Lennox XP14 User manual

03/10 505,244M
*2P0310* *P505244M*
Page 1
2010 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause personal injury,
loss of life, or damage to property.
Installation and service must be performed by a
qualified installer or service agency.
CAUTION
Physical contact with metal edges and corners
while applying excessive force or rapid motion can
result in personal injury. Be aware of, and use
caution when working near these areas during
installation or while servicing this equipment.
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.
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.
INSTALLATION
INSTRUCTIONS
XP14 Elite®Series Units
HEAT PUMP UNITS
505,244M
03/10
Supersedes 10/09
Table of Contents
XP14 Outdoor Unit 1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions and Parts Arrangement 2. . . . . . . . .
General Information 3. . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Unit 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing Panels 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Piping 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flushing Existing Line Set and Indoor Coil 10. . . . . . . .
Refrigerant Metering Device 11. . . . . . . . . . . . . . . . . . . .
Manifold Gauge Set 12. . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Valves 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leak Testing 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evacuation 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start−Up 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Charge 14. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Indoor Airflow before Charging 14. . . . . . . . . . . .
Setup for Checking and Adding Charge 15. . . . . . . . . .
Weigh in Charge 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Subcooling Charge 15. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defrost System 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User Information 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start-up and Performance Checklist 26. . . . . . . . . . . . . .
XP14 Outdoor Unit
The XP14 outdoor unit uses HFC−410A HFC refrigerant.
This unit must be installed with a matching indoor blower
coil and line set as outlined in the Lennox Engineering
Handbook. Elite®Series XP14 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 expansion valve approved for use with
HFC−410A must be ordered separately and installed prior
to operating the unit.
Shipping and Packing List
1 − Assembled XP14 outdoor unit
Check the unit components for shipping damage. If you
find any damage, immediately contact the last carrier.
Litho U.S.A.

Page 2
505244M 10/09
Unit Dimensions − Inches (mm) and Parts Arrangement
RUN
CAPACITOR
DEFROST
BOARD
CONTACTOR
REVERSING
VALVE
FILTER DRIER/
LIQUID LINE
CONNECTIONS
OUTDOOR FAN
COMPRESSOR
HIGH PRESSURE
SWITCH
VAPOR LINE
VAPOR VALVE AND
GAUGE PORT/SUCTION
LINE CONNECTIONS
PARTS ARRANGEMENT
ELECTRICAL
INLETS
SIDE VIEW
DISCHARGE AIR
VAPOR LINE
CONNECTION
LIQUID LINE
CONNECTION
4−1/4(
108)
4−3/4
(121)
1 (25)
2 (51)
SIDE VIEW
C
B
A
UNIT SUPPORT
FEET
8−1/2
(216) 16−7/8
(429)
30−3/4
(781)
26−7/8
(683)
3−3/4
(95)
8−3/4
(222)
3−1/8
(79)
XP14−018 TO −030 BASE SECTION
8−3/4
(222)
5−1/2
(140)
9−1/2
(241)
8−1/4
(210)
13−1/2
(343)
UNIT SUPPORT
FEET
XP14−036 TO −060 BASE WITH
ELONGATED LEGS
4−5/8
(117)
SUCTION LINE
CONNECTION
LIQUID LINE
CONNECTION
TOP VIEW
Model No. ABC
XP14−018 31 (787) 27 (686) 28 (711)
XP14−024 31 (787) 27 (686) 28 (711)
XP14−030 35 (889) 27 (686) 28 (711)
XP14−036 31 (787) 35 1/2 (902) 39 1/2 (1003)
XP14−042 39 (991) 35 1/2 (902) 39 1/2 (1003)
XP14−048 39 (991) 35 1/2 (902) 39 1/2 (1003)
XP14−060 45 (1143) 35 1/2 (902) 39 1/2 (1003)

Page 3
XP14 SERIES
WARNING
Product contains fiberglass wool.
Disturbing the insulation of this product during
installation, maintenance, or repair will expose you
to fiberglass wool. Breathing this may cause lung
cancer. (Fiberglass wool is know to the State of
California to cause cancer.) Fiberglass wool may
also cause respiratory, skin and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address show below, or contact your
supervisor.
Lennox Industries Inc., PO Box 79011, Dallas, TX
75379−9011
General Information
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 shows
torque values for fasteners.
Table 1. Torque Requirements
Part Recommended Torque
Service valve cap 8 ft.− lb. 11 NM
Sheet metal screws 16 in.− lb. 2 NM
Machine screws #8 16 in.− lb. 2 NM
Compressor bolts 90 in.− lb. 10 NM
Gauge port seal cap 8 ft.− lb. 11 NM
Setting the Unit
CAUTION
In order to avoid injury, take proper precaution when
lifting heavy objects.
Outdoor units operate under a wide range of weather
conditions; therefore, several factors must be considered
when positioning the outdoor unit.
Position the unit to allow adequate airflow and servicing
clearance. Maintain a minimum clearance of 24 inches
(610 mm) between multiple units as illustrated in figure 1
for installation clearances.
1. Place a sound-absorbing material, such as Isomode,
under the unit if it will be installed in a location or
position that will transmit sound or vibration to the
living area or adjacent buildings.
2. Install the unit high enough above ground or roof to
allow adequate drainage of defrost water and prevent
ice build-up.
3. In heavy snow areas, do not locate unit the where
snowdrifts will likely build. The unit base should be
elevated above the depth of average snows.
NOTE - Elevation of the unit may be accomplished by
constructing a frame using suitable materials. If a
support frame is constructed, it must not block drain
holes in unit base.
4. Locate the unit so prevailing winter winds will not blow
into the coil.
5. Locate unit away from overhanging roof lines which
would allow water or ice to drop on, or in front of, coil
or into unit.
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See
NOTES
See NOTES
See
NOTES
See NOTES Control
Box
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. (305
mm) 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. Installation Clearances
SLAB MOUNTING
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 away from the building of 2
degrees or 2 inches per 5 feet (50 mm per 1500 mm) to
prevent ice build-up under the unit during a defrost cycle.
NOTE − If necessary for stability, anchor unit to slab as
described in Stabilizing Unit on Uneven Surfaces on page
4.
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.
MOUNTING
SLAB
BUILDING
STRUCTURE
GROUND LEVEL
Figure 2. Slab Mounting Options

Page 4
505244M 10/09
ELEVATING THE UNIT (SMALL−BASE UNITS)
If additional elevation is necessary, raise the unit by
extending the length of the unit support feet. This may be
done by cutting four equal true−cut lengths of Schedule
(SCH) 40, 4" (101.6mm) piping to the height required as
illustrated in figure 3.
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.
The inside diameter of the 4" (101.6mm) piping is
approximately 0.25" (6.35mm) greater than the
pre−installed feet on the unit. Devise a shim that will take up
the space and hold the extenders onto the feet during this
procedure. Small strips of 0.125" (3.175mm) thick
adhesive foam may be used. One or two small 1"
(25.4mm) square strips should be adequate to hold the
extender in place.
Leg Detail
Base
4" (101.6mm)
SCH 40 Piping
Figure 3. Elevated Slab Mounting using Feet
Extenders (Small Base Units)
ELEVATING THE UNIT (LARGER−BASE UNITS)
Unlike the small−base units which use round feet, the
larger−base units are outfitted with elongated feet as
illustrated in figure 4. which uses a similar method for
elevating the unit height.
If additional elevation is necessary, raise the unit by
extending the length of the unit support feet. This may be
done with 2" SCH 40 female threaded adapter. The
specified coupling will fit snuggly into the recess portion of
the feet. Use additional 2" SCH 40 male threaded adaptors
which can be threaded into the female threaded adaptors
to make additional adjustments to the level of the unit.
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.
Leg Detail
Base
2" (50.8mm)
SCH 40
Female Threaded
Adapter
Figure 4. Elevated Slab Mounting using Feet
Extenders (Larger Base Units)
STABILIZING UNIT ON UNEVEN SURFACES
To help stabilize an outdoor unit, some installations may
require strapping the unit to the pad using brackets and
anchors commonly available in the marketplace.
TYPICAL
INSTALLATION
WITH 3 TO 4 IN.
EXTENDERS
INSTALLED
IMPORTANT!
ALWAYS USE
STABILIZER
BRACKET ON
ELEVATED
INSTALLATIONS
STABILIZER
BRACKETS
MOUNTING
SLAB
BUILDING
STRUCTURE
GROUND LEVEL
Figure 5. Elevated Slab Mounting using Feet
Extenders
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 factory height units
when mounted on unstable or uneven surface.

