Lennox Merit 14HPX, Merit 14HPX-018, Merit 14HPX-024, Merit 14HPX-030, Merit 14HPX-036 Installation Instructions Manual
...Page 1
INSTALLATION
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.
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. . . . . . . . . . . . . .
Litho U.S.A.
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.
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
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.
11/09 506377−01
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.
Page 1
*2P1109* *P506377-01*
Page 2
Unit Dimensions − inches (mm)
A
SIDE VIEW
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)
A
OUTDOOR
COIL FAN
COMPRESSOR
DISCHARGE AIR
B
SUCTION AND LIQUID
LINE CONNECTION
OPTIONAL UNIT
STANDOFF KIT (4)
(FIELD INSTALLED)
SIDE VIEW
Typical Unit Parts Arrangement
CONTROL
CAPACITOR
GROUND
LUG
CUTOUT FOR HIGH
VOLTAGE CONDUIT
CONTACTOR
DEFROST
CONTROL
BOARD
CHECK EXPANSION
CONTROL WIRE
LOOP
NOTE PLUMBING LAYOUT AND COMPRESSOR TYPE MAY VARY SLIGHTLY
BETWEEN MODEL SIZES.
COMPRESSOR
HARNESS
DEFROST
THERMOSTAT
VALV E
EQUALIZER LINE
BI−FLOW FILTER
LIQUID LINE SERVICE
DRIER
TRUE SUCTION
PORT
HIGH PRESSURE
SWITCH (S4)
VALV E
COMPRESS0R
DISCHARGE
LINE
MUFFLER
LOW PRESSURE
SWITCH
REVERSING VALVE
SOLENOID
VAPOR LINE
SERVICE VALVE
REVERSING
VALV E
506377−01 11/09
Page 2
Page 3
Model Number Identification
HP X14 024 −
Nominal SEER
Unit Type
HP = Heat Pump
Refrigerant
X = R−410A
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.
−−
230
2
Minor Revision Number
Voltage
230 = 208/230V−1phase−60hz
Cooling Capacity − Tons
018 = 1.5
024 = 2
030 = 2.5
036 = 3
042 = 3.5
048 = 4
060 = 5
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 3
14HPX SERIES
Page 4
OPERATING SERVICE VALVES
The liquid and vapor line service valves are used for
removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging.
SERVICE VALVES
VARIOUS TYPES
OPEN TO BOTH INDOOR AND
OUTDOOR UNITS
SERVICE PORT CAP
SERVICE PORT
TO INDOOR
CORE
UNIT
SERVICE PORT
(VALVE STEM
SHOWN OPEN)
INSERT HEX
WRENCH HERE
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.
SERVICE PORT CAP
SERVICE PORT
(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE
CLOSED TO BOTH
INDOOR AND OUTDOOR
UNITS
TO INDOOR UNIT
FRONT-SEATED
TO INDOOR
STEM CAP
SERVICE PORT
CORE
VALVE STEM
UNIT
TO OUTDOOR
UNIT
(FRONT−SEATED
STEM CAP
ANGLE−TYPE
SERVICE VALVE
CLOSED)
TO OUTDOOR UNIT
WHEN SERVICE VALVE IS CLOSED, THE SERVICE PORT IS OPEN TO THE
LINE SET AND INDOOR UNIT.
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 follows:
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.
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.
ANGLE−TYPE SERVICE VALVE
(BACK−SEATED OPENED)
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT CORE
SERVICE PORT CAP
TO OUTDOOR UNIT
1/6 TURN
12
11
10
9
8
1
2
3
4
5
7
6
BALL (SHOWN CLOSED)
BALL−TYPE SERVICE
VAL VE
STEM CAP
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°.
VALVE STEM
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.
Figure 1. Angle and Ball Service Valves
506377−01 11/09
Page 4
9
10
8
11
1/6 TURN
12
1
2
3
4
5
7
6
Page 5
Recovering Refrigerant from Existing System
RECOVERING
REFRIGERANT FROM SYSTEM
DISCONNECT POWER
Disconnect all power to the existing outdoor unit at the service
1
disconnect switch or main fuse box/breaker panel.
MAIN FUSE BOX/
BREAKER PANEL
SERVICE
DISCONNECT
SWITCH
RECOVERING REFRIGERANT
Remove existing 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.
CONNECT MANIFOLD GAUGE SET
Connect a gauge set, clean recovery cylinder and a recovery
2
machine to the service ports of the existing unit. Use the
instructions provided with the recovery machine to make the
connections.
MANIFOLD GAUGES
RECOVERY MACHINE
LOW
CLEAN RECOVERY
CYLINDER
OUTDOOR UNIT
HIGH
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:
A Start the existing system in the cooling mode and close the liquid line valve.
B 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 When the low side system pressures reach 0 psig, close the vapor line valve.
D Check gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system.
Page 5
14HPX SERIES
Page 6
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.
*
INSTALL UNIT AWAY
FROM WINDOWS
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
Clearance on one of the remaining two sides may be 12 in. (305
.
mm)
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 lifting heavy objects.
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.
DISCHARGE AIR
BUILDING
STRUCTURE
MOUNTING
SLAB
GROUND LEVEL
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.
506377−01 11/09
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 6
Page 7
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:
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
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)
Field
Model
−018
−024
−030
−036
−042
−048
−060
NOTE Some applications may required a field provided 7/8" to
1−1/8" adapter
Connections
Liquid
Line
3/8 in.
(10 mm)
3/8 in.
(10 mm)
3/8 in.
(10 mm)
Vapor
Line
3/4 in
(19 mm)
7/8 in
(22 mm)
1−1/8 in.
(29 mm)
Recommended Line Set
Liquid
Line
3/8 in.
