Lennox Elite XP13 Units, Elite XP13-018, Elite XP13-024, Elite XP13-030, Elite XP13-036 Installation Instructions Manual

INSTALLATION

2009 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
licensed professional installer (or equivalent) or a
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.

INSTRUCTIONS

Elite® Series XP13 Units

HEAT PUMPS

506270−01
05/09
Supersedes 01/09

Table of Contents

Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . .

XP13 Heat Pumps 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Information 3. . . . . . . . . . . . . . . . . . . . . . . . . . .

Recovering Refrigerant from Existing System 5. . . . .

Removing Existing Outdoor Unit 6. . . . . . . . . . . . . . . . .

Positioning New Outdoor Unit 6. . . . . . . . . . . . . . . . . . .

Removing and Installing Panels 7. . . . . . . . . . . . . . . . .

New or Replacement Line Set 9. . . . . . . . . . . . . . . . . . .

Brazing Connections 10. . . . . . . . . . . . . . . . . . . . . . . . . . .

Removing Indoor Unit Metering Device 11. . . . . . . . . . .

Flushing the System 12. . . . . . . . . . . . . . . . . . . . . . . . . . .

Installing New Indoor Unit Metering Device 13. . . . . . . .

Testing for Leaks 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Evacuating the System 15. . . . . . . . . . . . . . . . . . . . . . . . .

Servicing Unit Delivered Void of Charge 16. . . . . . . . . . .

Electrical Connections 17. . . . . . . . . . . . . . . . . . . . . . . . .

Start−Up and Charging Procedures 18. . . . . . . . . . . . . . .

System Operation 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Defrost System 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Homeowner Information 23. . . . . . . . . . . . . . . . . . . . . . . .

Start−Up and Performance Checklist 26. . . . . . . . . . . . .

Shipping and Packing List

Litho U.S.A.

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.

05/09 506270−01

*2P0509* *P506270-01*

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 XP13 outdoor unit

XP13 Heat Pumps

The XP13 Heat Pumps, which will also be referred to in this
instruction as the outdoor unit, uses HFC−410A
refrigerant. This outdoor unit must be installed with a
matching indoor unit and line set as outlined in the Lennox
XP13 Engineering Handbook.

This outdoor unit is designed for use in systems that use
check thermal expansion valve (CTXV) refrigerant
metering devices.

Page 1

Unit Dimensions − Inches (mm) and Parts Arrangement

RUN

CAPACITOR

DEFROST

BOARD

CONTACTOR

REVERSING

VALV E

FILTER DRIER/

LIQUID LINE

CONNECTIONS

XP13 PARTS ARRANGEMENT

TOP VIEW

DISCHARGE AIR

SUCTION LINE
CONNECTION

LIQUID LINE
CONNECTION

C

LIQUID LINE
CONNECTION

ELECTRICAL
INLETS

VAPOR LINE
CONNECTION

OUTDOOR FAN

COMPRESSOR

HIGH PRESSURE
SWITCH

VAPOR LINE

VAPOR VALVE AND
GAUGE PORT/SUCTION
LINE CONNECTIONS

B

A

2 (51)

08)

4−3/4
(121)

9−1/2
(241)

8−1/4
(210)

UNIT SUPPORT FEET

13−7/8

(352)

7−3/4
(197)

3−1/4

(83)

1 (25)

SIDE VIEW

27−1/8

(689)

XP13 BASE WITH ELONGATED LEGS

4−1/4(1

SIDE VIEW

UNIT SUPPORT

FEET

8−1/2
(216)

8−3/4
(222)

5−1/2
(140)

13−1/2

(343)

XP13−018, 024, 030 AND 036 BASE SECTION

XP13 A B C

−018

−024

−030

−036

−042

−048

−060

31 (787) 27 (686) 28 (711)

31 (787) 27 (686) 28 (711)

31 (787) 27 (686) 28 (711)

35 (889) 27 (686) 28 (711)

35 (889) 30−1/2 (775) 35 (889)

35 (889) 30−1/2 (775) 35 (889)

45 (1143) 30−1/2 (775) 35 (889)

20−5/8

K

(524)

4−1/2

J

(114)

3−5/8

(92)

506270−01 05/09

Page 2

WARNING

This product and/or the indoor unit it is matched
with may contain fiberglass wool.

Disturbing the insulation during installation,
maintenance, or repair will expose you to fiberglass
wool dust. Breathing this may cause lung cancer.
(Fiberglass wool is known 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 shown below, or contact
your supervisor.

Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900

General Information

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.

1/12 TURN

12

1

2

3

4

7

5

6

9

10

8

11

1/6 TURN

12

1

2

3

4

7

5

6

11

10

9

8

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
the fasteners are appropriately tightened. Table 1 shows
torque values for 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

USING MANIFOLD GAUGE SETS

When checking the system charge, only use a manifold
gauge set that features low loss anti−blow back fittings.
See figure 2 for a typical manifold gauge connection setup.

Manifold gauge sets used with HFC−410A refrigerant
systems 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.

OPERATING SERVICE VALVES

The liquid and vapor line service valves 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.

Figure 1. Cap Tightening Distances

IMPORTANT

To prevent stripping of the various caps used, the
appropriately sized wrench should be used and
fitted snugly over the cap before tightening.

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 with an appropriately sized
wrench.

2. Connect gauge to the service port.

3. When testing is completed, replace service port cap and
tighten as follows:

 With Torque Wrench: Finger tighten and then

tighten per table 1.

 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 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 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.

3. Replace the stem cap and tighten as follows:

 With Torque Wrench: Tighten finger tight and then

tighten per table 1.

