPE SERVICE VALVE
(BACK−SEATED OPENED)
BALL (SHOWN CLOSED)
SERVICE PORT CORE
TO INDOOR UNIT
TO OUTDOOR UNIT
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT CAP
STEM CAP
VALVE STEM
WHEN SERVICE VALVE IS CLOSED, THE SERVICE PORT IS OPEN TO THE
LINE SET AND INDOOR UNIT.
BALL−TYPE SERVICE
VALVE
SERVICE VALVES
VARIOUS TYPES
WHEN SERVICE VALVE IS OPEN, THE SERVICE PORT IS OPEN TO LINE SET,
INDOOR AND OUTDOOR UNIT.
To Access Service Port:
A service port cap protects the service port core from contamination and
serves as the primary leak seal.
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 fol-
lows:
123
4
5
6
7
8
9
10
11 12
1/6 TURN
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.
Operating Ball Type Service Valve:
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°.
Reinstall Stem Cap:
Stem cap protects the valve stem from damage and serves as the primary seal. Replace the stem cap and
tighten as follows:
With Torque Wrench: Finger tighten and then torque cap per Table 1.
Without Torque Wrench: Finger tighten and use an appropriately sized wrench to turn
an additional 1/12 turn clockwise.
NOTE  A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.
123
4
5
6
7
8
9
10
11 12
1/6 TURN
With Torque Wrench: Finger tighten and torque cap per Table 1.
Without Torque Wrench: Finger tighten and use an appropriately
sized wrench to turn an additional 1/6 turn clockwise.
Figure 1. Angle and Ball Service Valves

Page 5
14HPX SERIES
Recovering Refrigerant from Existing System
SERVICE
DISCONNECT
SWITCH
MAIN FUSE BOX/
BREAKER PANEL
Disconnect all power to the existing outdoor unit at the service
disconnect switch or main fuse box/breaker panel.
DISCONNECT POWER CONNECT MANIFOLD GAUGE SET
MANIFOLD GAUGES
RECOVERY MACHINE
CLEAN RECOVERY
CYLINDER
OUTDOOR UNIT
HIGH
LOW
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.
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 to
flush the system.
Remove all 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 refrigerant to flush the system.
The following devices could prevent full system charge recovery into the outdoor unit:
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:
AStart the existing system in the cooling mode and close the liquid line valve.
BUse 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.
CWhen the low side system pressures reach 0 psig, close the vapor line valve.
DCheck gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system.
RECOVERING
REFRIGERANT FROM SYSTEM
Remove existing refrigerant using one of the following procedures:
RECOVERING REFRIGERANT
IMPORTANT  Some system configurations may contain higher than normal refrigerant charge due to either large internal coil volumes,
and/or long line sets.
12
3

Page 6
506377−01 11/09
New Outdoor Unit Placement
See Unit Dimensions on Page 2 for sizing mounting slab,
platforms or supports. Refer to Figure 2 for mandatory
installation clearance requirements.
*
**
*
NOTES:
Service panel access clearance of 30 in. (762 mm) must be
maintained.
Clearance to one of the other three sides must be 36 in. (914
mm).
Clearance on one of the remaining two sides may be 12 in. (305
mm) and the final side may be 6 in. (152 mm).
Clearance required on top of unit is 48 in. (1219 mm).
A clearance of 24 in. (610 mm) must be maintained between two
units.
Figure 2. Installation Clearances
CAUTION
In order to avoid injury, take proper precaution when lift-
ing heavy objects.
POSITIONING CONSIDERATIONS
Consider the following when positioning the unit:
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.
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 3.
INSTALL UNIT AWAY
FROM WINDOWS
TWO 90ELBOWS INSTALLED IN LINE SET
WILL REDUCE LINE SET VIBRATION
Figure 3. Outside Unit Placement
PLACING OUTDOOR UNIT ON SLAB
When installing a unit at grade level, the top of the slab
should be high enough above the grade so that water from
higher ground would not collect around the unit as
illustrated in Figure 4.
GROUND LEVEL
MOUNTING
SLAB
BUILDING
STRUCTURE
DISCHARGE AIR
Figure 4. Typical Slab Mounting at Ground Level
Slab may be level or have a slope tolerance away from the
building of not more than two degrees, or 2 inches per 5
feet (51 mm per 1524 mm) as illustrated in Figure 4.
INSTALLING OUTDOOR UNIT ON ROOF
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.
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 3.