(10
mm)
3/8 in.
(10
mm)
3/8 in.
(10
mm)
Vapor
Line
3/4 in
(19
mm)
7/8 in
(22
mm)
1−1/8
in.
(29
mm)
L15
Line Sets
L15−41
15 ft. − 50 ft.
(4.6 m − 15
m)
L15−65
15 ft. − 50 ft.
(4.6 m − 15
m)
Field
Fabricated
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.
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 7
14HPX SERIES
Page 8
LINE SET
INSTALLATION
Line Set Isolation The following illustrations are
examples of proper refrigerant line set isolation:
REFRIGERANT LINE SET TRANSITION
FROM VERTICAL TO HORIZONTAL
ANCHORED HEAVY NYLON
WIRE TIE OR AUTOMOTIVE
MUFFLER-TYPE HANGER
AUTOMOTIVE
MUFFLER-TYPE HANGER
IMPORTANT Refrigerant lines must not contact structure.
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
temperature of the liquid line or when pressure drop is equal to or greater
than 20 psig.
IMPORTANT Refrigerant lines must not contact wall
OUTSIDE WALL
VAPOR LINE
LIQUID LINE
WALL
STUD
STRAP LIQUID LINE TO
VAPOR LINE
LIQUID LINE
NON−CORROSIVE
METAL SLEEVE
VAPOR LINE − WRAPPED
IN ARMAFLEX
REFRIGERANT LINE SET INSTALLING
HORIZONTAL RUNS
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)
8 FEET (2.43 METERS)
STRAPPING
MATERIAL (AROUND
VAPOR LINE ONLY)
TAPE OR
WIRE TIE
FLOOR JOIST OR
ROOF RAFTER
8 FEET (2.43 METERS)
NON−CORROSIVE
METAL SLEEVE
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
WIRE TIE
INSIDE WALL
WOOD BLOCK
BETWEEN STUDS
SLEEVE
VAPOR LINE WRAPPED
WITH ARMAFLEX
OUTSIDE
WALL
PVC
PIPE
FIBERGLASS
INSULATION
CAULK
STRAP
NON−CORROSIVE
METAL SLEEVE
WIRE TIE
WOOD BLOCK
WIRE TIE
STRAP
LIQUID
LINE
NOTE Similar installation practices should be used if line set is
to be installed on exterior of outside wall.
FLOOR JOIST OR
ROOF RAFTER
506377−01 11/09
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 8
Page 9
BRAZING
CONNECTIONS
CUT AND DEBUR
Cut ends of the refrigerant lines square
1
(free from nicks or dents) and debur the
ends. The pipe must remain round and do
not pinch end of the line.
ATTACHED GAUGES
A Connect gauge set low pressure side to liquid line service
3
valve.
B Connect gauge set center port to bottle of nitrogen with
regulator.
SERVICE PORT MUST BE OPEN TO ALLOW EXIT
INDOOR
UNIT
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.
CAP AND CORE REMOVAL
Remove service cap and core
2
from both the vapor and liquid line
service ports.
HIGHLOW
B
ATTACH
POINT FOR NITROGEN
VAPOR LINE
GAUGES
VAPOR LINE
SERVICE
VALV E
OUTDOOR
UNIT
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
WRAP SERVICE VALVE
To protect components during
4
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.
BRAZE LINE SET
Braze the liquid line to the liquid line
6
service valve. Turn off nitrogen flow.
POINT FLAME AWAY FROM
SERVICE VALVE
LIQUID LINE
LIQUID LINE SERVICE
5
NOTE The fixed orifice or check
expansion valve metering device at the
indoor unit will allow low pressure
nitrogen to flow through the system.
VALV E
FLOW NITROGEN
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.
INSTALL SERVICE PORT CAPS ONLY
After all connections have been brazed, disconnect manifold gauge
7
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.
A
LOW
NITROGEN
HIGH
USE REGULATOR TO
FLOW NITROGEN AT 1
TO 2 PSIG.
NITROGEN
WARNING Allow braze joint to cool before removing the
wet rag from the service valve. (TEMPERATURES ABOVE
250ºF CAN DAMAGE VALVE SEALS
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
Figure 6. Brazing Connections
Page 9
SERVICE PORT CORE
SERVICE PORT CAP
14HPX SERIES
Page 10
Metering Devices and Flushing the System
FLUSHING
LINE SET AND INDOOR COIL (1 OF 2)
TYPICAL FIXED ORIFICE REMOVAL
PROCEDURE
1
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
TEFLON RING
FIXED ORIFICE
TYPICAL CHECK EXPANSION VALVE
REMOVAL AND REPLACEMENT PROCEDURE
TWO PIECE PATCH PLATE
(UNCASED COIL ONLY)
DISTRIBUTOR
TUBES
(Uncased Coil Shown)
ORIFICE
HOUSING
STUB END
TEFLON
RING
CHECK
EXPANSION
VALV E
LIQUID LINE
TEFLON
RING
SENSING
LINE
BRASS NUT
DISTRIBUTOR
ASSEMBLY
(Uncased Coil Shown)
A On fully cased coils, remove the coil access and plumbing panels.
B Remove any shipping clamps holding the liquid line and distributor
assembly.
C Using two wrenches, disconnect liquid line from liquid line orifice
housing. Take care not to twist or damage distributor tubes during
this process.
D Remove and discard fixed orifice, valve stem assembly if present
and Teflon washer as illustrated above.
E Use a field−provided fitting to temporary reconnect the liquid line to
the indoor unit’s liquid line orifice housing.
