Lennox XP15 User manual

®
,1,_2008LennoxindustriesInc,
Dallas,Texas,USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
X_ WARNING
_, CAUTION
INSTALLATION
INSTRUCTIONS
Dave Lennox Signature ®
Collection XP15 Units
HEAT PUMP UNITS _-_Technical
505,328M U£[ Publications
04/08 Litho U.S.A.
Supersedes 03/08
XP15 Outdoor Unit ............................ 1
Shipping and Packing List ...................... 1
Unit Dimensions ............................... 2
General Information ........................... 2
Recovering Refrigerant from Existing System ..... 4
Positioning New Outdoor Unit .................. 5
Removing Panel .............................. 6
Electrical Connections ......................... 7
New or Replacement Line Set ................... 9
Brazing Line Set Connections ................... 11
Removing Existing Refrigerant Metering Device . .. 11
Testing for Leaks .............................. 11
Removing Service Valve Port Core .............. 12
Flushing Existing System ....................... 12
Installing New Refrigerant Metering Device ....... 13
Installing Service Valve Port Core ............... 14
Evacuating the System ......................... 14
Start-Up Procedures ........................... 15
System Operations ............................ 19
Lennox System Operation Monitor (LSOM) ....... 19
Defrost System ............................... 21
Maintenance .................................. 26
Homeowner Information ........................ 26
Start-Up and Performance Checklist ............. 28
AIMPORTANT
IMPORTANT
The Lennox XP15 outdoor units use HFC-410A
refrigerant, This unit must be installed with a matching
indoor coil and line set as outlined in the Lennox
Engineering Handbook, XP15 series outdoor units are
designed for use in check expansion valve (CTXV)
systems only, and are not designed to be used with other
refrigerant flow control devices. The Lennox Engineering
Handbook lists compatible indoor CTXV kits which are
ordered separately.
1 - Assembled XP15 outdoor unit
1 - Bushing (for low voltage wiring)
2 - Grommets (for liquid and vapor lines)
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.
04/08
IIIHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Page 1 505,328M IIIIIIIIIIIIIIIIIIIIIIHIIIIIIIIIIIIIIIIIIIIIIII

39-1/2 DISCHARGE AIR
(1003) t
UNIT SUPPORT
FEET \
Y
16-7/8
(429)
8 -3/4
(2_2)
3-1/8
(79) "-_
SIDE VIEW
®®®
ELECTRICAL IN_ETS __
37 (94O)
[-024 thru -042]
47 (1194)
[-048 and -060]
VAPOR LINE
INLET
LIQUID LINE
/INLET
4-7/16.__
(113)
18!1/2
(470) 7--
8 (203)
&CONTACTOR
DEFROST CONTROL
SYSTEM
OPERATION MONITOR
VAPOR VALVE AND
26-7/8 GAUGE PORT ..
(6_3) DISCHARGE LINE
3-3/4 (95) VAPOR
_' FILTER
4-5/8
(117)
BASE WITH ELONGATED LEGS
WARNING I
1 (25)
35-1/2
(902)
ACCESS VIEW
FAN
CAPACITOR
COMPRESSOR
DOME
COMPRESSOR
PLUG
LOW PRESSURE
HIGH PRESSURE
SWITCH
XP15 Parts Arrangement
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
When servicing or repairing HVAC components, ensure
caps and fasteners are appropriately tightened. Table 1
lists torque values for typical service and repair items.
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 #10 28 in.- lb. 3 NM
Compressor bolts 90 in.- lb. 10 NM
Gauge port seal cap 8 ft.- lb. 11 NM
505328M 04/08
Page 2

USINGMANIFOLD GAUGE SETS
HFC-410A refrigerant manifold gauge sets must be
capable of handling higher system operating pressures.
The gauge set shall be rated for use with pressures of 0 -
800 psig on the high side, and a low side of 30 inches of
vacuum (Hg) to 250 psig, which retards when opened to
500 psig. Gauge hoses must be rated for use up to 800 psig
of pressure with a 4000 psig burst rating,
OPERATING SERVICE VALVES
IMPORTANT
The liquid and vapor lines service valves with gauge ports
as illustrated in figures 2 and 3 are used for removing
refrigerant, flushing, leak testing, evacuating, checking
charge and charging,
Each valve is equipped with a service port which has a
factory-installed valve stem.
1/6 TURN 1/12 TURN
This illustrates how to use a wrench to tighten caps an additional
1/6 or 1/12 turn clockwise.
Figure 1. Cap Tightening Distances
IMPORTANT
Operating Angle-Type Service Valve
To Access Angle-Type 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 using an appropriately sized
wrench.
2. Connect gauge to the service port.
3. When testing iscompleted, replace service port cap and
tighten as follows:
•With Torque Wrench: Finger tighten and then
tighten per table 1 on page 2.
• Without Torque Wrench: Finger tighten and with an
appropriately sized wrench to turn an additional
1/6 turn clockwise as illustrated in figure 1.
To Open and Close Angle-Type Service Valve:
A valve stem cap protects the valve stem from
contamination and assures a leak-free seal.
1, Remove stem cap with a 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.
3. Replace the stem cap and tighten as follows:
• With Torque Wrench: Tighten finger tight and then
tighten per table 1 on page 2.
• Without Torque Wrench: Finger tighten and with an
appropriately sized wrench to turn an additional
1/12 turn clockwise as illustrated in figure 1,
NOTE -A label with specific torque requirements may be
affixed to the stem cap, If the label is present, use the
specified torque listed,
SERVICE PORT CAP o
SERVICE PORT _
CORE _ _ "i
CLOSED TO BOTH
INDOOR AND
OUTDOOR UNITS]
VALVE STEM
FRON%SEATEI_
TO INDOOR
UNIT
TO OUTDOOR _
UNIT
VALVE IS FRONT-SEATED
(CLOSED)
jSERV,CEPORT
,, HHERE
SERVICE PORT CAP _ _:_ VALVE IS(oPENED)BACK=SEATED
SERVICE PORT _
CORE SERVICE PORT
OPEN TO BOTH
INDOOR AND (VALVE STEM
OUTDOOR UNITS] L _ _ SHOWNOPEN)INSERTHEX
VALVE STEM WRENCH HERE
BACKED-SEATE_ __
TO INDOOR
UNIT
TO OUT UNIT
Figure 2. Angle -Type Service Valve
Page 3
XP15 SERIES