Page 5
XP14 SERIES
With unit positioned at installation site, remove two side
louvered panels to expose the unit base pan. Install the
brackets as illustrated in figure 6 using conventional
practices; replace the panels after installation is complete.
ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY,
2 BRACKETS PER SIDE, 2" FROM EACH CORNER.
PLASTIC ANCHOR − USE IF CONCRETE
(HOLE DRILL 1/4"); NOT IF PLASTIC SLAB
(HOLE DRILL 1/8").
COIL
BASE PAN
CORNER POST
STABILIZING BRACKET
(18 GAUGE METAL − 2"
WIDTH; HEIGHT AS
REQ’D)
#10 1/2" LONG
SELF−DRILLING SHEET
METAL SCREWS
#10 1−1/4" LONG HEX
HD SCREW &
FLATWASHER
MINIMUM 1
PER SIDE
FOR EXTRA
STABILITY
Deck Top
Mounting
STABILIZING
BRACKET (18
GAUGE METAL − 2"
WIDTH; HEIGHT
AS REQ’D); BEND
TO FORM RIGHT
ANGLE
Figure 6. Installing Stabilizer Brackets
(Slab Side Mounting)
ROOF MOUNTING
Install unit 6" (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 rooftop applications.
If unit cannot be located away from prevailing winter winds,
construct a wind barrier sized at least the same height and
width as outdoor unit. Position barrier 24" (610 mm) from
the sides of the unit in direction of prevailing winds as
illustrated in figure 7.
wind barrier
prevailing winter winds
24"
(610 mm)
inlet air
inlet air
inlet air
inlet air
Figure 7. Rooftop Application with Wind Barrier
Removing Panels
Remove the louvered panels as follows:
1. Remove two screws, allowing the panel to swing open
slightly as illustrated in figure 8.
2. Hold the panel firmly throughout this procedure.
Rotate bottom corner of panel away from hinge corner
post until lower three tabs clear the slots as illustrated
figure 8, Detail B .
3. Move panel down until lip of upper tab clears the top
slot in corner post as illustrated in figure 8, Detail A.
Position and Install PanelPosition the panel almost
parallel with the unit as illustrated in figure 9, Detail D on
page 6 with the screw side as close to the unit as possible.
Then, in a continuous motion:
slightly rotate and guide the lip of top tab inward as
illustrated in figure 8, Details A and C; then upward into
the top slot of the hinge corner post.
rotate panel to vertical to fully engage all tabs.
holding the panel’s hinged side firmly in place, close
the right−hand side of the panel, aligning the screw
holes.
When panel is correctly positioned and aligned, insert the
screws and tighten.
Detail
A
Detail C
Detail
B
ROTATE IN THIS DIRECTION;
THEN DOWN TO REMOVE PANEL
SCREW
HOLES
LIP
IMPORTANT! Do not allow panels to hang on unit by top tab. Tab
is for alignment and not designed to support weight of panel.
Panel shown slightly rotated to allow top tab to exit (or enter) top
slot for removing (or installing) panel.
Figure 8. Removing/Installing Louvered Panels
(Details A, B and C)

Page 6
505244M 10/09
MAINTAIN MINIMUM PANEL ANGLE (AS CLOSE TO PARALLEL WITH THE UNIT
AS POSSIBLE) WHILE INSTALLING PANEL.
PREFERRED ANGLE
FOR INSTALLATION
Detail D
ANGLE MAY BE TOO
EXTREME
HOLD DOOR FIRMLY TO THE HINGED
SIDE TO MAINTAIN
FULLY−ENGAGED TABS
Figure 9. Removing/Installing Louvered Panels
(Detail D)
CAUTION
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.
Electrical
In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).
Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
1. Install line voltage power supply to unit from a properly
sized unit disconnect switch.
2. Ground the unit at the unit disconnect switch or to
earth ground.
3. To facilitate conduit, a hole is provided in the bottom of
the control box. Connect conduit to the control box
using a proper conduit fitting.
4. Units are approved for use only with copper
conductors. (A complete unit wiring diagram is
located inside the unit control box cover.)
WARNING! − ELECTRIC SHOCK HAZARD. Can cause INJU-
RY 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 10. Outdoor Unit Typical Field Wiring
NOTE − For proper voltages, select thermostat wire
gauge per the following chart:
Table 2. Wire Run Lengths
Wire run length AWG # Insulation type
less than 100’ (30m) 18 color−coded, temperature
rating 35ºC minimum
more than 100’ (30m) 16
5. Install room thermostat (ordered separately) on an
inside wall approximately in the center of the
conditioned area and 5 feet (1.5 m) from the floor. It
should not be installed on an outside wall or where it
can be affected by sunlight, drafts or vibrations.
6. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit. See figures 11 and
12 on page 7.
NOTE − 24V, Class II circuit connections are made in the
low voltage junction box.)
WARNING
Electric Shock Hazard. Can cause
injury or death. Unit must be
grounded in accordance with national
and local codes.
Line voltage is present at all
components when unit is not in
operation on units with single-pole
contactors. Disconnect all remote
electric power supplies before
opening access panel. Unit may have
multiple power supplies.

Page 7
XP14 SERIES
Thermostat Indoor Unit Outdoor Unit
R
C
W1
Y1
O
G
R
C
W1
W2
W3
G
R
C
W1
Y1
O
common
1st-stage
auxiliary heat
indoor blower
compressor
24V power
reversing valve
common
1st-stage
auxiliary heat
24V power
(SOME CONNECTIONS MAY NOT APPLY. REFER TO SPECIFIC
THERMOSTAT AND INDOOR UNIT.)
Figure 11. Outdoor Unit and Blower Unit Thermostat
Designations
R
C
W1
Y1
O
G
R
C
W1
W2
W3
G
E
R
C
W1
Y1
O
emergency heat
EMERGENCY
HEAT RELAY
OUTDOOR
THERMOSTAT
Thermostat Indoor Unit Outdoor Unit
common
1st-stage
auxiliary heat
indoor blower
compressor
common
1st-stage
auxiliary heat
24V power 24V power
(SOME CONNECTIONS MAY NOT APPLY. REFER TO SPECIFIC
THERMOSTAT AND INDOOR UNIT.)
reversing valve
Figure 12. Outdoor Unit and Blower Unit Thermostat
Designations (with Emergency Heat Relay)
Figure 13. Typical XP14 Wiring