REMOVE AND DISCARD
WHITE TEFLON SEAL (IF
PRESENT)
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
2
VAPOR LINE
SERVICE VALVE
EXISTING
INDOOR
UNIT
LIQUID LINE SERVICE
RECOVERY
CYLINDER
A Inverted cylinder with clean refrigerant to the vapor service valve.
B gauge set (low side) to the liquid line valve.
C gauge set center port to inlet on the recovery machine with an empty
D Connect recovery tank to recovery machines per machine
VALV E
LIQUID
D
recovery tank to the gauge set.
instructions.
INVERTED CYLINDER
CONTAINS CLEAN TO
BE USED FOR
FLUSHING.
A
1
VAPOR
OUTDOOR
B
NEW
UNIT
C
GAUGE
MANIFOLD
LOW
OPENED
TANK
RETURN
INLET
DISCHARGE
RECOVERY MACHINE
CLOSED
HIGH
OR
A On fully cased coils, remove the coil access and plumbing panels.
B Remove any shipping clamps holding the liquid line and distributor as-
C Disconnect the equalizer line from the check expansion valve equaliz-
D Remove the vapor line sensing bulb.
E Disconnect the liquid line from the check expansion valve at the liquid
F Disconnect the check expansion valve from the liquid line orifice hous-
G Remove and discard check expansion valve and the two Teflon rings.
H Use a field−provided fitting to temporary reconnect the liquid line to the
I Reverse above order to install.
CAUTION This procedure should not be performed on systems
which contain contaminants (Example compressor burn out.
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER
LINE FITTING
SENSING BULB
sembly.
er line fitting on the vapor line.
line assembly.
ing. Take care not to twist or damage distributor tubes during this process.
indoor unit’s liquid line orifice housing.
EQUALIZER
LINE
ASSEMBLY WITH
VAPOR
LINE
LIQUID LINE
BRASS NUT
LIQUID
FLUSHING LINE SET
The line set and indoor unit coil must be flushed with at least the
3
same amount of clean refrigerant that previously charged the system. Check the charge in the flushing cylinder before proceeding.
B
A Set 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 indoor unit coil.
B Invert the cylinder of clean and open its valve to allow liquid re-
frigerant 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 After 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 system.
D Close 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.
LINE
506377−01 11/09
Page 10
Page 11
Leak Testing the System
LEAK TEST
LINE SET AND INDOOR COIL
CONNECT GAUGE
SET
A Connect an HFC−410A manifold gauge set high
1
pressure hose to the vapor valve service port.
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.
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.
HIGHLOW
MANIFOLD GAUGE SET
OUTDOOR UNIT
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
NITROGEN
TEST FOR LEAKS
After the line set has been connected to the indoor unit and air conditioner, check the line set connections and
2
indoor unit for leaks. Use the following procedure to test for leaks:
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 Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.
D 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 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.
F After leak testing disconnect gauges from service ports.
HFC−410A
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.
B
TO VAPOR
SERVICE VALVE
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
A
WARNING
Leak detector must be capable of sensing HFC
refrigerant.
Page 11
14HPX SERIES
Page 12
Evacuating the System
EVACUATING
LINE SET AND INDOOR COIL
CONNECT GAUGE
NOTE Remove cores from service valves (if not al-
SET
ready done).
1
A Connect low side of manifold gauge set
with 1/4 SAE in−line tee to vapor line
service valve
B Connect high side of manifold gauge
set to liquid line service valve
C Connect micron gauge available
connector on the 1/4 SAE in−line tee.
D 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.
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
HFC−410A
VACUUM PUMP
OUTDOOR
UNIT
A
B
A34000 1/4 SAE TEE WITH
SWIVEL COUPLER
500
C
D
MICRON
GAUGE
LOW
TO VAPOR
SERVICE VALVE
TO LIQUID LINE
SERVICE VALVE
MANIFOLD
GAUGE SET
HIGH
NITROGEN
RECOMMEND
MINIMUM 3/8" HOSE
EVACUATE THE SYSTEM
A Open both manifold valves and start the vacuum pump.
2
B Evacuate 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.
C When 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.
D 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.
E Reconnect 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.
F When 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.
G Perform the following:
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.
11
10
9
8
7
12
6
1/6 TURN
1
2
3
4
5
506377−01 11/09
Page 12
Page 13
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)
SIZE CIRCUIT AND INSTALL SERVICE
DISCONNECT SWITCH
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
SERVICE
DISCONNECT
SWITCH
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.
INSTALL THERMOSTAT
Install room thermostat (ordered separately) on an inside wall
approximately in 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)
NOTE 24VAC, Class II circuit connections are made in the control
panel.
Page 13
14HPX SERIES
Page 14
ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING
HIGH VOLTAGE / GROUND WIRES
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
Install low voltage wiring from outdoor to indoor unit and from
thermostat to indoor unit as illustrated.
A Run 24VAC control wires through hole with grommet.
B Make 24VAC thermostat wire connections to CMC1.
NOTE Do not bundle any excess 24VAC control wires inside
control panel.
NOTE For proper voltages, select thermostat wire (control
wires) gauge per Table above.
WIRE RUN LENGTH AWG# INSULATION TYPE
LESS THAN 100’ (30 METERS) 18 TEMPERATURE RATING
MORE THAN 100’ (30 METERS) 16 35ºC MINIMUM.
HIGH VOLTAGE
FIELD WIRING
LOW VOLTAGE
FIELD WIRING
FACTORY
WIRING
SINGLE PHASE
DEFROST CONTROL
Thermostat
BOARD (CMC1)
TYPICAL CONTROL WIRING
Low Voltage Wiring
Indoor Unit
R
C
W1
G
O
Y1
power
common
1st. stage aux. heat
indoor blower
reversing valve
compressor
(SOME CONNECTIONS MAY NOT APPLY. REFER
TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)
R
C
W1
W2
W3
G
NOTE Wire tie provides low voltage wire strain relief and
to maintain separation of field installed low and high voltage
circuits.