Page 7
14HPX SERIES
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
Connections on Page 9.
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.
Also, consider the following when placing and installing a
high−efficiency air conditioner:
REFRIGERANT LINE SET
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.
Table 2. Refrigerant Line Set (MM)
Model
Field
Connections Recommended Line Set
Liquid
Line
Vapor
Line
Liquid
Line
Vapor
Line
L15
Line Sets
−018
−024
−030
3/8 in.
(10 mm)
3/4 in
(19 mm)
3/8 in.
(10
mm)
3/4 in
(19
mm)
L15−41
15 ft. − 50 ft.
(4.6 m − 15
m)
−036
−042
−048
3/8 in.
(10 mm)
7/8 in
(22 mm)
3/8 in.
(10
mm)
7/8 in
(22
mm)
L15−65
15 ft. − 50 ft.
(4.6 m − 15
m)
−060 3/8 in.
(10 mm)
1−1/8 in.
(29 mm)
3/8 in.
(10
mm)
1−1/8
in.
(29
mm)
Field
Fabricated
NOTE  Some applications may required a field provided 7/8" to
1−1/8" adapter
NOTE  When installing refrigerant lines longer than 50
feet, contact Lennox Technical Support Product
Applications for assistance or Lennox piping manual. To
obtain the correct information from Lennox, be sure to
communicate the following points:
Model (14HPX) and size of unit (e.g. −060).
Line set diameters for the unit being installed as listed
in Table 2 and total length of installation.
Number of elbows and if there is a rise or drop of the
piping.
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.
If the 14HPX 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 14HPX unit.
Typically a liquid line used to meter flow is 1/4" in diameter
and copper.
LINE SET ISOLATION
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.
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
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.
Failure to properly flush the system per the
instructions below will void the warranty.

Page 8
506377−01 11/09
ANCHORED HEAVY NYLON
WIRE TIE OR AUTOMOTIVE
MUFFLER-TYPE HANGER
STRAP LIQUID LINE TO
VAPOR LINE
WALL
STUD
LIQUID LINE
NON−CORROSIVE
METAL SLEEVE
VAPOR LINE − WRAPPED
IN ARMAFLEX
AUTOMOTIVE
MUFFLER-TYPE HANGER
REFRIGERANT LINE SET  TRANSITION
FROM VERTICAL TO HORIZONTAL
Line Set Isolation  The following illustrations are
examples of proper refrigerant line set isolation:
STRAPPING
MATERIAL (AROUND
VAPOR LINE ONLY)
TAPE OR
WIRE TIE
WIRE TIE (AROUND
VAPOR LINE ONLY)
FLOOR JOIST OR
ROOF RAFTER
TAPE OR
WIRE TIE
To hang line set from joist or rafter, use either metal strapping material
or anchored heavy nylon wire ties.
8 FEET (2.43 METERS)
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.
FLOOR JOIST OR
ROOF RAFTER
REFRIGERANT LINE SET  INSTALLING
HORIZONTAL RUNS
NOTE  Similar installation practices should be used if line set is
to be installed on exterior of outside wall.
PVC
PIPE
FIBERGLASS
INSULATION
CAULK
OUTSIDE
WALL
VAPOR LINE WRAPPED
WITH ARMAFLEX
LIQUID
LINE
OUTSIDE WALL LIQUID LINE
VAPOR LINE
WOOD BLOCK
BETWEEN STUDS
STRAP
WOOD BLOCK
STRAP
SLEEVE
WIRE TIE
WIRE TIE
WIRE TIE
INSIDE WALL
REFRIGERANT LINE SET  INSTALLING
VERTICAL RUNS (NEW CONSTRUCTION SHOWN)
INSTALLATION
LINE SET
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.
NON−CORROSIVE
METAL SLEEVE
IMPORTANT  Refrigerant lines must not contact structure.
NON−CORROSIVE
METAL SLEEVE
8 FEET (2.43 METERS)
IMPORTANT  Refrigerant lines must not contact wall
WARNING  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.
Figure 5. Line Set Installation