Page 8
505244M 10/09
Refrigerant Piping
IMPORTANT
The Clean Air Act of 1990 bans the intentional
venting of refrigerant (CFC’s, HFC’s, and HCFC’s)
as of July 1, 1992. Approved methods of recovery,
recycling or reclaiming must be followed. Fines
and/or incarceration may be levied for
noncompliance.
If the XP14 unit is being installed with a new indoor coil and
line set, the plumbing connections should be made as
outlined in this section. If an existing line set and/or indoor
coil is going to be used to complete the XP14 system, refer
to the following section that includes flushing procedures.
Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit (sweat connections) to the indoor coil
(flare or sweat connections). Use Lennox L15 (sweat,
non-flare) series line sets as shown in table 3 or use
field-fabricated refrigerant lines. Refer to Refrigerant
Piping Guide (Corp. 9351−L9) for proper size, type, and
application of field−fabricated lines. Valve sizes are also
listed in table 3.
REFRIGERANT LINE CONNECTIONS − XP14
OUTDOOR UNIT MATCHED WITH NEW INDOOR
COIL AND LINE SET
If replacing an existing coil equipped with a liquid line
functioning as a metering orifice, replace the liquid line
prior to installing the XP14 unit. Line sets are described in
table 3.
Table 3. Refrigerant Line Sets
Model
Valve Field
Connections Recommended Line Set
Liquid
Line
Vapor
Line
Liquid
Line
Vapor
Line
L15
Line Sets
−018
−024
−030
3/8 in.
(10 mm)
3/4 in
(19 mm)
3/8 in.
(10
mm)
3/4 in
(19 mm)
L15−41
15 ft. − 50 ft.
(4.6 m − 15 m)
−036
−042
−048
3/8 in.
(10 mm)
7/8 in
(22 mm)
3/8 in.
(10
mm)
7/8 in
(22 mm)
L15−65
15 ft. − 50 ft.
(4.6 m − 15 m)
−060 3/8 in.
(10 mm)
1−1/8 in.
(29 mm)
3/8 in.
(10
mm)
1−1/8 in.
(29 mm)
Field
Fabricated
NOTE − When installing refrigerant lines, refer to Lennox
Refrigerant Piping Guide (Corp. 9351−L9) or Lennox
Technical Support Department Product Applications
Group for assistance. In addition, be sure to consider the
following points:
Select line set diameters from table 3 to ensure that oil
returns to the compressor.
Units are designed for line sets of up to 50 feet (15 m);
for longer line sets, consult piping guidelines.
Size vertical vapor riser to maintain minimum velocity
at minimum capacity.
INSTALLING REFRIGERANT LINE
Pay close attention to line set isolation during installation of
any heat pump or a/c system. When properly isolated from
building structures (walls, ceilings. floors), the refrigerant
lines will not create unnecessary vibration and subsequent
noises. Also, consider the following when placing and
installing a high−efficiency outdoor unit:
1. PlacementSome localities are adopting sound
ordinances based on the unit’s noise level observed
from the adjacent property, not from the installation
property. Install the unit as far as possible from the
property line. When possible, do not install the unit
directly outside a window. Glass has a very high level
of sound transmission. Figure 14 shows how to place
the outdoor unit and line set.
Install unit
away from
windows
Two 90° elbows installed in line set
will reduce line set vibration.
Figure 14. Outside Unit Placement
2. Line Set IsolationThe following illustrations
demonstrate procedures which ensure proper
refrigerant line set isolation.
Figure 15 on page 9 shows how to install line sets
on horizontal runs.
Figure 16 on page 9 shows how to install line sets
on vertical runs.
Figure 17 on page 9 shows how to make a
transition from horizontal to vertical

Page 9
XP14 SERIES
METAL
SLEEVE
STRAPPING MATERIAL
(AROUND SUCTION
LINE ONLY)
TAPE OR
WIRE TIE
WIRE TIE
(AROUND
SUCTION LINE
ONLY)
FLOOR JOIST OR
ROOF RAFTER
TAPE OR
WIRE TIE
TO HANG LINE SET FROM JOIST OR
RAFTER, USE EITHER METAL STRAPPING
MATERIAL OR ANCHORED HEAVY NYLON
WIRE TIES.
8 FEET
8 FEET
STRAP THE SUCTION LINE TO
THE JOIST OR RAFTER AT 8 FEET
INTERVALS THEN STRAP THE
LIQUID LINE TO THE SUCTION
LINE.
FLOOR JOIST OR
ROOF RAFTER
Figure 15. Refrigerant Line Sets: Installing
Horizontal Runs
NOTE − SIMILAR INSTALLATION
PRACTICES SHOULD BE USED
IF LINE SET IS TO BE INSTALLED
ON EXTERIOR OF OUTSIDE
WALL.
PVC
PIPE
FIBERGLASS
INSULATION
CAULK
OUTSIDE
WALL
SUCTION LINE WRAPPED
WITH ARMAFLEX
LIQUID LINE
IMPORTANT! REFRIGERANT
LINES MUST NOT CONTACT
STRUCTURE.
OUTSIDE WALL LIQUID LINE
SUCTION LINE
IMPORTANT - REFRIGERANT LINES MUST NOT CONTACT WALL.
WOOD BLOCK
BETWEEN STUDS
STRAP
SLEEVE
WOOD BLOCK
STRAP
SLEEVE
WIRE TIE
WIRE TIE
WIRE TIE
INSIDE WALL
Figure 16. Refrigerant Line Sets: Installing Vertical
Runs (New Construction Shown)
STRAP LIQUID LINE TO
SUCTION LINE
METAL SLEEVE
AUTOMOTIVE
MUFFLER-TYPE HANGER
WALL
STUD
SUCTION LINE − WRAPPED IN
ARMAFLEX
LIQUID LINE
ANCHORED HEAVY
NYLON WIRE TIE
STRAP LIQUID LINE
TO SUCTION LINE
WALL
STUD
LIQUID LINE
METAL SLEEVE
SUCTION LINE − WRAPPED IN
ARMAFLEX
Figure 17. Refrigerant Line Sets: Transition from
Vertical to Horizontal
BRAZING CONNECTION PROCEDURE
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.
1. Cut ends of the refrigerant lines square (free from
nicks or dents). Debur the ends. The pipe must remain
round; do not pinch end of the line.
2. Flow dry nitrogen through the refrigerant piping while
making line set connections; this prevents carbon
deposits (oxidation) buildup on the inside of the joints
being brazed. Such buildup may restrict refrigerant
flow through screens and metering devices. To do this:
Flow regulated nitrogen (at 1 to 2 psig) through the
refrigeration gauge set into the Schrader port
connection on the vapor service valve and out of
the Schrader port connection on the liquid service
valve. (Metering device (CTXV and RFC) will
allow low pressure nitrogen to flow through the
system.)

Page 10
505244M 10/09
While nitrogen is flowing, braze refrigerant line set
to the indoor and outdoor units. IMPORTANT: The
flow of nitrogen must have an escape path
other than through the joint to be brazed.
3. Use silver alloy brazing rods (5 or 6 percent minimum
silver alloy for copper−to−copper brazing or 45 percent
silver alloy for copper−to−brass or copper−to−steel
brazing) which are rated for use with HFC−410A
refrigerant.
4. Wrap a wet cloth around the valve body and the copper
tube stub to protect it from heat damage during
brazing. Wrap another wet cloth underneath the valve
body to protect the base paint.
NOTE − The tube end must stay bottomed in the fitting
during final assembly to ensure proper seating,
sealing and rigidity.
5. Install a field−provided check expansion valve
(approved for use with HFC−410A refrigerant) in the
liquid line at the indoor coil.
Flushing Existing Line Set and Indoor
Coil
IMPORTANT
If this unit is being matched with an approved line
set or indoor coil which was previously charged
with HCFC−22 refrigerant, 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 check
expansion valve, reducing system performance
and capacity.
Failure to properly flush the system per the
instructions below will void the warranty.
WARNING
Danger of fire. Bleeding the
refrigerant charge from only the high
side may result in the low side shell
and suction tubing being
pressurized. Application of a brazing
torch while pressurized may result in
ignition of the refrigerant and oil
mixture − check the high and low
pressures before unbrazing.
CAUTION
This procedure should not be performed on
systems which contain contaminants (Example:
compressor burn out).
IMPORTANT
The line set and indoor 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.
EQUIPMENT REQUIRED FOR FLUSHING LINE SET
The following equipment is required to flush the existing
line set and indoor coil:
two clean HCFC−22 recovery cylinders
oilless recovery machine with a pump down feature
gauge set for HCFC−22 refrigerant
gauge set for HFC−410A refrigerant (see Manifold
Gauge Set section on page 12).
FLUSHING PROCEDURE
1. Remove existing HCFC−22 refrigerant using the
following, applicable procedure as illustrated in figure
18:
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
refrigerant to flush the system −
Disconnect all power to the existing outdoor unit.
Connect to the existing unit, a clean recovery
cylinder and the recovery machine according to
the instructions provided with the recovery
machine.
Remove all HCFC−22 refrigerant from the existing
system. Check gauges after shutdown to confirm
that the entire system is completely void of
refrigerant.
Disconnect the liquid and vapor lines from the
existing outdoor unit.
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 −
Start the existing HCFC−22 system in the cooling
mode and close the liquid line valve.
Pump all of the existing HCFC−22 refrigerant back
into the outdoor unit. (It may be necessary to
bypass the low pressure switches to ensure
complete refrigerant evacuation.)
When the low side system pressures reach 0 psig,
close the vapor line valve.
Disconnect all power to the existing outdoor unit.
Check gauges after shutdown to confirm that the
valves are not allowing refrigerant to flow back into
the low side of the system.
Disconnect the liquid and vapor lines from the
existing outdoor unit.
2. Remove the existing outdoor unit. Set the new
HFC−410A unit and follow the Brazing Connection
Procedure provided on page 9 to make line set
connections. DO NOT install HFC−410A
check/expansion valve at this time.
3. Make low voltage and line voltage connections to the
new outdoor unit. DO NOT turn on power to the unit
or open the outdoor unit service valves at this
time.