Outdoor Unit
power
common
1st. stage aux. heat
Low Voltage Wiring (with Auxiliary Heat)
Thermostat Indoor Unit Outdoor Unit
R
C
emergency heat
E
power
common
R
C
emer.
heat
relay
power
common
R
C
W1
O
Y1
R
C
HIGH VOLTAGE
CONNECTIONS
(CONTACTOR)
GROUND
CUTOUT FOR HIGH
VOLTAGE CONDUIT
506377−01 11/09
A
GROMMET AND WIRE TIE
FOR CONTROL WIRES
B
CONTROL WIRE
CONNECTIONS
Page 14
W1
1st. stage aux. heat
indoor blower
G
reversing valve
O
compressor
Y1
(SOME CONNECTIONS MAY NOT APPLY. REFER TO
SPECIFIC THERMOSTAT AND INDOOR UNIT.)
W1
1st. stage aux. heat
W2
W3
G
outdoor t’stat
W1
O
Y1
Page 15
Figure 7. Typical Field Wiring Diagram
Page 15
14HPX SERIES
Page 16
GAUGE SET
CONNECTIONS FOR TESTING AND CHARGING
TRUE SUCTION PORT
B
CONNECTION
REFRIGERANT TANK
MANIFOLD GAUGE SET
LOW
HIGH
OUTDOOR UNIT
CHARGE IN
LIQUID PHASE
DIGITAL SCALE
D
TEMPERATURE
SENSOR
A Close manifold gauge set valves and connect the center hose to a cylinder of HFC−410A. Set
for liquid phase charging.
INSIDE OUTDOOR UNIT
B Connect the manifold gauge set’s low pressure side to the true suction port.
C Connect the manifold gauge set’s high pressure side to the liquid line service port.
D Position temperature sensor on liquid line near 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 damage as a result of slugging.
1. Rotate fan to check for binding.
2. Inspect all factory and field-installed wiring for loose
connections.
506377−01 11/09
LINE SERVICE
Page 16
A
C
TO LIQUID
VALV E
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.
TEMPERATURE SENSOR
(LIQUID LINE)
LIQUID LINE
SERVICE
PORT
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
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.
AIRFLOW
INDOOR COIL
Temperature of air
entering indoor
coil ºF
A
Wet−bulb ºF
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
Dry−bulb
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
DT
DRY
BULB
C
53º
T
19º
Drop
air flow
air flow
B
B
64º
All temperatures are expressed in ºF
INDOOR COIL
WET BULB
Use the following procedure to adjust for optimal air flow across the indoor coil:
1. Determine the desired DT Measure entering air temperature using dry bulb (A) and wet bulb (B). DT
is the intersecting value of A and B in the Table (see triangle).
2. Find temperature drop across coil Measure the coil’s dry bulb entering and leaving air temperatures
(A and C). Temperature Drop Formula: (T
3. Determine if fan needs adjustment If the difference between the measured T
DT (T
–DT) is within +3º, no adjustment is needed. See example below:
Drop
) = A minus C.
Drop
and the desired
Drop
Assume DT = 15 and A temp. = 72º, these C temperatures would necessitate stated actions:
A
72º
DRY BULB
Cº T
53º 19 – 15 = 4 Increase the airflow
58º 14 – 15 = −1 (within +3º range) no change
62º 10 – 15 = −5 Decrease the airflow
– DT = ºF ACTION
Drop
4. Adjust the fan speed See indoor unit instructions to increase/decrease fan speed.
Figure 9. Checking Indoor Airflow over Evaporator Coil using Delta−T Chart
Changing air flow affects all temperatures; recheck
temperatures to confirm that the temperature drop
and DT are within +3º.
Page 17
14HPX SERIES
Page 18
Use WEIGH IN method for adding initial refrigerant charge, and then use SUBCOOLING method for
verifying refrigerant charge.
WEIGH IN
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:
CALCULATING SYSTEM CHARGE FOR
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
=
Refrigerant Charge per Line Set Length
Liquid Line
Set Diameter
3/8" (9.5 mm)
*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.
Ounces per 5 feet (g per 1.5 m)
adjust from 15 feet (4.6 m) line set*
3 ounce per 5’ (85 g per 1.5 m)
SUBCOOLING
USE COOLING
MODE
60ºF (15º)
USE HEATING
MODE
SATº
LIQº –
SCº =
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 modeWhen 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 modeWhen 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.
506377−01 11/09
Figure 11. Subcooling Method
Page 18
Page 19
Table 3. 14HPX−018
g
g
g
g
g
g
g
g
Target
INDOOR MATCHUPS
CBX27UH−018/024 13 7 0 8
CBX32MV−018/024 15 7 0 0
CBX40UHV−024 15 7 0 0
Subcooling
Heat Cool
5ºF)(+1ºF)
(+
*Add
charge
lb oz
Table 4. 14HPX−024
Target
INDOOR MATCHUPS
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
Subcooling
Heat Cool
5ºF)(+1ºF)
(+
*Add
charge
lb oz
Table 5. 14HPX−030
Target
INDOOR MATCHUPS
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
Subcooling
Heat Cool
5ºF)(+1ºF)
(+
*Add
charge
lb oz
Table 6. 14HPX−036
Target
INDOOR MATCHUPS
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
Subcooling
Heat Cool
5ºF)(+1ºF)
(+
*Add
charge
lb oz
Target
INDOOR MATCHUPS
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
Subcooling
Heat Cool
5ºF)(+1ºF)
(+
*Add
charge
lb oz
Table 7. 14HPX−042
Target
INDOOR MATCHUPS
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
Subcooling
Heat Cool
5ºF)(+1ºF)
(+
*Add
charge
lb oz
Table 8. 14HPX−048
Target
INDOOR MATCHUPS
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
Subcooling
Heat Cool
5ºF)(+1ºF)
(+
*Add
charge
lb oz
Table 9. 14HPX−060
Target
INDOOR MATCHUPS
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
Subcooling
Heat Cool
5ºF)(+1ºF)
(+
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).
