Lenox XP14, 50677201 User Manual
INSTALLATION
2011 Lennox Industries Inc.
Dallas, Texas, USA
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.
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, 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.
NOTICE TO INSTALLER
UNIT PLACEMENT
It is critical for proper unit operation to place outdoor unit on an elevated
surface as described in Unit Placement section on page 7.
BRAZING LINE SET TO SERVICE VALVES
Follow the brazing technique illustrated starting on page 12 to avoid
damaging the service valve’s internal seals.
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
system. See Defrost System section on page 29 for further details.
Also note that a low pressure bypass switch is required when operating
unit below 15ºF (page 28).
INSTRUCTIONS
Elite® Series XP14 Units
HEAT PUMPS
506772−01
08/11
Supersedes 06/11
TABLE OF CONTENTS
Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . .
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Number Identification 2. . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . . . . .
Caps and Fasteners Torque Requirements 4. . . . . . . .
Operating Gauge Set and Service Valves 4. . . . . . . . .
Recovering Refrigerant from Existing System 6. . . . .
New Outdoor Unit Placement 7. . . . . . . . . . . . . . . . . . .
Removing and Installing Panels 9. . . . . . . . . . . . . . . . .
Line Set Requirements 10. . . . . . . . . . . . . . . . . . . . . . . . .
Brazing Connections 12. . . . . . . . . . . . . . . . . . . . . . . . . . .
Indoor Refrigerant Metering Device Removal and
Flushing Line Set and Indoor Coil 15. . . . . . . . . . . . . . . .
Installing New Indoor Metering Device 16. . . . . . . . . . . .
Leak Test Line Set and Indoor Coil 17. . . . . . . . . . . . . . .
Evacuating Line Set and Indoor Coil 18. . . . . . . . . . . . .
Electrical Connections 19. . . . . . . . . . . . . . . . . . . . . . . . .
Unit Start−Up 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing and Weighing In Refrigerant for Units
Delivered Void of Charge 23. . . . . . . . . . . . . . . . . . . . . . .
Optimizing System Refrigerant Charge 25. . . . . . . . . . .
System Operation 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defrost System 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance (Dealer and Homeowner) 30. . . . . . . . . . .
Start−up and Performance Checklist 32. . . . . . . . . . . . . .
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.
1 Assembled XP14 outdoor unit
General
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.
Litho U.S.A.
08/11 506772−01
Page 1
*2P0811* *P506772-01*
Model Number Identification
Refrigerant Type
X = HFC−410A
Unit Type
P = Heat Pump Outdoor Unit
Series
Unit Dimensions Inches (mm)
A
P 14 036− −
X
LIQUID LINE
CONNECTION
ELECTRICAL INLETS
SUCTION LINE
CONNECTION
230
−
08
Voltage
230 = 208/230V−1ph−60hz
Nominal Cooling Capacity
018 = 1.5 tons
024 = 2 tons
030 = 2.5 tons
036 = 3 tons
042 = 3.5 tons
048 = 4 tons
060 = 5 tons
Minor Revision Number
C
9−1/2
(241)
8−1/4
(210)
4−3/4"
(121)
UNIT SUPPORT
FEET
16−7/8
(429)
8−3/4
(222)
3−1/8
(79)
B
TOP VIEW
30−3/4
(781)
UNIT SUPPORT
FEET
8−1/2
(216)
8−3/4
(222)
5−1/2
(140)
SIDE VIEW
13−1/2
(343)
4−1/2"
(108)
XP14−036 TO −060 BASE WITH
XP14−018, 024 AND 030 BASE SECTION
Model Number A B C
XP14−018−230 31 (787)
XP14−024−230 39 (991)
XP14−030−230 39 (991)
XP14−036−230 35 (889)
XP14−042−230 39 (991)
XP14−048−230 39 (991)
XP14−060−230 45 (1143)
30−1/2 (775) 35 (889)
35−1/2 (902) 39−1/2 (1003)
ELONGATED LEGS
26−7/8
(683)
3−3/4
(95)
4−5/8
(117)
506728−01
Page 2
Typical Unit Parts Arrangement
