Page 1
INSTALLATION
©2014 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
WARNING
The State of California has determined that this product
may contain or produce a chemical or chemicals, in very
low doses, which may cause serious illness or death. It
may also cause cancer, birth defects, or reproductive
harm.
NOTICE !
For more in-depth information, consult the Installa
tion and Service Procedures manual, available as
Corp. 0619-L4 on DaveNet or through the Technical
Support department at 800-453-6669.
INSTRUCTIONS
Merit® Series 13HPX Units
HEAT PUMP
506727-01
3/2014
Supersedes 6/2013
GENERAL
This 13HPX outdoor heat pump 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
13HPX Product Specifications bulletin for approved indoor
component match ups.
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
HVAC professional installer (or equivalent) or a service
agency.
Litho U.S.A.
STEP 1 -- SETTING THE UNIT -- CLEARANCES
NOTES:
See
NOTES
See NOTES
See NOTES
See
NOTES
CONTROL
BOX
Service clearance of 30 in. (762 mm) must be maintained on
one of the sides adjacent to the control box.
Clearance to one of the other three sides must be 36 in. (914
mm)
Clearance to one of the remaining two sides may be 12 in.
(305 mm) and the final side may be 6 in. (152 mm).
A clearance of 24 in. must be maintained between two units.
48 in. (1219 mm) clearance required on top of unit.
FIGURE 1
Page 1
Page 2
UNIT DIMENSIONS - INCHES (MM)
A
B
SIDE
VIEW
FIGURE 2
TABLE 1
UNIT DIMENSIONS
Model No. A B
13HPX-018-230 24-1/4 (616) 33-1/4 (845)
13HPX-024-230 24-1/4 (616) 33-1/4 (845)
13HPX-030-230 28-1/4 (718) 29-1/4 (743)
13HPX-036-230 28-1/4 (718) 37-1/4 (946)
13HPX-042-230 28-1/4 (718) 43-1/4 (1099)
13HPX-048-230 28‐1/4 (718) 33-1/4 (845)
13HPX-060-230 28‐1/4 (718) 37-1/4 (946)
NOTICE !
Roof Damage!
This system contains both refrigerant and oil. Some
rubber roofing material may absorb oil, causing the
rubber to degrade. Failure to follow this notice could
result in damage to roof surface.
IMPORTANT !
This model is designed for use in check / expansion
valve systems only. An indoor expansion valve ap
proved for use with HFC-410A refrigerant must be or
dered separately and installed prior to operating the
system.
IMPORTANT !
Exhaust vents from dryers, water heaters and furnaces
should be directed away from the outdoor unit. Pro
longed exposure to exhaust gases and the chemicals
contained within them may cause condensation to
form on the steel cabinet and other metal components
of the outdoor unit. This will diminish unit performance
and longevity.
PLACEMENT
INSTALL UNIT AWAY
FROM WINDOWS
STEP 1 -- SETTING THE UNIT
(CONTINUED) -- Unit Placement
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take care
while handling this equipment.
WARNING
To prevent personal injury, as well as damage to panels,
unit or structure, observe the following:
While installing or servicing this unit, carefully stow all
removed panels so that the panels will not cause injury to
personnel, objects or nearby structures. Also, take care to
store panels where they will not be subject to damage
(e.g., being bent or scratched).
While handling or stowing the panels, consider any
weather conditions (especially wind) that may cause
panels to be blown around and damaged.
CAUTION
Before attempting to perform any service or maintenance,
turn the electrical power to unit OFF at disconnect switch.
TWO 90_ ELBOWS INSTALLED IN LINE SET
WILL REDUCE LINE SET VIBRATION
FIGURE 3
SLAB MOUNTING
Install unit level or, if on a slope, maintain slope tolerance of 2 degrees
(or 2 inches per 5 feet [50 mm per 1.5 m]) away from building structure.
BUILDING
STRUCTURE
DISCHARGE AIR
MOUNTING
SLAB
GROUND LEVEL
FIGURE 4
Page 2
Page 3
STEP 2 -- REFRIGERANT PIPING -- Flush
ing Existing Line Set and Indoor Coil
Flush the existing line set per the following
instructions. For more information, refer to the
Installation and Service Procedures manual available
on DaveNet. CAUTION - DO NOT attempt to flush and
re-use existing line sets or indoor coil when the system
contains contaminants (i.e., compressor burn out).