*Add
charge
lb oz
Page 19
14HPX SERIES
Page 20
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 installations. Significant differences could mean that the system is not properly charged or that a problem exists with some
component in the system.
14HPX−018 14HPX−024 14HPX−030 14HPX−036 14HPX−042 14HPX−048 14HPX−060
5F (5C)**
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
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
*IMPORTANTThese 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).
Liquid / Vapor Liquid / Vapor Liquid / Vapor Liquid/ Vapor Liquid / Vapor Liquid / Vapor Liquid / Vapor
Cooling
Heating
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
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
50 10.0 142
55 12.8 155
125 51.7 446
145 62.8 573
150 65.6 608
506377−01 11/09
Page 20
Page 21
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.
ORDER OF REMOVAL AND REINSTALLATION
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
STEP 1
TO REMOVE PANEL,
REMOVE MOUNTING
SCREWS SECURING
PANEL TO THE UNIT.
PANEL A
PANEL B
PANEL A
PANEL C
WARNING
PANEL D
INSTALLATION
TOP CAP
STEP 1
STARTING WITH PANEL D,
INSERT PANEL UNDER UNIT
TOP CAP LIP AND LIFT
SLIGHTLY TO CLEAR SIDE LIP
OF PANEL FROM BASE.
SIDE
GROOVE
STEP 2
SLIGHTLY LIFT PANEL A IN
ORDER TO CLEAR SIDE
LIPS OF PANEL FROM
BASE OF UNIT.
STEP 3
TILT PANEL OUT SLIGHTLY
AND PULL DOWNWARD
TO REMOVE.
REPEAT STEPS 1, 2 AND
3 TO REMOVE PANELS B,
C AND FINALLY D.
PANEL A
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
SECURE PANEL, WITH
MOUNTING SCREWS.
REPEAT STEPS 1 AND 2 TO INSTALL PANELS C,
B AND FINALLY A.
BASE
Page 21
PANEL D
14HPX SERIES
Page 22
System Operation
The outdoor unit and indoor blower cycle on demand from
the room thermostat. If the thermostat blower switch is in
the ON position, the indoor blower operates continuously.
FILTER DRIER
The unit is equipped with a large−capacity biflow filter drier
which keeps the system clean and dry. If replacement is
necessary, order another of the same design and capacity.
The replacement filter drier must be suitable for use with
HFC−410A refrigerant.
TEST PINS
DEFROST
TERMINATION
PIN SETTINGS
SENSOR
PLUG IN
(COIL & AM-
BIENT
SENSORS)
DELAY
PINS
REVERSING
VALV E
LOW
AMBIENT
THERMOSTAT
PINS
DIAGNOSTIC
LEDS
24V TERMINAL
STRIP
CONNECTIONS
LOW PRESSURE SWITCH (OPTIONAL)
The 14HPX may be equipped with an optional auto−reset
low pressure switch which is located on the vapor line. The
switch shuts off the compressor when the vapor pressure
falls below the factory setting. This switch, which is ignored
during defrost operation, closes at pressures at or above
55 psig and opens at 25 psig. It is not adjustable.
HIGH PRESSURE SWITCH
The 14HPX is equipped with an auto-reset high pressure
switch (single−pole, single−throw) which is located on the
liquid line. The switch shuts off the compressor when
discharge pressure rises above the factory setting. The
switch is normally closed and is permanently adjusted to
trip (open) at 590 + 10 psig (4412 + 69 kPa).
NOTE − A Schrader core is under the pressure switches.
Defrost System
DEFROST SYSTEM DESCRIPTION
The demand defrost controller measures differential
temperatures to detect when the system is performing
poorly because of ice build−up on the outdoor coil. The
controller self−calibrates" when the defrost system starts
and after each system defrost cycle. The defrost control
board components are shown in figure 12.
The control monitors ambient temperature, outdoor coil
temperature, and total run time to determine when a
defrost cycle is required. The coil temperature probe is
designed with a spring clip to allow mounting to the outside
coil tubing. The location of the coil sensor is important for
proper defrost operation.
NOTE − The demand defrost board accurately measures
the performance of the system as frost accumulates on the
outdoor coil. This typically will translate into longer running
time between defrost cycles as more frost accumulates on
the outdoor coil before the board initiates defrost cycles.
DIAGNOSTIC LEDS
The state (Off, On, Flashing) of two LEDs on the defrost
board (DS1 [Red] and DS2 [Green]) indicate diagnostics
conditions that are described in table 13.
PRESSURE
SWITCH CIR-
CUIT CONNEC-
TIONS
Note − Component Locations
Vary by Board
Manufacturer.
Figure 12. Defrost Control Board
DEFROST BOARD PRESSURE SWITCH
CONNECTIONS
The unit’s automatic reset pressure switches (LO PS − S87
and HI PS − S4) are factory−wired into the defrost board on
the LO−PS and HI−PS terminals, respectively.