Page 9
14HPX SERIES
CUT AND DEBUR
CAP AND CORE REMOVAL
Cut ends of the refrigerant lines square
(free from nicks or dents) and debur the
ends. The pipe must remain round and do
not pinch end of the line.
Remove service cap and core
from both the vapor and liquid line
service ports.
ATTACHED GAUGES
OUTDOOR
UNIT
LIQUID LINE
VAPOR LINE
LIQUID LINE SERVICE
VALVE
VAPOR LINE
SERVICE
VALVE
ATTACH
GAUGES
INDOOR
UNIT
SERVICE PORT MUST BE OPEN TO ALLOW EXIT
POINT FOR NITROGEN
AConnect gauge set low pressure side to liquid line service
valve.
BConnect gauge set center port to bottle of nitrogen with
regulator.
NITROGEN
HIGHLOW
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
WRAP SERVICE VALVE FLOW NITROGEN
To protect components during
brazing, wrap a wet cloth around
the liquid line service valve body
and copper tube stub and use
another wet cloth underneath the
valve body to protect the base
paint.
Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration
gauge set into the valve stem port connection on the liquid line service
valve and out of the valve stem port connection on the vapor service
valve.
NOTE  The fixed orifice or check
expansion valve metering device at the
indoor unit will allow low pressure
nitrogen to flow through the system.
NITROGEN
HIGH
LOW
USE REGULATOR TO
FLOW NITROGEN AT 1
TO 2 PSIG.
BRAZE LINE SET
INSTALL SERVICE PORT CAPS ONLY
Braze the liquid line to the liquid line
service valve. Turn off nitrogen flow.
After all connections have been brazed, disconnect manifold gauge
set from service ports, cool down piping with wet rag and remove all
wrappings. Do not reinstall cores until after evacuation procedure.
Reinstall service port caps if desired to close off refrigerant ports.
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.
SERVICE PORT CORE
SERVICE PORT CAP
SERVICE PORT
WARNING  Allow braze joint to cool before removing the
wet rag from the service valve. (TEMPERATURES ABOVE
250ºF CAN DAMAGE VALVE SEALS
CONNECTIONS
BRAZING
12
3
45
6
7
B
A
POINT FLAME AWAY FROM
SERVICE VALVE
NOTE − Use silver alloy brazing rods with five or six percent minimum silver
alloy for copper−to−copper brazing, 45 percent alloy for copper−to−brass and
copper−to−steel brazing.
Figure 6. Brazing Connections

Page 10
506377−01 11/09
Metering Devices and Flushing the System
SENSING
LINE
TEFLON RING
FIXED ORIFICE
(Uncased Coil Shown)
BRASS NUT
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR TUBES
DISTRIBUTOR
ASSEMBLY
REMOVE AND DISCARD
WHITE TEFLON SEAL (IF
PRESENT)
AOn fully cased coils, remove the coil access and plumbing panels.
BRemove any shipping clamps holding the liquid line and distributor
assembly.
CUsing two wrenches, disconnect liquid line from liquid line orifice
housing. Take care not to twist or damage distributor tubes during
this process.
DRemove and discard fixed orifice, valve stem assembly if present
and Teflon washer as illustrated above.
EUse a field−provided fitting to temporary reconnect the liquid line to
the indoor unit’s liquid line orifice housing.
TYPICAL FIXED ORIFICE REMOVAL
PROCEDURE
TYPICAL CHECK EXPANSION VALVE
REMOVAL AND REPLACEMENT PROCEDURE
TWO PIECE PATCH PLATE
(UNCASED COIL ONLY)
VAPOR
LINE
DISTRIBUTOR
ASSEMBLY
DISTRIBUTOR
TUBES
LIQUID
LINE
MALE EQUALIZER
LINE FITTING
EQUALIZER
LINE
CHECK
EXPANSION
VALVE
TEFLON
RING
(Uncased Coil Shown)
STUB END
TEFLON
RING
SENSING BULB
LIQUID LINE
ORIFICE
HOUSING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
AOn fully cased coils, remove the coil access and plumbing panels.
BRemove any shipping clamps holding the liquid line and distributor as-
sembly.
CDisconnect the equalizer line from the check expansion valve equaliz-
er line fitting on the vapor line.
DRemove the vapor line sensing bulb.
EDisconnect the liquid line from the check expansion valve at the liquid
line assembly.
FDisconnect the check expansion valve from the liquid line orifice hous-
ing. Take care not to twist or damage distributor tubes during this pro-
cess.
GRemove and discard check expansion valve and the two Teflon rings.
HUse a field−provided fitting to temporary reconnect the liquid line to the
indoor unit’s liquid line orifice housing.
IReverse above order to install.
LOW HIGH
EXISTING
INDOOR
UNIT
GAUGE
MANIFOLD
INVERTED CYLINDER
CONTAINS CLEAN TO
BE USED FOR
FLUSHING.
LIQUID LINE SERVICE
VALVE
INLET
DISCHARGE
TANK
RETURN
CLOSED
OPENED
RECOVERY
CYLINDER
RECOVERY MACHINE
NEW
OUTDOOR
UNIT
VAPOR LINE
SERVICE VALVE
VAPOR
LIQUID
1
AInverted cylinder with clean refrigerant to the vapor service valve.
Bgauge set (low side) to the liquid line valve.
Cgauge set center port to inlet on the recovery machine with an empty
recovery tank to the gauge set.
DConnect recovery tank to recovery machines per machine
instructions.
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
A
B
C
D
B
OR
FLUSHING LINE SET
ASet the recovery machine for liquid recovery and start the recov-
ery machine. Open the gauge set valves to allow the recovery
machine to pull a vacuum on the existing system line set and in-
door unit coil.
BInvert the cylinder of clean and open its valve to allow liquid re-
frigerant to flow into the system through the vapor line valve. Al-
low the refrigerant to pass from the cylinder and through the line
set and the indoor unit coil before it enters the recovery machine.
CAfter all of the liquid refrigerant has been recovered, switch the
recovery machine to vapor recovery so that all of the vapor is
recovered. Allow the recovery machine to pull down to 0 the sys-
tem.
DClose the valve on the inverted drum and the gauge set valves.
Pump the remaining refrigerant out of the recovery machine and
turn the machine off.
The line set and indoor unit coil must be flushed with at least the
same amount of clean refrigerant that previously charged the sys-
tem. Check the charge in the flushing cylinder before proceeding.
LINE SET AND INDOOR COIL (1 OF 2)
FLUSHING
1
2
3
CAUTION  This procedure should not be performed on systems
which contain contaminants (Example compressor burn out.