NOTE - When installing refrigerant lines longer than 50 feet,
refer to the Refrigerant Piping Design and Fabrication
Guidelines manual available on DaveNet (Corp. 9351-L9),
or contact the Technical Support Department Product
Application group for assistance.
TABLE 2
REFRIGERANT LINE SET — INCHES (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
IMPORTANT !
If this unit is being matched with an approved line set
or indoor unit coil that 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 insula
tor, preventing proper heat transfer. It can also clog
the expansion device and reduce system perfor
mance and capacity.
Failure to properly flush the system per this instruc
tion and the detailed Installation and Service Proce
dures manual will void the warranty.
WARNING
When using a high pressure gas such as
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 Haz
ard. Failure to follow this warning could re
sult in damage, personal injury or death.
Never use oxygen to pressurize or purge re
frigeration lines. Oxygen, when exposed to
a spark or open flame, can cause fire and/or
an explosion, that could result in property
damage, personal injury or death.
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.
IMPORTANT !
Some scroll compressors have an internal vacuum
protector that will unload scrolls when suction pres
sure goes below 20 psig. A hissing sound will be
heard when the compressor is running unloaded.
Protector will reset when low pressure in system is
raised above 40 psig. DO NOT REPLACE COMPRES
SOR.
Page 3
13HPX SERIES
Page 4
LINE SET INSTALLATION
IMPORTANT — Refrigerant lines must not contact structure.
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
WALL
STUD
NON-CORROSIVE
METAL SLEEVE
AUTOMOTIVE
MUFFLER‐TYPE HANGER
STRAP LIQUID LINE TO
VAPOR LINE
LIQUID LINE
VAPOR LINE - WRAPPED
IN ARMAFLEX
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
WOOD BLOCK
BETWEEN STUDS
VAPOR LINE
LIQUID LINE
WIRE TIE
INSIDE WALL
STRAP
NON-CORROSIVE
METAL SLEEVE
WIRE TIE
WOOD BLOCK
WIRE TIE
STRAP
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)
FLOOR JOIST OR
ROOF RAFTER
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
SLEEVE
VAPOR LINE WRAPPED
WITH ARMAFLEX
OUTSIDE
PVC
PIPE
WALL
FIBERGLASS
INSULATION
CAULK
LIQUID
LINE
NOTE — Similar installation practices should be used if line set is
to be installed on exterior of outside wall.
FIGURE 5
Page 4
Page 5
STEP 2 -- REFRIGERANT PIPING -- Removing Existing Indoor Metering Device
TYPICAL EXISTING FIXED ORIFICE
1A
DISTRIBUTOR
ASSEMBLY
A. On fully cased coils, remove the coil access and plumbing panels.
B. Remove any shipping clamps from the liquid line and distributor as
sembly.
C. Using two wrenches, disconnect liquid line from liquid line orifice hous
ing. Take care not to twist or damage distributor tubes during this pro
cess.
D. Remove and discard fixed orifice, valve stem assembly (if present)
and Teflon® washer as illustrated above.
E. Use a field-provided fitting to temporarily reconnect the liquid line to the
indoor unit's liquid line orifice housing.
(UNCASED COIL SHOWN)
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
TEFLON® RING
FIXED ORIFICE
REMOVE AND DISCARD
WHITE TEFLON
(IF PRESENT)
®
SEAL
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
REMOVAL PROCEDURE
OR
BRASS NUT
1B
TWO-PIECE PATCH PLATE
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
2
CYLINDER CONTAINING
CLEAN HCFC-22 TO BE
USED FOR FLUSHING
(Positioned to deliver liquid
A
refrigerant)
1
VAPOR LINE
SERVICE VALVE
EXISTING
INDOOR
UNIT
LIQUID LINE SERVICE
VALV E
RECOVERY
CYLINDER
VAPOR
LIQUID
OUTDOOR
B
NEW
UNIT
OPENED
C
D
RECOVERY MACHINE
A. HCFC-22 cylinder with clean refrigerant (positioned to deliver liquid
refrigerant) to the vapor service valve.