 Without Torque Wrench: Finger tighten and use an

appropriately sized wrenched to turn an additional
1/12 turn clockwise as illustrated in figure 1.

Page 3

XP13 SERIES

CHECK

EXPANSION VALVE

LOW

PRESSURE

GAUGE MANIFOLD

PRESSURE

TO
HFC−410
A DRUM

HIGH

LIQUID
LINE
VALV E

BI−FLOW
FILTER /
DRIER

MUFFLER

LIQUID

SERVICE

PORT

DISTRIBUTOR

OUTDOOR

COIL

COMPRESSOR

HEAT PUMP

REVERSING VALVE

VAPOR

SERVICE

PORT

VAPOR
LINE
VALV E

NOTE − ARROWS INDICATE DIRECTION
OF REFRIGERANT FLOW.

INDOOR UNIT

Figure 2. Typical Manifold Gauge Connection Setup

SERVICE PORT

CORE

VALVE STEM

FRONT-SEATED

TO INDOOR

UNIT

TO OUTDOOR UNIT

SERVICE PORT

CAP

SERVICE PORT

(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE

STEM CAP

CLOSED TO BOTH INDOOR

AND OUTDOOR UNITS

Figure 3. Angle−Type Service Valve

(Font−Seated Closed)

NOTE − A label with specific torque requirements may be
affixed to the stem cap. If the label is present, use the
specified torque.

CHECK EXPANSION VALVE

INDOOR

COIL

NOTE− To prevent stripping of the cap, the wrench should
be appropriately sized and fit snugly over the cap before
tightening the cap.

To Access Ball−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 with an appropriately sized
wrench.

2. Connect gauge to the service port.

3. When testing is completed, replace service port cap and
tighten as follows:

 With Torque Wrench: Finger tighten and then

tighten per table 1.

 Without Torque Wrench: Finger tighten and use an

appropriately sized wrench to turn an additional
1/6 turn clockwise as illustrated in figure 1.

OPEN TO LINE SET WHEN VALVE IS CLOSED,
TO BOTH LINE SET AND UNIT WHEN VALVE IS
OPEN.

TO INDOOR UNIT

SERVICE PORT CAP

SERVICE PORT

CORE

OPEN TO BOTH

INDOOR AND

OUTDOOR UNITS

TO INDOOR

UNIT

TO OUTDOOR UNIT

STEM CAP

SERVICE PORT

(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE

Figure 4. Angle−Type Service Valve

(Back−Seated Opened)

506270−01 05/09

Page 4

TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.

TO CLOSE ROTATE STEM
CLOCKWISE 90°.

SERVICE PORT

SERVICE PORT

CORE

SERVICE PORT CAP

TO OUTDOOR UNIT

Figure 5. Ball−Type Service Valve

BALL (SHOWN
CLOSED)

VALV E
STEM

STEM CAP

To Open and Close Ball−Type Service Valve:

A valve stem cap protects the valve stem from
contamination and assures a leak−free seal.

1. Remove stem cap with an appropriately sized wrench.

2. Use an appropriately sized wrenched to open. To open
valve, roate 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.

 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 torque.

NOTE − Use recovery machine instructions for specific
setup requirements.

METHOD 2:

Use this method if the existing outdoor unit is equipped
with manual shut−off valves, and plan on using new
HCFC−22 refrigerant to flush the system.

IMPORTANT: Some system configurations may contain
higher than normal refrigerant charge due to either large
internal coil volumes, and/or long line sets. The following
conditions may cause the compressor to stop functioning:

The following devices could prevent full system charge
recovery into the outdoor unit:

 Outdoor unit’s high or low−pressure switches (if

applicable) when tripped can cycled the compressor

OFF.

Recovering Refrigerant from Existing
System

Remove existing HCFC−22 refrigerant using one of the
following procedures:

METHOD 1:

If the existing outdoor unit is not equipped with shut−off
valves, or if the unit is not operational and you plan to use
the existing HCFC−22 to flush the system.

NOTE − Use recovery machine instructions for specific
setup requirements.

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 recovery 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.

RECOVERY MACHINE

MANIFOLD GAUGES

 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 one of the above system conditions, shut
off the suction 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.

Perform the following task:

1. Start the existing HCFC−22 system in the cooling
mode and close the liquid line valve.

2. Pump as much of the existing HCFC−22 refrigerant
with the compressor back into the outdoor unit until
you have reached the limitations of the outdoor
system. Turn the outdoor unit main power OFF and
use a recovery machine to remove the remaining
refrigerant in the system.

CLEAN RECOVERY
CYLINDER

Figure 6. Typical Refrigerant Recovery

(Method 1)

OUTDOOR UNIT

NOTE − It may be necessary to bypass the low pressure
switches if equipped to ensure complete refrigerant
evacuation.

3. When the low side system pressures reach 0 psig,
close the suction line valve.

4. Check gauges after shutdown to confirm that the
valves are not allowing refrigerant to flow back into the
low side of the system.

Page 5

XP13 SERIES

Removing Existing Outdoor Unit

Perform the following task at the existing outdoor unit:

 Disconnect line set at the service valves.
 Disconnect electrical service at the disconnect switch.
 Remove old outdoor unit.

Positioning New Outdoor Unit

CAUTION

In order to avoid injury, take proper precaution when
lifting heavy objects.

See Unit Dimensions on page 3 for sizing mounting slab,
platforms or supports. Refer to figure 7 for mandatory
installation clearance requirements.

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 8.

INSTALL UNIT AWAY

FROM WINDOWS

*

*

* SEE NOTES BELOW THIS FIGURE FOR FURTHER DETAILS.

