INSTALLATION
INSTRUCTIONS
E 2011 Lennox Industries Inc.
Dallas, Texas, USA
Elite® Series XP14 Units
HEAT PUMPS
506772−01
08/11
Litho U.S.A.
Supersedes 06/11
TABLE OF CONTENTS
Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
Caps and Fasteners Torque Requirements . . . . . . . .
Operating Gauge Set and Service Valves . . . . . . . . .
Recovering Refrigerant from Existing System . . . . .
Removing and Installing Panels . . . . . . . . . . . . . . . . .
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Indoor Refrigerant Metering Device Removal and
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HFCs, and HCFCs) as of July 1,
1992. Approved methods of recovery, recycling or
reclaiming must be followed. Fines and/or incarceration
may be levied for noncompliance.
Servicing and Weighing In Refrigerant for Units
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox’ Engineering Handbook. Coils
previously charged with HCFC−22 must be flushed.
Shipping and Packing List
Check the unit for shipping damage and listed times below
are intact. If damaged, or if parts are missing, immediately
contact the last shipping carrier.
NOTICE TO INSTALLER
UNIT PLACEMENT
It is critical for proper unit operation to place outdoor unit on an elevated
1 ꢀ Assembled XP14 outdoor unit
General
BRAZING LINE SET TO SERVICE VALVES
damagingthe service valve’s internal seals.
The XP14 outdoor unit uses HFC−410A refrigerant. This
unit must be installed with a matching indoor blower coil
and line set as outlined in the XP14 Engineering
Handbook. These outdoor units are designed for use in
check / expansion valve (CTXV) systems only and are not
to be used with other refrigerant flow control devices. An
indoor coil check / expansion valve approved for use with
HFC−410A must be ordered separately and installed prior
to operating the unit.
DEFROST OPERATION
It is critical for proper time / temperature defrost operation to set the
defrost termination pins (P1) on the defrost control prior to starting
Also note that a low pressure bypass switch is required when operating
08/11
506772−01
Page 1
*2P0811*
*P506772-01*
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Typical Unit Parts Arrangement
CONTROL PANEL
CAPACITOR (C12)
CONTACTOR−
1POLE (K1−1)
DEFROST CONTROL
(CMC1)
THERMAL
PROTECTION
SWITCH (S173)
GROUND
LUG
SWITCH
COVER
ONLY ON UNITS
USING EXTERNAL
SWITCH
COMPRESSOR
MUFFLER
5−TON UNIT
EXAMPLED HERE
DEFROST
THERMOSTAT (S6)
TRUE SUCTION
PORT
CHECK EXPANSION
VALVE
REVERSING
VALVE
LIQUID LINE FILTER
DRIER (BI−FLOW)
REVERSING VALVE
SOLENOID
CRANKCASE HEATER
(−036, −042, −048 AND
060 UNITS ONLY)
CHECK EXPANSION VALVE
SENSING BULB
CRANKCASE HEATER THERMOSTAT (S40)
(−036, −042, −048 AND 060 UNITS ONLY)
LOW PRESSURE
SWITCH (S87)
HIGH PRESSURE SWITCH
(AUTO−RESET) (S4)
VAPOR LINE SERVICE
VALVE
LIQUID LINE
SERVICE VALVE
FIELD CONNECTION
FOR VAPOR LINE
(BALL−TYPE −060 ONLY)
FIELD CONNECTION
FOR LIQUID LINE SET
PLUMBING, SWITCHES AND
SENSOR COMPONENTS
FIELD CONNECTION FOR VAPOR
LINE (ANGLE−TYPE − ALL SIZES
EXCEPT −060)
Figure 1. Typical Parts Arrangements
Page 3
XP14 SERIES
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B
To close rotate stem clockwise 90°.
Caps and Fasteners Torque Requirements
TO INDOOR UNIT
When servicing or repairing HVAC equipment and
components, ensure the fasteners are appropriately
fasteners.
BALL (SHOWN CLOSED)
VALVE STEM
2
Table 1. Torque Requirements
SERVICE PORT
Parts
Recommended Torque
SERVICE PORT CORE
SERVICE PORT CAP
Service valve cap
Sheet metal screws
Machine screws #10
Compressor bolts
Gauge port seal cap
8 ft.− lb.
11 NM
2 NM
16 in.− lb.
28 in.− lb.
90 in.− lb.
8 ft.− lb.
REMOVE
STEM CAP
TO OUTDOOR UNIT
3 NM
1
10 NM
11 NM
Figure 2. Operating Ball−Type Service Valve
ANGLE−TYPE SERVICE VALVE
Operating Gauge Set and Service Valves
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 to open the service valve.
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.
SERVICE PORT CAP
(VALVE STEM
SHOWN
OPEN)
SERVICE PORT CORE
USING MANIFOLD GAUGE SET
INSERT HEX
WRENCH
HERE
When checking the system charge, only use a manifold
gauge set that features low−loss anti−blow back fittings.
SERVICE PORT
CORE
Manifold gauge set used for HFC−410A refrigerant
systems must be capable of handling the higher system
operating pressures. The manifold gauges should be rated
for:
TO INDOOR
UNIT
S
S
S
High side ꢀ Pressure range of 0 − 800 pound−force per
square inch gauge (psig)
STEM CAP
TO OUTDOOR UNIT
Low side ꢀ Use with 30" vacuum to 250 psig with
dampened speed to 500 psig
When service valve is OPEN, the service port is open to line set,
indoor and outdoor unit.
Manifold gauge set hoses must be rated for use to 800
psig of pressure with a 4000 psig burst rating.
INSERT HEX−HEAD
EXTENSION HERE
OPERATING SERVICE VALVES
2
The liquid and vapor line service valves are used for
refrigerant recovery, flushing, leak testing, evacuating,
weighing in refrigerant and optimizing system charge.
TO INDOOR
UNIT
Each valve is equipped with a service port which has a
factory−installed valve core. Figure 3 provides information
on how to access and operate both angle− and ball−type
service valves.
TO OUTDOOR
UNIT
VALVE STEM
SHOWN
CLOSED
BALL−TYPE SERVICE VALVE
REMOVE
1
STEM CAP
1. Remove stem cap with an appropriately sized wrench.
When service valve stem is in the CLOSED position, the service
port is open to the line set and indoor unit.
2. Use an appropriately sized wrenched to open or close
valve.
A
To open rotate stem counterclockwise 90°.
Figure 3. Operating Angle−Type Service Valve
506728−01
Page 4
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To Access Service Port:
S
S
With Torque Wrench: Finger
A service port cap protects the service port core from
contamination and serves as the primary leak seal.
Without Torque Wrench: Finger tighten
and use an appropriately sized wrench to turn an
additional 1/12 turn clockwise.
1. Remove service port cap with an appropriately sized
wrench.
1/12 TURN
12
2. Connect gauge set to service port.
1
5
11
10
2
3. When testing is completed, replace service port cap and
tighten as follows:
9
3
4
8
7
6
S
S
With torque wrench: Finger tighten and torque cap per
table 1.
IMPORTANT
Only use Allen wrenches of sufficient hardness (50Rc −
Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.
Without torque wrench: Finger tighten and use an
appropriately sized wrench to turn an additional 1/6
turn clockwise.
1/6 TURN
12
6
1
5
11
10
Service valve stems are factory−torqued (from 9 ft−lbs for
small valves, to 25 ft−lbs for large valves) to prevent
refrigerant loss during shipping and handling. Using an
Allen wrench rated at less than 50Rc risks rounding or
breaking off the wrench, or stripping the valve stem
recess.
2
9
3
4
8
7
Reinstall Stem Cap:
See the Lennox Service and Application Notes
Corp.0807−L5 (C−08−1) for further details and
information.
Stem cap protects the valve stem from damage and serves
as the primary seal. Replace the stem cap and tighten as
follows:
Page 5
XP14 SERIES
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Recovering Refrigerant from Existing System
CONNECT MANIFOLD GAUGE SET
DISCONNECT POWER
Connect a manifold gauge set, clean recovery cylinder and a
recovery machine to the service ports of the existing unit.
Disconnect all power to the existing outdoor unit at the disconnect
switch and/or main fuse box/breaker panel.
2
1
NOTE ꢀ Use the recovery machine instructions to make
the correct manifold gauge set connections for recovery
refrigerant.The illustration below is a typical connection.
MAIN FUSE
BOX/BREAKER
PANEL
MANIFOLD GAUGES
DISCONNECT
SWITCH
RECOVERY MACHINE
LOW
HIGH
OUTDOOR UNIT
CLEAN RECOVERY
CYLINDER
RECOVERING REFRIGERANT
3
Remove existing HCFC−22 refrigerant using one of the following procedures:
METHOD 2 LIMITATIONS
METHOD 1:
Use Method 1 if the existing outdoor unit is not equipped with shut−off valves, or
if the unit is not operational and you plan to use the existing HCFC−22 to flush
the system.
NOTE ꢀ When using Method 2, the listed devices
below could prevent full system charge recovery into
the outdoor unit:
Recover all HCFC−22 refrigerant from the existing system using a recovery
machine and clean recovery cylinder. Check gauges after shutdown to confirm
that the entire system is completely void of refrigerant.
S
Outdoor unit’s high or low−pressure switches (if
applicable) when tripped can cycle the
compressor OFF.
S
S
Compressor can stop pumping due to tripped
internal pressure relief valve.
METHOD 2:
Use Method 2 if the existing outdoor unit is equipped with manual shut−off valves,
and you plan to use new HCFC−22 refrigerant to flush the system.
