Lennox XP14-018-230, XP14-024-230, XP14-030-230, XP14-036-230, XP14-042-230 Installation Instructions Manual
...Page 1
INSTALLATION
E2015 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
GENERAL
This XP14 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 Len
nox XP14 Product Specifications bulletin (EHB) for ap
proved indoor component match ups.
These instructions are intended as a general guide and
do not supersede local codes in any way. Consult authori
ties having jurisdiction before installation.
CAUTION
Before attempting to perform any service or mainte
nance, turn the electrical power to unit OFF at discon
nect switch.
INSTRUCTIONS
Elite® Series XP14 Units
HEAT PUMP
507362-01
8/2015
Supersedes 7/2014
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal in
jury or loss of life.
Installation and service must be performed by a li
censed professional installer (or equivalent) or service
agency.
NOTICE !
Charging information is given on the charging pro
cedure sticker on the unit access panel. For more
in-depth information, consult the Installation and
Service Procedures manual, available as Corp.
0721-L7 on DaveNet or through the Technical Sup
port department at 800-453-6669.
Litho U.S.A.
STEP 1 -- SETTING THE UNIT -- Clearances
NOTES:
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. (305mm)
and the final side may be 6 in.(152 mm).
A clearance of 24 in. (610 mm) must be maintained between two units.
48 in. (1219 mm) clearance required on top of unit.
FIGURE 1
See
NOTES
See NOTES
See NOTES
See
NOTES
Control
Box
Page 1
Page 2
UNIT DIMENSIONS - INCHES (MM)
A
LIQUID LINE
CONNECTION
ELECTRICAL INLETS
SUCTION LINE
CONNECTION
C
4-1/2”
(108)
SIDE VIEW
Model Number A B C
XP14-018-230 39 (991)
XP14-024-230 39 (991)
XP14-030-230 39 (991)
XP14-036-230 35 (889)
XP14-042-230 39 (991)
XP14-048-230 39 (991)
XP14-060-230 45 (1143)
UNIT SUPPORT FEET
13-7/8
(352)
7-3/4
(197)
3-1/4
(83)
27-1/8
(689)
XP14-018 AND -036 BASE WITH
ELONGATED LEGS (MEDIUM)
4-3/4”
(121)
UNIT SUPPORT FEET
20-5/8
K
(524)
4-1/2
J
(114)
3-5/8
(92)
B
TOP VIEW
30-1/2 (775) 35 (889)
35-1/2 (902) 39-1/2 (1003)
16-7/8
(429)
8-3/4
(222)
3-1/8
(79)
30-3/4
(781)
XP14-042 TO -060 BASE WITH
ELONGATED LEGS (LARGE)
26-7/8
(683)
3-3/4
(95)
4-5/8
(117)
STEP 1 -- SETTING THE UNIT
(Continued) -- Unit Placement
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.
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.
Page 2
XP14 SERIES
Page 3
IMPORTANT !
Exhaust vents from dryers, water heaters and
furnaces should be directed away from the outdoor
unit. Prolonged 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.
TWO 90° ELBOWS INSTALLED IN LINE SET
WILL REDUCE LINE SET VIBRATION.
FIGURE 2
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
ELEVATED SLAB MOUNTING USING FEET
EXTENDERS
2” (50.8MM) SCH 40
FEMALE THREADED
ADAPTER
2” (50.8MM)
SCH 40 MALE
THREADED
ADAPTER
LEG DETAIL
Use additional 2” SCH 40 male
threaded adapters which can
be threaded into the female
threaded adapters to make
additional adjustments to level
the unit.
BASE
FIGURE 4
STABILIZING UNIT ON UNEVEN SURFACES
#10 X 1/2” LONG
SELF-TAPPING
SHEET METAL
SCREWS
STABILIZING BRACKET
(18 GAUGE METAL — 2”
WIDTH; HEIGHT AS
REQUIRED)
#10 X 1-1/4” LONG
HEX HD SCREW AND
FLAT WASHER
Concrete slab — use two
plastic anchors (hole drill 1/4”)
CORNER POST
COIL
BASE PAN
MOUNTING
SLAB
GROUND LEVEL
FIGURE 3
IMPORTANT !
This model is designed for use in check / expan
sion 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.
! IMPORTANT !
Unit Stabilizer Bracket Use
(field-provided):
Always use stabilizers when unit is raised
above the factory height.
(Elevated units could become unstable in
gusty wind conditions.)
Stabilizers may be used on any unit installed
on unstable and uneven surfaces.