*

CONTROL PANEL
ACCESS LOCATION

*

Figure 7. Installation Clearances

NOTES:

 Service clearance of 30 in. (762 mm) must be

maintained on one of the sides adjacent to the control
box.

 Clearance to one of the other three sides must be 36

in. (914 mm)

.

 Clearance to one of the remaining two sides may be

12 in. (305 mm) and the final side may be 6 in. (152

.

mm)

 48 in. (1219 mm) clearance required on top of unit.
 A clearance of 24 in. (610 mm) must be maintained

between two units.

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

TWO 90° ELBOWS INSTALLED

IN LINE SET WILL REDUCE

LINE SET VIBRATION.

Figure 8. Outside Unit Placement

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 9.

NOTE − If necessary for stability, anchor unit to slab as
described in Stabilizing Unit on Uneven Surfaces on page

7.

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

MOUNTING
SLAB

GROUND LEVEL

Figure 9. Slab Mounting at Ground Level

506270−01 05/09

Page 6

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 10.

BASE

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.

BASE

2" (50.8MM) SCH 40
FEMALE THREADED
ADAPTER

LEG DETAIL

LEG DETAIL

4" (101.6MM)
SCH 40 PIPING

Figure 10. Elevated Slab Mounting using Feet

Extenders (Small Base Units)

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.

ELEVATING THE UNIT (LARGER−BASE UNITS)

Unlike the small−base units which use round support feet,
the larger−base units are outfitted with elongated support
feet as illustrated in figure 11 which uses a similar method
for elevating the unit.

If additional elevation is necessary, raise the unit by
extending the length of the unit support feet. This may be
achieved by using a 2" SCH 40 female threaded adapter.

The specified coupling will fit snuggly into the recessed
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.

Figure 11. Elevated Slab Mounting using Feet

Extenders (Larger Base Units)

ROOF MOUNTING

Install unit at a minimum of four inches above the surface
of the roof. Care must be taken to ensure weight of unit is
properly distributed over roof joists and rafters. Either
redwood, steel supports, or roofed in equipment platform is
recommended.

Removing and Installing Panels

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.

REMOVING PANELS

Remove the louvered panels as follows:

1. Remove two screws, allowing the panel to swing open
slightly as illustrated in figure 12.

NOTE − Hold the panel firmly throughout this procedure

2. Rotate bottom corner of panel away from hinge 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.

Page 7

XP13 SERIES

INSTALLING PANEL

Install the louvered panels as follows:

1. 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.

2. With 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.

3. Rotate panel to vertical to fully engage all tabs.

4. Holding the panel’s hinged side firmly in place, close
the right−hand side of the panel, aligning the screw
holes.

5. When panel is correctly positioned and aligned, insert
the screws and tighten.

PANEL SHOWN SLIGHTLY ROTATED TO ALLOW TOP TAB TO EXIT (OR ENTER)
TOP SLOT FOR REMOVING (OR INSTALLING) PANEL.

SCREW

LIP

HOLES

ANGLE MAY BE TOO
EXTREME

PREFERRED ANGLE
FOR INSTALLATION

MAINTAIN MINIMUM PANEL
ANGLE (AS CLOSE TO PARALLEL
WITH THE UNIT AS POSSIBLE)
WHILE INSTALLING PANEL.

HOLD DOOR FIRMLY TO THE HINGED

SIDE TO MAINTAIN

FULLY−ENGAGED TABS

Figure 13. Removing/Installing Louvered Panels

(Detail D)

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.

With unit positioned at installation site, remove two side
louvered panels to expose the unit base pan. Install the
brackets as illustrated in figure 14 using conventional

practices; replace the panels after installation is complete.

DETAIL A

DETAIL B

ROTATE IN THIS DIRECTION;

THEN DOWN TO REMOVE

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

Detail C

Figure 12. Removing/Installing Louvered Panels

(Details A, B and C)

Slab Side Mounting

#10 1/2" LONG SELF−

DRILLING SHEET

METAL SCREWS

STABILIZING

BRACKET (18 GAUGE

METAL − 2" WIDTH;

HEIGHT AS REQ’D)

#10 1−1/4" LONG

HEX HD SCREW

AND FLATWASHER

CONCRETE SLAB − USE PLASTIC
PLASTIC ANCHOR (HOLE DRILL
1/4")PLASTIC SLAB − NO PLASTIC
ANCHOR (HOLE DRILL 1/8")

Deck Top
Mounting

STABILIZING BRACKET
(18 GAUGE METAL − 2"
WIDTH; HEIGHT AS
REQ’D); BEND TO FORM
RIGHT ANGLE

FOR EXTRA

ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY,
2 BRACKETS PER SIDE, 2" FROM EACH CORNER.

STABILITY

MINIMUM 1
PER SIDE

Figure 14. Installing Stabilizer Brackets

COIL

BASE PAN

CORNER POST

506270−01 05/09

Page 8

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 an uneven surface.

New or Replacement Line Set

This section provides information on installation or
replacement of existing line set. If line set are not being
installed then proceed to Brazing Connections on page 10.

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. Also, consider the following when
placing and installing a high−efficiency air conditioner.

REFRIGERANT LINE SET

Field refrigerant piping consists of liquid and suction lines
from the outdoor unit (braze connections) to the indoor unit
coil (flare or sweat connections). Use Lennox L15 (sweat,
non−flare) series line set, or use field−fabricated refrigerant
lines as listed in table 2.

Table 2. Refrigerant Line Set

Field Connections Recommended Line Set

Model

−018

−024

−030

−036

−042

−048

−060

NOTE − 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 (XP13) and size of unit (e.g. −060).