Compressor has internal vacuum protection that
is designed to unload the scrolls (compressor
stops pumping) when the pressure ratio meets a
certain value or when the suction pressure is as
high as 20 psig. (Compressor suction
pressuresshould never be allowed to go into
a vacuum. Prolonged operation at low suction
pressures will result in overheating of the
scrolls and permanent damage to the scroll
tips, drive bearings and internal seals.)
Perform the following task:
A
Start the existing HCFC−22 system in the cooling mode and close the liquid line
valve.
B
Use the compressor to pump as much of the existing HCFC−22 refrigerant into
the outdoor unit until the outdoor system is full. Turn the outdoor unit main power
OFF and use a recovery machine to remove the remaining refrigerant from the
system.
NOTE ꢀ It may be necessary to bypass the low pressure switches (if equipped) to
ensure complete refrigerant evacuation.
Once the compressor can not pump down to a lower
pressure due to any of the above mentioned system
conditions, shut off the vapor valve. Turn OFF the main
power to unit and use a recovery machine to recover
any refrigerant left in the indoor coil and line set.
C
D
When the low side system pressures reach 0 psig, close the vapor line valve.
Check gauges after shutdown to confirm that the valves are not allowing
refrigerantto flow back into the low side of the system.
Figure 4. Refrigerant Recovery
IMPORTANT
The Environmental Protection Agency (EPA) prohibits the intentional venting of HFC refrigerants during maintenance,
service, repair and disposal of appliance. Approved methods of recovery, recycling or reclaiming must be followed.
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.
506728−01
Page 6
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New Outdoor Unit Placement
ELEVATING THE UNIT
CAUTION
In order to avoid injury, take proper precaution when lift-
ing heavy objects.
Units are outfitted with elongated support feet as illustrated
If additional elevation is necessary, raise the unit by
extending the height of the unit support feet. This may be
achieved by using a 2 inch (50.8mm) schedule 40 female
threaded adapter.
Remove existing outdoor unit prior to placement of new
mounting slab, platforms or supports. Refer to figure 5 for
mandatory installation clearance requirements.
NOTE ꢀ Keep the height of extenders short enough to
ensure a sturdy installation. If it is necessary to extend
further, consider a different type of field−fabricated
framework that is sturdy enough for greater heights.
POSITIONING CONSIDERATIONS
Consider the following when positioning the unit:
ROOF MOUNTING
S
Some localities are adopting sound ordinances based
on the unit’s sound level registered from the adjacent
property, not from the installation property. Install the
unit as far as possible from the property line.
Install the unit a minimum of 6 inches (152 mm) above the
roof surface to avoid ice build−up around the unit. Locate
the unit above a load bearing wall or area of the roof that
can adequately support the unit. Consult local codes for
mounting considerations.
S
When possible, do not install the unit directly outside
a window. Glass has a very high level of sound
transmission. For proper placement of unit in relation
to a window see the provided illustration in figure 6,
detail A.
NOTICE
PLACING UNIT ON SLAB
Roof Damage!
When installing unit at grade level, the top of the slab
should be high enough above grade so that water from
higher ground will not collect around the unit. The slab
should have a slope tolerance as described in figure 6,
detail B.
This system contains both refrigerant and oil. Some
rubber roofing material may absorb oil and cause the
rubber to swell when it comes into contact with oil. The
rubber will then bubble and could cause leaks. Protect
the roof surface to avoid exposure to refrigerant and oil
during service and installation. Failure to follow this
notice could result in damage to roof surface.
NOTE ꢀ If necessary for stability, anchor unit to slab as
MINIMUM CLEARANCE
ABOVE UNIT
CLEARANCE ON ALL SIDES ꢀ INCHES (MILLIMETERS)
NOTES:
S
Service clearance of 30 inches (762 mm) must be
maintained on one of the sides adjacent to the
control panel
S
S
Clearanceto one of the other three sides must be 36
inches (914mm).
48 (1219)
Clearanceto one of the remaining two sides may be
12 inches (305mm) and the final side may be 6
inches (152mm).
CONTROL PANEL ACCESS
LOCATION
MINIMUM CLEARANCE BETWEEN TWO UNITS
24
(610)
Figure 5. Installation Clearances
Page 7
XP14 SERIES
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ꢀ Outside Unit Placement
DETAIL A
Install unit away from windows.
ꢀ Slab Mounting at Ground Level
DETAIL B
Install unit level or, if on a slope, maintain slope tolerance of two (2)
degrees (or two inches per five feet [50 mm per 1.5 m]) away from
building structure.
BUILDING
STRUCTURE
MOUNTING
SLAB
GROUND LEVEL
TWO 90° ELBOWS INSTALLED IN LINE SET WILL
REDUCE LINE SET VIBRATION.
Elevated Slab Mounting
DETAIL C ꢀ
ꢀ Slab Side Mounting
DETAIL D
using Feet Extenders
#10 1/2" LONG SELF−DRILLING
SHEET METAL SCREWS
COIL
STABILIZING BRACKET (18 GAUGE
METAL ꢀ 2" WIDTH; HEIGHT AS
REQUIRED)
BASE PAN
#10 1−1/4" LONG HEX HD SCREW
AND FLAT WASHER
CORNER POST
Concrete slab ꢀ use two plastic anchors (hole
drill 1/4")
BASE
Wood or plastic slab ꢀ no plastic anchor (hole
drill 1/8")
Stabilizing bracket (18 gauge metal ꢀ 2" (50.8mm) width; height as required); bend to form
right angle as exampled below.
LEG DETAIL
2" (50.8MM) SCH 40
FEMALE THREADED
ADAPTER
ꢀ Roof Top Mounting
DETAIL F
If unit coil cannot be mounted away from prevailing winter winds, a wind barrier should be
constructed. Size barrier at least the same height and width as outdoor unit. Mount barrier 24
inches (610 mm) from the sides of the unit in the direction of prevailing winds as illustrated.
2" (50.8MM) SCH 40
MALE THREADED
ADAPTER
PREVAILING WINTER WINDS
Use additional 2" SCH 40 male threaded adapters which
can be threaded into the female threaded adapters to
make additional adjustments to the level of the unit.
WIND BARRIER
INLET AIR
ꢀ Deck Top Mounting
DETAIL E
MINIMUM ONE
PER SIDE
One bracket per side
(minimum). For extra
INLET AIR
INLET AIR
stability, two brackets per
side, two inches (51mm)
from each corner.
SAME FASTENERS AS
SLAB SIDE MOUNTING.
FOR EXTRA
STABILITY
INLET AIR
Figure 6. Placement, Slab Mounting and Stabilizing Unit
506728−01
Page 8
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Removing and Installing Panels
LOUVERED PANEL REMOVAL
Remove the louvered panels as follows:
IMPORTANT! DO NOT ALLOW PANELS TO HANG ON UNIT BY TOP TAB. TAB IS FOR
ALIGNMENT AND NOT DESIGNED TO SUPPORT WEIGHT OF PANEL.
1. Remove two screws, allowing the panel to swing open
slightly.
PANEL SHOWN SLIGHTLY ROTATED TO ALLOW TOP TAB TO EXIT (OR
ENTER) TOP SLOT FOR REMOVING (OR INSTALLING) PANEL.
2. Hold the panel firmly throughout this procedure. Rotate
bottom corner of panel away from hinged corner post until
lower three tabs clear the slots as illustrated in detail B.
SCREW
HOLES
3. Move panel down until lip of upper tab clears the top slot in
corner post as illustrated in detail A.
LIP
LOUVERED PANEL INSTALLATION
Position the panel almost parallel with the unit as illustrated in
detail D with the screw side as close to the unit as possible.
Then, in a continuous motion:
Detail A
Detail B
1. Slightly rotate and guide the lip of top tab inward as
illustrated in detail A and C; then upward into the top
slot of the hinge corner post.
2. Rotate panel to vertical to fully engage all tabs.
3. Holding the panel’s hinged side firmly in place, close
the right−hand side of the panel, aligning the screw
holes.
4. When panel is correctly positioned and aligned, insert
the screws and tighten.
ROTATE IN THIS DIRECTION;
THEN DOWN TO REMOVE
PANEL
HOLD DOOR FIRMLY TO THE HINGED
SIDE TO MAINTAIN
FULLY−ENGAGED TABS
ANGLE MAY BE TOO
EXTREME
Detail C
PREFERRED ANGLE
FOR INSTALLATION
Detail D
MAINTAIN MINIMUM PANEL ANGLE (AS CLOSE TO
PARALLEL WITH THE UNIT AS POSSIBLE) WHILE
INSTALLING PANEL.
Figure 7. Removing and Installing Panels
WARNING
To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following:
While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause
injury to personnel, nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g.,
being bent or scratched).
While handling or stowing the panels, consider any weather conditions, especially windy conditions, that may cause
panels to be blown around and battered.
Page 9
XP14 SERIES
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Line Set Requirements
This section provides information on: installation of new or
replacement line set.
S
S
Model (XP14) and size of unit (e.g. −036).
Line set diameters for the unit being installed as listed
S
S
S
Adding Polyol ester oil requirements
New or replacement line set installation
Using existing line set.
S
Number of elbows vertical rise or drop in the piping.
USING EXISTING LINE SET
ADDING POLYOL ESTER OIL REQUIREMENTS
Things to consider:
S
S
S
Liquid line that meter the refrigerant, such as RFC1
liquid line, must not be used in this application.
IMPORTANT
Mineral oils are not compatible with HFC−410A. If oil
must be added, it must be a Polyol Ester oil.