FIGURE 5
Page 3
XP14 SERIES
Page 4
STEP 2 -- REFRIGERANT PIPING
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 instal
lation. 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
system performance and capacity.
Failure to properly flush the system per this in
struction and the detailed Installation and Service
Procedures 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.
Flush the existing line set per the following instruc
tions. For more information, refer to the Installation
and Service Procedures manual available on Dave
Net. CAUTION - DO NOT attempt to flush and re-use
existing line sets or indoor coil when the system con
tains contaminants (i.e., compressor burn out).
If a new line set is being installed, size the piping per table 1.
TABLE 1
REFRIGERANT LINE SET — INCHES (MM)
Valve Field Con
Model
-018
-024
-030
-036
-042
-048
-060
NOTE - Some applications may require a field-provided 7/8” to 1-1/8”
adapter
nections
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)
7/8 in.
(22 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)
7/8 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, refer to the Refrigerant Piping Design and Fabrica
tion Guidelines manual available on DaveNet (Corp.
9351-L9), or contact the Technical Support Department
Product Application group for assistance.
NOTE - For new or replacement line set installation, refer
to Service and Application Note - Corp. 9112-L4 (C-91-4).
WARNING
Fire, Explosion and Personal Safety Haz
ard. Failure to follow this warning could
result in damage, personal injury or
death.
Never use oxygen to pressurize or purge
refrigeration lines. Oxygen, when ex
posed 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
pressure goes below 20 psig. A hissing sound will
be heard when the compressor is running un
loaded. Protector will reset when low pressure in
system is raised above 40 psig. DO NOT REPLACE
COMPRESSOR.
Page 4
XP14 SERIES
Page 5
STEP 2 -- REFRIGERANT PIPING -- (Continued)
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
(UNCASED COIL ONLY)
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
2
VAPOR LINE
SERVICE VALVE
EXISTING
INDOOR
UNIT
LIQUID LINE SERVICE
VALV E
RECOVERY
CYLINDER
LIQUID
D
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.
CYLINDER CONTAINING
CLEAN HCFC-22 TO BE
USED FOR FLUSHING
(Positioned to deliver liquid
refrigerant)
A
1
B
VAPOR
NEW
OUTDOOR
UNIT
C
GAUGE
MANIFOLD
LOW HIGH
OPENED
TANK
RETURN
INLET
DISCHARGE
RECOVERY MACHINE
CLOSED
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
RING
SENSING
LIQUID LINE
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER
LINE FITTING
SENSING BULB
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.
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 set and indoor
unit coil.
B - Position the cylinder of clean HCFC-22 for delivery of liquid
C - After all of the liquid refrigerant has been recovered, switch the
D - Close the valve on the inverted HCFC-22 drum and the gauge set
B
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.
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.
valves. Pump the remaining refrigerant out of the recovery
machine and turn the machine off.
®
LINE
LIQUID
LINE
®
FIGURE 6
Page 5
XP14 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 vapor and liquid line service
ports.
SERVICE PORT
CAP
SERVICE
PORT
CORE
LIQUID LINE SERVICE
VALV E
VAPOR LINE SERVICE
VALV E
ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND 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
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 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
VAPOR SERVICE PORT MUST BE OPEN
TO ALLOW EXIT POINT FOR NITROGEN
VAPOR LINE
INDOOR
UNIT
LIQUID LINE
C
LIQUID LINE SERVICE
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.
VAPOR LINE
SERVICE
VALV E
VALV E
FIGURE 7
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
XP14 SERIES
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 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.
6
Cloths must remain water-saturated throughout the brazing and cool-down process.
LIQUID LINE SERVICE VALVE
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
IMPORTANT — Allow braze joint to cool. Apply
additional water-saturated cloths to help cool brazed
joint. Do not remove water-saturated cloths until
piping has cooled. Temperatures above 250ºF will
damage valve seals.
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.
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.
VAPOR LINE
SERVICE VALVE
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
WATER-SATURATED
CLOTH
FIGURE 8
Page 7
XP14 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 XP14 Product Specifications bulletin (EHB) for approved expansion valve kit match-ups and
application information. The check expansion valve unit can be installed internal or external to the indoor coil. In applica
tions where an uncased coil is being installed in a field-provided plenum, install the check/expansion valve in a manner
that will provide access for future field service of the expansion valve. Refer to below illustration for reference during
installation of expansion valve unit.