Liquid
Line

3/8".
(10 mm)

3/8".
(10 mm)

3/8".
(10 mm)

Suction
Line

3/4"
(19 mm)

7/8"
(22 mm)

1−1/8".
(29 mm)

Liquid
Line

3/8"
(10 mm)

3/8"
(10 mm)

3/8"
(10 mm)

Suction
Line

3/4"
(19 mm)

7/8"
(22 mm)

1−1/8"
(29 mm)

L15 Line Set

L15−41
15 ft. − 50 ft.
(4.6 m − 15 m)

L15−65
15 ft. − 50 ft.
(4.6 m − 15 m)

Field
Fabricated

 Line set diameters for the unit being installed as listed

in table 2 and total length of installation.

 Number of elbows and if there is a rise or drop of the

piping.

MATCHING WITH NEW OR EXISTING INDOOR COIL
AND LINE SET

The RFC1−metering line consisted of a small bore copper
line that ran from condenser to evaporator coil. Refrigerant
was metered into the evaporator by utilizing
temperature/pressure evaporation effects on refrigerant in
the small RFC line. The length and bore of the RFC line
corresponded to the size of cooling unit.

If the XP13 is being used with either a new or existing
indoor coil which is equipped with a liquid line which served
as a metering device (RFCI), the liquid line must be
replaced prior to the installation of the XP13 unit. Typically
a liquid line used to meter flow is 1/4" in diameter and
copper.

INSTALLING LINE SET
Line Set IsolationThis reference illustrates

procedures, which ensure proper refrigerant line set
isolation:

 Installation of line set on horizontal runs is

illustrated in figure 15.

 Installation of line set on vertical runs is illustrated in

figure 16.

 Installation of a transition from horizontal to

vertical is illustrated in figure 17.

TO HANG LINE SET FROM JOIST OR
RAFTER, USE EITHER METAL STRAPPING
MATERIAL OR ANCHORED HEAVY NYLON
WIRE TIES.

STRAPPING MATERIAL

(AROUND SUCTION

LINE ONLY)

FLOOR JOIST OR

ROOF RAFTER

TAPE OR
WIRE TIE

8 FEET

FLOOR JOIST OR

ROOF RAFTER

STRAP THE SUCTION LINE TO
THE JOIST OR RAFTER AT 8 FEET

METAL

SLEEVE

INTERVALS THEN STRAP THE
LIQUID LINE TO THE SUCTION
LINE.

8 FEET

Figure 15. Refrigerant Line Set: Installing

Horizontal Runs

WIRE TIE
(AROUND
SUCTION LINE
ONLY)

TAPE OR

WIRE TIE

Page 9

XP13 SERIES

IMPORTANT - REFRIGERANT LINES MUST NOT CONTACT WALL.

OUTSIDE WALL

WOOD BLOCK

BETWEEN STUDS

NOTE − SIMILAR INSTALLATION
PRACTICES SHOULD BE USED
IF LINE SET IS TO BE INSTALLED
ON EXTERIOR OF OUTSIDE
WALL.

SUCTION LINE

WIRE TIE

INSIDE WALL

STRAP

SLEEVE

WIRE TIE

WIRE TIE

LIQUID LINE

WOOD BLOCK

STRAP

Brazing Connections

Use the following procedure to braze the line set to the new
air conditioner unit. Figure 18 is provided as a general
guide for preparing to braze the line set to the air
conditioner unit.

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.

SLEEVE

SUCTION LINE

WRAPPED WITH

ARMAFLEX

LIQUID LINE

OUTSIDE

PVC

PIPE

WALL

FIBERGLASS

INSULATION

CAULK

IMPORTANT! REFRIGERANT
LINES MUST NOT CONTACT
STRUCTURE.

Figure 16. Refrigerant Line Set: Installing Vertical

Runs (New Construction Shown)

ANCHORED HEAVY NYLON
WIRE TIE OR AUTOMOTIVE

MUFFLER−TYPE HANGER

WALL
STUD

METAL SLEEVE SUCTION LINE − WRAPPED IN

MUFFLER-TYPE HANGER

AUTOMOTIVE

STRAP LIQUID LINE
TO SUCTION LINE

LIQUID LINE

ARMAFLEX

Figure 17. Refrigerant Line Set: Transition from

Vertical to Horizontal

WARNING

When using a high pressure gas such
as dry nitrogen to pressurize a
refrigeration or air conditioning
system, use a regulator that can
control the pressure down to 1 or 2
psig (6.9 to 13.8 kPa).

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 suction
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
underneath the valve body to protect the base paint.
Also, shield the light maroon R−410A sticker.

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.

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 suction service
valve.

506270−01 05/09

Page 10

1

2

3

CUT AND DEBUR

7

INSTALL CORE ONLY FOR

BOTH SERVICE PORTS after they

have coolED.

INDOOR UNIT

6

BRAZE LINE SET

REMOVE CAP AND CORE FROM

BOTH LIQUID AND SUCTION

SERVICE PORTS

SERVICE PORT MUST BE

OPEN TO ALLOW EXIT
POINT FOR NITROGEN

SUCTION LINE

LIQUID LINE

Figure 18. Brazing Connections

NOTE − The RFCIV or TXV metering device at the indoor
unit 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 liquid line to the liquid line service valve.
Turn off nitrogen flow. Repeat procedure starting at
paragraph 4 for brazing the suction line to the suction
service valve.

7. After all connections have been brazed, disconnect
manifold gauge set the from service ports, cool down
piping with wet rag and remove all wrappings. Do not
reinstall cores until after evacuation procedure.
Reinstall service caps if desired to close off refrigerant
ports.