Existing line set of proper size as listed in table 2 may
be reused.
If system was previously charged with HCFC−22
refrigerant, then existing line set must be flushed (see
The compressor is charged with sufficient Polyol Ester oil
(POE) for line set lengths up to 50 feet. Recommend
adding oil to system based on the amount of refrigerant
charge in the system. Systems with 20 pounds or less of
refrigerant required no oil to be added.
If existing line set is being used, then proceed to Brazing
For systems over 20 pounds − add one ounce for every five
(5) pounds of HFC−410A refrigerant.
IMPORTANT
Recommended topping−off POE oils are Mobil EAL
ARCTIC 22 CC or ICI EMKARATEt RL32CF.
Lennox highly recommends changing line set when
converting the existing system from HCFC−22 to
HFC−410A. If that is not possible and the line set is the
proper size as reference in table 2, use the procedure
outlined under Flushing Line Set and Indoor Coil on page
13.
NEW OR REPLACEMENT LINE SET INSTALLATION
Field refrigerant piping consists of both liquid and vapor
lines from the outdoor unit to the indoor coil. Use Lennox
L15 (sweat, non−flare) series line set, or field−fabricated
refrigerant line sizes as specified in table 2.
IMPORTANT
If refrigerant lines are routed through a wall, then seal and
isolate the opening so vibration is not transmitted to the
building. Pay close attention to line set isolation during
installation of any HVAC system. When properly isolated
from building structures (walls, ceilings. floors), the
refrigerant lines will not create unnecessary vibration and
subsequent sounds. See figure 8 for recommended
installation practices.
If this unit is being matched with an approved line set
or indoor unit coil which was previously charged with
mineral oil, or if it is being matched with a coil which
was manufactured before January of 1999, the coil
and line set must be flushed prior to installation. Take
care to empty all existing traps. Polyol ester (POE) oils
are used in Lennox units charged with HFC−410A
refrigerant. Residual mineral oil can act as an
insulator, preventing proper heat transfer. It can also
clog the expansion device, and reduce the system
performance and capacity.
NOTE ꢀ When installing refrigerant lines longer than 50
feet, see the Lennox Refrigerant Piping Design and
Fabrication Guidelines, CORP. 9351−L9, or contact
Lennox Technical Support Product Applications for
assistance. To obtain the correct information from Lennox,
be sure to communicate the following information:
Failure to properly flush the system per the
instructions below will void the warranty.
Table 2. Refrigerant Line Set ꢀ Inches (mm)
Valve Field Connections
Recommended Line Set
Model
Liquid Line
Vapor Line
Liquid Line
Vapor Line
L15 Line Sets
XP14−018−230
XP14−024−230
XP14−030−230
XP14−036−230
XP14−042−230
XP14−048−230
XP14−060−230
3/8 in. (10 mm)
3/4 in. (19 mm)
7/8 in. (22 mm)
3/8 in. (10 mm)
3/4 in. (19 mm)
L15−41 ꢀ 15 ft. − 50 ft. (4.6 m − 15 m)
3/8 in. (10 mm)
3/8 in. (10 mm)
3/8 in. (10 mm)
7/8 in. (22 mm)
L15−65 ꢀ 15 ft. − 50 ft. (4.6 m − 15 m)
1−1/8 in. (29 mm) 3/8 in. (10 mm)
1−1/8 in. (29 mm) Field Fabricated
NOTE ꢀ Some applications may required a field provided 7/8" to 1−1/8" adapter
506728−01
Page 10
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Line Set Isolation ꢀ The following illustrations are examples of proper refrigerant line set isolation:
REFRIGERANT LINE SET ꢀ INSTALLING
VERTICAL RUNS (NEW CONSTRUCTION SHOWN)
REFRIGERANT LINE SET ꢀ TRANSITION
FROM VERTICAL TO HORIZONTAL
NOTE ꢀ Insulate liquid line when it is routed through areas where the
surrounding ambient temperature could become higher than the
temperatureof the liquid line or when pressure drop is equal to or greater
than 20 psig.
ANCHORED HEAVY NYLON
WIRE TIE OR AUTOMOTIVE
AUTOMOTIVE
MUFFLER-TYPE HANGER
MUFFLER-TYPE HANGER
OUTSIDE WALL
LIQUID LINE
VAPOR LINE
WALL
STUD
WIRE TIE
INSIDE WALL
STRAP
WOOD BLOCK
BETWEEN STUDS
STRAP LIQUID LINE TO
VAPOR LINE
NON−CORROSIVE
METAL SLEEVE
WIRE TIE
LIQUID LINE
NON−CORROSIVE
METAL SLEEVE
VAPOR LINE − WRAPPED
IN ARMAFLEX
WOOD BLOCK
WIRE TIE
REFRIGERANT LINE SET ꢀ INSTALLING
HORIZONTAL RUNS
STRAP
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)
SLEEVE
8 FEET (2.43 METERS)
STRAPPING
MATERIAL (AROUND
VAPOR LINE ONLY)
VAPOR LINE WRAPPED
WITH ARMAFLEX
FLOOR JOIST OR
ROOF RAFTER
TAPE OR
WIRE TIE
OUTSIDE
WALL
LIQUID
LINE
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
PVC
PIPE
CAULK
FIBERGLASS
INSULATION
NOTE ꢀ Similar installation practices
should be used if line set is to be
installed on exterior of outside wall.
FLOOR JOIST OR
ROOF RAFTER
Figure 8. Line Set Installation
Page 11
XP14 SERIES
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Brazing Connections
Use the procedures outline in figures 9 and 10 for brazing line set connections to service valves.
WARNING
IMPORTANT
Polyol Ester (POE) oils used with HFC−410A
refrigerant absorb moisture very quickly. It is very
important that the refrigerant system be kept closed
as much as possible. DO NOT remove line set caps
or service valve stub caps until you are ready to make
connections.
Allow braze joint to cool before removing the wet rag
from the service valve. Temperatures above 250ºF can
damage valve seals.
IMPORTANT
Use silver alloy brazing rods with 5% minimum silver
alloy for copper−to−copper brazing. Use 45% minimum
alloy for copper−to−brass and copper−to−steel brazing.
WARNING
Danger of fire. Bleeding the refrigerant
charge from only the high side may result
in pressurization of the low side shell and
suction tubing. Application of a brazing
torch to a pressurized system may result
in ignition of the refrigerant and oil
mixture − Check the high and low
pressures before applying heat.
WARNING
Fire, Explosion and Personal Safety
Hazard.
Failure to follow this warning could
result in damage, personal injury or
death.
Never use oxygen to pressurize or
purge refrigeration lines. Oxygen,
when exposed to a spark or open
flame, can cause fire and/or an ex-
plosion, that could result in property
damage, personal injury or death.
CAUTION
Brazing alloys and flux contain materials which are
hazardous to your health.
Avoid breathing vapors or fumes from brazing
operations. Perform operations only in well−ventilated
areas.
WARNING
When using a high pressure gas such as
dry nitrogen to pressurize a refrigeration
or air conditioning system, use a
regulator that can control the pressure
down to 1 or 2 psig (6.9 to 13.8 kPa).
Wear gloves and protective goggles or face shield to
protect against burns.
Wash hands with soap and water after handling brazing
alloys and flux.
506728−01
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CAP AND CORE REMOVAL
CUT AND DEBUR
Cut ends of the refrigerant lines square (free from nicks or dents)
and debur the ends. The pipe must remain round. Do not crimp end
of the line.
Remove service cap and core from both the suction / vapor and
liquid line service ports.
2
1
CUT AND DEBUR
SERVICE PORT
CAP
SERVICE
PORT
CORE
LINE SET SIZE MATCHES
SERVICE VALVE CONNECTION
SERVICE VALVE
CONNECTION
SERVICE
PORT
CORE
COPPER TUBE
STUB
REDUCER
SUCTION / VAPOR LINE
SERVICE VALVE (BALL−TYPE
FOR −060 AND ANGLE−TYPE
FOR ALL OTHER SIZES)
LINE SET SIZE IS SMALLER
THAN CONNECTION
DO NOT CRIMP SERVICE VALVE
CONNECTOR WHEN PIPE IS
SMALLER THAN CONNECTION
REFRIGERANT LINE
ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE
VALVES
3
Flow regulated nitrogen (at 1 to 2 psig) through the low−side refrigeration gauge set into the liquid line service port valve, and out of the suction /
vapor line service port valve.
A
B
C
Connect gauge set low pressure side to liquid line service valve (service port).
Connect gauge set center port to bottle of nitrogen with regulator.
Remove core from valve in suction / vapor line service port to allow nitrogen to escape.
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
HIGH
LOW
ATTACH
GAUGES
SUCTION / VAPOR SERVICE PORT MUST BE
OPEN TO ALLOW EXIT POINT FOR NITROGEN
B
SUCTION /
VAPOR LINE
SERVICE
VALVE
C
VAPOR LINE
OUTDOOR
UNIT
INDOOR
UNIT
NITROGEN
LIQUID LINE SERVICE
VALVE
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
LIQUID LINE
A
Figure 9. Brazing Procedures
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WRAP SERVICE VALVES
To help protect service valve seals during brazing, wrap water saturated cloths around service valve bodies and copper tube stubs. Use
additionalwater saturated cloths underneath the valve body to protect the base paint.
4
FLOW NITROGEN
Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and
out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections
5
6
BRAZE LINE SET
Wrap both service valves with water saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Water
saturated cloths must remain water saturated throughout the brazing and cool−down process.