(OPTIONAL) Low Pressure Switch (LO−PS)When the
low pressure switch trips, the defrost board will cycle off the
compressor, and the strike counter in the board will count
one strike. The low pressure switch is ignored under the
following conditions:
during the defrost cycle and 90 seconds after the
termination of defrost
when the average ambient sensor temperature is
below 15° F (−9°C)
for 90 seconds following the start up of the compressor
during "test" mode
High Pressure Switch (HI−PS)When the high pressure
switch trips, the defrost board will cycle off the compressor,
and the strike counter in the board will count one strike.
DEFROST BOARD PRESSURE SWITCH SETTINGS
High Pressure (auto reset) − trip at 590 psig; reset at 418.
Low Pressure (auto reset) − trip at 25 psig; reset at 40.
5−STRIKE LOCKOUT FEATURE
The internal control logic of the board counts the pressure
switch trips only while the Y1 (Input) line is active. If a
pressure switch opens and closes four times during a Y1
(Input), the control logic will reset the pressure switch trip
counter to zero at the end of the Y1 (Input). If the pressure
switch opens for a fifth time during the current Y1 (Input),
the control will enter a lockout condition.
The 5−strike pressure switch lockout condition can be reset
by cycling OFF the 24−volt power to the control board or by
shorting the TEST pins between 1 and 2 seconds. All timer
functions (run times) will also be reset.
If a pressure switch opens while the Y1 Out line is
engaged, a 5−minute short cycle will occur after the switch
closes.
506377−01 11/09
Page 22
Page 23
AMBIENT
SENSOR
Figure 13. Sensor Locations
DEFROST SYSTEM SENSORS
Sensors connect to the defrost board through a
field-replaceable harness assembly that plugs into the
board. Through the sensors, the board detects outdoor
ambient, coil, and discharge temperature fault conditions.
As the detected temperature changes, the resistance
across the sensor changes. Figure 14 shows how the
resistance varies as the temperature changes for both
type of sensors. Sensor resistance values can be checked
by ohming across pins shown in table 12.
NOTE − When checking the ohms across a sensor, be
aware that a sensor showing a resistance value that is not
within the range shown in table 12, may be performing as
designed. However, if a shorted or open circuit is detected,
then the sensor may be faulty and the sensor harness will
needs to be replaced.
Table 12. Sensor Temp. / Resistance Range
Temperature
Sensor
Outdoor
(Ambient)
Coil −35 (−37) to 120
Discharge (if
applicable)
Note: Sensor resistance decreases as sensed temperature increases
(see figure 14).
Range °F (°C)
−35 (−37) to 120
(48)
(48)
24 (−4) to 350
(176)
Resistance values
range (ohms)
280,000 to 3750 3 & 4
280,000 to 3750 5 & 6
41,000 to 103 1 & 2
Pins/Wire
Color
(Black)
(Brown)
(Yellow)
Coil SensorThe coil temperature sensor (shown in
figure 13) considers outdoor temperatures below −35°F
(−37°C) or above 120°F (48°C) as a fault. If the coil
temperature sensor is detected as being open, shorted or
Page 23
14HPX SERIES
Page 24
out of the temperature range of the sensor, the board will
not perform demand or time/temperature defrost
operation and will display the appropriate fault code.
Heating and cooling operation will be allowed in this fault
condition.
Ambient and Coil Sensor
100
TEMPERATURE (ºF)
Ambient SensorThe ambient sensor (shown in figure
13) considers outdoor temperatures below −35°F (−37°C)
or above 120°F (48°C) as a fault. If the ambient sensor is
detected as being open, shorted or out of the temperature
range of the sensor, the board will not perform demand
defrost operation. The board will revert to
time/temperature defrost operation and will display the
appropriate fault code. Heating and cooling operation will
be allowed in this fault condition.
NOTE − Within a single room thermostat demand, if
5−strikes occur, the board will lockout the unit. Defrost
board 24 volt power R" must be cycled OFF" or the
TEST" pins on board must be shorted between 1 to 2
seconds to reset the board.
Defrost Temperature Termination Shunt (Jumper)
PinsThe defrost board selections are: 50, 70, 90, and
100°F (10, 21, 32 and 38°C). The shunt termination pin is
factory set at 50°F (10°C). If the temperature shunt is not
installed, the default termination temperature is 90°F
(32°C).
DELAY MODE
The defrost board has a field−selectable function to reduce
occasional sounds that may occur while the unit is cycling
in and out of the defrost mode. When a jumper is installed
on the DELAY pins, the compressor will be cycled off for 30
seconds going in and out of the defrost mode. Units are
shipped with jumper installed on DELAY pins.
NOTE − The 30 second off cycle is NOT functional when
jumpering the TEST pins.
OPERATIONAL DESCRIPTION
The defrost control board has three basic operational
modes: normal, calibration, and defrost.
Normal ModeThe demand defrost board monitors the
O line, to determine the system operating mode
(heat/cool), outdoor ambient temperature, coil
temperature (outdoor coil) and compressor run time to
determine when a defrost cycle is required.
5750
90
80
70
60
50
40
30
20
10
7450
9275
11775
15425
19975
26200
34375
46275
62700
0
10000 30000 50000 70000 90000
RESISTANCE (OHMS)
85300
Figure 14. Temperature/Resistance Chart
Calibration ModeThe board is considered uncalibrated
when power is applied to the board, after cool mode
operation, or if the coil temperature exceeds the
termination temperature when it is in heat mode.
Calibration of the board occurs after a defrost cycle to
ensure that there is no ice on the coil. During calibration,
the temperature of both the coil and the ambient sensor
are measured to establish the temperature differential
which is required to allow a defrost cycle.
Defrost ModeThe following paragraphs provide a
detailed description of the defrost system operation.
DETAILED DEFROST SYSTEM OPERATION
Defrost CyclesThe demand defrost control board
initiates a defrost cycle based on either frost detection or
time.