INDOOR EXPANSION VALVE INSTALLATION
TWO PIECE
PATCH PLATE
(UNCASED
COIL ONLY)
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER LINE
FITTING (SEE
EQUALIZER LINE
INSTALLATION FOR
FURTHER DETAILS)
(Uncased Coil Shown)
LIQUID LINE
ORIFICE
HOUSING
STUB
END
TEFLON
RING
EQUALIZER
LINE
VAPOR
CHECK
EXPANSION
VALV E
®
ASSEMBLY WITH
LINE
TEFLON
RING
LIQUID LINE
BRASS NUT
LIQUID LINE
Sensing bulb insulation is required if
mounted external to the coil casing. sensing
bulb installation for bulb positioning.
EQUALIZER LINE INSTALLATION
1 - 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.
2 - Remove the field-provided fitting that temporarily recon
nected the liquid line to the indoor unit's distributor as
sembly.
®
SENSING
LINE
3 - Install one of the provided Teflon® rings around the
stubbed end of the check expansion valve and lightly
lubricate the connector threads and expose surface of
the Teflon® ring with refrigerant oil.
4 - Attach the stubbed end of the check expansion valve to
the liquid line orifice housing. Finger tighten and use an
appropriately sized wrench to turn an additional 1/2 turn
clockwise as illustrated in the figure above, or tighten to
20 ft-lb.
5 - 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.
6 - Attach the liquid line assembly to the check expansion
valve. Finger tighten and use an appropriately sized
wrench to turn an additional 1/2 turn clockwise as
illustrated in the figure above or tighten to 20 ft-lb.
SENSING BULB INSTALLATION
1 - Attach the vapor line sensing bulb in the proper
orientation as illustrated to the right using the clamp and
screws provided.
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 once installed.
2 - Connect the equalizer line from the check expansion
valve to the equalizer vapor port on the vapor line. Finger
tighten the flare nut plus 1/8 turn (7 ft-lbs) as illustrated
below.
VAPOR LINE
BULB
12
ON LINES SMALLER THAN
7/8”, MOUNT SENSING
BULB AT EITHER THE 3 OR
9 O'CLOCK POSITION.
BULB
®
1/2 Turn
11
10
9
8
7
1/8 Turn
11
10
9
8
7
12
1
2
3
4
5
6
12
1
2
3
4
5
6
FLARE SEAL CAP
OR
FLARE NUT
COPPER FLARE
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
VAPOR LINE
FIGURE 9
Page 8
VAPOR LINE
12
BULB
NOTE - NEVER MOUNT THE SENSING BULB ON
BOTTOM OF LINE.
BULB
ON 7/8” AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION.
XP14 SERIES
Page 9
STEP 3 -- LEAK TEST AND EVACUATION
LEAK TEST
HIGH
MANIFOLD GAUGE SET
TO VAPOR
SERVICE VALVE
OUTDOOR UNIT
A
NITROGEN
CONNECT GAUGE SET
HFC-410A
LOW
B
NOTE - Position
canister to deliver
liquid refrigerant.
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.
NOTE - Later in the procedure, the HFC-410A container will be replaced by the nitrogen container.
TEST FOR LEAKS
2
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:
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
XP14 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
NOTE - Position can
ister to deliver liquid
refrigerant.
HFC-410A
VACUUM PUMP
OUTDOOR
EVACUATION
UNIT
A
B
1/4 SAE TEE WITH SWIVEL
COUPLER
500
C
MICRON
GAUGE
GAUGE SET
TO VAPOR
SERVICE VALVE
TO LIQUID LINE
SERVICE VALVE
LOW
MANIFOLD
D
EVACUATE THE SYSTEM
4
A - Open both manifold valves and start the vacuum pump.
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:
S Close manifold gauge valves.
S Close valve on vacuum pump.
S Turn off vacuum pump.
S Disconnect manifold gauge center port hose from vacuum pump.
S Attach manifold center port hose to a nitrogen cylinder with pressure
regulator set to 150 psig (1034 kPa) and purge the hose.
S Open manifold gauge valves to break the vacuum in the line set and indoor
unit.
S 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:
S Close manifold gauge valves.
S Shut off HFC-410A cylinder.
S Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core
tool while maintaining a positive system pressure.
S Replace stem caps and finger tighten them, then tighten an additional one-sixth (1/6) of a turn as illustrated.
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.
WARNING !
RECOMMEND
MINIMUM 3/8” HOSE
11
10
9
8
1/6 TURN
12
7
6
HIGH
1
2
3
4
5
FIGURE 11
Page 10
XP14 SERIES
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 cur
rent 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 properly
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.