SUCTION / VAPOR LINE
SERVICE VALVE
LIQUID LINE SERVICE VALVE
VAPOR LINE SERVICE VALVE
COULD BE EITHER A ANGLE−TYPE
OR BALL−TYPE VALVE.
ANGLE−TYPE SERVICE
VALVE
WHEN BRAZING
LINE SET TO
SERVICE VALVES,
POINT FLAME
AWAY FROM
SERVICE VALVE.
WATER SATURATED
CLOTH
LIQUID LINE
SUCTION / VAPOR LINE
WATER SATURATED
CLOTH
WHEN BRAZING LINE SET TO SERVICE VALVES, POINT FLAME AWAY
FROM SERVICE VALVE.
PREPARATION FOR NEXT STEP
After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water saturated cloths to both
service valves to cool piping. Once piping is cool, remove all water saturated cloths.
7
Figure 10. Brazing Procedures (continued)
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.
WARNING
FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE may result if you do not wrap a water satu-
rated cloth around both liquid and suction line service valve bodies and copper tube stub while brazing
in the line set! The braze, when complete, must be quenched with water to absorb any residual heat.
Do not open service valves until refrigerant lines and indoor coil have been leak−tested and evacuated.
Refer to procedures provided in this supplement.
506728−01
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Indoor Refrigerant Metering Device Removal and Flushing Line Set and Indoor Coil
Flushing is only required when the existing system used HCFC−22 refrigerant. If the existing system used HFC−410a, then
remove the original indoor coil metering device and proceed to Installing New Indoor Metering Device on page 16.
TYPICAL EXISTING FIXED ORIFICE
REMOVAL PROCEDURE (UNCASED
COIL SHOWN)
TYPICAL EXISTING EXPANSION VALVE REMOVAL
PROCEDURE (UNCASED COIL SHOWN)
OR
1B
1A
STUB END
TWO PIECE PATCH PLATE
(UNCASED COIL ONLY)
LIQUID LINE
ORIFICE
HOUSING
CHECK
EXPANSION
VALVE
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR
TUBES
®
TEFLON
RING
®
TEFLON RING
FIXED ORIFICE
BRASS NUT
®
TEFLON
RING
SENSING
LINE
DISTRIBUTOR
ASSEMBLY
DISTRIBUTOR
ASSEMBLY
EQUALIZER
LINE
REMOVE AND DISCARD
®
WHITE TEFLON SEAL
(IF PRESENT)
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
A
B
On fully cased coils, remove the coil access and plumbing panels.
Remove any shipping clamps holding the liquid line and distributor as-
sembly.
MALE EQUALIZER
LINE FITTING
VAPOR
LINE
C
Using two wrenches, disconnect liquid line from liquid line orifice hous-
ing. Take care not to twist or damage distributor tubes during this pro-
cess.
LIQUID
LINE
SENSING BULB
A
B
On fully cased coils, remove the coil access and plumbing panels.
D
E
Remove and discard fixed orifice, valve stem assembly if present and
®
Teflon washer as illustrated above.
Remove any shipping clamps holding the liquid line and distributor
assembly.
Use a field−provided fitting to temporary reconnect the liquid line to the
indoor unit’s liquid line orifice housing.
C
Disconnect the equalizer line from the check expansion valve
equalizer line fitting on the vapor line.
D
E
Remove the vapor line sensing bulb.
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
Disconnect the liquid line from the check expansion valve at the liquid
line assembly.
2
INVERTED HCFC−22
GAUGE
MANIFOLD
F
Disconnect the check expansion valve from the liquid line orifice
housing.Take care not to twist or damage distributor tubes during this
process.
CYLINDER CONTAINS
CLEAN HCFC−22 TO BE
USED FOR FLUSHING.
A
®
G
H
Remove and discard check expansion valve and the two Teflon rings.
LOW
HIGH
1
Use a field−provided fitting to temporary reconnect the liquid line to the
indoor unit’s liquid line orifice housing.
NEW
OUTDOOR
UNIT
VAPOR LINE
SERVICE VALVE
FLUSHING LINE SET
OPENED
CLOSED
The line set and indoor unit coil must be flushed with at least the
same amount of clean refrigerant that previously charged the
system. Check the charge in the flushing cylinder before
proceeding.
EXISTING
INDOOR
UNIT
3
B
LIQUID LINE SERVICE
VALVE
A
Set the recovery machine for liquid recovery and start the
recovery machine. Open the gauge set valves to allow the
RECOVERY
CYLINDER
TANK
RETURN
rBecovery machine to pull a vacuum on the existing system line
set and indoor unit coil.
C
B
Invert the cylinder of clean HCFC−22 and open its valve to allow
liquid refrigerant to flow into the system through the vapor line
valve. Allow the refrigerant to pass from the cylinder and through
the line set and the indoor unit coil before it enters the recovery
machine.
INLET
D
DISCHARGE
RECOVERY MACHINE
A
Inverted HCFC−22 cylinder with clean refrigerant to the vapor service
valve.
C
D
After all of the liquid refrigerant has been recovered, switch the
recovery machine to vapor recovery so that all of the HCFC−22
vapor is recovered. Allow the recovery machine to pull down to 0
the system.
B
C
HCFC−22 gauge set (low side) to the liquid line valve.
HCFC−22 gauge set center port to inlet on the recovery machine with an
empty recovery tank to the gauge set.
Close the valve on the inverted HCFC−22 drum and the gauge
set valves. Pump the remaining refrigerant out of the recovery
machine and turn the machine off.
D
Connect recovery tank to recovery machines per machine instructions.
Figure 11. Removing Indoor Refrigerate Metering Device and Flushing Procedures
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Installing New Indoor Metering Device
This outdoor unit is designed for use in HFC−410A systems that use a check / expansion valve metering device (purchased
separately) at the indoor coil.
See the Lennox XP14 Engineering Handbook for approved check / expansion valve kit match−ups. The check / expansion
valve device can be installed either internal or external to the indoor coil. In applications 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 field servicing
1/2 Turn
A
B
Remove the field−provided fitting that temporarily
reconnectedthe liquid line to the indoor unit’s distributor
assembly.
INDOOR EXPANSION VALVE INSTALLATION
TWO PIECE
12
PATCH PLATE
(Uncased Coil Shown)
1
11
10
®
(UNCASED
STUB
END
2
Install one of the provided Teflon rings around the
stubbed end of the check / expansion valve and lightly
lubricate the connector threads and expose surface of
LIQUID LINE
ORIFICE
COIL ONLY)
9
3
CHECK /
EXPANSION
VALVE
4
8
HOUSING
5
7
®
6
DISTRIBUTOR
TUBES
the Teflon ring with refrigerant oil.
®
TEFLON
RING
C
D
E
Attach the stubbed end of the expansion valve to the
liquid line orifice housing. Finger tighten and use an
appropriatelysized wrench to turn an additional 1/2 turn
clockwise as illustrated in the figure above, or 20 ft−lb.
®
®
Place the remaining Teflon washer around the other
end of the check / expansion valve. Lightly lubricate
TEFLON
RING
SENSING
LINE
®
connector threads and expose surface of the Teflon
ring with refrigerant oil.
DISTRIBUTOR
ASSEMBLY
EQUALIZER
LINE
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
illustratedin the figure above or 20 ft−lb.
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
SENSING BULB INSTALLATION
A
Attach the vapor line sensing bulb in the proper
orientationas illustrated to the right using the clamp and
screws provided.
1/8 Turn
MALE EQUALIZER LINE
FITTING (SEE
VAPOR
LINE
EQUALIZER LINE
INSTALLATION FOR
FURTHER DETAILS)
NOTE ꢀ Confirm proper thermal contact between vapor line
and expansion bulb before insulating the sensing bulb once
installed.
12
1
5
11
10
2
LIQUID LINE
9
3
4
8
B
Connect the equalizer line from the 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.
7
Sensing bulb insulation is
required if mounted external to
the coil casing.
6
ON LINES SMALLER THAN
7/8", MOUNT SENSING
BULB AT EITHER THE 3 OR
9 O’CLOCK POSITION.
VAPOR LINE
EQUALIZER LINE INSTALLATION
Remove and discard either the flare seal cap or flare nut with
copper flare seal bonnet from the equalizer line port on the vapor
line as illustrated in the figure to the right.
12
BULB
BULB
FLARE SEAL CAP
FLARE NUT
VAPOR LINE
ON 7/8" AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O’CLOCK
POSITION. NEVER MOUNT ON
BOTTOM OF LINE.
COPPER FLARE
SEAL BONNET
OR
12
MALE BRASS EQUALIZER
LINE FITTING
BULB
BULB
NOTE ꢀ NEVER MOUNT ON BOTTOM OF LINE.
VAPOR LINE
Figure 12. Installing Indoor Check / Expansion Valve
506728−01
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Leak Test Line Set and Indoor Coil
IMPORTANT
Leak detector must be capable of sensing HFC refrigerant.
CONNECT GAUGE SET
A
Connect an HFC−410A manifold gauge set high pressure hose to the
vapor valve service port.
LOW
HIGH
MANIFOLD GAUGE SET
NOTE ꢀ Normally, the high pressure hose is connected to the liquid
line port. However, connecting it to the vapor port better protects the
manifoldgauge set from high pressure damage.
B
With both manifold valves closed, connect the cylinder of HFC−410A
refrigerantto the center port of the manifold gauge set.
NOTE ꢀ Later in the procedure, the
HFC−410A container will be replaced by
the nitrogen container.