Removing Indoor Unit Metering Device

Remove the existing HCFC−22 refrigerant flow control
orifice or thermal expansion valve from the indoor coil. The
existing indoor unit HCFC−22 metering device is not
approved for use with HFC−410A refrigerant and may
prevent proper flushing.

REPLACEMENT PARTS

If replacement parts are necessary for the indoor unit,
order kit 69J46. The kit includes:

 10  Brass nuts for liquid line assemblies

ATTACH

GAUGES

SERVICE

5

VALVE

SERVICE

VALVE

outdoor

UNIT

FLOW NITROGEN

NITROGEN

4

WRAP

SERVICE

VALV E

 20  Teflon rings
 10  Liquid line orifice housings
 10  Liquid line assemblies

LIQUID LINE ORIFICE HOUSINGS (10)

TEFLON RINGS (20)

LIQUID LINE ASSEMBLIES

(INCLUDES STRAINER) (10)

Figure 19. 69J46 Kit Components

TYPICAL FIXED ORIFICE REMOVAL PROCEDURE

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 liquid
line orifice housing. Take care not to twist or damage
distributor tubes during this process.

4. Remove and discard fixed orifice, valve stem
assembly if present and Teflon washer as illustrated in
figure 20.

5. Use a field−provided fitting to temporary reconnect the
liquid line to the indoor unit’s liquid line orifice housing.

BRASS NUTS (10)

LIQUID LINE

ASSEMBLY

PISTON
RETAINER

STRAINER

COPPER
TUBE

Page 11

XP13 SERIES

DISTRIBUTOR

ASSEMBLY

DISTRIBUTOR TUBES

LIQUID LINE ORIFICE HOUSING

TEFLON RING

FIXED
ORIFICE

REMOVE AND DISCARD
VALVE STEM ASSEMBLY
(IF PRESENT)

BRASS NUT

5. Disconnect the liquid line from the TXV at the liquid line
assembly.

6. Disconnect the TXV from the liquid line orifice housing.
Take care not to twist or damage distributor tubes
during this process.

7. Remove and discard TXV and the two Teflon rings as
illustrated in figure 21.

8. Use a field−provided fitting to temporary reconnect the
liquid line to the indoor unit’s liquid line orifice housing.

Flushing the System

LIQUID LINE ASSEMBLY

(INCLUDES STRAINER)

VALVE STEM

VALVE STEM CAP

(Uncased Coil Shown)

Figure 20. Typical Fixed Orifice Removal

TYPICAL TXV REMOVAL PROCEDURE

TWO PIECE

PATCH PLATE

(UNCASED COIL

ONLY)

DISTRIBUTOR

TUBES

DISTRIBUTOR

ASSEMBLY

MALE EQUALIZER LINE

FITTING

(Uncased Coil Shown)

LIQUID LINE

ORIFICE HOUSING

EQUALIZER
LINE

SENSING BULB

STUB END

TXV

TEFLON
RING

LIQUID LINE ASSEMBLY

WITH BRASS NUT

SUCTION

LINE

TEFLON

RING

SENSING

LINE

LIQUID

LINE

Figure 21. Typical TXV Removal

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. Disconnect the equalizer line from the TXV equalizer
line fitting on the suction line.

4. Remove the suction line sensing bulb as illustrated in
figure 21.

IMPORTANT

The line set and indoor unit coil must be flushed
with at least the same amount of clean refrigerant
that previously charged the system. Check the
charge in the flushing cylinder before proceeding.

CAUTION

This procedure should not be performed on
systems which contain contaminants (Example:
compressor burn out).

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.

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.

If the original system used:

 HCFC−22 refrigerant, then flush the system using the

procedure provided in this section.

 HFC−410A refrigerant, then proceed to Installing New

Refrigerant Metering Device.

506270−01 05/09

Page 12

INVERTED HCFC−22 CYLINDER
CONTAINS CLEAN HCFC−22 TO
BE USED FOR FLUSHING.

SUCTION LINE

SERVICE VALVE

EXISTING

INDOOR unit

LIQUID LINE SERVICE VALVE

RECOVERY

CYLINDER

SUCTION

LIQUID

NOTE − THE INVERTED HCFC−22 CYLINDER MUST CONTAIN AT LEAST THE SAME
AMOUNT OF REFRIGERANT AS WAS RECOVERED FROM THE EXISTING SYSTEM.

NEW

OUTDOOR

UNIT

OPENED

RECOVERY MACHINE

GAUGE

MANIFOLD

LOW

PRESSURE

TANK
RETURN

INLET

DISCHARGE

HIGH

PRESSURE

CLOSED

Figure 22. Typical Flushing Connection

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).

FLUSHING PROCEDURE

1. Connect the following:

 HCFC−22 cylinder with clean refrigerant to the

suction service valve,

 HCFC−22 gauge set to the liquid line valve,
 Recovery machine with an empty recovery tank to

the gauge set.

2. 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.

3. Invert the cylinder of clean HCFC−22 and open its
valve to allow liquid refrigerant to flow into the system
through the suction 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.

4. After all of the liquid refrigerant has been recovered,
switch the recovery machine to suction recovery so
that all of the HCFC−22 suction is recovered. Allow the
recovery machine to pull a vacuum on the system.

5. 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.

Installing New Indoor Metering Device

XP13 units use CTXV for metering refrigerant only. This
section provides instructions on installing CTXV
refrigerant metering device.