Page 11
XP14 SERIES
LOW HIGH
EXISTING
INDOOR
UNIT
GAUGE
MANIFOLD
INVERTED HCFC−22
CYLINDER CONTAINS
CLEAN HCFC−22 TO BE
USED FOR FLUSHING.
LIQUID LINE SERVICE VALVE
INLET
DISCHARGE
TANK
RETURN
CLOSED
OPENED
RECOVERY
CYLINDER
NOTE − The inverted HCFC−22 cylinder must contain at least the same
amount of refrigerant as was recovered from the existing system.
RECOVERY MACHINE
NEW
OUTDOOR
UNIT
SUCTION LINE
SERVICE VALVE
SUCTION
LIQUID
A
B
C
D
AInverted HCFC−22 cylinder with clean refrigerant to the
suction service valve.
BHCFC−22 gauge set (low side) to the liquid line valve.
CHCFC−22 gauge set center port to inlet on the recovery
machine. with an empty recovery tank to the gauge set.
DConnect recovery tank to recovery machines per machine
instructions.
Figure 18. Flushing Connections
4. Remove the existing HCFC−22 refrigerant flow control
orifice or check expansion valve before continuing with
flushing procedures. HCFC−22 flow control devices
(fixed orifice/check expansion valve) are not approved
for use with HFC−410A refrigerant and may prevent
proper flushing. Use a field−provided fitting to
reconnect the lines.
5. Remove the pressure tap valve cores from the XP14
unit’s service valves. Connect an HCFC−22 cylinder
with clean refrigerant to the vapor service valve.
Connect the HCFC−22 gauge set to the liquid line valve
and connect a recovery machine with an empty
recovery tank to the gauge set.
6. 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 coil.
7. 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 coil before it enters the recovery machine.
8. 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 a vacuum on the system.
NOTE − A single system flush should remove all of the
mineral oil from the existing refrigerant lines and
indoor coil. A second flushing may be done (using
clean refrigerant) if insufficient amounts of mineral oil
were removed during the first flush. After each
system flush, allow the recovery machine to pull a
vacuum on the system at the end of the
procedure.
9. 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.
10. Use dry nitrogen to break the vacuum on the
refrigerant lines and indoor coil before removing the
recovery machine, gauges and HCFC−22 refrigerant
drum. Reinstall pressure tap valve cores into XP14
unit’s service valves.
11. Install check expansion valve (approved for use with
HFC−410A refrigerant) in the liquid line at the indoor
coil.
Refrigerant Metering Device
XP14 units may be used in check thermal expansion valve
(CTXV) systems only. See indoor coil installation
instructions and the Lennox engineering handbook for
approved HFC−410A valve match−ups and application
information.
NOTE − HFC−410A systems will not operate properly with
an HCFC−22 valve.
Check thermal expansion valves equipped with fittings are
available from Lennox. Refer to the Engineering
Handbook for applicable expansion valves for use with
specific match-ups.
NOTE − If necessary, remove
HCFC−22 flow control device
(fixed orifice/check expansion
valve) from existing line set before
installing HFC−410A approved ex-
pansion valve and o−ring.
Remove and discard
SEAL ASSEMBLY
(if applicable)
TWO PIECE
PATCH PLATE
(uncased coil
only)
SUCTION
LINE
ORIFICE
HOUSING
DISTRIBUTOR
TUBES
LIQUID
LINE
SENSING BULB
(insulation required)
ACCESS FITTING
(no valve core)
SENSING
LINE
EQUALIZER
LINE
EXPANSION VALVE
(see note)
O−RING
STRAINER
(Uncased Coil Shown)
On smaller lines,
bulb may be
mounted on top
1/2" & smaller
suction line
12
3
9
Do not mount bulb
on bottom of line
5/8" & larger
suction line
Suction
Line
Bulb
O−RING
Figure 19. Metering Device Installation

Page 12
505244M 10/09
NOTE − Use gauge ports on vapor line valve and liquid valve for evacuating refrigerant
lines and indoor coil. Use vapor gauge port to measure vapor pressure during charging.
OUTDOOR
COIL
CHECK
EXPANSION VALVE
BIFLOW
FILTER /
DRIER
TO
HFC−410
A DRUM
LOW
PRESSURE
COMPRESSOR
REVERSING VALVE
VAPOR
LINE
VALVE
MUFFLER
NOTE − ARROWS INDICATE
DIRECTION OF REFRIGERANT FLOW
SERVICE
PORT
VAPOR
CHECK EXPANSION VALVE
INDOOR UNIT
OUTDOOR UNIT
LIQUID
LINE
SERVICE
PORT
GAUGE MANIFOLD
DISTRIBUTOR
INDOOR
COIL
VAPOR
SERVICE
PORT
HUGH
PRESSURE
Figure 20. XP14 Cooling Cycle (Showing Gauge Manifold Connections)
IMPORTANT
Failure to remove a fixed orifice when installing an
expansion valve on the indoor coil will result in
improper operation and damage to the system.
If you install a check thermal expansion valve with an
indoor coil that includes a fixed orifice, remove the orifice
before the check expansion valve is installed. See figure
19 for installation of the check expansion valve.
Manifold Gauge Set
Manifold gauge sets used with systems charged with
HFC−410A refrigerant must be capable of handling the
higher system operating pressures. The gauges should be
rated for use with pressures of 0 − 800 on the high side and
a low side of 30" vacuum to 250 psi with dampened speed
to 500 psi. Gauge hoses must be rated for use at up to 800
psi of pressure with a 4000 psi burst rating.
Service Valves
The service valves and gauge ports are used for leak
testing, evacuating, charging and checking charge. Each
valve is equipped with a service port which has a
factory−installed Schrader valve. A service port cap
protects the Schrader valve from contamination and
serves as the primary leak seal.
To Access Schrader Port:
1. Remove service port cap with an adjustable wrench.
2. Connect gauge to the service port.
3. When testing is completed, replace service port cap.
Tighten finger tight, then torque per table 1 on page 3.
To Open Front-Seated Service Valves:
1. Remove stem cap with an adjustable wrench.
2. Use a service wrench with a hex−head extension
(3/16" for liquid-line valve sizes; 5/16" for vapor-line
valve sizes) to back the stem out counterclockwise as
far as it will go.
3. Replace the stem cap. Tighten finger tight, then torque
per table 1 on page 3.
To Close Front-Seated Service Valves:
1. Remove the stem cap with an adjustable wrench.
2. Use a service wrench with a hex−head extension
(3/16" for liquid-line valve sizes; 5/16" for vapor-line
valve sizes) to turn the stem clockwise to seat the
valve. Tighten it firmly.
3. Replace the stem cap. Tighten finger tight, then torque
per table 1 on page 3.
INSERT HEX
WRENCH HERE
SERVICE
PORT CAP
STEM
CAP
(VALVE FRONT-SEATED)
TO
OUT-
DOOR
COIL
SCHRADER
VALVE [OPEN TO
LINE SET WHEN
VALVE IS CLOSED
(FRONT SEATED)]
TO
INDOOR
COIL
Valve in closed position Valve in open position
Figure 21. Front-Seated Liquid Line Valve
Vapor Line Ball Valve
Ball-type service valves as illustrated in figure 22 function
the same way as the other valves but cannot be rebuilt; if
one fails, replace with a new valve. The ball valve is
equipped with a service port with a factory−installed
Schrader valve. A service port cap protects the Schrader
valve from contamination and assures a leak−free seal.