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 slug
ging.
Fire Hazard. Use of aluminum wire with this product
may result in a fire, causing property damage, severe
injury or death. Use copper wire only with this
product.
Failure to use properly sized wiring and circuit breaker
may result in property damage. Size wiring and circuit
breaker(s) per Product Specifications bulletin (EHB)
and unit rating plate.
ELECTROSTATIC
DISCHARGE
(ESD)
Precautions and
Procedures
WARNING
CAUTION
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
1
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
2
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
XP14 SERIES
Page 12
Unit Low Voltage Wiring
3
A
THERMOSTAT INDOOR UNIT
24V POWER
R
C
COMMON
W1
1ST‐STAGE
AUXILIARY
HEAT
G
INDOOR BLOWER
O
REVERSING VALVE
Y1
COMPRESSOR
(SOME CONNECTIONS MAY NOT APPLY. REFER
TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)
C
CUTOUT WITH
GROMMET
24V CONTROL WIRES
Typical 24VAC Control Wiring Diagrams (Field Installed)
R
24V POWER
C
COMMON
W1
1ST‐STAGE
AUXILIARY
W2
W3
G
HEAT
WIRE NUTS
BLACK
B
OUTDOOR UNIT
YELLOW
R
C
W1
O
Y1
C - Make 24VAC control wire connections using field provided
D
TIGHTEN WIRE TIE
FIGURE 13
HIGH VOLTAGE FIELD WIRING
FACTORY WIRING
LOW VOLTAGE (24V) FIELD WIRING
WIRE RUN LENGTH AWG# INSULATION TYPE
LESS THAN 100' (30 METERS) 18 TEMPERATURE RATING
MORE THAN 100' (30 METERS) 16 35ºC MINIMUM.
A - Run 24VAC control wires through cutout with grommet.
B - Run 24VAC control wires through wire tie.
wire nuts.
D - Tighten wire tie to security 24V control wiring.
NOTE - FOR PROPER VOLTAGES, SELECT THERMOSTAT WIRE (CONTROL
WIRES) GAUGE PER TABLE ABOVE.
NOTE - WIRE TIE PROVIDES LOW VOLTAGE WIRE STRAIN RELIEF AND
MAINTAINS SEPARATION OF FIELD-INSTALLED LOW AND HIGH VOLTAGE
CIRCUITS.
NOTE - DO NOT BUNDLE ANY EXCESS 24VAC CONTROL WIRES INSIDE
CONTROL BOX.
THERMOSTAT
R
24V POWER 24V POWER
C
COMMON
E
EMERGENCY
HEAT
W1
1ST‐STAGE
AUXILIARY
HEAT
G
INDOOR BLOWER
O
REVERSING VALVE
Y1
COMPRESSOR
(SOME CONNECTIONS MAY NOT APPLY. REFER TO
SPECIFIC THERMOSTAT AND INDOOR UNIT.)
INDOOR UNIT OUTDOOR UNIT
W1
W2
W3
R
C
G
COMMON
1ST‐STAGE
AUXILIARY
HEAT
R
C
EMERGENCY
HEAT RELAY
OUTDOOR
THERMOSTAT
W1
O
Y1
WARNING! - ELECTRIC SHOCK HAZARD. Can cause INJURY
or DEATH. Unit must be grounded in accordance with national
and local codes.
NOTE - For use with copper conductors only. Refer to unit rating
plate for minimum circuit ampacity and maximum over‐current
protection size.
FIGURE 14
Page 12
XP14 SERIES
Page 13
STEP 5 -- UNIT START-UP
IMPORTANT
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
vapor line service valve stems to release the refriger
ant charge (contained in outdoor unit) into the sys
tem.
4 - Replace the stem caps and tighten to the value listed
in table 2.
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 volt
age 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 refrigerant using the pro
cedures outlined under Checking Refrigerant
Charge.
OPERATING MANIFOLD GAUGE SET AND
SERVICE VALVES
The liquid and vapor line service valves are used for re
moving 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 15 and 16 provide
information on how to access and operate both angleand ball-type service valves.
Torque Requirements
When servicing or repairing heating, ventilating and air
conditioning components, ensure the fasteners are ap
propriately tightened. Table 2 lists torque values for fas
teners.
TABLE 2
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
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 sys
tems must be capable of handling the higher system op
erating 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 wrench 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
FIGURE 15
Page 13
XP14 SERIES
Page 14
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.