Page 13

9

10

8

11

1/8 TURN

10

8

11

12

7

6

12

1

2

3

9

4

7

5

6

1/2 TURN

1

2

3

4

5

Figure 23. Tightening Distance

TYPICAL CTXV INSTALLATION PROCEDURE

TWO PIECE

PATCH PLATE

(UNCASED COIL

ONLY)

DISTRIBUTOR

TUBES

DISTRIBUTOR

ASSEMBLY

MALE EQUALIZER LINE

FITTING (SEE FIGURE 26

FOR FURTHER DETAILS)

SENSING BULB INSULATION IS
REQUIRED IF MOUNTED EXTERNAL
TO THE COIL CASING. SEE FIGURE 25
FOR BULB POSITIONING.

(Uncased Coil Shown)

LIQUID LINE

ORIFICE

HOUSING

EQUALIZER
LINE

STUB END

CTXV

TEFLON
RING

LIQUID LINE ASSEMBLY

WITH BRASS NUT

SUCTION
LINE

TEFLON

RING

SENSING

LINE

LIQUID

LINE

Figure 24. Typical TXV Installation

The CTXV unit 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 in a
manner that will provide access for field servicing of the
CTXV. Refer to Figure 24 for reference during installation
of CTXV unit.

1. Remove the field−provided fitting that temporary
reconnected the liquid line to the indoor unit’s
distributor assembly.

2. Install one of the provided Teflon rings around the
stubbed end of the CTXV and lightly lubricate the
connector threads and expose surface of the Teflon
ring with refrigerant oil.

3. Attach the stubbed end of the CTXV to the liquid line
orifice housing. Finger tighten and use an appropriately
sized wrench to turn an additional 1/2 turn clockwise
as illustrated in figure 23, or 20 ft−lb.

4. Place the remaining Teflon washer around the other
end of the CTXV. Lightly lubricate connector threads

XP13 SERIES

and expose surface of the Teflon ring with refrigerant
oil.

5. Attach the liquid line assembly to the CTXV. Finger
tighten and use an appropriately sized wrench to turn
an additional 1/2 turn clockwise as illustrated in figure
23, or 20 ft−lb.

6. Attach the suction line sensing bulb in the proper
orientation as illustrated in figure 25 using the clamp
and screws provided.

NOTE − Insulating the sensing bulb once installed may be
required when the bulb location is external to the coil
casing.

SUCTION LINE

ON LINES SMALLER THAN
7/8", MOUNT SENSING BULB
AT EITHER THE 3 OR 9
O’CLOCK POSITION.

8. Connect the equalizer line from the TXV to the
equalizer suction port on the suction line. Finger
tighten the flare nut plus 1/8 turn (7 ft−lbs) as illustrated
in figure 23.

NOTE − To prevent any possibility of water damage,
properly insulate all parts of the TXV assembly that may
sweat due to temperature differences between the valve
and its surrounding ambient temperatures.

See the XP13 Engineering Handbook for approved CTXV
kit match−ups and application information.

The reference CTXV kits include:
1  CTXV
2  Teflon rings
1  1 1/4" wide copper mounting strap for sensing bulb
2  #10 hex head bolts and nuts for securing sensing bulb

BULB

SUCTION LINE

BULB

NOTE − NEVER MOUNT ON BOTTOM OF LINE.

12

12

BULB

ON 7/8" AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O’CLOCK
POSITION. NEVER MOUNT
ON BOTTOM OF LINE.

BULB

Figure 25. TXV Sensing Bulb Installation

7. Remove and discard either the flare seal cap or flare
nut with copper flare seal bonnet from the equalizer
line port on the suction line as illustrated in figure 26.

IMPORTANT

When removing the flare nut, ensure that the copper
flare seal bonnet is removed.

FLARE SEAL

CAP

OR

FLARE NUT

COPPER

FLARE SEAL

BONNET

CTXV (1)

HEX HEAD BOLTS

AND NUTS (2)

TEFLON
RINGS (2)

COPPER

MOUNTING

STRAP (1)

Figure 27. CTXV Kit Components

Testing for Leaks

After the line set has been connected to the indoor unit and
air conditioner, check the line set connections and indoor
unit for leaks. Use the following procedure to test for leaks:

IMPORTANT

Leak detector must be capable of sensing HFC
refrigerant.

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.

MALE BRASS EQUALIZER

Figure 26. Copper Flare Seal Bonnet Removal

506270−01 05/09

LINE FITTING

SUCTION LINE

WARNING

When using a high pressure gas such
as dry nitrogen to pressurize a
refrigeration or air conditioning
system, use a regulator that can
control the pressure down to 1 or 2
psig (6.9 to 13.8 kPa).

Page 14

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.

1. Connect an HFC−410A manifold gauge set high
pressure hose to the suction valve service port.

(Normally, the high pressure hose is connected to the
liquid line port; however, connecting it to the suction
port better protects the manifold gauge set from high
pressure damage.)

2. With both manifold valves closed, connect the cylinder
of HFC−410A refrigerant to the center port of the
manifold gauge set. Open the valve on the HFC−410A
cylinder (suction 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 two ounces (57 g) refrigerant or three
pounds (31 kPa) pressure]. Close the valve on the

HFC−410A cylinder and the valve on the high pressure
side of the manifold gauge set. Disconnect the
HFC−410A cylinder.

4. Connect a cylinder of dry nitrogen with a pressure
regulating valve to the center port of the manifold
gauge set.

5. 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.

6. 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.

7. After leak testing disconnect gauges from service
ports.

Evacuating the System

Evacuating the system of non−condensables is critical for
proper operation of the unit. Non−condensables are
defined as any gas that will not condense under
temperatures and pressures present during operation of
an air conditioning system. Non−condensables and water
suction combine with refrigerant to produce substances
that corrode copper piping and compressor parts.