Page 11
14HPX SERIES
Leak Testing the System
TO VAPOR
SERVICE VALVE
HFC−410A
MANIFOLD GAUGE SET
OUTDOOR UNIT
HIGHLOW
NITROGEN
NOTE  Normally, the high pressure hose is connected to the liquid line port. How-
ever, connecting it to the vapor port better protects the manifold gauge set from high
pressure damage.
AWith 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).
BOpen 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.
CConnect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.
DAdjust 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.
EAfter 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.
FAfter leak testing disconnect gauges from service ports.
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
LINE SET AND INDOOR COIL
After the line set has been connected to the indoor unit and air conditioner, check the line set connections and
indoor unit for leaks. Use the following procedure to test for leaks:
LEAK TEST
AConnect an HFC−410A manifold gauge set high
pressure hose to the vapor valve service port.
BWith both manifold valves closed, connect the
cylinder of HFC−410A refrigerant to the center port
of the manifold gauge set.
1CONNECT GAUGE
SET
2TEST FOR LEAKS
A
B
NOTE  Later in the procedure, the HFC−410A
container will be replaced by the nitrogen container.
WARNING
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 follow this warning may result in personal injury
or death.
WARNING
Fire, Explosion and Personal Safety
Hazard.
Failure to follow this warning could
result in damage, personal injury or
death.
Never use oxygen to pressurize or
purge refrigeration lines. Oxygen,
when exposed to a spark or open
flame, can cause damage by fire
and/or an explosion, that could result
in personal injury or death.
IMPORTANT
Leak detector must be capable of sensing HFC
refrigerant.

Page 12
506377−01 11/09
Evacuating the System
AOpen both manifold valves and start the vacuum pump.
BEvacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).
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.
CWhen the absolute pressure reaches 23,000 microns (29.01 inches of mercury), close the manifold gauge valves, turn off the vacuum
pump and disconnect the manifold gauge center port hose from vacuum pump. Attach the manifold center port hose to a dry nitrogen
cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose. Open the manifold gauge valves to break the vacuum in
the line set and indoor unit. Close the manifold gauge valves.
DShut 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.
EReconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the
absolute pressure 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.
FWhen the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to an
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.
GPerform the following:
OUTDOOR
UNIT
TO VAPOR
SERVICE VALVE
TO LIQUID LINE
SERVICE VALVE
MICRON
GAUGE
VACUUM PUMP
A34000 1/4 SAE TEE WITH
SWIVEL COUPLER
500
MANIFOLD
GAUGE SET
HFC−410A
RECOMMEND
MINIMUM 3/8" HOSE
AConnect low side of manifold gauge set
with 1/4 SAE in−line tee to vapor line
service valve
BConnect high side of manifold gauge
set to liquid line service valve
CConnect micron gauge available
connector on the 1/4 SAE in−line tee.
DConnect 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.
HIGH
LOW
123
4
5
6
7
8
9
1011 12
1/6 TURN
NITROGEN
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
EVACUATING
1CONNECT GAUGE
SET
A
B
C
D
2EVACUATE THE SYSTEM
Close manifold gauge valves.
Shut off HFC−410A cylinder.
Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with
core tool while maintaining a positive system pressure.
Replace the stem caps and secure finger tight, then tighten an additional one−sixth (1/6) of a turn as
illustrated.
LINE SET AND INDOOR COIL
NOTE  Remove cores from service valves (if not al-
ready done).