A
B
TO VAPOR
SERVICE VALVE
(ANGLE OR BALL
TYPE)
NITROGEN
OUTDOOR UNIT
HFC−410A
Figure 13. Manifold Gauge Set Connections for Leak Testing
TEST FOR LEAKS
side of the manifold gauge set. Disconnect the
HFC−410A cylinder.
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:
3. Connect a cylinder of dry nitrogen with a pressure
regulating valve to the center port of the manifold
gauge set.
1. 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).
4. Adjust dry nitrogen pressure to 150 psig (1034 kPa).
Open the valve on the high side of the manifold gauge
set in order to pressurize the line set and the indoor unit.
2. 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
5. 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.
6. After leak testing disconnect gauges from service
ports.
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Evacuating Line Set and Indoor Coil
Evacuating the system of non−condensables is critical for proper operation of the unit. Non−condensables are defined as any
gas that will not condense under temperatures and pressures present during operation of an air conditioning system.
Non−condensables and water suction combine with refrigerant to produce substances that corrode copper piping and
compressor parts.
CONNECT GAUGE SET
NOTE ꢀ Remove cores from service valves (if not already done).
LOW
HIGH
1
A
Connect low side of manifold gauge set
with 1/4 SAE in−line tee to vapor line
service valve
B
C
D
Connect high side of manifold gauge
set to liquid line service valve
MANIFOLD
GAUGE SET
A34000 1/4 SAE TEE WITH
SWIVEL COUPLER
Connect micron gauge available
connector on the 1/4 SAE in−line tee.
Connect the vacuum pump (with
vacuum gauge) to the center port of the
manifold gauge set. The center port
line will be used later for both the
HFC−410A and nitrogen containers.
A
500
TO VAPOR
SERVICE VALVE
MICRON
GAUGE
C
NITROGEN
OUTDOOR
UNIT
TO LIQUID LINE
SERVICE VALVE
HFC−410A
B
VACUUM PUMP
RECOMMEND
MINIMUM 3/8" HOSE
D
EVACUATE THE SYSTEM
A
B
Open both manifold valves and start the vacuum pump.
Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).
2
NOTE ꢀ During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure
indicates a relatively large leak. If this occurs, repeat the leak testing procedure.
NOTE ꢀ The term absolute pressure means the total actual pressure within a given volume or system, above the absolute zero of
pressure. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.
C
When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following:
S
S
S
S
S
S
Close manifold gauge valves
Close valve on vacuum pump and turn off vacuum pump
Disconnect manifold gauge center port hose from vacuum pump
Attach manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose.
Open manifold gauge valves to break the vacuum in the line set and indoor unit.
Close manifold gauge valves.
D
E
Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the
dry nitrogen from the line set and indoor unit.
Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the
absolutepressure does not rise above 500 microns (29.9 inches of mercury) within a 20−minute period after shutting off the vacuum pump
and closing the manifold gauge valves.
F
When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to an
upright cylinder of HFC−410A refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and
indoor unit.
1/6 TURN
G
Perform the following:
S
S
S
Close manifold gauge valves.
Shut off HFC−410A cylinder.
12
1
5
11
7
2
4
10
Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core
tool while maintaining a positive system pressure.
9
3
8
S
Replace stem caps and secure finger tight, then tighten an additional one−sixth (1/6) of a turn as illustrated.
6
Figure 14. Evacuating Line Set and Indoor Coil
506728−01
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Electrical
IMPORTANT
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).
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
capable of accurately measuring down to 50 microns.
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.
WARNING
Danger of Equipment Damage. Avoid deep vacuum
operation. Do not use compressors to evacuate a
system. Extremely low vacuums can cause internal
arcing and compressor failure. Damage caused by
deep vacuum operation will void warranty.
24VAC TRANSFORMER
Use the transformer provided with the furnace or air
handler for low-voltage control power (24VAC − 40 VA
minimum)
INSTALL THERMOSTAT
SIZE CIRCUIT AND INSTALL DISCONNECT
SWITCH
Install room thermostat (ordered separately) on an inside wall
2approximately 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.
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
THERMOSTAT
DISCONNECT
SWITCH
5 FEET
(1.5M)
NOTE ꢀ 24VAC, Class II circuit connections are made in the control
panel.
NOTE ꢀ Units are approved for use only with copper conductors.
Ground unit at disconnect switch or to an earth ground.
HIGH VOLTAGE FIELD WIRING
FACTORY WIRING
UNIT LOW VOLTAGE CONNECTIONS
3
LOW VOLTAGE (24V) FIELD WIRING
WIRE RUN LENGTH
AWG# INSULATION TYPE
LESS THAN 100’ (30 METERS)
MORE THAN 100’ (30 METERS)
18
16
TEMPERATURE RATING
35ºC MINIMUM.
ARun 24VAC control wires through cutout with grommet.
BRun 24VAC control wires through wire tie.
CMake 24VAC control wire connections defrost control terminal strip.
DTighten wire tie to security 24V control wiring.
C
TERMINAL STRIP
NOTE − FOR PROPER VOLTAGES, SELECT THERMOSTAT WIRE (CONTROL WIRES)
GAUGE PER TABLE ABOVE.
NOTE − WIRE TIE PROVIDES LOW VOLTAGE WIRE STRAIN RELIEF AND TO MAINTAIN
SEPARATION OF FIELD INSTALLED LOW AND HIGH VOLTAGE CIRCUITS.
NOTE − DO NOT BUNDLE ANY EXCESS 24VAC CONTROL WIRES INSIDE CONTROL
BOX.
A
D
B
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Figure 16. Typical Factory Wiring (Copeland Compressor)
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Figure 17. Typical Factory Wiring (Interlink Compressor)
506728−01
Page 22
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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.
Unit Start−Up
OPEN BOTH VAPOR AND LIQUID SERVICE
VALVE STEMS TO RELEASE
REFRIGERANT FROM OUTDOOR UNIT TO
SYSTEM.
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.
NO
YES
IMPORTANT
GO TO SERVICE AND WEIGH
GO TO OPTIMIZING SYSTEM
REFRIGERANT CHARGE ON
IN REFRIGERANT CHARGE
FOR OUTDOOR UNITS
DELIVERED VOID OF CHARGE
During installation, service or maintenance, make sure
that copper tubing does not rub against metal edges or
other copper tubing. Care should also be taken to ensure
that tubing does not become kinked. Use wire ties to se-
cure tubing to prevent movement.
Figure 18. Outdoor Unit Factory Charge
Do not secure electrical wires to tubing that carries hot
refrigerant gas. Heat from the tubing may melt the wiring
insulation causing a short circuit.
Service and Weigh In Refrigerant for
Outdoor Units Delivered Void of Charge
The following procedures are only required if it has been
determine that the new outdoor unit is void of charge. Skip
to the next section if refrigerant charge is present.
UNIT START−UP
1. Rotate fan to check for binding.
LEAK CHECK, REPAIR AND EVACUATE
If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.
2. Inspect all factory− and field−installed wiring for loose
connections.
3. Verify that the manifold gauge set is connected as
positioned near the liquid line service port as illustrated
subcooling method for optimizing the system
refrigerant charge.
1. Leak check system using procedures provided on
2. Evacuate the system using procedure provided in
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
4. Replace the stem caps and tighten to the value listed
in table 1.
4. Evacuate the system again using procedure in figure
14.
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.
CONNECT MANIFOLD GAUGE SET AND WEIGH−IN
CHARGE
After the evacuation procedure, reconnect the manifold
required for initial system weigh in charging.
6. Open both the liquid and vapor line service valves to
release the refrigerant charge contained in outdoor
unit into the system.
1. Close manifold gauge set valves and connect the
preparation.
2. Check that fan rotates freely.
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3. Inspect all factory− and field−installed wiring for loose
connections.
6. Monitor the system to determine the amount of
moisture remaining in the oil. It may be necessary to
replace the bi−flow filter drier several times to achieve
the required dryness level. If system dryness is not
verified, the compressor will fail in the future.
4. Open the high side manifold gauge valve and weigh in
liquid refrigerant. Use figure 20 to calculate the correct
weigh−in charge.
7. Continue to Optimizing System Refrigerant Charge
subcooling method.
5. Close manifold gauge valves.
MANIFOLD GAUGE SET
GAUGE SET
LOW
HIGH
CONNECTIONS FOR OPTIMIZING SYSTEM CHARGE
NOTE ꢀ Refrigerant
tank should be turned
right−side−up to deliver
vapor during charge
optimizingprocedure.
B
TRUE SUCTION PORT
CONNECTION
HFC−410A
REFRIGERANT
TANK
A
CHARGE IN
LIQUID PHASE
TEMPERATURE
SENSOR
(LIQUID LINE)
DIGITAL SCALE
TO LIQUID
LINE SERVICE
VALVE
C
D
A
Close manifold gauge set valves and connect the center hose to a cylinder of HFC−410A. Set
for liquid phase charging.
NOTE ꢀ For simplify the illustration,
the line set is not shown connected to
service valves.
B
C
D
Connect the manifold gauge set’s low pressure side to the true suction port.
Connect the manifold gauge set’s high pressure side to the liquid line service port.
Position temperature sensor on liquid line near liquid line service port (use only for subcooling
method).
Figure 19. Typical Gauge Set Connections for Initial Weight−in Charge or Optimizing System Charge
CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF CHARGE
If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the unit. To calculate the total refriger-
ant charge:
Additional charge specified per
match indoor air handler or coil
Adjust amount. for variation in line set
length listed on line set length table below.