B. HCFC-22 gauge set (low side) to the liquid line valve.
C. HCFC-22 gauge set center port to inlet on the recovery machine with an
empty recovery tank connected to the gauge set.
D. Connect recovery tank to recovery machine per machine instructions.
GAUGE
MANIFOLD
LOW HIGH
CLOSED
TANK
RETURN
INLET
DISCHARGE
TYPICAL EXISTING EXPANSION VALVE REMOVAL
PROCEDURE (UNCASED COIL SHOWN)
ORIFICE
HOUSING
EQUALIZER
LINE
STUB END
TEFLON
RING
VAPOR
CHECK
EXPANSION
VALV E
®
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
LINE
TEFLON
(UNCASED COIL ONLY)
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER
LINE FITTING
A. On fully cased coils, remove the coil access and plumbing panels.
B. Remove any shipping clamps from the liquid line and distributor
assembly.
C. Disconnect the equalizer line from the check expansion valve
equalizer line fitting on the vapor line.
D. Remove the vapor line sensing bulb.
E. Disconnect the liquid line from the check expansion valve at the
liquid line assembly.
F. Disconnect the check expansion valve from the liquid line orifice
housing. Take care not to twist or damage distributor tubes during
this process.
G. Remove and discard check expansion valve and the two Teflon
rings.
H. Use a field-provided fitting to temporarily reconnect the liquid line
to the indoor unit's liquid line orifice housing.
LIQUID LINE
SENSING BULB
FLUSHING LINE SET
The line set and indoor unit coil must be flushed with at least the same
3
amount of clean refrigerant that previously charged the system. Check
the charge in the flushing cylinder before proceeding.
A. Set the recovery machine for liquid recovery and start the
recovery machine. Open the gauge set valves to allow the
recovery machine to pull a vacuum on the existing system line
B
set and indoor unit coil.
B. Position the cylinder of clean HCFC-22 for delivery of liquid
refrigerant and open its valve to allow liquid refrigerant to flow
into the system through the vapor line valve. Allow the refrigerant
to pass from the cylinder and through the line set and the indoor
unit coil before it enters the recovery machine.
C. After all of the liquid refrigerant has been recovered, switch the
recovery machine to vapor recovery so that all of the HCFC-22
vapor is recovered. Allow the recovery machine to pull the
system down to 0.
D. Close the valve on the inverted HCFC-22 drum and the gauge
set valves. Pump the remaining refrigerant out of the recovery
machine and turn the machine off.
RING
®
SENSING
LINE
LIQUID
LINE
®
FIGURE 6
Page 5
13HPX SERIES
Page 6
STEP 2 -- REFRIGERANT PIPING -- Brazing Procedures
CUT AND DEBUR
Cut ends of the refrigerant lines square (free from nicks or dents)
1
and debur the ends. The pipe must remain round. Do not crimp end
of the line.
CUT AND DEBUR
LINE SET SIZE MATCHES
SERVICE VALVE CONNECTION
SERVICE VALVE
COPPER TUBE
REDUCER
CONNECTION
STUB
LINE SET SIZE IS SMALLER
THAN CONNECTION
REFRIGERANT LINE
DO NOT CRIMP SERVICE VALVE
CONNECTOR WHEN PIPE IS
SMALLER THAN CONNECTION
CAP AND CORE REMOVAL
Remove service cap and core from
2
both the suction / vapor and liquid line
service ports.
SERVICE PORT
CAP
SERVICE
PORT
CORE
ANGLE-TYPE SERVICE
VALV E
BALL-TYPE SERVICE
VALV E
ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE
VALVES
3
Flow regulated nitrogen (at 1 to 2 psig) through the low-side refrigeration gauge set into the liquid line service port valve, and out of the suction /
vapor line service port valve.
A. Connect gauge set low pressure side to
liquid line service valve (service port).
B. Connect gauge set center port to bottle of
nitrogen with regulator.
C. Remove core from valve in suction / vapor
line service port to allow nitrogen to escape.