Frost DetectionIf the compressor runs longer than
30 minutes and the actual difference between the clear
coil and frosted coil temperatures exceeds the
maximum difference allowed by the control, a defrost
cycle will be initiated.
IMPORTANT − The demand defrost control board will
allow a greater accumulation of frost and will initiate
fewer defrost cycles than a time/temperature defrost
system.
TimeIf 6 hours of heating mode compressor run
time has elapsed since the last defrost cycle while the
coil temperature remains below 35°F (2°C), the
demand defrost control will initiate a defrost cycle.
ActuationWhen the reversing valve is de−energized,
the Y1 circuit is energized, and the coil temperature is
below 35°F (2°C), the board logs the compressor run time.
If the board is not calibrated, a defrost cycle will be initiated
after 30 minutes of heating mode compressor run time.
The control will attempt to self−calibrate after this (and all
other) defrost cycle(s).
Calibration success depends on stable system
temperatures during the 20−minute calibration period. If
the board fails to calibrate, another defrost cycle will be
initiated after 45 minutes of heating mode compressor run
time. Once the defrost board is calibrated, it initiates a
demand defrost cycle when the difference between the
clear coil and frosted coil temperatures exceeds the
maximum difference allowed by the control OR after 6
hours of heating mode compressor run time has been
logged since the last defrost cycle.
NOTE − If ambient or coil fault is detected, the board will not
execute the TEST" mode.
Termination The defrost cycle ends when the coil
temperature exceeds the termination temperature or after
14 minutes of defrost operation. If the defrost is terminated
by the 14−minute timer, another defrost cycle will be
initiated after 30 minutes of run time.
Test Mode A TEST option is provided for
troubleshooting. See Figure 15 for this function.
506377−01 11/09
Page 24
Page 25
TEST
Placing the jumper on the field test pins allows the technician to:
Clear short cycle lockout
Clear five−strike fault lockout
Cycle the unit in and out of defrost mode
Place the unit in defrost mode to clear the coil
When Y1 is energized and 24V power is being applied to the Control, a test cycle can be initiated by placing a jumper on the Control’s TEST pins for 2 to
5 seconds. If the jumper remains on the TEST pins for longer than five seconds, the Control will ignore the jumpered TEST pins and revert to normal
operation.
The Control will initiate one test event each time a jumper is placed on the TEST pins. For each TEST the jumper must be removed for at least one
second and then reapplied.
Y1 Active
Place a jumper on TEST pins for
longer than one second but less
than two seconds.
Clears any short cycle lockout and
five strike fault lockout function, if
applicable. No other functions will be
executed and unit will continue in the
mode it was operating.
If in COOLING Mode
No further test mode operation will be
executed until the jumper is removed
from the TEST pins and reapplied.
Place a jumper on TEST pins for
more than two seconds.
Clears any short cycle lockout and
five strike fault lockout function, if
applicable.
ACTIVE
O Line Status
If in DEFROST Mode
The unit will terminate defrost and
enter HEAT MODE uncalibrated
with defrost timer set for 34 minute
test.
INACTIVE
If in HEATING Mode
If no ambient or coil sensor exist, unit
will go into DEFROST MODE.
If ambient or coil faults exist (open or
shorted), unit will remain in HEAT
MODE.
NOTE Placing a jumper on the TEST pins will not bring the unit
out of inactive mode. The only way manually activate the heat
pump from an inactive mode is to cycle the 24VAC power to the
Control.
If jumper on TEST pins remains in
place for more than five seconds.
The unit will return to HEAT MODE
un−calibrated with defrost timer set
for 34 minutes.
Figure 15. Test Mode
Page 25
If jumper on TEST pins is remov e d
before a m aximum o f five seconds.
The unit will remain in DEFROST
MODE until termination on time or
temperature.
14HPX SERIES
Page 26
DEFROST BOARD DIAGNOSTICS
See table 13 to determine defrost board operational conditions and to diagnose cause and solution to problems.
Table 13. Defrost Control Board Diagnostic LEDs
DS2
Green
OFF OFF Power problem No power (24V) to board terminals R
Simultaneous
SLOW Flash
DS1
Red
Condition/Code Possible Cause(s) Solution
1
Check control transformer power (24V).
& C or board failure.
Normal operation Unit operating normally or in standby
mode.
2
If power is available to board and LED(s) do not
light, replace board.
None required.
Alternating SLOW
Flash
Simultaneous
FAST Flash
Alternating
FAST Flash
ON ON Circuit Board Failure Indicates that board has internal component failure. Cycle 24 volt power to board. If code does
FAULT & LOCKOUT CODES (Each fault adds 1 strike to that code’s counter; 5 strikes per code = LOCKOUT)
OFF SLOW
OFF ON
SLOW
Flash
ON OFF
SLOW
Flash
FAST
Flash
OFF Fast
Fast
Flash
Flash
OFF High Pressure Fault
ON Discharge Line Temperature
ON Discharge Line Temperature
Flash
OFF Discharge Sensor
5−minute anti−short cycle
delay
Ambient Sensor Problem Sensor being detected open or shorted or out of temperature range. Board will revert to time/
Coil Sensor Problem Sensor being detected open or shorted or out of temperature range. Board will not perform
Low Pressure Fault
Low Pressure LOCKOUT
High Pressure LOCKOUT
Fault
Initial power up, safety trip, end of
room thermostat demand.
temperature defrost operation. (System will still heat or cool).
demand or time/temperature defrost operation. (System will still heat or cool).
not clear, replace board.
1
Restricted air flow over indoor or outdoor coil.
2
Improper refrigerant charge in system.
3
Improper metering device installed or
incorrect operation of metering device.