Operating Bali-Type Service Valve
To Access Bali-Type 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 using an appropriately sized
wrench,
2. Connect gauge to the service port.
3, When testing iscompleted, replace service port cap and
tighten as follows:
•With Torque Wrench: Finger tighten and then
tighten per table table 1 on page 2.
• Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional
1/6 turn clockwise as illustrated in figure 1,
To Open and Close Bali-Type Service Valve:
A valve stem cap protects the valve stem from
contamination and assures a leak-free seal,
1, Remove stem cap with a wrench,
2, Use an adjustable wrench to open, To open valve,
rotate stem counterclockwise 90°, To close rotate
stem clockwise 90°.
3, Replace the stem cap and tighten as follows:
• With Torque Wrench: Finger tighten and then
tighten per table 1 on page 2.
• Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional
1/12 turn clockwise as illustrated in figure 1.
NOTE -A label with specific torque requirements may be
affixed to the stem cap. If the label is present, use the
specified valve listed.
To INDOOR UNIT
Open to line set when valve
is closed, to both line set
and unit when valve is open. Ball (Shown Closed)
Valve Stem
Service Port
Service Port
Core
Service Port
Cap
To outdoor unit
t
STEM CAP
Use Adjustable Wrench To open: rotate Stem Counter-Clock-
wise 90°.To close: rotate Stem clockwise 90°.
Figure 3. Bali-Type Service Valve
Remove existing HCFC-22 refrigerant using one of the
following methods:
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 or refrigerant to flush the system:
1, Disconnect all power to the existing outdoor unit,
2, Connect to the existing unit a gauge set, clean
recovery cylinder and a recovery machine. Use the
instructions provided with the recover machine on how
to setup the connections,
3, Remove all HCFC-22 refrigerant from the existing
system, Check gauges after shutdown to confirm that
the entire system is completely void of refrigerant,
4, Disconnect the liquid and vapor lines from the existing
outdoor unit,
5, Remove the existing outdoor unit,
NOTE -Use recovery machine instructions for specific
setup requirements.
Recovery Machine
\
Clean Recovery Cylinder
Manifold Gauges
/
Outdoor/_Unit
Figure 4. Typical Refrigerant Recovery (Method 1)
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 -
1, Start the existing HCFC-22 system in the cooling
mode and close the liquid line valve,
2, Pump all of the existing HCFC-22 refrigerant back into
the outdoor unit,
NOTE -It may be necessary to bypass the low pressure
switches to ensure complete refrigerant evacuation.
505328M 04/08
Page 4

3.Whenthelowsidesystempressuresreach0 psig,
closethevaporlinevalve,
4. Disconnectall powerto theexistingoutdoorunit.
Checkgaugesaftershutdownto confirmthat the
valvesarenotallowingrefrigeranttoflowbackintothe
lowsideofthesystem,
5. Disconnecttheliquidandvaporlinesfromtheexisting
outdoorunit.
6. Removetheexistingoutdoorunit,
CAUTION
See Unit Dimensions on page 2 for sizing mounting slab,
platforms or supports, Refer to figure 5 for mandatory
installation clearance requirements.
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)
48 in, (1219 ram) clearance required on top of unit,
A clearance of 24 in, (610 mm) must be maintained between two
units
Figure 5. Installation Clearances
POSITIONING CONSIDERATIONS
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.
Install unit away
from windows
Two 90° elbows installed in line set -
will reduce line set vibration.
Figure 6. Outside Unit Placement
PLACING UNIT ON SLAB
When installing a unit at grade level, the top of the slab
should be high enough above the grade so that water from
higher ground would not collect around the unit as
illustrated in figure 7. Slab may be level or have a slope
tolerance away from the building of not more than two
degrees, or 2 inches per 5 feet (51 mm per 1524 mm).
Install unit level or, if on a slope, maintain slope tolerance of 2
degrees (or 2 inches per 5 feet [50 mm per 1.5 m]) away from
building structure.
Building
Structure
J
7/ Mounting
Slab
-T--
Figure 7. Ground Level Slab Mounting
INSTALLING UNIT ON ROOF
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.
If unit coil cannot be mounted away from prevailing winter
winds, a wind barrier should be constructed as illustrated in
figure 8. 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.
Page 5
XP15 SERIES

PREVAILING _.
WINTER WINDS
I WIND BARRIER
INLET AIR ,_
INLETAIR
O INLET AIR
1
2_'_6" 10 ram)
With unit positioned at installation site, remove two side
Iouvered panels to expose the unit base pan. Install the
brackets as illustrated in figure 10 using conventional
practices; replace the panels after installation is complete.
IMPORTANT
Figure 8. Rooftop Application and Wind Barrier
NOTE -If necessary for stability, anchor unit to slab as
described in Stabilizing Unit on Uneven Surfaces.
ELEVATING THE UNIT
These units are outfitted with elongated-shaped feet as
illustrated in figure 9.
BASE
LEG DETAIL 2"(50.8MM)
SCH 40
FEMALE
THREADED
ADAPTER
Figure 9. Elevated Slab Mounting using Feet
Extenders (Larger Base Units)
If additional elevation is necessary, raise the unit by
extending the height 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 adapters
which can be threaded into the female threaded adapters
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.
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.
Page 6
Slab Side Mounting
#101/2" LONG
SELF-DRILLING SHEET
METAL SCREWS /
STABILIZING BRACKET
(18 GAUGE METAL - 2"
RW/DTDHi HEIGHT AS _,_1 f, _
#10 1-1/4" LONG HEX
HD SCREW AND
FLATWASHER
PLASTIC ANCHOR - USE IF CONCRETE
(HOLE DRILL 1/4"); NOT IF PLASTIC SLAB
(HOLE DRILL 1/8").
IDeck Top
Mounting
STABILIZING MINIMUM 1
BRACKET (18 PER SIDE
GAUGE METAL - 2"
WIDTH; HEIGHT
AS REQ'D); BEND
TO FORM RIGHT FOR EXTRA
ANGLE STABILITY
ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY,
TWO BRACKETS PER SIDE, 2" FROM EACH CORNER.
Figure 10. Installing Stabilizer Brackets
CAUTION
505328M 04/08