ATTACH
GAUGES
HIGHLOW
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
SERVICE
PORT
CORE
SERVICE
PORT CAP
SUCTION / VAPOR SERVICE PORT MUST BE
OPEN TO ALLOW EXIT POINT FOR NITROGEN
VAPOR LINE
INDOOR
UNIT
LIQUID LINE
C
LIQUID LINE SERVICE
SUCTION /
VAPOR LINE
SERVICE
VALV E
VALV E
FIGURE 7
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.
B
OUTDOOR
UNIT
WHEN BRAZING LINE SET TO
A
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
Danger of fire. Bleeding the refrigerant
charge from only the high side may result
in pressurization of the low side shell and
suction tubing. Application of a brazing
torch to a pressurized system may result in
ignition of the refrigerant and oil mixture.
Check the high and low pressures before
applying heat.
NITROGEN
WARNING
Page 6
Page 7
WRAP SERVICE VALVES
To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use
4
additional water-saturated cloths underneath the valve body to protect the base paint.
FLOW NITROGEN
Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and
5
out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections.
BRAZE LINE SET
Wrap both service valves with water-saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Cloths must
6
remain water-saturated throughout the brazing and cool-down process.
LIQUID LINE SERVICE VALVE
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
IMPORTANT — Allow braze joint to cool. Apply
additional water-saturated cloths to help cool brazed
joint. Do not remove water-saturated cloths until
piping has cooled. Temperatures above 250ºF will
damage valve seals.
LIQUID LINE
WATER-SATURATED
CLOTH
WARNING
FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE
may result if you do not wrap a water-saturated cloth around
both liquid and suction line service valve bodies and copper
tube stub while brazing the line set! The braze, when
complete, must be quenched with water to absorb any
residual heat.
Do not open service valves until refrigerant lines and
indoor coil have been leak-tested and evacuated. Refer
to Installation and Service Procedures manual found on
DAVENET.
SUCTION / VAPOR LINE
PREPARATION FOR NEXT STEP
After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water-saturated cloths to both
7
services valves to cool piping. Once piping is cool, remove all water-saturated cloths.
SUCTION / VAPOR LINE
SERVICE VALVE
WATER-SATURATED
CLOTH
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
FIGURE 8
Page 7
13HPX SERIES
Page 8
STEP 2 -- REFRIGERANT PIPING -- Installing Indoor Expansion Valve
This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at
the indoor coil. See the 13HPX Product Specifications bulletin (EHB) for approved expansion valve kit match ups. The
expansion valve unit can be installed internal or external to the indoor coil. In applications where an uncased coil is being
installed in a field-provided plenum, install the expansion valve in a manner that will provide access for field servicing of the
expansion valve. Refer to below illustration for reference during installation of expansion valve unit. After installation of the
indoor coil metering device, proceed to Step 5.
INDOOR EXPANSION VALVE INSTALLATION
TWO-PIECE
PATCH PLATE
(UNCASED
COIL ONLY)
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER LINE
FITTING (SEE
EQUALIZER LINE
INSTALLATION FOR
DETAILS)
(Uncased Coil Shown)
LIQUID LINE
ORIFICE
HOUSING
STUB
END
TEFLON
RING
EQUALIZER
LINE
VAPOR
LINE
Sensing bulb insulation is required if
check/expansion valve is installed external
to the coil casing. See sensing bulb
installation for bulb positioning.
CHECK/
EXPANSION
VALV E
TEFLON
®
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
LIQUID LINE
RING
®
SENSING
LINE
C. Install one of the provided Teflon® rings around the
stubbed end of the check/expansion valve and use re
frigerant oil to lightly lubricate the connector threads
and exposed surface of the Teflon® ring.
D. Attach the stubbed end of the check/expansion valve
to the liquid line orifice housing. Finger tighten, then use
an appropriately sized wrench to turn an additional 1/2
turn clockwise as illustrated in the figure to the right, or
tighten to 20 ft-lb.
E. Place the remaining Teflon® washer around the other
end of the check expansion valve. Lightly lubricate
connector threads and expose surface of the Teflon
ring with refrigerant oil.