4
Incorrect or improper sensor location
or connection to system.
This code detects shorted sensor or high discharge temperatures. If the discharge line temperature exceeds a temperature of 300ºF (148ºC) during compressor operation, the board will
de−energize the compressor contactor output (and the defrost output if active). The compressor
will remain off until the discharge temperature has dropped below 225ºF (107ºC).
None required (Jumper TEST pins to override)
1
Remove any blockages or restrictions from coils
and/or fans. Check indoor and outdoor fan motor for
proper current draws.
2
Check system charge using approach & subcooling
temperatures.
3
Check system operating pressures and compare to
unit charging charts.
4
Make sure all pressure switches and sensors have
secure connections to system to prevent refrigerant
leaks or errors in pressure and temperature measurements.
LOCKOUT
Discharge Sensor Fault The board detects open sensor or out of temperature sensor range. This fault is detected by
allowing the unit to run for 90 seconds before checking sensor resistance. If the sensor resistance is not within range after 90 seconds, the board will count one fault. After 5 faults, the board
will lockout.
LOCKOUT
Maintenance
DEALER
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at disconnect
switch(es). Unit may have multiple power
supplies.
506377−01 11/09
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.
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:
Page 26
Page 27
Outdoor Unit
1. Clean and inspect outdoor coil (may be flushed with a
water hose). Ensure power is off before cleaning.
2. Outdoor unit fan motor is pre−lubricated and sealed.
No further lubrication is needed.
3. Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
4. Check all wiring for loose connections.
5. Check for correct voltage at unit (unit operating).
6. Check amp draw on outdoor fan motor.
Motor Nameplate:_________ Actual:__________.
7. Inspect drain holes in coil compartment base and
clean if necessary.
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.
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.
NOTE - If insufficient heating or cooling occurs, the unit
should be gauged and refrigerant charge should be
checked.
Outdoor Coil
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)
Outdoor Coil The outdoor coil may be flushed with
a water hose.
Outdoor Coil (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.
Indoor Unit
1. Clean or change filters.
2. Lennox blower motors are prelubricated and
permanently sealed. No more lubrication is needed.
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.
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.
Motor Nameplate:_________ Actual:__________.
Indoor Coil
1. Clean coil if necessary.
2. Check connecting lines, joints and coil for evidence of
oil leaks.
3. Check condensate line and clean if necessary.
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.
Outdoor Coil
The outdoor unit must be properly maintained to ensure its
proper operation.
Please contact your dealer to schedule proper
inspection and maintenance for your equipment.
Make sure no obstructions restrict airflow to the
outdoor unit.
Grass clippings, leaves, or shrubs crowding the unit
can cause the unit to work harder and use more
energy.
Keep shrubbery trimmed away from the unit and
periodically check for debris which collects around the
unit.
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.
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.
2. Disposable Filter Disposable filters should be
replaced with a filter of the same type and size.
NOTE If you are unsure about the filter required for your
system, call your Lennox dealer for assistance.
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.
Page 27
14HPX SERIES
Page 28
NOTE The filter and all access panels must be in place
any time the unit is in operation.
4. Electronic Air Cleaner Some systems are
equipped with an electronic air cleaner, designed to
remove airborne particles from the air passing through
the cleaner. If your system is so equipped, ask your
dealer for maintenance instructions.
5. 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 ComfortSense® 7000 thermostat homeowner
manual for instructions on how to operate your thermostat.
Heat Pump Operation
Your new Lennox heat pump has several characteristics
that you should be aware of:
Heat pumps satisfy heating demand by delivering
large amounts of warm air into the living space. This
is quite different from gas- or oil-fired furnaces or an
electric furnace which deliver lower volumes of
considerably hotter air to heat the space.
Do not be alarmed if you notice frost on the outdoor coil
in the winter months. Frost develops on the outdoor
coil during the heating cycle when temperatures are
below 45°F (7°C). An electronic control activates a
defrost cycle lasting 5 to 15 minutes at preset intervals
to clear the outdoor coil of the frost.
During the defrost cycle, you may notice steam rising
from the outdoor unit. This is a normal occurrence. The
thermostat may engage auxiliary heat during the
defrost cycle to satisfy a heating demand; however,
the unit will return to normal operation at the
conclusion of the defrost cycle.
Extended Power Outage
The heat pump is equipped with a compressor crankcase
heater which protects the compressor from refrigerant
slugging during cold weather operation.
If power to your unit has been interrupted for several hours
or more, set the room thermostat selector to the
EMERGENCY HEAT setting to obtain temporary heat
without the risk of serious damage to the heat pump.
In EMERGENCY HEAT mode, all heating demand is
satisfied by auxiliary heat; heat pump operation is locked
out. After a six-hour compressor crankcase warm-up
period, the thermostat can be switched to the HEAT setting
and normal heat pump operation may resume.
Preservice Check
If your system fails to operate, check the following before
calling for service:
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.
Verify air filter is clean.
If service is needed, locate and write down the unit
model number and have it handy before calling.
Accessories
For update−to−date information, see any of the following
publications:
Lennox 14HPX Engineering Handbook
Lennox Product Catalog
Lennox Price Book
14HPX Check List
Job Name Job no. Date
Job Location City State
Installer 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 Filter clean? Supply Voltage (Unit Off)
Indoor Blower RPM S.P. Drop Over Indoor (Dry) Outdoor Coil Entering Air Temp.
Discharge Pressure Vapor Pressure Refrigerant Charge Checked?
Refrigerant Lines: Leak Checked? Properly Insulated? Outdoor Fan Checked?
Service Valves: Fully Opened? Caps Tight? Thermostat
Voltage With Compressor Operating Calibrated? Properly Set? Level?
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