Amount specified on
nameplate
Total Charge
+
=
+
Refrigerant Charge per Line Set Length
OUNCES PER
ADJUST FROM 15 FEET (4.6 METERS) LINE SET*
5
FEET (GRAMS PER 1.5 METERS)
LIQUID LINE SET DIAMETER
3/8" (9.5 MM)
3 OUNCE PER 5’ (85 GRAMS PER 1.5 M)
*If line length is greater than 15 feet (4.6 meters), add this amount. If line length
is less than 15 feet (4.6 meters), subtract this amount.
NOTE ꢀ Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the temperature
of the liquid line or when pressure drop is equal to or greater than 20 psig.
NOTE ꢀ The above nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for charge information.
Figure 20. Using HFC−410A Weigh In Method
506728−01
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DISTRIBUTOR
OUTDOOR UNIT
NOTE − ARROWS INDICATE DIRECTION
OF REFRIGERANT FLOW
REVERSING VALVE
CHECK / EXPANSION
VALVE
OUTDOOR
COIL
INDOOR UNIT
BI−FLOW FILTER / DRIER
MUFFLER
TRUE SUCTION
PORT
VAPOR
SERVICE
PORT
LIQUID LINE
SERVICE PORT
COMPRESSOR
CHECK / EXPANSION VALVE
INDOOR
COIL
NOTE − Use gauge ports on vapor line valve and liquid valve for evacuating refrigerant lines and
indoor coil. Use true suction port to measure vapor pressure during charging.
Figure 21. Heat Pump Cooling Cycle
efficiency. Make any air flow adjustments before
continuing with the optimizing procedure.
Optimizing System Refrigerant Charge
This section provides instructions on optimizing the
system charge. This section includes:
5. Use subcooling method to optimize the system
S
S
S
S
Optimizing procedure
Adjusting indoor airflow
Using subcooling method
ADJUSTING INDOOR AIRFLOW
Heating Mode Indoor Airflow Check
(Only use when indoor unit has electric heat)
Approved matched components, targeted subcooling
(SC) values and add charge values
S
S
Normal operating pressures
Temperature pressures
Indoor blower airflow (CFM) may be calculated by
energizing electric heat and measuring:
S
Temperature rise between the return air and supply air
temperatures at the indoor coil blower unit,
OPTIMIZING PROCEDURE
1. Move the low−side manifold gauge hose from the
vapor line service valve to the true suction port (see
S
S
Measuring voltage supplied to the unit,
Measuring amperage being drawn by the heat unit(s).
Then, apply the measurements taken in the following
formula to determine CFM:
2. Set the thermostat for either cooling or heating
demand. Turn on power to the indoor unit and close
the outdoor unit disconnect switch to start the unit.
Amps x Volts x 3.41
CFM =
1.08 x Temperature rise (F)
3. Allow unit to run for five minutes to allow pressures to
stabilize.
Cooling Mode Indoor Airflow Check
Check airflow using the Delta−T (DT) process using figure
22.
4. Check the airflow as instructed under Adjusting Indoor
Airflow to verify or adjust indoor airflow for maximum
Page 25
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DT
Temp.
of air
entering
indoor
coil ºF
1. Determine the desired DTꢀMeasure entering air temper-
ature using dry bulb (A) and wet bulb (B). DT is the intersect-
ing value of A and B in the table (see triangle).
80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
70 19 19 18 18 17 17 16 15 15 14 13 12 11 10
2. Find temperature drop across coilꢀMeasure the coil’s dry
bulb entering and leaving air temperatures (A and C). Tem-
A
perature Drop Formula: (T
) = A minus C.
Drop
Wet−bulb ºF
57 58 59 60 61 62 63 64 65 66 67 68 69 70
B
3. Determine if fan needs adjustmentꢀIf the difference between
the measured T and the desired DT (T –DT) is within
Drop
Drop
+3º, no adjustment is needed. See examples: Assume DT =
15 and A temp. = 72º, these C temperatures would necessi-
tate stated actions:
A
T
Drop
C
72º
19º
53º
Cº
T
–
DT
=
ºF ACTION
Drop
19
B
air flow
air flow
53º
58º
62º
–
–
–
15
15
15
=
=
=
4
Increase the airflow
DRY
BULB
64º
DRY
BULB
14
−1 (within +3º range) no change
10
−5 Decrease the airflow
WET
BULB
INDOOR
COIL
All temperatures are
expressed in ºF
4. Adjust the fan speedꢀSee indoor unit instructions to in-
crease/decrease fan speed.
Changing air flow affects all temperatures; recheck tempera-
tures to confirm that the temperature drop and DT are within
+3º.
Figure 22. Checking Airflow over Indoor Coil Using Delta−T Formula
1. Check liquid and vapor line pressures. Compare pressures with either second−stage heat or cooling mode normal
operating pressures listed in table 4. Table 4 is a general guide and expect minor pressures variations. Significant
pressure differences may indicate improper charge or other system problem.
2. Decide whether to use cooling or heating mode based on current outdoor ambient temperature:
AUse COOLING MODE when:
S
S
Outdoor ambient temperature is 60°F (15.5°C) and above.
Indoor return air temperature range is between 70 to 80°F (21−27°C). This temperature range is what
USE
COOLING
MODE
If indoor return air temperature is not within reference range, set thermostat to cooling mode and a setpoint of
68ºF (20ºC). This should place the outdoor unit into second−stage (high−capacity) cooling mode. When
60ºF
(15ºC)
BUse HEATING MODE when:
USE
HEATING
MODE
S
S
Outdoor ambient temperature is 59°F (15.0°C) and below.
Indoor return air temperature range is between 65−75°F (18−24°C). This temperature range is what the
If indoor return air temperature is not within reference range, set thermostat to heating mode and a setpoint of
77ºF (25ºC). This should place the outdoor unit into second−stage (high−capacity) heating mode. When
3. Read the liquid line pressure; then find its corresponding temperature pressure listed in table 3 and record it in
the SATº space to the left.
SATº
4. Read the liquid line temperature; record in the LIQº space to the left.
5. Subtract LIQº temperature from SATº temperature to determine subcooling; record it in SCº space to the left.
LIQº
SCº
–
6. CompareSCº results with table 5 (either Heating or Coolingmode column), also consider any additional charge
required for line set lengths longer than 15 feet and/or unit matched component combinations (Add Charge
column).
=
7. If subcooling value is:
AGREATER than shown for the applicable unit match component, REMOVE refrigerant;
BLESS than shown for the applicable unit match component, ADD refrigerant.
9. Close all manifold gauge set valves and disconnect gauge set from outdoor unit.
10. Replace the stem and service port caps and tighten as specified in Operating Service Valves on page .
11. Recheck voltage while the unit is running. Power must be within range shown on the nameplate.
Figure 23. Using HFC−410A Subcooling Method ꢀ Second Stage (High Capacity)
506728−01
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APPROVED MATCHED SYSTEM COMPONENTS, TARGETED SUBCOOLING (SC) VALUES AND
ADD CHARGE VALUES
Listed below are the approved matched system
components (air handlers and indoor coils), targeted
subcooling and add charge values for the XP14. This
information is also listed on the unit charging sticker
located on the outdoor unit access panel.
Subcooling values listed in the following tables are based
on outdoor ambient air temperature of:
S
S
60°F (15.5°C) and above for cooling mode
59°F (15.0°C) and below for heating mode.
Table 3. HFC−410A Temperature (°F) − Pressure (Psig)
°F
°C
Psig
°F
°C
Psig
−40
−35
−30
−25
−20
−15
−10
−5
−40.0
−37.2
−34.4
−31.7
−28.9
−26.1
−23.3
−20.6
−17.8
−15.0
−12.2
−9.4
11.6
14.9
18.5
22.5
26.9
31.7
36.8
42.5
48.6
55.2
62.3
70.0
78.3
87.3
96.8
107
60
65
15.6
18.3
21.1
23.9
26.7
29.4
32.2
35.0
37.8
40.6
43.3
46.1
48.9
51.7
54.4
57.2
60.0
62.8
65.6
170
185
201
217
235
254
274
295
317
340
365
391
418
446
476
507
539
573
608
70
75
80
85
90
95
0
100
105
110
115
120
125
130
135
140
145
150
5
10
15
20
25
30
35
40
45
50
55
−6.7
−3.9
−1.1
1.7
4.4
118
7.2
130
10.0
12.8
142
155
Table 4. Normal Operating Pressures − Liquid +10 and Vapor +5 PSIG
IMPORTANT
Use table 4 as a general guide when performing maintenance checks. This is not a procedure for charging the unit (Refer
to Charging / Checking Charge section). Minor variations in these pressures may be expected due to differences in instal-
lations. Significant differences could mean that the system is not properly charged or that a problem exists with some
component in the system.