F. Attach the liquid line assembly to the check expansion
valve. Finger tighten, then use an appropriately sized
wrench to turn an additional 1/2 turn clockwise as illus
trated in the figure above or tighten to 20 ft-lb.
SENSING BULB INSTALLATION
A. Attach the vapor line sensing bulb in the proper orienta
tion as illustrated below using the clamp and screws
provided.
B. NOTE - Though it is preferred to have the sensing bulb
installed on a horizontal run of the vapor line, installation
on a vertical run of piping is acceptable if necessary.
NOTE — Confirm proper thermal contact between vapor line
and check/expansion bulb before insulating the sensing bulb.
C. Connect the equalizer line from the check/expansion
valve to the equalizer vapor port on the vapor line. Fin
ger tighten the flare nut, then tighten an additional 1/8
turn (7 ft-lbs) as illustrated to the right.
1/2 Turn
12
1
11
10
9
8
®
2
3
4
5
7
6
1/8 Turn
12
1
11
10
9
8
2
3
4
5
7
6
EQUALIZER LINE INSTALLATION
A. Remove and discard either the flare seal cap or flare nut with
copper flare seal bonnet from the equalizer line port on the vapor
line as illustrated in the figure below.
B. Remove the field-provided fitting that temporarily reconnected
the liquid line to the indoor unit's distributor assembly.
FLARE SEAL CAP
OR
FLARE NUT
COPPER FLARE
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
VAPOR LINE
FIGURE 9
VAPOR LINE
Page 8
VAPOR LINE
BULB
BULB
NOTE — NEVER MOUNT THE SENSING BULB
12
12
ON BOTTOM OF LINE.
ON LINES SMALLER THAN
7/8”, MOUNT SENSING
BULB AT EITHER THE 3 OR
9 O'CLOCK POSITION.
BULB
ON 7/8” AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION. NEVER MOUNT
THE SENSING BULB ON
BOTTOM OF LINE.
BULB
Page 9
STEP 3 -- LEAK TEST AND EVACUATION
LEAK TEST
LOW
B
NITROGEN
CONNECT GAUGE SET
1
A. Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port.
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.
B. With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of
the manifold gauge set.
HFC-410A
HIGH
MANIFOLD GAUGE SET
TO VAPOR
SERVICE VALVE
(ANGLE OR BALL
TYPE)
A
OUTDOOR UNIT
NOTE — Later in the procedure, the HFC-410A container will be replaced
by the nitrogen container.
After the line set has been connected to the indoor and outdoor units, check the line set connections and
indoor unit for leaks. Use the following procedure to test for leaks:
2
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 nitrogen with a pressure regulating valve to the center port of the manifold gauge
set.
D. Adjust 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.
FIGURE 10
Page 9
13HPX SERIES
Page 10
STEP 3 -- LEAK TEST AND EVACUATION (CONTINUED)
CONNECT GAUGE SET
NOTE — Remove cores from service valves (if not already done).
3
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 available micron gauge 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.
NITROGEN
HFC-410A
OUTDOOR
UNIT
VACUUM PUMP
EVACUATION
A
B
1/4 SAE TEE WITH SWIVEL
COUPLER
500
C
MICRON
GAUGE
SERVICE VALVE
TO LIQUID LINE
SERVICE VALVE
MINIMUM 3/8” HOSE
MANIFOLD
GAUGE SET
TO VAPOR
RECOMMEND
LOW
D
EVACUATE THE SYSTEM
A. Open both manifold valves and start the vacuum pump.
4
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 above absolute zero within a given volume or system. Absolute
pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.
C. When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following:
Close manifold gauge valves.
Close valve on vacuum pump.
Turn off vacuum pump.
Disconnect manifold gauge center port hose from vacuum pump.
Attach manifold center port hose to a nitrogen cylinder with pressure
regulator set to 150 psig (1034 kPa) and purge the hose.
Open manifold gauge valves to break the vacuum in the line set and
indoor unit.
Possible equipment damage.
Avoid deep vacuum operation. Do not use
compressors to evacuate a system.
Extremely low vacuum can cause internal
arcing and compressor failure. Damage
caused by deep vacuum operation will
void warranty.
Close manifold gauge valves.
D. Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the
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 a
cylinder of HFC-410A positioned to deliver liquid 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 stem caps and finger tighten them, then tighten an additional one-sixth (1/6)
of a turn as illustrated.
WARNING !
10
9
8
1/6 TURN
12
11
7
6
HIGH
1
2
3
4
5
FIGURE 11
Page 10
Page 11
STEP 4 -- ELECTRICAL -- Circuit Sizing and Wire Routing
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)
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.
If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start-up to prevent
compressor damage as a result of slugging.
ELECTROSTATIC
DISCHARGE
(ESD)
Precautions and
Procedures
IMPORTANT !
CAUTION
Electrostatic discharge can affect
electronic components. Take care during
unit installation and service to protect the
unit's electronic controls. Precautions will
help to avoid control exposure to
electrostatic discharge by putting the unit,
the control and the technician at the same
electrostatic potential. Touch hand and all
tools on an unpainted unit surface before
performing any service procedure to
neutralize electrostatic charge.
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
connect to an earth ground.
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.
FIGURE 12
Page 11
13HPX SERIES
Page 12
STEP 4 -- ELECTRICAL (CONTINUED) -- High Voltage and Field Control Wiring
The following illustration provide an example of control wiring connections when using standard thermostat.
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.
TYPICAL 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 below.
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
Low Voltage Wiring (with Auxiliary Heat)
Thermostat
R
C
POWER
COMMON
Indoor Unit
R
C
POWER
COMMON
Low Voltage Wiring
Thermostat
R
C
W1
G
O
Y1
Indoor Unit
POWER
COMMON
1ST. STAGE AUX.
HEAT
INDOOR BLOWER
(SOME CONNECTIONS MAY NOT APPLY. REFER
TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)
R
C
W1
W2
W3
G
REVERSING VALVE
COMPRESSOR
1ST. STAGE AUX.
POWER
COMMON
HEAT
Outdoor Unit
R
C
W1
O
Y1
E
EMERGENCY
HEAT
W1
1ST. STAGE AUX.
HEAT
G
INDOOR BLOWER
O
Y1
(SOME CONNECTIONS MAY NOT APPLY. REFER TO
SPECIFIC THERMOSTAT AND INDOOR UNIT.)
REVERSING VALVE
COMPRESSOR
EMER.
HEAT
RELAY
W1
1ST. STAGE AUX.
W2
W3
G
OUTDOOR
HEAT
NOTE — Wire tie provides low voltage wire strain relief and to maintain separation of field installed low and high voltage circuits.
Outdoor Unit
T'STAT
R
C
W1
O
Y1
FIGURE 13
STEP 5 -- UNIT START-UP
IMPORTANT
If unit is equipped with a crankcase heater, it should be
energized 24 hours before unit start-up to prevent
compressor damage as a result of slugging.
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 valve stems to release the
refrigerant charge (contained in outdoor unit) into the
system.
4. Replace the stem caps and tighten to the value listed in
table 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. Connect manifold gauge set for testing and charging.
7. Set the thermostat for a cooling demand. Turn on power
to the indoor indoor unit and close the outdoor unit
disconnect switch to start the unit.
8. Recheck voltage while the unit is running. Power must
be within range shown on the unit nameplate.
9. Check system for sufficient refrigerate using the
procedures outlined in under System Refrigerant.
OPERATING MANIFOLD GAUGE SET AND 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. Figures 14 and 15 provides
information on how to access and operating both angle and
ball service valves.
Page 12
Page 13
Torque Requirements
When servicing or repairing heating, ventilating, and air
conditioning components, ensure the fasteners are
appropriately tightened. Table 3 lists torque values for
fasteners.
TABLE 3
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
IMPORTANT
OPERATING ANGLE TYPE SERVICE VALVE:
1. Remove stem cap with an appropriately sized wrench.
2. Use a service wrench with a hex-head extension (3/16” for liquid
line valve sizes and 5/16” for vapor line valve sizes) to back the
stem out counterclockwise as far as it will go.
SERVICE PORT CAP
SERVICE PORT CORE
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
STEM CAP
ANGLE-TYPE SERVICE VALVE
(BACK-SEATED OPENED)
When service valve is OPEN, the service port is
open to line set, indoor and outdoor unit.