REMOVE4SCREWSTOREMOVEPANELFOR
ACCESSINGCOMPRESSORANDCONTROLS.
_ INSTALLBYPOSITIONINGPANELWITHHOLES
ALIGNED;INSTALLSCREWSANDTIGHTEN.
Figure 11. Access Panel
IMPORTANT! DO NOT ALLOW K-_
PANELS TO HANG ON UNIT BY
TOP TAB. TAB IS FOR ALIGNMENT )
ANDNOTDESIGNEDTOSUPPORT
WE,GHTOFPANEL
PANEL SHOWN SLIGHTLY _ _
ROTATED TO ALLOW TOP TAB TO _
EXIT (OR ENTER) TOP SLOT FOR _
REMOVING (OR INSTALLING) _
PANEL.
SCREW
L. HOLES......_ _iiii_///l _
U
ii t_
Detail A
Detail B -_-_\_
ROTATE IN THIS DIRECTION;
THEN DOWN TO REMOVE PANEL
MAINTAIN MINIMUM PANEL ANGLE (AS CLOSE TO PARALLEL WITH THE UNIT
AS POSSIBLE) WHILE INSTALLING PANEL. HOLD DOOR FIRMLY ALONG
ANGLE MAY BE TOO THE HINGED SIDE TO MAINTAIN
EXTREME FULLY-ENGAGED TABS
PREFERRED ANGLE
FOR INSTALLATION
Detail D
Figure 13. Removing/Installing Louvered Panels
(Detail D)
ACCESS PANEL
Removal and reinstallation of the access panel is
illustrated in figure 11,
LOUVERED PANELS
Remove the Iouvered 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 figure 12, detail B.
3, Move panel down until lip of upper tab clears the top
slot in corner post as illustrated in figure 12, detail A,
Position and Install Panel--Position the panel almost
parallel with the unit as illustrated in figure 13, detail D 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 12, 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.
Figure 12. Removing/Installing Louvered Panels
(Detail A, B and C)
A'kWARNING
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),
ELECTRICAL AND CONTROL CONNECTIONS
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.
NOTE -Connect conduit to the unit using a proper conduit
fitting. Units are approved for use only with copper
conductors. A complete unit wiring diagram is located on
the back side of the unit's access panel.
NOTE -For proper voltages, select thermostat wire gauge
per the following chart:
Page 7
XP15 SERIES

Table 2. Wire Run Length
Wire Run Length AWG # Insulation Type
less than 100' (30m) 18 color-coded, temperature
more than 100' (30m) 16 rating 35°C minimum
1. Install room thermostat (ordered separately) on an
inside wall approximately in the center of the area and
5 feet (1.5 m) from the floor. Do not install on an outside
wall or where sunlight, drafts or vibrations affect it.
2. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit as illustrated in
figure 14.
3. Install line voltage power supply to unit from a properly
sized disconnect switch as illustrated in figure 15.
4. Ground unit from ground lug as illustrated in figure 15
to unit disconnect switch, or to an earth ground.
LI _._
z_
RTI$
AMBIENT
SENSOR
@
R721 DEFROST
COIL SENSOR
S4HIGH
PRESSURE
SWITCH
$87 LOW
PRESSURE
SWITCH
©
LI
REVERSING
VALVE
©
LZ_
OMPRESSOR
CONTACTOR
54O
AI32
BI
HRI A
w
AI32
A
EQUIPMENT
GROUND
COMPRESSOR
CONTACTOR
BLACK TBI
(W5_
(W8
"-(v _
G
©
@
CB31MV
CBX32MV A2 SIGNATURE
81M2B
TWISTEO
PAIR
•I
A NOTE
FOR USE WITH COPPER CONDUCTORS ONLY.
REFER TO UNIT RATING PLATE FOR
MINIMUM CIRCUIT AMPACITY AND
MAXIMUM OVER CURRENT PROTECTION SIZE
A REFER TO COMPRESSOR N UNIT
FOR ACTUAL TERMINAL mRmANGEMENT.
Z_ WARNING
ELECTRIC SHOCK HAZARD,CAN CAUSE INJURY
OR DEATH.UNIT MUST BE GROUNDED IN
ACCOROANCE WITH NATIONAL AND LOCAL CODES.
A RTI4 SENSOR, OUTDOOR TEMP (OPTIONAL)
LINE VOLTAGE FIELD INSTALLED
CLASS II VOLTAGE FIELD INSTALLED
Figure 14. Typical Low-Voltage Field Wiring
GROUND
208-230/60/1 L1
L2
K1-1 COMPRESSOR CONTACTOR
GROUNDLUG CONTROLBOX _'-
CONTACTOR
DEFROST CONTROL
BOARD (DCB)
-''_/ L_)NNNTOoXRt LYs'<oTE_ OPERATION
"__ _[3_/ _ CAPACITOR
WARNING! - ELECTRIC SHOCK HAZARD. Can cause INJURY or DEATH. Unit must be grounded in accordance with national and local codes.
NOTE - For use with copper conductors only. Refer to unit rating plate for minimum circuit ampacity and maximum over-current protection size.
Figure 15. Typical High-Voltage Field Wiring (Unit Panel)
505328M 04/08
Page 8

This sectionprovidesinformationon installationor
replacementofexistinglinesets.Iflinesetsarenotbeing
installedorreplace,thenproceedtoBrazing Connections
on page 11.
If refrigerant lines are routed through a wall, 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.
REFRIGERANT LINE SET
Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit (sweat connections) to the indoor unit
coil (flare or sweat connections). Use Lennox L15 (sweat,
non41are) series line sets, or use field-fabricated
refrigerant lines as listed in table 3.
MATCHING WITH NEW OR EXISTING INDOOR COIL
AND LINE SET
IMPORTANT
When installing refrigerant lines longer than 50 feet, see
the Lennox Refrigerant Piping Design and Fabrication
Guidelines, or contact Lennox Technical Support Product
Applications for assistance. To obtain the correct
information from Lennox, be sure to communicate the
following points:
Model (XP15) and size (e.g. -060) of unit.
Line set diameters for the unit being installed (from
table 3)
Number of elbows and if there is a rise or drop of the
piping.
Line sets for heat pump applications can not be installed
underground. For more information see the Lennox
Refrigerant Piping Design and Fabrication Guidelines, or
contact Lennox Technical Support Product Applications
for assistance.
Table 3. Refrigerant Line Sets
Valve Sizes Recommended Line Set
Model Liquid Vapor Liquid Vapor L15
Line Line Line Line LineSets
-024 3/8 in. 3/4 in. 3/8 in 3/4 in. L15-41
-030 (10mm) (19mm) (10mm) (19mm) 15-50ft.
-- (5 - 15 m)
-036
-042 3/8 in. 7/8 in 3/8 in. 7/Sin L15-65
15 - 50 ft.
(10mm) (22mm) (10mm) (22mm) (5-15m)
3/8 in. 1-1/8 in, 3/8 in. 1-1/8 in, Field
-060 (10 ram) (29 ram) (10 ram) (29 ram) Fabricated
INSTALLING LINE SET
Line Set Isolation--This reference illustrates
procedures, which ensure proper refrigerant line set
isolation:
• Installation of line sets on horizontal runs is
illustrated in figure 16.
• Installation of line sets on vertical runs is illustrated
in figure 17 on page 10.
• Installation of a transition from horizontal to
vertical is illustrated in figure 18 on page 10.
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
STRAPPING MATERIAL
(AROUND VAPOR LINE
ONLY)
8 FEET TAPE OR
WIRE TIE
STRAP THE VAPOR LINE TO THE
METAL JOIST OR RAFTER AT 8 FEET
SLEEVE INTERVALS THEN STRAP THE
TAPE OR LIQUID LINE TO THE VAPOR LINE.
FLOOR JOIST OR _ _ _%
ROOF RAFTER _-
_._ I1
Figure 16. Refrigerant Line Sets: Installing
Horizontal Runs
Page 9
XP15 SERIES