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.

IMPORTANT

Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
capable of accurately measuring down to 50 microns.

NOTE − Remove cores from service valves if not already
done.

1. Connect manifold gauge set to the service valve ports
as follows:

 low pressure gauge to suction 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
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.

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.

Page 15

XP13 SERIES

Figure 28. Typical Wiring Diagram

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 valve
1 to 2 psig in order to release the vacuum in the line set
and indoor unit.

10. Perform the following:

A Close manifold gauge valves.

B Shut off HFC−410A cylinder.

C Reinstall service valve cores by removing

manifold hose from service valves. Quickly install
cores with core tool while maintaining a positive
system pressure.

D Replace the stem caps and secure finger tight,

then tighten an additional one−sixth (1/6) of a turn
as illustrated in figure 1.

Servicing Units Delivered Void of Charge

If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.

1. Use nitrogen to pressurize the system and check for
leaks. Repair all leaks.

2. Evacuate the system to remove as much of the
moisture as possible.

3. Use nitrogen to break the vacuum and install a new
filter drier in the system.

4. Evacuate the system again. Then, weigh the
appropriate amount of HFC−410A refrigerant as listed
on unit nameplate into the system.

5. Monitor the system to determine the amount of
moisture remaining in the oil. It may be necessary to
replace the filter drier several times to achieve the
required dryness level. If system dryness is not

verified, the compressor will fail in the future.

506270−01 05/09

Page 16

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.

NOTE − 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.

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 over­current protection size.

Figure 29. Typical Field Wiring

THERMOSTAT INDOOR UNIT OUTDOOR UNIT

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.

Wire run length AWG # Insulation type

less than 100’ (30m) 18

more than 100’ (30m) 16

NOTE − Units are approved for use only with copper
conductors. Refer to figure 29 for high voltage field wiring
diagram. (A complete unit wiring diagram is located inside
the unit control box cover.)

3. 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 effected by sunlight, drafts or vibrations.

4. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit. See figures 30 and

31. ( 24V, Class II circuit connections are made in the

low voltage junction box.)

color−coded, temperature
rating 35ºC minimum

W1

W2

W3

R

C

G

24V POWER

COMMON

1ST-STAGE

AUXILIARY

HEAT

R

C

W1

O

Y1

R

24V POWER

C

COMMON

W1

1ST-STAGE

AUXILIARY

HEAT

G

INDOOR BLOWER

O

REVERSING VALVE

Y1

COMPRESSOR

(SOME CONNECTIONS MAY NOT APPLY. REFER
TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)

Figure 30. Outdoor and Blower Unit Thermostat

Designations

THERMOSTAT

R

24V POWER 24V POWER

C

COMMON

E

EMERGENCY

HEAT

W1

1ST-STAGE

AUXILIARY

HEAT

G

INDOOR BLOWER

O

REVERSING VALVE

Y1

COMPRESSOR

(SOME CONNECTIONS MAY NOT APPLY. REFER TO
SPECIFIC THERMOSTAT AND INDOOR UNIT.)

INDOOR UNIT OUTDOOR UNIT

W2

W3

W1

R

C

G

COMMON

1ST-STAGE

AUXILIARY

HEAT

R

C

W1

O

Y1

EMERGENCY

HEAT RELAY

OUTDOOR
THERMOSTAT

NOTE − For proper voltages, select thermostat wire gauge
per the following chart:

Figure 31. Outdoor and Blower Unit Thermostat

Designations (with emergency heat)

Page 17

XP13 SERIES

Start−Up and Charging Procedures

IMPORTANT

If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start−up to
prevent compressor damage as a result of slugging.

1. Rotate fan to check for binding.

2. Inspect all factory− and field−installed wiring for loose
connections.

3. After evacuation is complete, open both the liquid and
vapor line service valves to release the refrigerant
charge contained in outdoor unit into the system.

4. Replace the stem caps and tighten to the value listed
in table 1.

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 refrigerate 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 it with components designed for use
with HCFC−22. This unit is NOT approved for use with coils
which use capillary tubes as a refrigerant metering device.

Temp.
of air
entering
indoor
coil ºF

A

Wet−bulb ºF

C

53º

DRY

BULB

All temperatures are
expressed in ºF

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

Dry−bulb

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

T

Drop

19º

air flowair flow

INDOOR
COIL

B

B

64º

WET

BULB

A

72º

DRY

BULB

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 2.

 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 using the
illustration in figure 32.

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,

 Measuring voltage supplied to the unit,

 Measuring amperage being drawn by the heat unit(s).

Then, apply the measurements taken in following formula
to determine CFM:

CFM =

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

1. Determine the desired DTMeasure entering air temperature
using dry bulb (A) and wet bulb (B). DT is the intersecting 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). Temperature Drop
Formula: (T

3. Determine if fan needs adjustmentIf the difference between
the measured T
adjustment is needed. See examples: Assume DT = 15 and A temp.
= 72º, these C temperatures would necessitate stated actions:

Cº T

Drop

53º 19 – 15 = 4 Increase the airflow
58º 14 – 15 = −1 (within +3º range) no change
62º 10 – 15 = −5 Decrease the airflow

4. Adjust the fan speedSee indoor unit instructions to increase/

decrease fan speed.

Changing air flow affects all temperatures; recheck temperatures to
confirm that the temperature drop and DT are within +3º.

Amps x Volts x 3.41

1.08 x Temperature rise (F)

Adjust amount. for
variation in line set

length listed on table

in figure 33.

Additional charge

specified per

indoor unit

match−up listed in

table 3.

+ + =

) = A minus C.