Vapor Pressure
Model
Heating
Cooling
Number
ºF (ºC)*
−018
20
67
58
55
62
58
60
56
30
83
72
69
76
73
75
70
40
100
88
84
91
89
90
84
50
60
65
70
75
80
85
90
95
100
151
146
145
148
139
143
141
105
153
147
147
150
140
144
142
110
154
147
148
151
141
146
143
115
155
148
149
153
142
147
144
118
105
102
106
108
105
99
137
123
122
124
130
121
114
145
139
135
135
127
136
132
145
140
136
137
129
137
133
146
142
138
139
131
138
134
147
143
140
141
132
139
135
148
144
141
143
134
140
137
149
145
143
145
136
141
138
151
145
144
146
137
142
139
−024
−030
−036
−042
−048
−060
Liquid Pressure
ºF (ºC)*
−018
−024
−030
−036
−042
−048
20
30
40
50
60
65
70
75
80
85
90
95
100
406
399
400
385
371
369
105
433
426
426
412
398
395
110
462
454
452
441
426
422
115
498
483
480
471
455
450
272
281
274
287
293
282
287
295
286
304
335
299
305
309
299
322
368
316
321
324
313
342
394
334
339
340
327
365
411
353
242
243
250
230
215
219
259
262
268
248
234
237
279
281
288
268
254
256
302
302
308
288
275
277
326
325
330
311
298
298
351
348
352
334
321
321
376
373
376
359
346
344
−060
266
285
309
337
369
222
241
262
283
306
330
354
380
406
434
463
*Temperature of the air entering the outside coil.
Page 27
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Table 5. Indoor Unit Matches, Targeted Subcooling, and Add Charge Values
Subcool
Subcool
Subcool
Heat
OD
Size
Additional
Charge
OD
Size
Additional
Charge
OD
Size
Additional
Charge
Indoor Model #
Indoor Model #
Indoor Model #
Heat
Cool
14
14
14
14
13
5
Heat
Cool
9
Cool
8
7
5
5
6
8
8
11
7
10
6
6
6
8
6
8
8
6
8
6
6
6
7
6
6
6
7
6
7
6
7
5
6
5
8
6
5
7
4
6
6
6
7
7
CBX27UH−018
CBX27UH−024
CBX32MV−018/024
CH33−25A
13
13
12
14
14
12
15
14
17
12
14
12
14
12
11
11
11
10
20
19
15
10
20
17
15
15
26
13
19
10
10
15
10
15
10
10
10
11
11
16
16
10
6
1
1
0
0
0
0
1
1
0
1
0
1
0
1
2
2
2
0
1
1
1
0
1
0
0
0
0
1
1
2
2
2
2
2
2
2
2
0
0
2
2
0
0
1
2
9
9
CH33−43C
CR33−30, −36
CX34−31
4
1
1
2
0
2
0
2
2
0
0
0
0
0
0
0
0
0
0
0
2
2
2
2
2
2
0
1
0
2
0
3
2
0
2
2
2
2
2
1
3
1
0
1
1
3
12
0
CH33−60D
CH33−62D
12
19
29
29
11
25
8
0
1
0
0
1
1
1
3
1
3
0
1
0
1
0
1
4
0
1
2
1
0
3
1
1
1
3
3
3
3
0
1
0
1
2
0
1
0
0
2
2
1
2
3
9
7
22
17
25
14
25
13
9
5
0
15
6
10
10
10
10
14
12
4
CR33−50, −60
CR33−60D
4
7
CX34−36
4
−018
−030
CH33−25B
5
CX34−38
17
6
−042
CX34−49
4
CR33−30/36
CX34−25
7
CX34−42
CX34−50, −60
CX34−60
15
4
15
24
3
1
CX34−43
17
21
3
CX34−31
12
15
2
CX34−44, −48
CBX26UH−036
CBX27UH−036
CBX27UH−042
CBX27UH−048
CBX32M−036
CBX32M−042
CBX32MV−036
CBX32MV−048
CBX40UHV−042
CBX40UHV−048
CBX40UHV−036
CH33−43B
CX34−62C
8
10
15
11
0
CBX26UH−024
CBX27UH−024
CBX32M−018, −024
CBX32M−030
CBX32MV−018/024
CBX32MV−024/030
CBX32MV−036
CBX40UHV−024
CBX40UHV−030
CH23−41
31
18
11
11
18
18
18
11
11
11
18
14
26
24
26
15
15
38
15
40
23
40
11
23
42
13
13
13
13
13
20
7
CX34−62D
11
20
16
12
16
20
16
20
10
16
20
24
17
18
13
19
19
10
28
10
14
31
13
17
20
17
11
20
17
27
11
19
19
23
10
19
12
11
12
11
12
11
11
11
3
3
5
CBX26UH−048
CBX27UH−048
CBX27UH−060
CBX32M−048
CBX32M−060
CBX32MV−048
CBX32MV−060
CBX32MV−068
CBX40UHV−048
CBX40UHV−060
CH23−68
4
4
1
2
4
1
4
4
3
5
0
2
3
5
0
1
3
5
0
1
4
1
0
1
4
1
5
0
4
1
0
−024
CH33−25A
10
8
1
3
5
0
−048
CH33−25B
2
8
1
8
−036
CH33−31A
11
12
10
4
15
0
CH33−43C
9
10
3
CH33−50, −60C
CH33−60D
5
CH33−36C
CH33−44/48B
CH33−48C
8
13
6
CH33−36A
1
9
10
12
12
0
CH33−62D
CR33−30, −036
CX34−25
14
15
9
CH33−49C
8
CR33−50/60
CR33−60
1
9
CH33−50/60C
CR33−48
8
1
CX34−31
16
6
5
CX34−49C
9
CX34−36
9
CR33−50, −60
CX34−38
5
4
CX34−60
14
12
12
0
CX34−38
11
11
2
7
4
15
8
CX34−62C
CBX26UH−030
CBX27UH−030
CBX27UH−036
CBX32M−030
CBX32M−036
CBX32MV−024, −030
CBX32MV−036
CBX40UHV−030
CBX40UHV−036
CH23−41
5
CX34−43
8
CX34−62D
15
15
7
CX34−44/48
CX34−49
4
15
9
CBX26UH−060
CBX27UH−060
CBX32M−060
CBX32MV−048
CBX32MV−060
CBX32MV−068
CBX40UHV−048
CBX40UHV−060
CH23−68
2
7
8
4
CX34−50/60
CBX26UH−042
CBX27UH−042
CBX32M−048
CBX32MV−048
CBX40UHV−042
CBX40UHV−048
CH23−68
8
8
4
2
15
7
5
8
0
4
5
2
4
2
15
15
15
8
5
2
12
0
2
5
2
−030
2
5
2
−060
4
4
5
2
13
0
CH23−51
6
14
8
−042
9
5
CH33−50, −60C
CH33−62D
CH33−31A
18
18
6
CH33−43B
9
2
4
CH33−31B
6
CH33−43C
22
18
22
16
10
5
0
CR33−50/60
CR33−60
4
CH33−36A
6
CH33−44/48B
CH33−48C
4
0
3
CH33−36B
3
0
5
0
CX34−62C
14
2
CH33−36C
10
16
11
18
5
CH33−49C
6
6
CX34−62D
CH33−42B
6
CH33−50, −60C
9
4
*Amount of charge required in additional to charge shown on unit nameplate.
Low Pressure Switch (S87)
System Operation
This unit is equipped an auto−reset low pressure switch
which is located on the vapor line. The switch shuts off the
compressor when the vapor pressure falls below the
factory setting. Low Pressure (auto reset) − trip at 25 psig,
reset at 40 psig.
IMPORTANT
Low Pressure Switch Bypass (S41) (Optional)
For use in applications where the heat pump is operated in
outdoor ambient temperatures below 15°F.
Some scroll compressor have internal vacuum protector
that will unload scrolls when suction pressure goes
below 20 psig. A hissing sound will be heard when the
compressor is running unloaded. Protector will reset
when low pressure in system is raised above 40 psig. DO
NOT REPLACE COMPRESSOR.
S
S
Prevents nuisance trips form the low pressure switch
Wired in parallel with the low pressure switch
Thermal Protection Switch (S173) ꢀ Compressor
Mounted
Some units are equipped with a compressor mounted
normally closed temperature switch that prevents
compressor damage due to overheating caused by
internal friction. The switch is located on top of the
compressor casing (see figure 1). This switch senses the
compressor casing temperature and opens at 239−257°F
(115°C−125°C) to shut off compressor operation. The
High Pressure Switch (S4)
This unit is equipped with a auto-reset high pressure
switch (single−pole, single−throw) which is located on the
liquid line. The switch shuts off the compressor when
discharge pressure rises above the factory setting. High
Pressure (auto reset) − trip at 590 psig, reset at 418 psig.
506728−01
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auto−reset switch closes when the compressor casing
temperature falls to 151−187°F (66°C−86°C), and the
compressor is re−energized. This single−pole, single−throw
(SPST) bi−metallic switch is wired in series with the 24V Y
input signal to control compressor operation.
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.
Crankcase Thermostat (S40) (−036, −042, −048 and
−060 Units Only)
Defrost Control Timing Pins (P1)
Each timing pin selection provides
The reference models are equipped with a 70 watt, belly
band type crankcase heater. HR1 prevents liquid from
accumulating in the compressor. HR1 is controlled by a
thermostat located on the liquid line. When liquid line
temperature drops below 50° F the thermostat closes
energizing HR1. The thermostat will open, de−energizing
HR1 once liquid line temperature reaches 70° F .
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
maximum defrost period is 14 minutes and cannot be
adjusted.
Defrost Thermostat (S6)
NOTE ꢀ Defrost control part number is listed near the P1
timing pins.
The defrost thermostat is located on the liquid line between
the check/expansion valve and the distributor. When
defrost thermostat senses 42°F (5.5°C) or cooler, the
thermostat contacts close and send a signal to the defrost
control to start the defrost timing. It also terminates defrost
when the liquid line warms up to 70°F (21°C).
S
Units with defrost control 100269−02: Factory default
is 60 minutes
S
Units with defrost control 100269−04: Factory default
is 90 minutes
If the timing selector jumper is missing, the defrost
control defaults to a 90−minute defrost interval.