IMPORTANT-
OUTSIDEWALLREFRIGERANTLINESMUST
NOTCONTACTWALL.VAPORLINELIQUIDLINE
NOTE-SIMILAR
INSTALLATION
PRACTICESSHOULDBE
USEDIFLINESETISTO
BEINSTALLEDON
EXTERIOROFOUTSIDE
WALL.
VAPORLINEWRAPPED
WITHARMAFLEX
PVC_ CAULK
PIPE FIBERGLASS
INSULATION
IMPORTANT!
REFRIGERANTLINES
MUSTNOTCONTACT
STRUCTURE.
ANCHOREDHEAVY
NYLONWIRETIE
WALL
STUD
METALSLEEVE
AUTOMOTIVE
MUFFLER-TYPEHANGER
WALL
STUD
STRAPLIQUIDLINE
TOVAPORLINE
JIDLINE
VAPORLINE-WRAPPED
INARMAFLEX
IUIDLINE
TOVAPORLINE
LIQUID
LINE
VAPORLINEWRAPPED
METALSLEEVE INARMAFLEX
Figure 17. Refrigerant Line Sets: Installing Vertical
Runs (New Construction Shown) Figure 18. Refrigerant Line Sets: Transition from
Vertical to Horizontal
1
CUT AND DEBUR
INSTALL CORE ONLY FOR
3OTH SERVICE PORTS after they
have coolED.
INDOOR UNIT
REMOVE CAP AND CORE FROM
BOTH LIQUID AND SUCTION
SERVICE PORTS
outdoor
UNIT
SERVICE PORT MUST BE
OPEN TO ALLOW EXIT
POINT FOR NITROGEN SERVICE
j SUCTION LINE _/VALVE
_QU_DUNE SERV_CEJ
VALVE
Figure 19. Brazing Connections
Page 10
505328M 04/08

ISOLATION GROMMETS
Locate the provided isolation grommets Slide grommets
onto vapor and liquid lines Insert grommets into mullion to
isolate refrigerant lines from sheet metal edges
Use the following procedure to braze the line set to the new
outdoor unit Figure 19 is provided as a general guide for
preparing to braze the line sets to the outdoor unit
Before brazing, remove the access panel as illustrated in
figure 11; then remove the narrow piping panel to prevent
burning off the paint as illustrated in figure 20
REMOVE TWO SCREWS
AND REMOVE PANEL
BEFORE BRAZING
LINE SET
CONNECTION
POINTS
Figure 20. Piping Panel Removal
WARNING
_WARNING
underneath the valve body to protect the base paint,
Also, shield the light maroon R-410A sticker.
5. Flow regulated nitrogen (at 1 to 2 psig) through the
refrigeration gauge set into the valve stem port
connection on the liquid line service valve and out of
the valve stem port connection on the vapor service
valve. The CTXV metering device at the indoor unit
coil will allow low pressure nitrogen to flow through the
system,)
Note: Use silver alloy brazing rods with five or six percent
minimum silver alloy for copper-to-copper brazing or 45
percent silver alloy for copper-to-brass or copper-to-steel
brazing,
6. Braze the line set to the liquid line service valve. Turn
off nitrogen flow, Repeat procedure starting at
paragraph 4 for brazing the vapor line set to service
valve,
After brazing the vapor line set to the service valve,
disconnect gauge from service port, remove wrapping and
replace service port cores.
Remove the existing HCFC-22 refrigerant flow control
orifice or thermal expansion valve from the indoor coil.
Existing devices are not approved for use with HFC-410A
refrigerant and may prevent proper flushing. Use a
field-provided fitting to reconnect lines, See figure 23 on
page 13 for disassembly and typical removal instructions.
After the line set has been connected to both the indoor
and outdoor units, check the line set connections at both
the indoor and outdoor units unit for leaks. Use the
following procedure to test for leaks:
IMPORTANT
WARNING
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. Remove service cap and core from both the vapor and
liquid line service ports.
3. Connect gauge low pressure side to liquid line service
valve,
4. To protect components during brazing, wrap a wet
cloth around the liquid line service valve body and
copper tube stub and use another wet cloth
Page 11
AWARNING
XP15 SERIES

WARNING I OUTOOORO.,T
SERVICE VALVE
1 Connect an HFC410A 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.)
2 With both manifold valves closed connect the cylinder
of HFC410A refrigerant to the center port of the
manifold gauge set 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
4 Weigh in a trace amount of HFC410A [,4 trace
amount is a maximum of two ounces (57 g) refrigerant
or three pounds (31 kPa) pressure].
5, Close the valve on the HFC-410A cylinder and the
valve on the high pressure side of the manifold gauge
set.
6. Disconnect the HFC-410A cylinder,
7, Connect a cylinder of dry nitrogen with a pressure
regulating valve to the center port of the manifold
gauge set,
8, Adjust dry nitrogen pressure to 150 psig (1034 kPa),
9, Open the valve on the high side of the manifold gauge
set in order to pressurize the line set and the indoor unit,
10, 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,
11, After leak testing disconnect gauges from service
ports,
REMOVE SERVICE
PORT CAP
REMOVE PORT CORE
Figure 21. Typical Service Valve Port Core Removal
AIMPORTANT
A IMPORTANT
ACAUTION
AIMPORTANT
Remove both of the outdoor unit's service port cores (liquid
and vapor) as illustrated in figure 21,
If new lines are used then proceed to Installing New
Refrigerant Metering Device. Otherwise proceed with the
following procedure,
505328M 04/08
Page 12