Page 13
14HPX SERIES
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.
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.
Evacuating the system of non−condensables is critical for
proper operation of the unit. Non−condensables are
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.
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).
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.
24VAC TRANSFORMER
Use the transformer provided with the furnace or air
handler for low-voltage control power (24VAC − 40 VA
minimum)
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.
NOTE  Units are approved for use only with copper conductors.
Ground unit at disconnect switch or to an earth ground.
SIZE CIRCUIT AND INSTALL SERVICE
DISCONNECT SWITCH
NOTE  24VAC, Class II circuit connections are made in the control
panel.
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.
THERMOSTAT
5 FEET
(1.5M)
INSTALL THERMOSTAT
SERVICE
DISCONNECT
SWITCH
MAIN FUSE BOX/
BREAKER PANEL
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 14
506377−01 11/09
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.
ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING
WIRE RUN LENGTH AWG# INSULATION TYPE
LESS THAN 100’ (30 METERS) 18 TEMPERATURE RATING
MORE THAN 100’ (30 METERS) 16 35ºC MINIMUM.
Install low voltage wiring from outdoor to indoor unit and from
thermostat to indoor unit as illustrated.
HIGH VOLTAGE / GROUND WIRES
CONTROL WIRING
ARun 24VAC control wires through hole with grommet.
BMake 24VAC thermostat wire connections to CMC1.
NOTE  For proper voltages, select thermostat wire (control
wires) gauge per Table above.
NOTE  Wire tie provides low voltage wire strain relief and
to maintain separation of field installed low and high voltage
circuits.
NOTE  Do not bundle any excess 24VAC control wires inside
control panel.
TYPICAL CONTROL WIRING
R
C
W1
Y1
O
G
R
C
W1
W2
W3
G
reversing valve
Thermostat Indoor Unit
R
C
W1
Y1
O
Outdoor Unit
power
common
1st. stage aux. heat
indoor blower
compressor
(SOME CONNECTIONS MAY NOT APPLY. REFER
TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)
power
common
1st. stage aux. heat
Low Voltage Wiring
R
C
W1
Y1
O
G
R
C
W1
W2
W3
G
Thermostat Indoor Unit Outdoor Unit
E
R
C
W1
Y1
O
1st. stage aux. heat
emer.
heat
relay
outdoor t’stat
(SOME CONNECTIONS MAY NOT APPLY. REFER TO
SPECIFIC THERMOSTAT AND INDOOR UNIT.)
reversing valve
power
common
1st. stage aux. heat
indoor blower
compressor
power
common
emergency heat
Low Voltage Wiring (with Auxiliary Heat)
SINGLE PHASE
CONTROL WIRE
CONNECTIONS
DEFROST CONTROL
BOARD (CMC1)
CUTOUT FOR HIGH
VOLTAGE CONDUIT
GROUND
HIGH VOLTAGE
CONNECTIONS
(CONTACTOR)
HIGH VOLTAGE
FIELD WIRING
LOW VOLTAGE
FIELD WIRING
FACTORY
WIRING
GROMMET AND WIRE TIE
FOR CONTROL WIRES
A
B

Page 15
14HPX SERIES
Figure 7. Typical Field Wiring Diagram

Page 16
506377−01 11/09
TO LIQUID
LINE SERVICE
VALVE
TEMPERATURE
SENSOR
DIGITAL SCALE
REFRIGERANT TANK
TEMPERATURE SENSOR
(LIQUID LINE)
MANIFOLD GAUGE SET
AClose manifold gauge set valves and connect the center hose to a cylinder of HFC−410A. Set
for liquid phase charging.
BConnect the manifold gauge set’s low pressure side to the true suction port.
CConnect the manifold gauge set’s high pressure side to the liquid line service port.
DPosition temperature sensor on liquid line near liquid line service port.
OUTDOOR UNIT
CHARGE IN
LIQUID PHASE
CONNECTIONS FOR TESTING AND CHARGING
GAUGE SET
A
C
D
LOW HIGH
BTRUE SUCTION PORT
CONNECTION
INSIDE OUTDOOR UNIT
LIQUID LINE
SERVICE
PORT
Figure 8. Gauge Set Connections
Servicing Units Delivered Void of Charge
If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.
1. Leak check system using procedure outlined on Page
11.
2. Evacuate the system using procedure outlined on
Page 12.
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
4. Evacuate the system again using procedure outlined
on Page 12.
5. Weigh in refrigerant using procedure outlined in Figure
10.
Start−Up
IMPORTANT
Crankcase heater (if applicable) should be energized 24
hours before unit start−up to prevent compressor dam-
age as a result of slugging.
1. Rotate fan to check for binding.
2. Inspect all factory and field-installed wiring for loose
connections.
3. After evacuation is complete, open the liquid line and
suction line service valves to release the refrigerant
charge (contained in outdoor unit) into the system.
4. Replace the stem caps and tighten as specified in
Operating Service Valves on Page 3.
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.
6. 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.
7. Recheck voltage while the unit is running. Power must
be within range shown on the nameplate.
8. Check system for sufficient refrigerate by using the
procedures listed under Start−Up and Charging
Procedures.
9. Recheck voltage while the unit is running. Power must
be within range shown on the nameplate.
System Refrigerant
This section outlines procedures for:
1. Connecting gauge set for testing and charging;
2. Checking and adjusting indoor airflow;
3. Adding or removing refrigerant.