Checking Refrigerant Charge
The XP14 unit is factory-charged with enough HFC-410A
refrigerant to accommodate a 15-foot length of refrigerant
piping. Charge should be checked and adjusted us
ing the tables provided on the charging procedure
sticker on the unit access panel. Detailed information
is given in the XP14 Installation and Service Procedures
manual, which is available on DaveNet.
Defrost System
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.
(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 16
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:
S With torque wrench, finger tighten and torque
cap per table 2.
S Without torque wrench finger tighten and
use an appropriately sized wrench to turn
an additional 1/6 turn clockwise.
10
9
8
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:
S With torque wrench, finger tighten and
then torque cap per table 2.
S Without torque wrench, finger tight
en and use an appropriately sized
wrench to turn an additional 1/12
turn clockwise.
11
10
9
8
7
11
7
12
6
1/6 TURN
12
1
5
6
1/12 TURN
1
5
2
4
2
3
4
FIGURE 17
3
Page 14
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 18
The defrost control provides automatic switching from
normal heating operation to defrost mode and back.
When the defrost thermostat is closed, the control accu
mulates 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 accumu
lated compressor run time period for one defrost cycle.
This time period must occur before a defrost cycle is ini
tiated. The defrost interval can be adjusted to 30 (T1),
60 (T2), or 90 (T3) minutes (see figure 18). The maxi
mum defrost period is 14 minutes and cannot be ad
justed.
NOTE - Defrost control part number is listed near the P1
timing pins.
S Factory default is 90 minutes.
S If the timing selector jumper is missing, the defrost
control defaults to a 90-minute defrost interval.
XP14 SERIES
Page 15
Compressor Delay (P5)
The defrost control has a field-selectable function to re
duce 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 jumpering the TEST pins.
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.
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
termination 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:
S Clear timed lockout / or pressure switch lockout func
tion.
S Enter defrost mode.
After entering force defrost, if the jumper is removed be
fore 5 seconds has elapsed, the unit will remain in forced
defrost mode until defrost thermostat opens or termin
ated 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 fur
ther TEST mode operation will be executed until the
jumper on the TEST pins is removed and reapplied to the
applicable defrost termination pins.
IMPORTANT
After testing has been completed, properly reposition test
jumper across desired timing pins.
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 condi
tion.
TABLE 3
DEFROST CONTROL (CMC1) DIAGNOSTIC LEDS
Mode Green LED (DS2) Red LED (DS1)
No power to con
trol
Normal operation /
power to control
Anti‐short cycle
lockout
High pressure
switch fault
High pressure
switch lockout
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 automati
cally resets at 418 + 15 psig.
OFF OFF
Simultaneous Slow FLASH
Alternating Slow FLASH
Slow FLASH OFF
ON OFF
Homeowners Information
CAUTION
Before attempting to perform any service or mainte
nance, turn the electrical power to unit OFF at discon
nect switch.
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.
In order to ensure peak performance, your system must
be properly maintained. Clogged filters and blocked air
flow prevent your unit from operating at its most efficient
level. The system should be inspected and serviced be
fore each cooling and heating season by a licensed pro
fessional HVAC service technician (or equivalent).
Page 15
XP14 SERIES
Page 16
Heat Pump Operation
Your new Lennox heat pump has several characteristics
that you should be aware of:
S 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 fur
nace which deliver lower volumes of considerably hot
ter air to heat the space.
S 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
45F (7C). An electronic control activates a defrost
cycle lasting 5 to 15 minutes at preset intervals to clear
the outdoor coil of the frost.
S 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 de
frost cycle to satisfy a heating demand; however, the
unit will return to normal operation at the conclusion of
the defrost cycle.
Homeowner Maintenance
The following maintenance may be performed by the
homeowner.
S Contact a licensed professional HVAC technician to
schedule inspection and maintenance appointments for
your equipment before each heating and cooling season.
S Check the indoor unit filter each month and replace the
filter, if necessary.
Have your Lennox dealer show you where your indoor
unit filter is located. It will be either at the indoor unit (in
stalled internal or external to the cabinet) or behind a re
turn air grille in the wall or ceiling. Check the filter
monthly and clean or replace it as needed.
Disposable filters should be replaced with a filter of the
same type and size.
S Check the indoor unit drain line for obstructions
monthly. The indoor coil is equipped with a drain pan to
collect condensate formed as your system removes hu
midity from the inside air. Have your dealer show you
the location of the drain line and how to check for ob
structions. (This would also apply to an auxiliary drain,
if installed.)