REQUIRED EQUIPMENT
Equipment required to flush the existing line set and indoor
unit coil:
• Two clean HCFC-22 recovery bottles,
• Oilless recovery machine with pump-down feature,
• Two gauge sets (one for HCFC-22; one for
HFC-410A),
RECOVERY MACHINE
NOTE -The inverted HCFC-22 cylinder must contain at least the same
amount of refrigerant as was recovered from the existing system.
Figure 22. Typical Flushing Connection
PROCEDURE
1, Verify that the existing HCFC-22 refrigerant flow
control device has been removed before continuing
with flushing procedures. Existing devices are not
approved for use with HFC-410A refrigerant and may
prevent proper flushing.
2, Connect an HCFC-22 cylinder with clean refrigerant to
the vapor service valve. Connect the HCFC-22 gauge
set to the liquid line valve. Connect a recovery
machine with an empty recovery tank to the gauge set
as illustrated in figure 22.
3, Set the recovery machine for liquid recovery and start
the recovery machine. Open the gauge set valves to
allow the recovery machine to pull a vacuum on the
existing system line set and indoor unit coil.
4, 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,
5, 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
unit coil. A second flushing may be done (using clean
refrigerant) if insufficient amounts of mineral oil were
removed during the first flush. Each time the system is
flushed, you must allow the recovery machine to pull a
vacuum on the system at the end of the procedure.
Page1
6, 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.
XP15 units are used in check thermal expansion valve
(CTXV) systems only, See the indoor unit coil installation
instructions and the Lennox Engineering Handbook for
approved CTXV match-ups and application information.
Table 3 on page 9 lists liquid and vapor line sizes and
corresponding line sets,
(Uncased Coil Shown)_ -
TWO PIECE PATCH
I EXPA )RI FICE _""_
PLATE(UNCASED OR
COIL ONLY) ORIFICE NSION VALVE
HOUSING I (SEE NOTE)
TUBES
ACCESS FITTING
(NO VALVE CORE)
On smaller vapor lines, bulb may be
mounted on top or side-mounted (prefer-
ably at 3 o'clock position).
On 518"and larger lines, mount bulb
approximately at the 4 or 8 o'clock posi-
tions; never mount on bottom of line.
o@clock
NOTE - If necessary, remove HCFC-22 flow control device (fixed
orifice/check expansion valve) from existing line set before instal-
ling HFC-410A approved expansion valve and o-ring.
Figure 23. Typical Metering Device Installation
The thermostatic expansion valve or check /thermostatic
expansion valve, can be installed internal or external to the
indoor coil. In applications where an uncased coil is being
installed in a field provided plenum, install the CTXV and
provide an access for field servicing of the CTXV. Refer to
Figure 23 for reference during installation of CTXV,
XP15 SERIES

1, On fully cased coils, remove the coil access and
plumbing panels,
2, Remove any shipping clamps holding the liquid line
and distributor assembly,
3. Using two wrenches, disconnect liquid line from
distributor. Take care not to twist or damage distributor
tubes during this process,
4, Remove and discard RFC bullet and Teflon washer,
5. Remove and discard cap from the equalizer line port
on the vapor line. Check for valve core in port fitting
and if installed, remove from port.
6. Install one of the provided Teflon washers around the
stubbed end of the CTXV,
7. Attach the stubbed end of the kit valve to the distributor
assembly.
8. Place the remaining Teflon washer around the other
end of the CTXV.
9. Attach the liquid line to the CTXV.
10. Attach the sensing bulb of the CTXV in the proper
orientation to the vapor line using the clamp an screws
provided with the CTXV,
11. Connect the equalizer line from the CTXV to the
equalizer vapor port on the vapor line.
12. To prevent against any possibility of water damage,
properly insulate all parts of the CTXV assemble that
may sweat due to temperature differences between
the valve and its surrounding ambient temperatures.
13. The expansion/check valve can be installed internally
in coil blowers, or external or internal to indoor coil only
applications,
Expansion valves equipped with Chatleff type fittings are
available from Lennox, Refer to the Engineering
Handbook for CTXV kits for use with specific match-ups.
Table 4. Indoor CTXV Kits
Model Kit Number
XP15-024 and -036 49L24
XP15-048 and -060 91M02
AIMPORTANT
If the indoor unit being installed came with a fixed orifice
type metering device, remove that orifice and install the
CTXV as illustrated in figure 23.
Re-install both of the outdoor unit's service port cores
(liquid and vapor) as illustrated in figure 24.
O TOOO .
LIQUID AND VAPOR
SERVICE VALVES DO NOT INSTALL
CAPS AT THIS TIME
INSTALL SERVICE
PORT CORES
Figure 24. Typical Service Valve Port Core
Installation
WARNING
AIMPORTANT
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
vapor combine with refrigerant to produce substances that
corrode copper piping and compressor parts.
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 and 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).
NOTE - 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 sure 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,
6. When the absolute pressure reaches 23,000 microns
(29.01 inches of mercury), close the manifold gauge
505328M 04_8
Page 14