Page 17
14HPX SERIES
ADDING OR REMOVING REFRIGERANT
This system uses HFC−410A refrigerant which operates at much higher pressures than . The pre−installed liquid line filter
drier is approved for use with HFC−410A only. Do not replace it with components designed for use with . This unit is NOT
approved for use with coils which use capillary tubes or fixed orifices as a refrigerant metering device.
Check airflow using the Delta−T (DT) process using the illustration in Figure 9.
Cº T
Drop –DT=ºF ACTION
53º 19 – 15 =4Increase the airflow
58º 14 – 15 =−1 (within +3º range) no change
62º 10 – 15 =−5 Decrease the airflow
DT
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
57 58 59 60 61 62 63 64 65 66 67 68 69 70
Temperature of air
entering indoor
coil ºF
INDOOR COIL
DRY BULB
DRY
BULB
WET BULB
B
TDrop
19º
A
Dry−bulb
Wet−bulb ºF
A
72º
B
64º
C
53º
air flow
air flow
All temperatures are expressed in ºF
1. Determine the desired DT Measure entering air temperature using dry bulb (A) and wet bulb (B). DT
is the intersecting value of Aand B in the Table (see triangle).
2. Find temperature drop across coil  Measure the coil’s dry bulb entering and leaving air temperatures
(Aand C). Temperature Drop Formula: (TDrop) = Aminus C.
3. Determine if fan needs adjustment  If the difference between the measured TDrop and the desired
DT(TDrop–DT) is within +3º, no adjustment is needed. See example below:
4. Adjust the fan speed  See indoor unit instructions to increase/decrease fan speed.
Assume DT= 15 and Atemp. = 72º, these C temperatures would necessitate stated actions:
AIRFLOW
Use the following procedure to adjust for optimal air flow across the indoor coil:
INDOOR COIL
Changing air flow affects all temperatures; recheck
temperatures to confirm that the temperature drop
and DT are within +3º.
Figure 9. Checking Indoor Airflow over Evaporator Coil using Delta−T Chart

Page 18
506377−01 11/09
Use WEIGH IN method for adding initial refrigerant charge, and then use SUBCOOLING method for
verifying refrigerant charge.
WEIGH IN
Liquid Line
Set Diameter
Ounces per 5 feet (g per 1.5 m)
adjust from 15 feet (4.6 m) line set*
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.
Refrigerant Charge per Line Set Length
NOTE  The above nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for
charge information.
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.
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:
Amount specified on nameplate Adjust amount. for variation in line set
length listed on line set length table below.
Additional charge specified per indoor
unit match−ups starting on Page 19. Total charge
++=
Figure 10. Weigh In Method
1 Check the airflow as illustrated in figure 9 to be sure the indoor airflow is as required. (Make any air flow
adjustments before continuing with the following procedure.)
2 Measure outdoor ambient temperature; determine whether to use cooling mode or heating mode to
check charge.
3 Connect gauge set.
4 Check Liquid and Vapor line pressures. Compare pressures with Normal Operating Pressures table 10,
(The reference table is a general guide. Expect minor pressure variations. Significant differences may
mean improper charge or other system problem.)
5 Set thermostat for heat/cool demand, depending on mode being used:
Using cooling modeWhen the outdoor ambient temperature is 60°F (15°C) and above. Target
subcooling values in table below are based on 70 to 80°F (21−27°C) indoor return air temperature; if
necessary, operate heating to reach that temperature range; then set thermostat to cooling mode setpoint
to 68ºF (20ºC). When pressures have stabilized, continue with step 6.
Using heating modeWhen the outdoor ambient temperature is below 60°F (15°C). Target subcooling
values in table below are based on 65−75°F (18−24°C) indoor return air temperature; if necessary, operate
cooling to reach that temperature range; then set thermostat to heating mode setpoint to 77ºF (25ºC). When
pressures have stabilized, continue with step 6.
6 Read the liquid line temperature; record in the LIQº space.
7 Read the liquid line pressure; then find its corresponding temperature in the temperature/ pressure chart
listed in table 11 and record it in the SATº space.
8 Subtract LIQº temp. from SATº temp. to determine subcooling; record it in SCº space.
9 Compare SCº results with table below, being sure to note any additional charge for line set and/or match−up.
10 If subcooling value is greater than shown in tables 3 through 8 for the applicable unit, remove refrigerant;
if less than shown, add refrigerant.
11 If refrigerant is added or removed, repeat steps 5 through 10 to verify charge.
USE COOLING
MODE
USE HEATING
MODE
60ºF (15º)
SATº
LIQº –
SCº =
SUBCOOLING
Figure 11. Subcooling Method