Page 13
XP14 SERIES
SERVICE PORT
BALL (SHOWN
CLOSED)
STEM
CAP
SCHRADER VALVE
SERVICE
PORT CAP
TO
INDOO
R COIL
TO
OUTDOOR
COIL
STEM
USE ADJUSTABLE WRENCH
TO OPEN: ROTATE STEM
COUNTER-CLOCKWISE 90°.
TO CLOSE: ROTATE STEM
CLOCKWISE 90°.
Figure 22. Ball−Type Vapor Valve (Valve Closed)
Leak Testing
After the line set has been connected to the indoor and
outdoor units, check the line set connections and indoor
unit for leaks.
WARNING
Refrigerant can be harmful if it is inhaled. Refriger-
ant must be used and recovered responsibly.
WARNING
Fire, Explosion and Personal Safety
Hazard.
Failure to follow this warning could
result in damage, personal injury or
death.
Never use oxygen to pressurize or
purge refrigeration lines. Oxygen,
when exposed to a spark or open
flame, can cause damage by fire and/
or an explosion, that could result in
personal injury or death.
WARNING
Danger of explosion!
When using a high pressure gas such
as dry nitrogen to pressurize a refrig-
eration or air conditioning system,
use a regulator that can control the
pressure down to 1 or 2 psig (6.9 to
13.8 kPa).
USING AN ELECTRONIC LEAK DETECTOR
IMPORTANT
Leak detector must be capable of sensing HFC re-
frigerant.
1. Connect a cylinder of HFC−410A to the center port of
the manifold gauge set.
2. With both manifold valves closed, connect the cylinder
of HFC−410A refrigerant. Open the valve on the
HFC−410A cylinder (vapor only).
3. 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 2 ounces (57 g) refrigerant or 3 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 HFC−410A cylinder.
4. Connect a cylinder of dry nitrogen with a pressure
regulating valve to the center port of the manifold
gauge set.
5. Connect the manifold gauge set high pressure hose to
the vapor valve service port. (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.)
6. 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.
7. After a few minutes, open a refrigerant port to ensure
the refrigerant you added is adequate to be detected.
(Amounts of refrigerant will vary with line lengths.)
Check all joints for leaks. Purge dry nitrogen and
HFC−410A mixture. Correct any leaks and recheck.
Evacuation
Evacuating the system of noncondensables is critical for
proper operation of the unit. Noncondensables are defined
as any gas that will not condense under temperatures and
pressures present during operation of an air conditioning
system. Noncondensables and water vapor combine with
refrigerant to produce substances that corrode copper
piping and compressor parts.
IMPORTANT
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
that reads from 50 microns to at least 23,000 microns.
1. Connect manifold gauge set to the service valve ports
as follows:
low pressure gauge to vapor line service valve
high pressure gauge to liquid line service valve
2. Connect micron gauge.
3. Connect the vacuum pump (with vacuum gauge) to
the center port of the manifold gauge set.
4. Open both manifold valves; start the vacuum pump.
5. Evacuate the line set and indoor unit to an absolute
pressure of 23,000 microns (29.01 inches of
mercury). During the early stages of evacuation, it is
desirable to close the manifold gauge valve at least
once to determine if there is a rapid rise in absolute
pressure. A rapid rise in pressure indicates a
relatively large leak. If this occurs, repeat the leak
testing procedure.

Page 14
505244M 10/09
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.
6. When the absolute pressure reaches 23,000 microns
(29.01 inches of mercury), close the manifold gauge
valves, turn off the vacuum pump and disconnect the
manifold gauge center port hose from vacuum pump.
Attach the manifold center port hose to a dry nitrogen
cylinder with pressure regulator set to 150 psig (1034
kPa) and purge the hose. Open the manifold gauge
valves to break the vacuum in the line set and indoor
unit. Close the manifold gauge valves.
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.
7. 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.
8. 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.
9. 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
valves to break the vacuum from 1 to 2 psig positive
pressure in the line set and indoor unit. Close manifold
gauge valves and shut off the HFC−410A cylinder and
remove the manifold gauge set.
Start−Up
IMPORTANT
If unit is equipped with crankcase heater, it should
be energized 24 hours before unit start−up to pre-
vent compressor damage as a result of slugging.
1. Rotate fan to check for frozen bearings or binding.
2. Inspect all factory− and field-installed wiring for loose
connections.
NOTE − After the system has been evacuated and before
completing all the remaining start−up steps, this is the ideal
time to adjust the amount of refrigerant made necessary by
line set length difference and by the specific indoor unit
match−up. Skip to the paragraph Setup for Checking and
Adding Charge" on page 15 to setup for charging and for
determining if charge is needed; adjust the charge
accordingly.
3. Open the liquid line and vapor line service valves
(counterclockwise) to release refrigerant charge
(contained in outdoor unit) into the system.
4. Replace stem caps and secure finger tight, then
tighten an additional (1/6) one-sixth of a turn.
5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit
nameplate. If not, do not start the equipment until the
power company has been consulted and the voltage
condition has been corrected.
6. Set the thermostat for a cooling demand. Turn on
power to indoor blower unit and close the outdoor unit
disconnect to start the unit.
7. Recheck voltage while the unit is running. Power must
be within range shown on the nameplate.
IMPORTANT
Mineral oils are not compatible with HFC−410A. If
oil must be added, it must be a polyol ester oil.
Refrigerant Charge
This system is charged with HFC−410A refrigerant which
operates at much higher pressures than HCFC−22. The
recommended check expansion valve is approved for use
with HFC−410A. Do not replace it with a valve that is
designed to be used with HCFC−22. This unit is NOT
approved for use with coils that include metering orifices or
capillary tubes.
Units are factory-charged with the amount of HFC−410A
refrigerant indicated on the unit rating plate. This charge is
based on a matching indoor coil and outdoor coil with 15 ft.
(4.6 m) line set. For varying lengths of line set, refer to table
3 for refrigerant charge adjustment. A blank space is
provided on the unit rating plate to list the actual field
charge.
Check Indoor Airflow before Charging
IMPORTANT
Check airflow before charging!
NOTE − Be sure that filters and indoor and outdoor coils are
clean before testing.
COOLING MODE INDOOR AIRFLOW CHECK
Check airflow using the Delta−T (DT) process (figure 23).
HEATING MODE INDOOR AIRFLOW CHECK
Blower airflow (CFM) may be calculated by energizing
electric heat and measuring:
temperature rise between the return air and supply air
temperatures at the indoor coil blower unit,
voltage supplied to the unit,
amperage being drawn by the heat unit(s).
Then, apply the measurements taken in following formula
to determine CFM:
CFM =
Amps x Volts x 3.41
1.08 x Temperature rise (F)
Check indoor airflow using the step procedures as
illustrated in figure 23.