valves,turnoffthevacuumpumpanddisconnectthe
manifoldgaugecenterporthosefromvacuumpump.
Attachthemanifoldcenterporthosetoadrynitrogen
cylinderwithpressureregulatorsetto150psig(1034
kPa)andpurgethehose.Openthemanifoldgauge
valvestobreakthevacuuminthelinesetandindoor
unit.Closethemanifoldgaugevalves,
7, Shutoff the drynitrogencylinderandremovethe
manifoldgaugehosefromthe cylinder.Openthe
manifoldgaugevalvestoreleasethedrynitrogenfrom
thelinesetandindoorunit,
8, Reconnectthemanifoldgaugetothevacuumpump,
turnthepumpon,andcontinuetoevacuatethelineset
andindoorunituntiltheabsolutepressuredoesnot
riseabove500microns(29.9inchesofmercury)within
a20-minuteperiodaftershuttingoffthevacuumpump
andclosingthemanifoldgaugevalves.
9,Whentheabsolutepressurerequirementabovehas
beenmet,disconnectthe manifoldhosefromthe
vacuumpumpandconnectittoanuprightcylinderof
HFC-410Arefrigerant,Openthemanifoldgaugevalve
1to2psiginordertoreleasethevacuuminthelineset
andindoorunit,
10,Close manifoldgauge valvesand shut off the
HFC-410Acylinderandremovethemanifoldgauge
set,
SERVICINGUNITSDELIVEREDVOIDOFCHARGE
Ifthesystemisvoidofrefrigerant,cleanthesystemusing
theproceduredescribedbelow,
1, Usenitrogentopressurizethesystemandcheckfor
leaks,Repairallleaks,
2, Evacuatethe systemto removeas muchof the
moistureaspossible,
3, Usenitrogentobreakthevacuumandinstalla new
filterdrierinthesystem.
4, Evacuatethe system again. Then, weigh the
appropriateamountofHFC-410Arefrigerantaslisted
onunitnameplateintothesystem.
5, Monitorthe systemto determinethe amountof
moistureremainingintheoil.Itmaybenecessaryto
replacethefilterdrierseveraltimesto achievethe
requireddrynesslevel.If systemdrynessis not
verified,thecompressorwillfail in thefuture.
IMPORTANT
1. Rotate fan to check for frozen bearings or binding.
2, Inspect all factory- and field-installed wiring for loose
connections.
3, After evacuation is complete, open the liquid line and
vapor line service valves to release the refrigerant
charge (contained in outdoor unit) into the system,
4, Replace the stem caps and tighten as specified in
Operating Service Valves on page 3.
5, Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit's
nameplate. If not, do not start the equipment until you
have consulted with the power company and the
voltage condition has been corrected,
6, Set the thermostat for a cooling demand. Turn on
power to the indoor indoor unit and close the outdoor
unit disconnect switch to start the unit.
7, Recheck voltage while the unit is running. Power must
be within range shown on the nameplate,
8, Check system for sufficient refrigerant by using the
procedures listed under Testing and Charging
System,
TESTING AND CHARGING SYSTEM
This system uses HFC-410A refrigerant which operates at
much higher pressures than HCFC-22. The pre-installed
liquid line filter drier is approved for use with HFC-410A
only, Do not replace liquid line filter drier with components
designed for use with HCFC-22,
NOTE - This unit is NOT approved for use with coils which
use capillary tubes as a refrigerant metering device,
SETTING UP TO CHECK CHARGE
1. Close manifold gauge set valves. Connect the center
manifold hose to an upright cylinder of HFC-410A.
2. Connect the manifold gauge set to the unit's service
ports as illustrated in figure 25,
•low pressure gauge to vapor service port
• high pressure gauge to liquid service port
COOLING MODE INDOOR AIRFLOW CHECK
Check airflow using the Delta-T (DT) process as illustrated
in figure 26 on page 16.
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)
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:
Additional charge
Amount Adjust amount for specified per
specified variation in indoor unit
on line set length match-up Total
nameplate (table in figure 27) (tables 6 through 11) charge
+ + =
Page15
XP15 SERIES

CHECK
EXPANSIONVALVE
LOW HIGH [
PRESSUREPRESSURE
_:[tGAUGEMANIFO%D1]:_
HFC-410 LINEI
ADRUM VALVE COMPRESSOF
J2
DISTRIBUTOR
DRIER OUTDOOR
CO,L
MUFFLER
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 UNIT
REVERSING VALVE
VAPOR LINE
VALVE
CHECK EXPANSION VALVE --
NOTE -ARROWS INDICATE
DIRECTION OF REFRIGERANT FLOW
INDOOR UNIT
INDOOR
COIL
Figure 25. XP15 Cooling Cycle (Showing Gauge Manifold Connections)
Temp. l
of air I 80 24
I
entering,_ I 78 23
indoor _ I== 22
coil °F _'?1tu
"- 17421
I
72 20
70 19
Wet-bulb °F 57
DT
24 24 23 23 22 22 22 20 19 18 17 16 15
23 23 22 22 21 21 20 19 18 17 16 15 14
22 22 21 21 20 19 19 18 17 16 15 14 13
21 21 20 19 19 18 17 16 16 15 14 13 12
20 19 18 17 17 161L55_15 14 13 12 11 10
19 18 18 17 17 16 15 15 14 13 12 11 10
58 59 60 61 62 63 64 65 66 67 68 69 70 I
n$
19°
iNDOOR WET
All temperatures are COiL BULB
expressed in °F 6
DRY
BULB
1. Determine the desired DT--Measure 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).
2. Find temperature drop across coil--Measure the coil's dry
bulb entering and leaving air temperatures (A and C). Tem-
perature Drop Formula: (TDrop) = A minus C.
3. Determine if fan needs adjustment--If the difference between
the measured TDrop and the desired DT (TDrop-DT) is within
+_3°, no adjustment is needed. See examples: Assume DT =
15 and A temp. = 72 °, these C temperatures would necessi-
LEILI9 _LaL_d EI(3LIUII_:
C°TDrop- DT =°F ACTION
53°19 - 15 = 4 Increase the airflow
58°14 - 15 = -1 (within +3° range) no change
62°10 - 15 = -5 Decrease the airflow
4. Adjust the fan speed--See 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
+_30.
Figure 26. Checking Indoor Airflow over Evaporator Coil using Delta-T Chart
WEIGH
Refrigerant Charge per Line Set Length
Liquid Line Ounces per 5 feet (g per 1.5 m)
Set Diameter adjust from 15 feet (4.6 m) line set*
3t8" (9.5 mm) 3 ounce per 5' (85 g per 1.5 m)
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.
L_NNOX
HIHIIIJI|I[I
@:L,
1. Check Liquid and suction line pressures
2. Compare unit pressures with table 5,
Normal Operating Pressures,
3. Conduct leak check; evacuate as
previously outlined.
4. Weigh in the unit nameplate charge plus
any charge required for line set differences
over feet,
This nameplate is for illustration purposes
only. Go to actual nameplate on outdoor
unit for charge information.
Figure 27. Using Weigh In Method
505328M 04/08
Page 16