Page 19
14HPX SERIES
Table 3. 14HPX−018
INDOOR MATCHUPS
Target
Subcooling
Heat Cool
*Add
charge
g
Heat Cool
(+5ºF)(+1ºF) lb oz
CBX27UH−018/024 13 7 0 8
CBX32MV−018/024 15 7 0 0
CBX40UHV−024 15 7 0 0
Table 4. 14HPX−024
INDOOR MATCHUPS
Target
Subcooling
Heat Cool
*Add
charge
g
Heat Cool
(+5ºF)(+1ºF) lb oz
CH23−41 16 8 0 2
CBX26UH−024 25 7 0 0
CBX27UH−018/024 15 8 1 2
CBX32M−018/024 16 8 0 14
CBX32M−030 15 8 1 3
CBX32MV−018/024 16 8 0 4
CBX32MV−024/030 15 8 1 2
CH33−25A 16 6 0 7
CH33−42B 14 11 1 10
CH33−36A 16 8 1 0
CH33−36C 16 8 0 4
CR33−30/36A/B/C 25 7 0 2
CX34−25A/B 16 8 0 14
CX34−31A/B 15 8 1 3
CX34−36A/B/C 16 8 1 8
CX34−38A/B S/N# 6007 and after 11 11 2 2
CX34−38A/B before S/N# 6007 14 11 2 2
Table 5. 14HPX−030
INDOOR MATCHUPS
Target
Subcooling
Heat Cool
*Add
charge
g
Heat Cool
(+5ºF)(+1ºF) lb oz
C33−44C 11 6 2 3
CH23−41 11 6 0 8
CH23−51 6 6 1 12
CBX26UH−024 30 8 0 6
CBX26UH−030 29 8 2 3
CBX27UH−030 11 6 2 4
CBX32M−030 11 6 1 6
CBX32M−036 11 6 2 4
CBX32MV−024/030 11 6 1 6
CBX32MV−036 25 7 0 0
CBX40UHV−024, −030 11 6 1 6
CBX40UHV−036 25 6 0 0
CH33−36C 11 3 0 0
CH33−42B 6 6 1 12
CR33−30/36A/B/C 30 8 0 8
CX34−31A/B 11 6 1 6
CX34−38A/B S/N# 6007 and after 6 6 2 3
CX34−38A/B before S/N# 6007 11 6 2 3
CX34−43B/C 15 11 2 14
Table 6. 14HPX−036
INDOOR MATCHUPS
Target
Subcooling
Heat Cool
*Add
charge
g
Heat Cool
(+5ºF)(+1ºF) lb oz
C33−44C 13 6 0 0
CBX26UH−036 26 5 0 0
CBX26UH−037 25 4 1 9
CBX27UH−036 13 6 0 3
CBX32M−036 13 6 0 2
CBX32M−042 13 6 0 3
CBX32MV−036 13 6 0 3
CBX32MV−048 11 8 2 5
CH33−50/60C 11 8 2 5
CH33−44B 13 6 1 7
CH33−48B 13 6 1 8
INDOOR MATCHUPS
Target
Subcooling
Heat Cool
*Add
charge
g
Heat Cool
(+5ºF)(+1ºF) lb oz
14HPX−036 (Continued)
CR33−50/60C 25 4 1 15
CR33−48B/C 25 5 0 9
CX34−49C 13 6 2 4
CX34−43B/C, −50/60C 13 6 1 8
CX34−38A/B S/N# 6007 and after 6 6 0 0
CX34−38A/B before S/N# 6007 13 6 0 0
Table 7. 14HPX−042
INDOOR MATCHUPS
Target
Subcooling
Heat Cool
*Add
charge
g
Heat Cool
(+5ºF)(+1ºF) lb oz
CH23−68 20 9 0 13
CBX26UH−042 27 6 0 0
CBX27UH−042 12 6 0 8
CBX32M−048 12 6 0 7
CBX32MV−048 12 6 0 8
CBX40UHV−042, −048 12 6 0 8
CH33−43 12 6 0 7
CH33−62D 12 6 0 10
CH33−50/60C 12 6 0 7
CH33−60D 12 6 0 4
CR33−50/60C,−60D 26 6 0 4
CX34−62C, −62D 12 6 0 9
CX34−49C 12 6 0 7
CX34−60D 12 6 0 4
Table 8. 14HPX−048
INDOOR MATCHUPS
Target
Subcooling
Heat Cool
*Add
charge
g
Heat Cool
(+5ºF)(+1ºF) lb oz
CH23−68 20 9 2 9
CBX26UH−048 8 7 1 9
CBX27UH−048 11 8 1 2
CBX32M−048, −060 11 8 1 2
CBX32MV−048 25 8 0 0
CBX32MV−060 11 8 1 2
CBX32MV−068 10 7 1 12
CBX40UHV−048 25 6 0 0
CBX40UHV−060 12 6 0 8
CH33−50/60C 11 8 1 1
CH33−62D 10 7 1 14
CH33−60D 11 8 0 0
CR33−50/60C 35 5 0 0
CR33−60D 37 6 0 0
CX34−62C, −62D 10 7 1 7
CX34−49D 11 8 0 14
CX34−60D 11 8 0 0
Table 9. 14HPX−060
INDOOR MATCHUPS
Target
Subcooling
Heat Cool
*Add
charge
g
Heat Cool
(+5ºF)(+1ºF) lb oz
CH23−68 12 5 0 0
CBX26UH−048 12 7 1 0
CBX26UH−060 14 4 0 0
CBX27UH−060 12 5 0 0
CBX32M−048, −060 12 5 0 0
CBX32MV−048, −060 12 5 0 0
CBX32MV−068 12 7 1 0
CH33−50/60C 12 5 0 0
CH33−62D 12 5 0 0
CX34−62C, −62D 12 7 1 0
NOTE − *Add charge = Extra match up amount required in addition to
charge indicated on Heat Pump nameplate (remember to also add any
charge required for line set differences from 15 feet).