CONTROL PANEL
CAPACITOR (C12)
CONTACTOR−
1POLE (K1−1)
GROUND
LUG
TRUE SUCTION
PORT
REVERSING
VALV E
MUFFLER
5−TON UNIT
EXAMPLED HERE
DEFROST CONTROL
(CMC1)
ONLY ON UNITS
USING EXTERNAL
COMPRESSOR
THERMAL
PROTECTION
SWITCH (S173)
SWITCH
COVER
SWITCH
DEFROST
THERMOSTAT (S6)
CHECK EXPANSION
VALV E
REVERSING VALVE
SOLENOID
CRANKCASE HEATER
(−036, −042, −048 AND
060 UNITS ONLY)
LOW PRESSURE
SWITCH (S87)
LIQUID LINE
SERVICE VALVE
FIELD CONNECTION FOR VAPOR
LINE (ANGLE−TYPE − ALL SIZES
EXCEPT −060)
Figure 1. Typical Parts Arrangements
FIELD CONNECTION
FOR LIQUID LINE SET
Page 3
LIQUID LINE FILTER
DRIER (BI−FLOW)
CHECK EXPANSION VALVE
SENSING BULB
CRANKCASE HEATER THERMOSTAT (S40)
(−036, −042, −048 AND 060 UNITS ONLY)
HIGH PRESSURE SWITCH
(AUTO−RESET) (S4)
VAPOR LINE SERVICE
VALV E
FIELD CONNECTION
FOR VAPOR LINE
(BALL−TYPE −060 ONLY)
PLUMBING, SWITCHES AND
SENSOR COMPONENTS
XP14 SERIES
Caps and Fasteners Torque Requirements
When servicing or repairing HVAC equipment and
components, ensure the fasteners are appropriately
tightened. Table 1 list torque values for various caps and
fasteners.
Table 1. Torque Requirements
Parts Recommended Torque
Service valve cap 8 ft.− lb. 11 NM
Sheet metal screws 16 in.− lb. 2 NM
Machine screws #10 28 in.− lb. 3 NM
Compressor bolts 90 in.− lb. 10 NM
Gauge port seal cap 8 ft.− lb. 11 NM
Operating Gauge Set and Service Valves
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.
USING MANIFOLD GAUGE SET
When checking the system charge, only use a manifold
gauge set that features low−loss anti−blow back fittings.
Manifold gauge set used for HFC−410A refrigerant
systems must be capable of handling the higher system
operating pressures. The manifold gauges should be rated
for:
High side Pressure range of 0 − 800 pound−force per
square inch gauge (psig)
Low side Use with 30" vacuum to 250 psig with
dampened speed to 500 psig
Manifold gauge set hoses must be rated for use to 800
psig of pressure with a 4000 psig burst rating.
OPERATING SERVICE VALVES
The liquid and vapor line service valves are used for
refrigerant recovery, flushing, leak testing, evacuating,
weighing in refrigerant and optimizing system charge.
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.
BALL−TYPE SERVICE VALVE
1. Remove stem cap with an appropriately sized wrench.
2. Use an appropriately sized wrenched to open or close
valve.
A To open rotate stem counterclockwise 90°.
B To close rotate stem clockwise 90°.
TO INDOOR UNIT
BALL (SHOWN CLOSED)
VALVE STEM
2
SERVICE PORT
SERVICE PORT CORE
SERVICE PORT CAP
TO OUTDOOR UNIT
REMOVE
1
STEM CAP
Figure 2. Operating Ball−Type Service Valve
ANGLE−TYPE SERVICE VALVE
1. Remove stem cap with an appropriately sized wrench.
2. Use a service wrench with a hex−head extension
(3/16" for liquid line valve sizes and 5/16" for vapor line
valve sizes) to back the stem out counterclockwise as
far as it will go to open the service valve.
SERVICE PORT CAP
SERVICE PORT CORE
SERVICE PORT
When service valve is OPEN, the service port is open to line set,
indoor and outdoor unit.
TO INDOOR
When service valve stem is in the CLOSED position, the service
port is open to the line set and indoor unit.
CORE
TO INDOOR
UNIT
TO OUTDOOR UNIT
UNIT
TO OUTDOOR
UNIT
STEM CAP
VALVE STEM
SHOWN
CLOSED
(VALVE STEM
SHOWN
OPEN)
INSERT HEX
WRENCH
HERE
INSERT HEX−HEAD
2
EXTENSION HERE
REMOVE
1
STEM CAP
Figure 3. Operating Angle−Type Service Valve
506728−01
Page 4
To Access Service Port:
A service port cap protects the service port core from
contamination and serves as the primary leak seal.
1. Remove service port cap with an appropriately sized
wrench.