8UBCOOLING 1
USE COOLING
MODE
60°F (15 °) --
USE HEATING
MODE
2
3
4
%
SATo
LIQo -
SCo =
Check the airflow as illustrated in figure 26 to be sure the indoor airflow is as
required. (Make any air flow adjustments before continuing with the following
procedure.)
Measure outdoor ambient temperature; determine whether to use cooling mode
or heating mode to check charge.
Connect gauge set.
Check Liquid and Vapor line pressures. Compare pressures with Normal
Operating Pressures table 5, (The reference table is a general guide. Expect
minor pressure variations. Significant differences may mean improper charge or
other system problem. )
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 68°F (20°C).
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 77°F (25°C). When pressures have
stabilized, continue with step 6.
6 Read the liquid line temperature; record in the LIQ° space.
7 Read the liquid line pressure; then find its corresponding temperature in the
temperature/pressure chart listed in table 12 and record it in the SAT° space.
8 Subtract LIQ° temp. from SAT° temp. to determine subcooling; record it in SC° space.
9 Compare SC° 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 tables 6 through 11 for the applicable unit,
remove refrigerant; if less than shown, add refrigerant.
11 If refrigerant is added or removed, repeat steps 6 through 10 to verify charge.
Figure 28. Using Subcooling Method
Table 5. Normal Operating Pressure - Liquid +10 and Vapor +5 PSIG*
IMPORTANT
|lliiliTo]ilv/_-I IP.|l[[o]i[-.lllilllii['4-"[_]l)i] I[:t-$"]!ll':-.t-lliiL.]Iv|i[_ :--,).-4i[:[_rlrl_irilrlll_l_-41[-4i[_-4.111i!11i1,¢ _-"ll .F'[|[o]i[..'!ll_-'l[i-']'_ilil i,_.]i|l[ill_l[q 1['4i[_:t-11
""""'"" il"""T II
XP15-024 XP15-030 XP15-036 XP15-042 XP15-048 XP15-060
..aidIvo o. Ivo o. Ivo o...aidIVo o. IVo o. IVo o.
HEATINGOPERATION
20 (-7.0) 315 65 308 62 284 59 293 58 312 62 349 61
30 (-1.0) 340 81 317 76 296 71 312 71 332 76 375 74
40 (4.4) 364 97 339 89 313 87 321 82 353 92 384 88
50 (10) 394 115 359 107 326 106 337 103 374 110 406 107
COOLING OPERATION
65 (18.3) 237 141 250 141 260 139 265 141 242 139 255 136
75 (23.9) 274 143 292 143 298 141 309 144 279 140 297 138
85 (29.4) 319 145 336 145 344 143 360 147 322 142 343 140
95 (35.0) 364 147 385 147 393 145 408 149 370 144 392 142
105 (40.6) 415 149 438 148 446 148 462 151 423 147 447 145
115 (49.0) 469 152 497 151 506 150 522 154 479 149 510 148
*These are most-popular-match-up pressure& Indoor match up, indoor air quality, and indoor load cause pressures to vary.
**Temperature of the air entering the outdoor coi!.
Page 17
XP15 SERIES

Table 6. XP15-024
Target *Add
Subcooling charge
INDOOR MATCHUPS Heat Cool
(+5OF) (+1OF) Ib oz
CH23-51 14 6 0 14
CBX27UH-030-230 13 6 2 4
CB3OU-31 15 5 O 1
CBX32M-030 15 5 O 1
CBX32M-036 13 6 2 4
CBX32MV-024/030 15 5 O O
CBX32MV-036 13 6 2 4
CH33-42 14 6 O 14
CR33-48 38 7 3 1
CX34-31 15 5 0 1
CX34-38 SN# 6007 and after 6 6 1 15
CX34-38 before SN# 6007 13 6 1 15
Table 7. XP15-030
Target *Add
Subcooling charge
INDOOR MATCHUPS Heat Cool
(+5OF) (+1OF) Ib oz
CH23-51 13 5 0 4
CBX27UH-030-230 12 5 0 10
CBX27UH-036-230 13 5 0 8
CB30U-31 14 5 0 0
CB30U-41/46 12 5 0 10
CBX32M-030 14 5 0 0
CBX32M-036 12 5 0 10
CBX32MV-024/030 14 5 0 0
CBX32MV-036 12 5 0 10
CR33-48 31 4 0 13
CX34-38 SN# 6007 and after 5 5 0 8
CX34-38 before SN# 6007 13 5 0 8
CX34-43 9 5 1 4
CX34-49 6 5 2 0
CX34-50/60C 9 5 1 4
Table 8. XP15-036
Target *Add
Subcooling charge
INDOOR MATCHUPS Heat Cool
(+5OF) (+1OF) Ib oz
CBX27UH-036-230 13 4 0 3
CBX27UH-042-230 5 5 O 12
CB3OU-41/46 13 4 O 3
CB3OU-51 5 5 O 12
CBX32M-042 13 4 O 3
CBX32M-048 5 5 O 12
CBX32MV-036 13 4 O 3
CBX32MV-048 5 5 O 12
C33-44C 13 4 O 3
CH33-42 14 4 O 1
CH33-44/48B 9 4 O 7
CH33-48C 7 5 O 7
CH33-49C 5 5 O 12
CH33-62D 5 7 O 14
CR33-48C 37 4 O 5
CR33-50/60 32 5 O 10
CX34-31 15 4 O O
CX34-38 SN# 6007 and after 4 4 O 3
CX34-38 before SN# 6007 13 4 O 3
CX34-43 7 5 O 7
CX34-44/48 13 4 O 3
CX34-49 6 5 O 11
Table 9. XP15-042
Target *Add
Subcooling charge
INDOOR MATCHUPS Heat Cool
(+5OF) (+1OF) Ib oz
CH33-62D 7 7 0 13
CBX27UH-042-230 9 4 O 11
CBX27UH-048-230 9 4 O 11
CB3OU-51*P 9 4 O 11
CBX32M-048 9 4 O 11
CBX32MV-048 9 4 O 11
C33-44C 13 4 O O
CH33-44/48B, -48C 12 4 O 5
CH33-49C 9 4 O 12
CR33-48 35 3 O 2
CX34-38 SN# 6007 and after 4 4 O O
CX34-38 before SN# 6007 13 4 O O
CX34-43 12 4 O 5
CX34-44/48B 13 4 O O
CX34-50/60C 12 4 O 5
Table 10. XP1 _-048Target *Add
Subcooling charge
INDOOR MATCHUPS Heat Cool
(+5OF) (+1OF) Ib oz
CH23-68 21 4 0 12
CBX27UH-048-230 22 4 O 3
CBX27UH-060-230 12 4 O 11
CB3OU-51*P 22 4 O 3
CB3OU-65*P 12 4 O 3
CBX32M-048 22 4 O 3
CBX32M-060 12 4 O 3
CBX32MV-048 22 4 O 3
CBX32MV-060 12 4 O 3
CBX32MV-068 12 4 O 7
CH33-62D 12 4 O 8
CX34-49C 13 4 O 2
CX34-6OD 14 4 O O
CX34-62D 12 4 O 5
Table 11. XP15-060
Target *Add
Subcooling charge
INDOOR MATCHUPS Heat Cool
(+5OF) (+IOF) Ib oz
CH23-68 28 6 0 0
CBX27UH-060-230 17 6 O O
CB3OU-51*R -65"P 19 6 O 2
CBX32M-O48*R -O6O*P 19 6 O 2
CBX32MV-O48*R -O6O*P 19 6 O 2
CH33-62D 18 6 O 1
*Amount of charge required in addition to charge shown on unit
nameplate. (Remember to consider lineset length difference.)
505328M 04_8
Page 18