Page 15
XP14 SERIES
Step 1. Determine the desired DTMeasure entering air tempera-
ture using dry bulb (A) and wet bulb (B). DTis the intersecting value of
Aand B in the table (see triangle).
Step 2. Find temperature drop across coilMeasure the coil’s dry
bulb entering and leaving air temperatures (Aand C). Temperature
Drop Formula: (TDrop) = Aminus C.
Step 3. Determine if fan needs adjustmentIf the difference be-
tween the measured TDrop and the desired DT(TDrop–DT) is within
+3º, no adjustment is needed. See examples: Assume DT= 15 and A
temp. = 72º, these C temperatures would necessitate stated actions:
Cº TDrop –DT=ºF ACTION
53º 19 – 15 =4Increase the airflow
58º 14 – 15 =−1 (within +3º range) no change
62º 10 – 15 =−5 Decrease the airflow
Step 4. Adjust the fan speedSee indoor unit instructions to in-
crease/decrease fan speed.
Changing air flow affects all temperatures; recheck temperatures to
confirm that the temperature drop and DT are within +3º.
DT
80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
70 19 19 18 18 17 17 16 15 15 14 13 12 11 10
57 58 59 60 61 62 63 64 65 66 67 68 69 70
Temp.
of air
entering
indoor
coil ºF
INDOOR
COIL
DRY
BULB
DRY
BULB
WET
BULB
B
TDrop
19º
A
Dry−bulb
Wet−bulb ºF
A
72º
B
64º
C
53º
air flowair flow
All temperatures are
expressed in ºF
Figure 23. Checking Indoor Airflow over Evaporator Coil using Delta−T Chart
Setup for Checking and Adding Charge
SETUP FOR CHARGING
Connect the manifold gauge set to the unit’s service ports
(see figure 20):
low pressure gauge to vapor service port
high pressure gauge to liquid service port
Close manifold gauge set valves. Connect the center
manifold hose to an upright cylinder of HFC−410A.
CALCULATING CHARGE
If the system is void of refrigerant, first, locate and repair
any leaks and then weigh in the refrigerant charge into the
unit. To calculate the total refrigerant charge:
Amount
specified
on
nameplate
Adjust amt. for
variation in
line set length
(table 4)
Additional charge
specified per
indoor unit match−up
(table 5)
Total
charge
+ + =
Weigh in Charge
1. Recover the refrigerant from the unit.
2. Conduct leak check; evacuate as previously outlined.
3. Weigh in the unit nameplate charge plus any charge
required for line set differences from 15 feet and any
extra indoor unit match−up amount per table 5. (If
weighing facilities are not available, use the
subcooling method.)
Table 4. Charge per Line Set Lengths
Liquid Line
Set Diameter
Oz. per 5 ft. (g per 1.5m) adjust from
15 ft. (4.6m) line set*
3/8 in. (9.5mm) 3 ounce per 5 ft. (85g per 1.5m)
NOTE − *If line length is greater than 15 ft. (4.6 m), add this amount. If
line length is less than 15 ft. (4.6 m), subtract this amount.
Subcooling Charge
Requirementsthese items are required for charging:
Manifold gauge set connected to unit.
Thermometers for measuring outdoor ambient, liquid
line, and vapor line temperatures.
When to use cooling modeWhen outdoor
temperature is 60°F (15°C) and above, use cooling mode
to adjust charge.
When to use heating modeWhen the outdoor
temperature is below 60°F (15°C), use the heating mode to
adjust the charge.
Adding Charge for Indoor Match−UpTable 5 lists all
the Lennox recommended indoor unit matches along with
the charge levels for the various sizes of outdoor units.

Page 16
505244M 10/09
Table 5. Adding Charge per Indoor Unit Match using Subcooling Method
Use
cooling
mode
Use
heating
mode
1 Check the airflow as illustrated in figure 23 on page 15 to be sure the indoor airflow is as required.
(Make any air flow adjustments before continuing with the following procedure.)
2 Measure outdoor ambient temperature; determine whether to use cooling mode or heating mode
to check charge.
3 Connect gauge set.
4 Check Liquid and Vapor line pressures. Compare pressures with Normal Operating Pressures table
7, (Table 7 is a general guide. Expect minor pressure variations. Significant differences may mean
improper charge or other system problem.)
5 Set thermostat for heat/cool demand, depending on mode being used:
Using cooling modeWhen the outdoor ambient temperature is 60°F (15°C) and above. Target
subcooling values in table below are based on 70 to 80°F (21−27°C) indoor return air temperature; if
necessary, operate heating to reach that temperature range; then set thermostat to cooling mode
setpoint to 68ºF (20ºC). When pressures have stabilized, continue with step 6.
Using heating modeWhen the outdoor ambient temperature is below 60°F (15°C). Target
subcooling values in table below are based on 65−75°F (18−24°C) indoor return air temperature; if
necessary, operate cooling to reach that temperature range; then set thermostat to heating mode
setpoint to 77ºF (25ºC). When pressures have stabilized, continue with step 6.
6 Read the liquid line temperature; record in the LIQº space.
7 Read the liquid line pressure; then find its corresponding temperature in the temperature/ pressure
chart listed on page 18 and record it in the SATº space.
8 Subtract LIQº temp. from SATº temp. to determine subcooling; record it in SCº space.
9 Compare SCº results with table below, being sure to note any additional charge for line set and/or
match−up.
10 If subcooling value is greater than shown in table, remove refrigerant; if less than shown, add
refrigerant.
11 If refrigerant is added or removed, repeat steps 5 through 10 to verify charge.
60ºF (15ºC)
SATº
LIQº –
SCº =

Page 17
XP14 SERIES
Table 6. Air Handler/Coil Matchups and Target Subcooling
INDOOR MATCHUPS
Target
Subcooling
HeatingCooling
(+5ºF)(+1ºF)
*Add
charge INDOOR MATCHUPS
Target
Subcooling
HeatingCooling
(+5ºF)(+1ºF)
*Add
charge INDOOR MATCHUPS
Target
Subcooling
HeatingCooling
(+5ºF)(+1ºF)
*Add
charge
XP14−018 lb oz XP14−030 (Continued) lb oz XP14−042 (Continued) lb oz
CBX27UH−018/024 13 7 0 8 CH33−42B 6 6 1 12 CR33−50/60C,−60D 26 6 0 4
CBX32MV−018/024 15 7 0 0 CR33−30/36A/B/C 30 8 0 8 CX34−62C, −62D 12 6 0 9
CBX40UHV−024 15 7 0 0 CX34−31A/B 11 6 1 6 CX34−49C 12 6 0 7
XP14−024 lb oz CX34−38A/B S/N# 6007 and
after 6 6 2 3 CX34−60D 12 6 0 4
CBX26UH−024 25 7 0 0 CX34−38A/B Before S/N#
6007 11 6 23XP14−048 lb oz
CBX27UH−018/024 15 8 1 2 CX34−43B/C 15 11 2 14 CBX26UH−048 8 7 1 9
CBX32M−018/024 16 8 0 14 XP14−036 lb oz CBX27UH−048 11 8 1 2
CBX32M−030 15 8 1 3 C33−44C 13 6 0 0 CBX32M−048, −060 11 8 1 2
CBX32MV−018/024 16 8 0 14 CBX26UH−036 26 5 0 0 CBX32MV−048 25 8 0 0
CBX32MV−024/030 15 8 1 2 CBX26UH−037 25 4 1 9 CBX32MV−060 11 8 1 2
CBX40UHV−024 16 8 0 14 CBX27UH−036 13 6 0 3 CBX40UHV−048 25 8 0 0
CBX40UHV−030 15 8 1 2 CBX32M−036 13 6 0 2 CBX40UHV−060 11 8 1 2
CH23−41 16 8 0 2 CBX32M−042 13 6 0 3 CBX32MV−068 10 7 1 12
CH33−25A 16 6 0 7 CBX32MV−036 13 6 0 3 CH23−68 20 9 2 9
CH33−42B 14 11 1 10 CBX32MV−048 11 8 2 5 CH33−50/60C 11 8 1 1
CH33−36A 16 8 1 0 CBX40UHV−036 13 6 0 3 CH33−62D 10 7 1 14
CH33−36C 16 8 0 4 CBX40UHV−042, −048 11 8 2 5 CH33−60D 11 8 0 0
CR33−30/36A/B/C 25 7 0 2 CH33−50/60C 11 8 2 5 CR33−50/60C 35 5 0 0
CX34−25A/B 16 8 0 14 CH33−44B 13 6 1 7 CR33−60D 37 6 0 0
CX34−31A/B 15 8 1 3 CH33−48B 13 6 1 8 CX34−62C, −62D 10 7 1 7
CX34−36A/B/C 16 8 1 8 CR33−50/60C 25 4 1 15 CX34−49D 11 8 0 14
CX34−38A/B S/N# 6007 and
after 11 11 2 2 CR33−48B/C 25 5 0 9 CX34−60D 11 8 0 0
CX34−38A/B before S/N#
6007 14 11 2 2 CX34−49C 13 6 2 4 XP14−060 lb oz
XP14−030 lb oz CX34−43B/C, −50/60C 13 6 1 8 CBX26UH−048 12 7 1 0
CH23−41 11 6 08CX34−38A/B S/N# 6007 and
after 6 6 0 0 CBX26UH−060 14 4 0 0
CH23−51 6 6 1 12 CX34−38A/B before S/N#
6007 13 6 0 0 CBX27UH−060 12 5 0 0
CBX26UH−024 30 8 0 6 XP14−042 lb oz CBX32M−048, −060 12 5 0 0
CBX26UH−030 29 8 2 3 CH23−68 20 9 0 13 CBX32MV−048, −060 12 5 0 0
CBX27UH−030 11 6 2 4 CBX26UH−042 27 6 0 0 CBX40UHV−048, −060 12 5 0 0
CBX32M−030 11 6 1 6 CBX27UH−042 12 6 0 8 CBX32MV−068 12 7 1 0
CBX32M−036 11 6 2 4 CBX32M−048 12 6 0 7 CH23−68 12 5 0 0
CBX32MV−024/030 11 6 1 6 CBX32MV−048 12 6 0 8 CH33−50/60C 12 5 0 0
CBX32MV−036 15 7 3 0 CBX40UHV−042, −048 12 6 0 8 CH33−62D 12 5 0 0
CBX40UHV−024, −030 11 6 1 6 CH33−43 12 6 0 7 CX34−62C, −62D 12 7 1 0
CBX40UHV−036 15 7 3 0 CH33−62D 12 6 0 10 *Add charge = Extra matchup amount required in addition to
charge indicated on Heat Pump nameplate (remember to also
add any charge required for line set differences from 15 feet).
SN indicates serial number.
C33−44C 11 6 2 3 CH33−50/60C 12 6 0 7
CH33−36C 11 3 0 0 CH33−60D 12 6 0 4