Bi−Flow Liquid Line Filter Drier
The unit is equipped with a large−capacity biflow filter drier
which keeps the system clean and dry. If replacement is
necessary, order another of the same design and capacity.
The replacement filter drier must be suitable for use with
HFC−410A refrigerant.
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.
S
Units with defrost control 100269−02: The compressor
will be cycled off for 30 seconds going in and out of the
defrost mode when the compressor delay jumper is
removed.
Defrost System
The XP14 defrost system includes two components: a
defrost thermostat (S6) and a defrost control (CMC1)
S
Units with defrost control 100269−04: The compressor
will be cycled off for 30 seconds going in and out of the
defrost mode when the compressor delay jumper is
installed.
DEFROST CONTROL (CMC1)
The defrost control includes the combined functions of a
time/temperature defrost control, defrost relay, diagnostic
LEDs and terminal strip for field wiring connections.
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.
P1 − FIELD SELECT
TIMING PINS
TEST
PINS
DIAGNOSTIC
LEDS
Test Mode (P1)
P5 −
COMPRESSOR
DELAY PINS
A TEST option is provided for troubleshooting. The TEST
mode may be started any time the unit is in the heating
mode and the defrost thermostat is closed or jumpered. If
the jumper is in the TEST position at power−up, the control
will ignore the test pins. When the jumper is placed across
the TEST pins for two seconds, the control will enter the
defrost mode. If the jumper is removed before an
additional 5−second period has elapsed (7 seconds total),
the unit will remain in defrost mode until the defrost
thermostat opens or 14 minutes have passed. If the jumper
is not removed until after the additional 5−second period
has elapsed, the defrost will terminate and the test option
will not function again until the jumper is removed and
re−applied.
REVERSING
VALVE
24V TERMINAL
STRIP
CONNECTIONS
S87
LOW PRESSURE
SWITCH
DEFROST
THERMOSTAT
S4
HIGH PRESSURE
SWITCH
Figure 24. Outdoor Unit Defrost Control (CMC1)
Page 29
XP14 SERIES
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Pressure Switch Circuit
6. Check amp−draw outdoor fan motor.
The defrost control incorporates two pressure switch
circuits. The high pressure switch (S4) is
factory-connected to the defrost control’s HI PS terminals
pressure, or loss-of-charge-pressure, switch (S87).
UNIT NAMEPLATE: _________ ACTUAL: __________
NOTE ꢀ If owner reports insufficient cooling, the unit
should be gauged and refrigerant charge checked.
Outdoor Coil
It may be necessary to flush the outdoor coil more
frequently if it is exposed to substances which are
corrosive or which block airflow across the coil (e.g., pet
urine, cottonwood seeds, fertilizers, fluids that may contain
high levels of corrosive chemicals such as salts)
During a single demand cycle, the defrost control will lock
out the unit after the fifth time that the circuit is interrupted
by any pressure switch wired to the defrost control. In
addition, the diagnostic LEDs will indicate a locked-out
pressure switch after the fifth occurrence of an open
locked out until power to the defrost control is interrupted,
then re-established or until the jumper is applied to the
TEST pins for 0.5 seconds.
S
Outdoor Coil ꢀ The outdoor coil may be flushed with
a water hose.
S
Outdoor Coil (Sea Coast) ꢀ Moist air in ocean
locations can carry salt, which is corrosive to most
metal. Units that are located near the ocean require
frequent inspections and maintenance. These
inspections will determine the necessary need to wash
the unit including the outdoor coil. Consult your
installing contractor for proper intervals/procedures
for your geographic area or service contract.
Defrost Control Diagnostic LEDs
The defrost control uses two LEDs for diagnostics. The
LEDs flash a specific sequence according to the condition.
Table 6. Defrost Control (CMC1) Diagnostic LED
Green LED
(DS2)
Mode
Red LED (DS1)
Indoor Unit
1. Clean or change filters.
No power to control
OFF
OFF
Normal operation / power Simultaneous Slow FLASH
to control
2. Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.
Anti-short cycle lockout
Alternating Slow FLASH
Low pressure switch fault OFF
Slow FLASH
ON
Low pressure switch
lockout
OFF
3. Check blower drive belt for wear and proper tension.
4. Check all wiring for loose connections
High pressure switch fault Slow FLASH
OFF
OFF
5. Check for correct voltage at unit (blower operating).
6. Check amp−draw on blower motor.
High pressure switch
lockout
ON
NOTE ꢀ The defrost control ignores input from the
low-pressure switch terminals as follows:
UNIT NAMEPLATE: _________ ACTUAL: __________
S
S
S
S
during the TEST mode,
Indoor Coil
1. Clean coil, if necessary.
during the defrost cycle,
during the 90-second start-up period,
2. Check connecting lines and coils for signs of oil leaks.
3. Check condensate line and clean, if necessary.
and for the first 90 seconds each time the reversing
valve switches heat/cool modes.
NOTE ꢀ The filter and all access panels must be in place
any time the unit is in operation.
Maintenance
HOMEOWNER
DEALER
Cleaning of the outdoor unit’s coil should be performed by
a trained service technician. Contact your dealer and set
up a schedule (preferably twice a year, but at least once a
year) to inspect and service your outdoor unit. The
following maintenance may be performed by the
homeowner.
Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each
cooling season, the system should be checked as follows:
Outdoor Unit
1. Clean and inspect the outdoor coil. The coil may be
flushed with a water hose. Ensure the power is turned
off before you clean the coil.
IMPORTANT
2. Outdoor fan motor is prelubricated and sealed. No
further lubrication is needed.
Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure of the
unit to treated water (i.e., sprinkler systems, soakers,
waste water, etc.) will corrode the surface of steel and
aluminum parts and diminish performance and longevity
of the unit.
3. Visually inspect connecting lines and coils for
evidence of oil leaks.
4. Check wiring for loose connections.
5. Check for correct voltage at the unit (with the unit
operating).
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Outdoor Coil
S
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 furnace which deliver lower volumes of
considerably hotter air to heat the space.
The outdoor unit must be properly maintained to ensure its
proper operation.
S
S
S
Please contact your dealer to schedule proper
inspection and maintenance for your equipment.
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). The heat pump control activates a
defrost cycle lasting 5 to 15 minutes at preset intervals
to clear the outdoor coil of the frost.
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.
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
defrost cycle to satisfy a heating demand; however,
the unit will return to normal operation at the
conclusion of the defrost cycle.
S
Keep shrubbery trimmed away from the unit and
periodically check for debris which collects around the
unit.
Routine Maintenance
In order to ensure peak performance, your system must be
properly maintained. Clogged filters and blocked airflow
prevent your unit from operating at its most efficient level.
Extended Power Outage
The heat pump is equipped with a compressor crankcase
heater which protects the compressor from refrigerant
slugging during cold weather operation.
1. Air Filter ꢀ Ask your Lennox dealer to show you
where your indoor unit’s filter is located. It will be either
at the indoor unit (installed internal or external to the
cabinet) or behind a return air grille in the wall or
ceiling. Check the filter monthly and clean or replace
it as needed.
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.
2. Disposable Filter ꢀ Disposable filters should be
replaced with a filter of the same type and size.
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.
NOTE ꢀ If you are unsure about the filter required for your
system, call your Lennox dealer for assistance.
3. Reusable Filter ꢀ Many indoor units are equipped
with reusable foam filters. Clean foam filters with a
mild soap and water solution; rinse thoroughly; allow
filter to dry completely before returning it to the unit or
grille.
Preservice Check
If your system fails to operate, check the following before
calling for service:
S
S
S
S
S
S
Verify room thermostat settings are correct.
Verify that all electrical disconnect switches are ON.
Check for any blown fuses or tripped circuit breakers.
Verify unit access panels are in place.
NOTE ꢀ The filter and all access panels must be in place
any time the unit is in operation.
4. Indoor Unit ꢀ The indoor unit’s evaporator coil is
equipped with a drain pan to collect condensate
formed as your system removes humidity from the
inside air. Have your dealer show you the location of
the drain line and how to check for obstructions. (This
would also apply to an auxiliary drain, if installed.)
Verify air filter is clean.
If service is needed, locate and write down the unit
model number and have it handy before calling.
Accessories
Thermostat Operation
For update−to−date information, see any of the following
publications:
See the thermostat homeowner manual for instructions on
how to operate your thermostat.
S
S
S
Lennox XP14 Engineering Handbook
Lennox Product Catalog
Heat Pump Operation
Your new Lennox heat pump has several characteristics
that you should be aware of:
Lennox Price Book
Page 31
XP14 SERIES
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Start−Up and Performance Checklist
Job Name
Job Location
Installer
Job no.
City
Date
State
City
State
Unit Model No.
Serial No.
Service Technician
Nameplate Voltage
Rated Load Ampacity
Compressor Amperage:
Maximum Fuse or Circuit Breaker
Electrical Connections Tight?
Indoor Blower RPM
-
Indoor Filter clean?
-
Supply Voltage (Unit Off)
S.P. Drop Over Indoor (Dry)
Outdoor Coil Entering Air Temp.
Vapor Pressure;
Refrigerant Lines: Leak Checked? - Properly Insulated?
-
-
Outdoor Fan Checked?
Voltage With Compressor Operating
THERMOSTAT
-
Service Valves:
Fully Opened? - Caps Tight?
SEQUENCE OF OPERATION
Calibrated?
-
Properly Set? - Level?
-
Heating Correct?
-
Cooling Correct?
-
506728−01
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