Table 12. HFC-410A Temperature (°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
INSTALLING SERVICE VALVE CAPS
Disconnect gauge set and re-install all service valve caps.
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 the
unit 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), The system
should be left in the emergency heat mode at least six
hours to allow the crankcase heater sufficient time to
prevent compressor slugging.
HIGH-PRESSURE SWITCH
XP15 units are equipped with a high-pressure switch that
is located in the liquid line to the compressor. The normally
closed SPST auto-reset switch opens at 590 psi,
LOW-PRESSURE SWITCH
XP15 units are equipped with a low-pressure switch that is
located in the vapor line to the compressor. The normally
closed SPST auto-reset switch opens at 25 psi and closes
at 55 psi,
SINGLE-SPEED CONDENSER FAN MOTOR
The XP15 is equipped with a single-speed condenser fan
motor. The compressor contactor and defrost control
board (DCB) controls the operation of the motor,
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 like design and capacity,
Replacement filter driers must be suitable for use with
HFC-410A refrigerant,
OUTDOOR UNIT INSTALL CAPS
SERVICE VALVE _ _/
Figure 29. Installing Service Valve Port Caps
The LSOM detects the most common fault conditions in
the system. When an abnormal condition is detected, the
LSOM communicates the specific condition through its
ALERT and TRIP lights, The LSOM is capable of detecting
both mechanical and electrical system problems. See
figure 30 for LSOM LED locations.
The outdoor unit and indoor blower cycle on demand from
the room thermostat, When the thermostat blower switch
is in the ON position, the indoor blower operates
continuously.
THERMOSTAT OPERATION
Some indoor thermostats incorporate isolating contacts
and an emergency heat function (which includes an amber
indicating light). The thermostat is not included with the
unit and must be purchased separately,
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POWER LED .....
TRIP LED
ALERT LED
Figure 30. LSOM
XP15 SERIES

Table 13. LSOM LED Troubleshooting Codes
Status LED Status LED Status LED Troubleshooting Information
Condition Description
Green Power LED ON LSOM has power
Green Power LED OFF LSOM not powering up
System and compressor
check out OK
Thermostat demand signal
Y1 is present, but
compressor not running
NO TE -During 5-minute
delay in LSOM the red trip
LED will be on.
Red Trip LED ON
Red Trip and Yellow
Alert LEDs Flashing Simultaneous flashing,
Yellow Alert Flash
Code 1"
Yellow Alert Flash
Code 2*
Yellow Alert Flash
Code 3*
Yellow Alert Flash
Code 4*
Long Run Time - Compres-
sor is running extremely
long run cycles
System Pressure Trip -
Discharge or vapor pressure
out of limits or compressor
overloaded
Short Cycling -Compres-
sor is running only briefly
Locked Rotor
Open Circuit
Yellow Alert Flash
Code 5*
Yellow Alert Flash Open Start Circuit -Cur-
Code 6* rent only in run circuit
Yellow Alert Flash Open Run Circuit - Current
Code 7* only in start circuit
Yellow Alert Flash Welded Contactor -
Code 8* Compressor always runs
Yellow Alert Flash Low Voltage - Control cir-
Code 9* cuit <17VAC
24VAC control power is present at the LSOM terminal.
Determine/verify that both R and C LSOM terminals are connected and voltage is present
at both terminals.
1Verify Y terminal is connected to 24VAC at contactor coil.
2Verify voltage at contactor coil falls below 0.5VAC when off.
3Verify 24VAC is present across Y and C when thermostat demand signal is present; if not
present, R and C wires are reversed.
1 Compressor protector is open.
2 Outdoor unit power disconnect is open.
3 Compressor circuit breaker or fuse(s) is open.
4 Broken wire or connector is not making contact.
5 Low pressure switch open if present in the system.
6 Compressor contactor has failed to close.
Indicates that the control circuit voltage is too low for operation.
1 LOW refrigerant charge.
2 Evaporator blower is not running.
3 Evaporator coil is frozen.
4 Faulty metering device.
5 Condenser coil is dirty.
6 Liquid line restriction (filter drier blocked if present).
7 Thermostat is malfunctioning.
1 Check high head pressure or discharge line sensor.
2 Condenser coil poor air circulation (dirty, blocked, damaged).
3 Condenser fan is not running.
4 Return air duct has substantial leakage.
5 If low pressure switch is present, see Flash Code 1 information.
1 Thermostat demand signal is intermittent.
2 Time delay relay or DCB is defective.
3 If high pressure switch is present, see Flash Code 2 information.
4 If low pressure switch is present, see Flash Code 2 information.
1 Run capacitor has failed.
2 Low line voltage (contact utility if voltage at disconnect is low).
3 Excessive liquid refrigerant in the compressor.
4 Compressor bearings are seized.
1 Outdoor unit power disconnect is open.
2 Unit circuit breaker or fuse(s) is open.
3 Unit contactor has failed to close.
4 High pressure switch is open and requires manual reset.
5 Open circuit in compressor supply wiring or connections.
6 Unusually long compressor protector reset time due to extreme ambient temperature.
7 Compressor windings are damaged.
1 Run capacitor has failed.
2 Open circuit in compressor start wiring or connections.
3 Compressor start winding is damaged.
1 Open circuit in compressor start wiring or connec_ons.
2 Compressor start winding is damaged.
1 Compressor contactor failed to open.
2 Thermostat demand signal not connected to LSOM.
1 Control circuit transformer is overloaded.
2 Low line voltage (contact utility if voltage at disconnect is low).
*Flash code number corresponds to a number of LED flashes, followed by a pause, and then repeated. Reset ALER Tflash code by removing 24VAC power
from LSOM; last code will display for 1minute after LSOM is powered on.
Note: If the unit is equipped with a two-stagged compressor, upon Y2 signal detection and after five seconds, the LSOM will send 24 VAC to the solenoid.
Once the solenoid is fully energized, the LSOM reduces voltage to between 4 to 18 VDC .Every 15minutes the solenoid voltage will be increase to 24 volts
for a few seconds to ensure solenoid valve is engaged until Y2 signal is no longer present.
505328M 04_8
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