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.
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.
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°.
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT
SERVICE PORT
CORE
CAP
BALL (SHOWN
CLOSED)
VALV E
STEM
STEM CAP
(VALVE STEM SHOWN CLOSED)
INSERT HEX WRENCH HERE
ANGLE-TYPE SERVICE VALVE
(FRONT-SEATED CLOSED)
When service valve is CLOSED, the service port is
open to the line set and indoor unit.
NOTE — A label with specific torque requirements may be affixed to the
stem cap. If the label is present, use the specified torque.
FIGURE 15
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:
11
7
1/6 TURN
12
1
5
6
1/12 TURN
2
3
4
With torque wrench: Finger tighten and
torque cap per table 3.
Without torque wrench: Finger tighten and
use an appropriately sized wrench to turn
an additional 1/6 turn clockwise.
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:
10
9
8
With Torque Wrench: Finger tighten
and then torque cap per table 3.
Without Torque Wrench: Finger
tighten and use an appropriately
sized wrench to turn an addition
al 1/12 turn clockwise.
9
10
8
11
12
1
2
3
4
5
7
6
FIGURE 14
FIGURE 16
Page 13
13HPX SERIES
Page 14
CHECKING
The 13HPX unit is factory-charged with enough HFC-410A
refrigerant to accommodate a 15-foot length of refrigerant
piping. Charge should be checked and adjusted using the
tables provided on the charging procedure sticker on the unit
access panel. Detailed information is given in the 13HPX
Installation and Service Procedures manual, which is
available on DaveNet.
Defrost System
Time Delay
The timed‐off delay is five minutes long. The delay helps to
protect the compressor from short‐cycling in case the power
to the unit is interrupted or a pressure switch opens. The
delay is bypassed by placing the timer select jumper across
the TEST pins for 0.5 seconds.
Test Mode
The TEST mode is activated by removing the jumper on the
defrost termination pins (30, 60 or 90) and placing the
jumper on the TEST pins after 24VAC is applied to the
control. The low pressure input is ignored in TEST mode.
The defrost system includes a defrost thermostat (S6) and a
defrost control (CMC1).
DEFROST CONTROL (CMC1)
This defrost control includes the combined functions of a
time/temperature defrost control, defrost relay, time delay,
diagnostic LEDs, and a terminal strip for field wiring
connections.
The defrost control provides automatic switching from
normal heating operation to defrost mode and back. When
the defrost thermostat is closed, the control accumulates
compressor run time at 30, 60 or 90 minute field adjustable
intervals. When the selected compressor run time interval is
reached, the defrost relay is energized and defrost begins.
Defrost Control Timing Pins (P1)
Each timing pin selection provides a different
accumulated compressor run time period for one defrost
cycle. This time period must occur before a defrost cycle is
initiated. The defrost interval can be adjusted to 30 (T1),
60 (T2), or 90 (T3) minutes (see figure 17). The maximum
defrost period is 14 minutes and cannot be adjusted.
NOTE — Defrost control part number is listed near the P1
timing pins.
Factory default is 90 minutes.
If the timing selector jumper is missing, the defrost
control defaults to a 90-minute defrost interval.
Compressor Delay (P5)
The defrost control has a field-selectable function to reduce
occasional sounds that may occur while the unit is cycling in
and out of the defrost mode.
The compressor will be cycled off for 30 seconds going in
and out of the defrost mode when the compressor delay
jumper is installed.
NOTE — The 30‐second compressor feature is ignored
when the TEST pins have been jumper.
IMPORTANT
The TEST pins are ignored and the TEST function is
locked out:
S If the jumper is applied on the TEST pin before 24VAC
is applied to the control.
S If there is a jumper on the 30 or 60 minute defrost ter
mination pins.
Bypass-Anti-Short Cycle Delay
The Y1 input must be active ON, the high pressure switch
must be closed or a jumper must be installed on the high
pressure terminals of the control.