Page 18
505244M 10/09
Table 7. Normal Operating Pressures − Liquid +10 and Vapor +5 PSIG* (Cooling)
5F
(
5C
)
**
XP14−018 XP14−024 XP14−030 XP14−036 XP14−042 XP14−048 XP14−060
Liquid / Vapor Liquid / Vapor Liquid / Vapor Liquid/ Vapor Liquid / Vapor Liquid / Vapor Liquid / Vapor
Heating
60 (15) 346 / 139 352 / 138 338 / 137 350 / 134 373 / 139 355 / 130 351 / 117
50 (10) 323 / 117 331 / 114 334 / 112 331 / 117 363 / 117 336 / 113 333 / 105
40 (4) 306 / 98 304 / 99 312 / 93 313 / 97 348 / 97 315 / 88 316 / 88
30 (−1) 278 / 84 299 / 80 302 / 74 298 / 83 336 / 74 296 / 72 308 / 70
20 (−7) 273 / 66 283 / 66 280 / 53 284 / 66 322 / 64 286 / 64 300 / 61
Cooling
65 (18) 226 / 140 233 / 137 238 / 138 220 / 138 223 / 125 231 / 136 243 / 136
70 (21) 244 / 141 252 / 138 263 / 139 236 / 140 241 / 130 248 / 139 263 / 137
75 (24) 263 / 142 271 / 140 279 / 139 256 / 141 261 / 134 271 / 140 282 / 138
80 (27) 283 / 143 292 / 141 299 / 140 276 / 142 282 / 138 291 / 142 306 / 139
85 (29) 302 / 144 314 / 142 324 / 141 298 / 143 302 / 139 312 / 143 327 / 140
90 (32) 328 / 145 338 / 143 340 / 142 321 / 144 326 / 140 335 / 144 351 / 141
95 (35) 351 / 146 361 / 145 375 / 145 344 / 144 349 / 141 359 / 145 376 / 142
100 (38) 376 / 147 387 / 146 397 / 145 369 / 146 374 / 142 384 / 146 401 / 143
105 (41) 402 / 148 412 / 147 424 / 147 394 / 147 399 / 143 411 / 148 426 / 145
110 (38) 430 / 149 441 / 148 454 / 150 421 / 148 428 / 145 439 / 149 452 / 146
115 (45) 465 / 150 471 / 151 485 / 150 449 / 149 455 / 146 468 / 150 484 / 148
*IMPORTANTThese are most popular match−up pressures. Indoor match up, indoor air quality, and indoor load cause pressures to vary.
**Temperature of the air entering the outside coil.
Table 8. HFC−410A Temp. (°F) − Pressure (Psig)
°F Psig °F Psig °F Psig °F Psig
32 100.8 63 178.5 94 290.8 125 445.9
33 102.9 64 181.6 95 295.1 126 451.8
34 105.0 65 184.3 96 299.4 127 457.6
35 107.1 66 187.7 97 303.8 128 463.5
36 109.2 67 190.9 98 308.2 129 469.5
37 111.4 68 194.1 99 312.7 130 475.6
38 113.6 69 197.3 100 317.2 131 481.6
39 115.8 70 200.6 101 321.8 132 487.8
40 118.0 71 203.9 102 326.4 133 494.0
41 120.3 72 207.2 103 331.0 134 500.2
42 122.6 73 210.6 104 335.7 135 506.5
43 125.0 74 214.0 105 340.5 136 512.9
44 127.3 75 217.4 106 345.3 137 519.3
45 129.7 76 220.9 107 350.1 138 525.8
46 132.2 77 224.4 108 355.0 139 532.4
47 134.6 78 228.0 109 360.0 140 539.0
48 137.1 79 231.6 110 365.0 141 545.6
49 139.6 80 235.3 111 370.0 142 552.3
50 142.2 81 239.0 112 375.1 143 559.1
51 144.8 82 242.7 113 380.2 144 565.9
52 147.4 83 246.5 114 385.4 145 572.8
53 150.1 84 250.3 115 390.7 146 579.8
54 152.8 85 254.1 116 396.0 147 586.8
55 155.5 86 258.0 117 401.3 148 593.8
56 158.2 87 262.0 118 406.7 149 601.0
57 161.0 88 266.0 119 412.2 150 608.1
58 163.9 89 270.0 120 417.7 151 615.4
59 166.7 90 274.1 121 423.2 152 622.7
60 169.6 91 278.2 122 428.8 153 630.1
61 172.6 92 282.3 123 434.5 154 637.5
62 175.4 93 286.5 124 440.2 155 645.0