2. Connect gauge set to service port.
3. When testing is completed, replace service port cap and
tighten as follows:
With torque wrench: Finger tighten and torque cap per
table 1.
Without torque wrench: Finger tighten and use an
appropriately sized wrench to turn an additional 1/6
turn clockwise.
12
11
10
9
8
7
6
Reinstall Stem Cap:
Stem cap protects the valve stem from damage and serves
as the primary seal. Replace the stem cap and tighten as
follows:
1/6 TURN
1
2
3
4
5
With Torque Wrench: Finger
tighten and then torque cap per table 1.
Without Torque Wrench: Finger tighten
and use an appropriately sized wrench to turn an
additional 1/12 turn clockwise.
1/12 TURN
12
11
10
9
8
1
2
3
4
5
7
6
IMPORTANT
Only use Allen wrenches of sufficient hardness (50Rc −
Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.
Service valve stems are factory−torqued (from 9 ft−lbs for
small valves, to 25 ft−lbs for large valves) to prevent
refrigerant loss during shipping and handling. Using an
Allen wrench rated at less than 50Rc risks rounding or
breaking off the wrench, or stripping the valve stem
recess.
See the Lennox Service and Application Notes
Corp.0807−L5 (C−08−1) for further details and
information.
Page 5
XP14 SERIES
Recovering Refrigerant from Existing System
DISCONNECT POWER
Disconnect all power to the existing outdoor unit at the disconnect
1
switch and/or main fuse box/breaker panel.
MAIN FUSE
BOX/BREAKER
PANEL
DISCONNECT
SWITCH
RECOVERING REFRIGERANT
3
Remove existing HCFC−22 refrigerant using one of the following procedures:
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.
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.
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.
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.
C When the low side system pressures reach 0 psig, close the vapor line valve.
D Check gauges after shutdown to confirm that the valves are not allowing
refrigerant to flow back into the low side of the system.
CONNECT MANIFOLD GAUGE SET
Connect a manifold gauge set, clean recovery cylinder and a
2
recovery machine to the service ports of the existing unit.
NOTE Use the recovery machine instructions to make
the correct manifold gauge set connections for recovery
refrigerant. The illustration below is a typical connection.
MANIFOLD GAUGES
RECOVERY MACHINE
LOW
CLEAN RECOVERY
CYLINDER
OUTDOOR UNIT
METHOD 2 LIMITATIONS
NOTE When using Method 2, the listed devices
below could prevent full system charge recovery into
the outdoor unit:
Outdoor unit’s high or low−pressure switches (if
applicable) when tripped can cycle the
compressor OFF.
Compressor can stop pumping due to tripped
internal pressure relief valve.
Compressor has internal vacuum protection that
is designed to unload the scrolls (compressor
stops pumping) when the pressure ratio meets a
certain value or when the suction pressure is as
high as 20 psig. (Compressor suction
pressures should never be allowed to go into
a vacuum. Prolonged operation at low suction
pressures will result in overheating of the
scrolls and permanent damage to the scroll
tips, drive bearings and internal seals.)
Once the compressor can not pump down to a lower
pressure due to 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.
HIGH
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
New Outdoor Unit Placement
CAUTION
In order to avoid injury, take proper precaution when lifting heavy objects.
Remove existing outdoor unit prior to placement of new
outdoor unit. See Unit Dimensions on page 2 for sizing
mounting slab, platforms or supports. Refer to figure 5 for
mandatory installation clearance requirements.
POSITIONING CONSIDERATIONS
Consider the following when positioning the unit:
Some localities are adopting sound ordinances based
on the unit’s sound level registered from the adjacent
property, not from the installation property. Install the
unit as far as possible from the property line.
When possible, do not install the unit directly outside
a window. Glass has a very high level of sound
transmission. For proper placement of unit in relation
to a window see the provided illustration in figure 6,
detail A.
PLACING UNIT ON SLAB
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.
NOTE If necessary for stability, anchor unit to slab as
described in figure 6, detail D.
ELEVATING THE UNIT
Units are outfitted with elongated support feet as illustrated
in figure 6, detail C.
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.
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.
ROOF MOUNTING
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
rooftop applications. See figure 6, detail F for other roof top
mounting considerations.
NOTICE
Roof Damage!
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.