Initiate a Force Defrost
The Y1 input must be active ON, the high pressure switch
must be closed or a jumper must be installed on the high
pressure terminals of the control, the defrost thermostat
must be closed or a jumper must be placed across the DF
terminals on the control and the O terminals must not have
24VAC (no power to reversing valve) before control will enter
into a force defrost.
Test Mode Sequence
Using the defrost termination pin, short the TEST pins for a
period of two seconds:
Clear timed lockout / or pressure switch lockout
function.
Enter defrost mode
After entering force defrost, if the jumper is removed before
5 seconds has elapsed, the unit will remain in forced defrost
mode until defrost thermostat opens or terminated on
maximum defrost time (14 minutes). If the jumper is not
removed, once 5 seconds has elapsed (7 seconds total), the
unit will terminate defrost and return to heat mode. The
TEST mode will then be lockedout and no further TEST
mode operation will be executed until the jumper on the
TEST pins is removed and reapplied to the applicable
defrost termination pins.
Page 14
Page 15
IMPORTANT
Homeowners Information
NOTE - After testing has been completed, properly reposi
tion test jumper across desired timing pins.
DEFROST CONTROL (CMC1)
DEFROST TIMING
PINS (P1)
TEST
PINS
DIAGNOSTIC
COMPRESSOR
DELAY PINS
REVERSING
VALV E
S87
LOW PRESSURE
SWITCH
DEFROST
THERMOSTAT (S6)
S4
HIGH PRESSURE
SWITCH
LEDS
24V TERMINAL
STRIP
CONNECTIONS
SERVICE LIGHT
CONNECTIONS
FIGURE 17
Service Light Connection
The defrost control includes terminal connections for a
service light which provides a signal that activates the room
thermostat service light during periods of inefficient
operation.
Defrost Control Diagnostic LEDs
The defrost board uses two LEDs for diagnostics. The LEDs
flash a specific sequence according to the condition.
TABLE 4
DEFROST CONTROL (CMC1) DIAGNOSTIC LEDS
Mode Green LED (DS2) Red LED (DS1)
No power to control OFF OFF
Normal operation /
power to control
Anti‐short cycle
lockout
High pressure switch
fault
High pressure switch
lockout
Simultaneous Slow FLASH
Alternating Slow FLASH
Slow FLASH OFF
ON OFF
HIGH PRESSURE SWITCH (S4)
This unit is equipped with a high pressure switch which is
located on the liquid line. The SPST, normally closed
pressure switch opens when liquid line pressure rises above
the factory setting of 590 + 15 psig and automatically resets
at 418 + 15 psig.
CAUTION
Before attempting to perform any service or maintenance,
turn the electrical power to unit OFF at disconnect switch.
Cleaning of the outdoor unit's coil should be performed by a
licensed professional service technician (or equivalent).
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.
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, soak
ers, waste water, etc.) will corrode the surface of steel
and aluminum parts, diminish performance and af
fect 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.
Keep snow level below the louvered panels to ensure
proper performance.
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.
NOTE — The filter and all access panels must be in place
any time the unit is in operation. If you are unsure about the
filter required for your system, call your Lennox dealer for
assistance.
1. 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 filters should be replaced with a filter of the
same type and size.
3. The indoor 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.)
Page 15
13HPX SERIES
Page 16
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.
13HPX Start-Up and Performance Checklist
Customer Address
Indoor Unit Model Serial
Outdoor Unit Model Serial
Notes:
START UP CHECKS
Refrigerant Type:
Rated Load Amps: Actual Amps Rated Volts
Condenser Fan Full Load Amps Actual Amps:
COOLING MODE
Suction Pressure: Liquid Pressure:
Supply Air Temperature: Ambient Temperature: Return Air: Temperature:
System Refrigerant Charge (Refer to manufacturer's information on unit or installation instructions for required
subcooling and approach temperatures.)
Subcooling:
Saturated Condensing Temperature (A)
minus Liquid Line Temperature (B)
Approach:
Liquid Line Temperature (A)
minus Outdoor Air Temperature (B)
Indoor Coil Temperature Drop (18 to 22°F) A — B = COIL TEMP DROP
Return Air Temperature (A)
minus Supply Air Temperature (B)
A — B = SUBCOOLING
A — B = APPROACH
Actual Volts
Page 16
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