S Check the area around the outdoor unit monthly and re
move any obstructions that may restrict airflow to the
outdoor unit. This would include grass clippings,
leaves, or papers that may have settled around the unit.
S Trim shrubbery away from the unit and periodically
check for debris which collects around the unit.
S During the winter months, keep the snow level below
the louvered panels.
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.
IMPORTANT !
Sprinklers and soaker hoses should not be
installed where they could cause prolonged expo
sure to the outdoor unit by treated water. Pro
longed exposure of the unit to treated water (i.e.,
sprinkler systems, soakers, waste water, etc.) will
corrode the surface of steel and aluminum parts,
diminish performance and affect longevity of the
unit.
Thermostat Operation
See the thermostat homeowner manual for instructions
on how to operate your thermostat.
Pre-Service Check
If your system fails to operate, check the following before
calling for service:
S Verify room thermostat settings are correct.
S Verify that all electrical disconnect switches are ON.
S Check for any blown fuses or tripped circuit breakers.
S Verify unit access panels are in place.
S Verify air filter is clean.
S If service is needed, locate and write down the unit
model number and have it handy before calling.
Extended Power Outage
The heat pump is equipped with a compressor crankcase
heater which protects the compressor during cold weath
er 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 sat
isfied 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.
Professional Maintenance
Your heating and air conditioning system should be in
spected and maintained twice each year (before the start
of the cooling and heating seasons) by a licensed profes
sional HVAC technician. You can expect the technician to
check the following items. These checks may only be
conducted by a licensed professional HVAC techni
cian.
Outdoor Unit
1 - Inspect component wiring for loose, worn or dam
aged connections. Also check for any rubbing or
pinching of wires. Confirm proper voltage plus am
perage of outdoor unit.
2 - Check the cleanliness of outdoor fan and blade condi
tion (cracks) and clean or replace them, if necessary.
3 - Inspect base pan drains for debris and clean as ne
cessary.
4 - Inspect the condition of refrigerant piping and confirm
that pipes are not rubbing copper-to-copper. Also,
Page 16
XP14 SERIES
Page 17
check the condition of the insulation on the refrigerant
lines. Repair, correct, or replace as necessary.
5 - Test capacitor. Replace as necessary.
Also, ensure that refrigerant pipes are not being af
fected by indoor air contamination. Check condition
of insulation on the refrigerant lines. Repair, correct,
or replace as necessary.
6 - Inspect contactor contacts for pitting or burn marks.
Replace as necessary.
7 - Check outdoor fan motor for worn bearings/bush
ings. Replace as necessary.
8 - Inspect and clean outdoor coils, if necessary and
note any damage to coils or signs of leakage.
Indoor Unit (Air Handler or Furnace)
1 - Inspect component wiring for loose, worn or dam
aged connections. Confirm proper voltage plus am
perage of indoor unit.
2 - Inspect and clean or replace air filters in indoor unit.
3 - Check the cleanliness of indoor blower and clean
blower, if necessary.
4 - Inspect the indoor coil drain pans and condensate
drains for rust, debris, obstructions, leaks or cracks.
Pour water in pans to confirm proper drainage from
the pan through to the outlet of the pipe. Clean or re
place as necessary.
5 - Inspect and clean indoor coil, if necessary.
6 - Inspect the condition of the refrigerant lines and con
firm that pipes are not rubbing copper-to-copper.
7 - Inspect the duct system for leaks or other problems.
Repair or replace as necessary.
8 - Check for bearing/bushing wear on indoor blower
motor. Replace as necessary.
9 - If your heat pump is matched with a gas- or oil-fired
furnace for auxiliary heating, indoor unit service will
also include inspection and cleaning of the burners,
and a full inspection of the gas valve, heat exchanger
and flue (exhaust) system.
General System Test with System Operating
1 - Your technician should perform a general system
test. He will turn on the air conditioner to check oper
ating functions such as the startup and shutoff oper
ation. He will also check for unusual noises or odors,
and measure indoor/outdoor temperatures and sys
tem pressures as needed. He will check the refriger
ant charge per the charging sticker information on the
outdoor unit.
2 - Verify that system total static pressure and airflow
settings are within specific operating parameters.
3 - Verify correct temperature drop across indoor coil.
Page 17
XP14 SERIES
Page 18
XP14 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
Actual 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:
A — B = SUBCOOLING
Saturated Condensing Temperature (A)
minus Liquid Line Temperature (B)
Approach:
A — 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)
Page 18
XP14 SERIES
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