CLEARANCE ON ALL SIDES INCHES (MILLIMETERS)
NOTES:
Service clearance of 30 inches (762 mm) must be
maintained on one of the sides adjacent to the
control panel
Clearance to one of the other three sides must be 36
inches (914mm).
Clearance to 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
MINIMUM CLEARANCE
ABOVE UNIT
48 (1219)
Page 7
XP14 SERIES
DETAIL A
Install unit away from windows.
Outside Unit Placement
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.
Slab Mounting at Ground Level
BUILDING
STRUCTURE
MOUNTING
SLAB
TWO 90° ELBOWS INSTALLED IN LINE SET WILL
REDUCE LINE SET VIBRATION.
Elevated Slab Mounting
DETAIL C
LEG DETAIL
2" (50.8MM) SCH 40
FEMALE THREADED
2" (50.8MM) SCH 40
MALE THREADED
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.
DETAIL E
using Feet Extenders
ADAPTER
ADAPTER
Deck Top Mounting
BASE
GROUND LEVEL
DETAIL D
#10 1/2" LONG SELF−DRILLING
SHEET METAL SCREWS
STABILIZING BRACKET (18 GAUGE
METAL 2" WIDTH; HEIGHT AS
#10 1−1/4" LONG HEX HD SCREW
Concrete slab use two plastic anchors (hole
drill 1/4")
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.
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.
Slab Side Mounting
COIL
BASE PAN
REQUIRED)
AND FLAT WASHER
CORNER POST
Roof Top Mounting
PREVAILING WINTER WINDS
WIND BARRIER
INLET AIR
506728−01
One bracket per side
(minimum). For extra
stability, two brackets per
side, two inches (51mm)
from each corner.
SAME FASTENERS AS
SLAB SIDE MOUNTING.
Figure 6. Placement, Slab Mounting and Stabilizing Unit
MINIMUM ONE
PER SIDE
FOR EXTRA
STABILITY
Page 8
INLET AIR
INLET AIR
INLET AIR
Removing and Installing Panels
LOUVERED PANEL REMOVAL
Remove the louvered panels as follows:
1. Remove two screws, allowing the panel to swing open
slightly.
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.
3. Move panel down until lip of upper tab clears the top slot in
corner post as illustrated in detail A.
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:
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.
Detail C
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.
SCREW
LIP
HOLES
Detail A
Detail B
ROTATE IN THIS DIRECTION;
ANGLE MAY BE TOO
EXTREME
THEN DOWN TO REMOVE
HOLD DOOR FIRMLY TO THE HINGED
PANEL
SIDE TO MAINTAIN
FULLY−ENGAGED TABS
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
Line Set Requirements
This section provides information on: installation of new or
replacement line set.
Adding Polyol ester oil requirements
New or replacement line set installation
Using existing line set.
ADDING POLYOL ESTER OIL REQUIREMENTS
IMPORTANT
Mineral oils are not compatible with HFC−410A. If oil
must be added, it must be a Polyol Ester oil.
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.
For systems over 20 pounds − add one ounce for every five
(5) pounds of HFC−410A refrigerant.
Recommended topping−off POE oils are Mobil EAL
ARCTIC 22 CC or ICI EMKARATE RL32CF.
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.
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.
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:
Table 2. Refrigerant Line Set Inches (mm)
Model
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) 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
Valve Field Connections Recommended Line Set
Liquid Line Vapor Line Liquid Line Vapor Line L15 Line Sets
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)
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)
Model (XP14) and size of unit (e.g. −036).
Line set diameters for the unit being installed as listed
in table 2 and total length of installation.
Number of elbows vertical rise or drop in the piping.
USING EXISTING LINE SET
Things to consider:
Liquid line that meter the refrigerant, such as RFC1
liquid line, must not be used in this application.
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
Flushing Line Set and Indoor Coil on page 15).
If existing line set is being used, then proceed to Brazing
Connections on page 11.
IMPORTANT
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.
IMPORTANT
If this unit is being matched with an approved line set
or indoor unit coil which was previously charged with
mineral oil, or if it is being matched with a coil which
was manufactured before January of 1999, the coil
and line set must be flushed prior to installation. Take
care to empty all existing traps. Polyol ester (POE) oils
are used in Lennox units charged with HFC−410A
refrigerant. Residual mineral oil can act as an
insulator, preventing proper heat transfer. It can also
clog the expansion device, and reduce the system
performance and capacity.
Failure to properly flush the system per the
instructions below will void the warranty.
506728−01
Page 10
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