Page 20
506377−01 11/09
Table 10. Normal Operating Pressures − Liquid +10 and Vapor +5 PSIG*
IMPORTANT
Use table 10 as a general guide when performing maintenance checks. This is not a procedure for charging the unit (Refer
to Charging / Checking Charge section). Minor variations in these pressures may be expected due to differences in instal-
lations. Significant differences could mean that the system is not properly charged or that a problem exists with some
component in the system.
5F
(
5C
)
**
14HPX−018 14HPX−024 14HPX−030 14HPX−036 14HPX−042 14HPX−048 14HPX−060
Liquid / Vapor Liquid / Vapor Liquid / Vapor Liquid/ Vapor Liquid / Vapor Liquid / Vapor Liquid / Vapor
Cooling
65 (18) 226 / 140 233 / 137 238 / 138 220 / 138 223 / 125 231 / 136 243 / 136
70 (21) 244 / 141 252 / 138 263 / 139 236 / 140 241 / 130 248 / 139 263 / 137
75 (24) 263 / 142 271 / 140 279 / 139 256 / 141 261 / 134 271 / 140 282 / 138
80 (27) 283 / 143 292 / 141 299 / 140 276 / 142 282 / 138 291 / 142 306 / 139
85 (29) 302 / 144 314 / 142 324 / 141 298 / 143 302 / 139 312 / 143 327 / 140
90 (32) 328 / 145 338 / 143 340 / 142 321 / 144 326 / 140 335 / 144 351 / 141
95 (35) 351 / 146 361 / 145 375 / 145 344 / 144 349 / 141 359 / 145 376 / 142
100 (38) 376 / 147 387 / 146 397 / 145 369 / 146 374 / 142 384 / 146 401 / 143
105 (41) 402 / 148 412 / 147 424 / 147 394 / 147 399 / 143 411 / 148 426 / 145
110 (38) 430 / 149 441 / 148 454 / 150 421 / 148 428 / 145 439 / 149 452 / 146
115 (45) 465 / 150 471 / 151 485 / 150 449 / 149 455 / 146 468 / 150 484 / 148
Heating
60 (15) 346 / 139 352 / 138 338 / 137 350 / 134 373 / 139 355 / 130 351 / 117
50 (10) 323 / 117 331 / 114 334 / 112 331 / 117 363 / 117 336 / 113 333 / 105
40 (4) 306 / 98 304 / 99 312 / 93 313 / 97 348 / 97 315 / 88 316 / 88
30 (−1) 278 / 84 299 / 80 302 / 74 298 / 83 336 / 74 296 / 72 308 / 70
20 (−7) 273 / 66 283 / 66 280 / 53 284 / 66 322 / 64 286 / 64 300 / 61
*IMPORTANTThese are most−popular−match−up pressures. Indoor match up and indoor load cause pressures to vary.
**Temperature of the air entering the outside coil (outdoor ambient temperature).
Table 11. HFC−410A Temperature  Pressure (Psig)
°F °C Psig °F °C Psig
−40 −40.0 11.6 60 15.6 170
−35 −37.2 14.9 65 18.3 185
−30 −34.4 18.5 70 21.1 201
−25 −31.7 22.5 75 23.9 217
−20 −28.9 26.9 80 26.7 235
−15 −26.1 31.7 85 29.4 254
−10 −23.3 36.8 90 32.2 274
−5 −20.6 42.5 95 35.0 295
0−17.8 48.6 100 37.8 317
5−15.0 55.2 105 40.6 340
10 −12.2 62.3 110 43.3 365
15 −9.4 70.0 115 46.1 391
20 −6.7 78.3 120 48.9 418
25 −3.9 87.3 125 51.7 446
30 −1.1 96.8 130 54.4 476
35 1.7 107 135 57.2 507
40 4.4 118 140 60.0 539
45 7.2 130 145 62.8 573
50 10.0 142 150 65.6 608
55 12.8 155