Page 19
XP14 SERIES
Defrost System
DEFROST SYSTEM DESCRIPTION
The demand defrost controller measures differential
temperatures to detect when the system is performing
poorly because of ice build−up on the outdoor coil. The
controller self−calibrates when the defrost system starts
and after each system defrost cycle. The defrost control
board components are shown in figure 24.
The control monitors ambient temperature, outdoor coil
temperature, and total run time to determine when a
defrost cycle is required. The coil temperature probe is
designed with a spring clip to allow mounting to the outside
coil tubing. The location of the coil sensor is important for
proper defrost operation.
NOTE − The demand defrost board accurately measures
the performance of the system as frost accumulates on the
outdoor coil. This typically will translate into longer running
time between defrost cycles as more frost accumulates on
the outdoor coil before the board initiates defrost cycles.
SERVICE LIGHT OPERATION
The thermostat is not included with the unit and must be
purchased separately. Some outdoor thermostats
incorporate isolating contacts and an emergency heat
function (which includes an amber indicating light). The
service light thermostat will enable the emergency heat
light function on the room thermostat.
EMERGENCY HEAT (AMBER LIGHT)
An emergency heat function is designed into some room
thermostats. This feature is applicable when isolation of
the outdoor unit is required, or when auxiliary electric heat
is staged by outdoor thermostats. When the room
thermostat is placed in the emergency heat position, the
outdoor unit control circuit is isolated from power and
field-provided relays bypass the outdoor thermostats. An
amber indicating light simultaneously comes on to remind
the homeowner that he is operating in the emergency heat
mode.
Emergency heat is usually used during an outdoor unit
shutdown, but it should also be used following a power
outage if power has been off for over an hour and the
outdoor temperature is below 50°F (10°C). System should
be left in the emergency heat mode at least six hours to
allow the crankcase heater sufficient time to prevent
compressor slugging.
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.
DEFROST CONTROL BOARD
Figure 24 provides a basic illustration of the layout of the
defrost control board. Table 9 provides information
concerning pin−out and jumper configurations.
24V TERMINAL
STRIP
CONNECTIONS
DIAGNOSTIC
LEDS
PRESSURE
SWITCH
CIRCUIT
CONNECTIONS
TEST PINS
Note − Component Locations Vary by Board Manufacturer.
SENSOR PLUG IN
(COIL, AMBIENT,
& DISCHARGE
SENSORS)
Figure 24. Defrost Control Board
REVERSING
VALVE
DELAY
PINS
LOW
AMBIENT
THERMOSTAT
PINS
DEFROST
TERMINATION
PIN SETTINGS
Test: Defrost Temperature Termination Shunt
(Jumper) PinsThe defrost board selections are: 50, 70,
90, and 100°F (10, 21, 32 and 38°C). The shunt
termination pin is factory set at 50°F (10°C). If the
temperature shunt is not installed, the default termination
temperature is 90°F (32°C).
Note: The Y1 input must be active (ON) and the O" room
thermostat terminal into board must be inactive.
DIAGNOSTIC LEDS
The state (Off, On, Flashing) of two LEDs on the defrost
board (DS1 [Red] and DS2 [Green]) indicate diagnostics
conditions that are described in table 10.
DELAY MODE
The defrost board has a field−selectable function to reduce
occasional sounds that may occur while the unit is cycling
in and out of the defrost mode. When a jumper is installed
on the DELAY pins, the compressor will be cycled off for 30
seconds going in and out of the defrost mode. Units are
shipped with jumper installed on DELAY pins.
DEFROST BOARD PRESSURE SWITCH
CONNECTIONS
The unit’s automatic reset pressure switches (LO PS − S87
and HI PS − S4) are factory−wired into the defrost board on
the LO−PS and HI−PS terminals, respectively.
Low Pressure Switch (LO−PS)
When the low pressure switch trips, the defrost board will
cycle off the compressor, and the strike counter in the
board will count one strike. The low pressure switch is
ignored under the following conditions:
during the defrost cycle and 90 seconds after the
termination of defrost
when the average ambient sensor temperature is below
15° F (−9°C)
for 90 seconds following the start up of the compressor
during test mode

Page 20
505244M 10/09
Table 9. Defrost Control Board Description
ID Description
O Out 24 VAC output connection for reversing valve
LO−PS Connection for low−pressure switch
Y2 24 VAC output for second stage compressor solenoid
Y1 24 VAC common output, switched for enabling compressor
contactor
HI−PS Connection for high−pressure switch
P1 Seven position square pin header. P1 provides selection of
the defrost terminate temperature based on the position of
selection shunt, as well as selection pins for enabling the
field test mode.
P2 The following connections are provided in the seven posi-
tion P2 screw terminal block:
W1 24 VAC thermostat output for auxiliary heat op-
eration
C24 VAC system common
LService light thermostat connection
R24 VAC system power input
Y2 24 VAC thermostat input for second stage com-
pressor operation
O24 VAC thermostat input for reversing valve op-
eration
Y1 24 VAC thermostat input for first stage compres-
sor operation
P3 Five position square pin header. P3 provides selection of
the Y2 compressor lock−in temperature. Note: This is ap-
plicable for two stage compressor operations only.
P4 Six position square pin header. P4 provides connections for
the temperature sensors:
COIL (P4−5) Ground connection for outdoor coil tem-
perature sensor.
(P4−6) Connection for outdoor coil temperature
sensor.
AMB (P4−3) Ground connection for outdoor ambient
temperature sensor.
(P4−4) Connection for outdoor ambient tempera-
ture sensor.
DIS (P4−1) Ground connection for discharge temper-
ature sensor.
(P4−2) Connection for discharge temperature
sensor. Note: This is applicable for two stage
compressor operations only.
P5 Two position square pin header. P5 provides selection of
the 30−second compressor delay option.
P6 Eight position header. P6 provides connections for the fac-
tory test connections.
High Pressure Switch (HI−PS)
When the high pressure switch trips, the defrost board will
cycle off the compressor, and the strike counter in the
board will count one strike.
DEFROST BOARD PRESSURE SWITCH SETTINGS
High Pressure (auto reset) − trip at 590 psig; reset at
418 psig.
Low Pressure (auto reset) − trip at 25 psig; reset at 40
psig.
Low Ambient Thermostat Pins − P3 provides selection of
the Y2 compressor lock−in temperature. The XP14 series
heat pumps do not use a Y2 compressor and therefore
these pins are not active.
FIVE−STRIKE LOCKOUT FEATURE
The internal control logic of the board counts the pressure
switch trips only while the Y1 (Input) line is active. If a
pressure switch opens and closes four times during a Y1
(Input), the control logic will reset the pressure switch trip
counter to zero at the end of the Y1 (Input). If the pressure
switch opens for a fifth time during the current Y1 (Input),
the control will enter a lockout condition.
The five−strike pressure switch lockout condition can be
reset by cycling OFF the 24−volt power to the control board
or by shorting the TEST pins between 1 and 2 seconds. All
timer functions (run times) will also be reset.
If a pressure switch opens while the Y1 Out line is
engaged, a 5−minute short cycle will occur after the switch
closes.
ActuationWhen the reversing valve is de−energized,
the Y1 circuit is energized, and the coil temperature is
below 35°F (2°C), the board logs the compressor run time.
If the board is not calibrated, a defrost cycle will be initiated
after 30 minutes of heating mode compressor run time.
The control will attempt to self−calibrate after this (and all
other) defrost cycle(s).
Calibration success depends on stable system
temperatures during the 20−minute calibration period. If
the board fails to calibrate, another defrost cycle will be
initiated after 45 minutes of heating mode compressor run
time. Once the defrost board is calibrated, it initiates a
demand defrost cycle when the difference between the
clear coil and frosted coil temperatures exceeds the
maximum difference allowed by the control OR after 6
hours of heating mode compressor run time has been
logged since the last defrost cycle.
NOTE − If ambient or coil sensor fault is detected, the
board will not execute the TEST mode.
TerminationThe defrost cycle ends when the coil
temperature exceeds the termination temperature or after
14 minutes of defrost operation. If the defrost is terminated
by the 14−minute timer, another defrost cycle will be
initiated after 30 minutes of run time.
Each test pin shorting will result in one test event. For
each TEST the shunt (jumper) must be removed for at
least one second and reapplied. Refer to flow chart as
illustrated in figure 25 for TEST operation.
Test ModeWhen Y1 is energized and 24V power is
being applied to the board, a test cycle can be initiated by
placing the termination temperature jumper across the
TEST pins for two to five seconds. If the jumper remains
across the TEST pins longer than five seconds, the control
will ignore the TEST pins and revert to normal operation.
The jumper will initiate one cycle per test.