Drop

and the desired DT (T

Drop

– DT = ºF ACTION

–DT) is within +3º, no

Drop

Total

charge

Figure 32. Checking Indoor Coil Airflow Guide

506270−01 05/09

Page 18

WEIGH IN

Refrigerant Charge per Line Set Length

Liquid Line

Set Diameter

3/8" (9.5 mm)

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

SATº
LIQº –
SCº =

Ounces per 5 feet (g per 1.5 m)

adjust from 15 feet (4.6 m) line set*

3 ounce per 5’ (85 g per 1.5 m)

Figure 33. Using Weigh In Method

1 Check the airflow as illustrated in figure 32 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 4,

(The reference table is a general guide. Expect minor pressure variations. Significant differences may
mean improper charge or other system problem.)

USE COOLING

MODE

60ºF (15º)

USE HEATING

MODE

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 in table 5 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 3 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.

12 Disconnect gauge set and re−install both the liquid and suction service valve caps.

1. Check Liquid and suction line pressures

2. Compare unit pressures with Table 4,
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 34. Using Subcooling Method

Page 19

XP13 SERIES

Table 3. Unit Indoor Matchups for Subcooling

g

Subcooling

g

Subcooling

−018

Target

INDOOR MATCHUPS

CBX26UH–018 23 5 0 1
CBX26UH–024 23 5 0 1
CBX27UH–018/024 15 8 0 2
CBX32MV–018/024 30 3 0 0
CBX32MV–024/030 15 8 0 2
CBX40UHV−024 30 3 0 0
CBX40UHV−030 15 8 0 2

Subcoolin

Heat Cool

5ºF)(+1ºF)

(+

*Add charge

lb oz

−024

CBX26UH–024 23 5 0 1
CBX26UH–030 23 3 1 3
CBX27UH–018/024 12 3 0 11
CBX27UH–030 12 3 1 4
CBX32M–030 12 3 0 11
CBX32M–036 12 3 1 4
CBX32MV–018/024 12 6 0 5
CBX32MV–024/030 12 3 0 11
CBX40UHV−024 12 6 0 5
CBX40UHV−030 12 3 0 11
CH33–25A 16 6 0 7
CH33–31A 12 3 0 7
CH33–31B 12 3 0 15
CH33–36A 16 6 0 7
CH33–36B 16 7 0 15
CH33–36C 12 5 0 0
CR33–30, –36 12 4 0 3
CX34–25 12 6 0 5
CX34–31 12 3 0 11
CX34–36 16 7 0 11

−030

CBX26UH–030, –036 22 4 0 11
CBX27UH−030 15 4 0 11
CBX27UH−036 15 4 0 11
CBX32M–030, –036 15 4 0 11
CBX32M–042 15 4 0 11
CBX32MV–024/030, –036 15 4 0 11
CBX40UHV−024, −030, −036 15 4 0 11
CH33–25A 20 3 0 8
CH33–31A 15 4 0 11
CH33–31B 20 4 0 11
CH33–36A 20 3 0 8
CH33–36C 15 3 0 11
CH33–42B 20 4 0 11
CR33–30, –36 38 9 1 9
CX34–25 15 3 0 12
CX34–31 15 4 0 11
CX34–36 27 2 0 0
CX34–38 SN# 6007K and after 4 4 0 11
CX34–38 before SN# 6007K 20 4 0 11
CX34–42 27 2 0 0

−036

CBX26UH–036 25 5 2 2
CBX27UH−036 10 5 2 2
CBX27UH−042 10 10 2 8
CBX32M–036, –042 10 5 2 2
CBX32MV–036 10 5 2 2
CBX40UHV−036 10 5 2 2
CH33–31A 10 5 0 2

Target

INDOOR MATCHUPS

CH33–31B 10 5 1 0
CH33–36C 10 4 0 0
CH33–42 10 11 2 3
CH33–44, –48 10 11 2 5
CR33–36 10 4 0 1
CR33–48 30 5 2 3
CR33–50/60 30 11 2 5
CX34–38 SN# 6007K and after 5 5 2 2
CX34–38 before SN# 6007K 10 5 2 2
CX34–44/48 10 5 2 2

Subcoolin

Heat Cool

5ºF)(+1ºF)

(+

*Add charge

lb oz

−042

CH23–65 32 6 0 12
CBX26UH–042 26 6 1 2
CBX26UH–048 10 12 4 5
CBX27UH−042 15 5 0 0
CBX27UH−048 15 5 0 0
CBX32M–036, –042 15 5 0 0
CBX32MV–036 15 5 0 0
CBX40UHV−034, −042 15 5 0 0
CH33–43B 10 12 4 8
CH33–43C 10 6 1 1
CH33–44 10 6 0 16
CH33–48 10 6 1 1
CH33–49C 10 12 3 12
CR33–48 32 5 0 5
CR33–50/60 32 9 2 6
CX34–43 10 6 1 1
CX34–49 10 12 3 7
CX34–50/60 10 6 1 1
CX34–60 10 9 2 6

−048

CBX26UH–048 12 11 0 8
CBX26UH–060 5 12 3 8
CBX27UH−048 10 9 0 7
CBX27UH−060 10 9 0 7
CBX32M–048 10 9 0 7
CBX32MV–048 10 9 0 7
CBX40UHV−048 10 9 0 7
C33–43 0 4 0 3
CH33–43C 13 4 0 3
CH33–49C 10 9 0 7
CH33–60 10 7 0 5
CR33–48 36 4 0 0
CR33–50/60, –60 35 7 0 5
CX34–60 10 7 0 5

−060

CBX26UH–060 10 9 3 3
CBX27UH−060 10 8 1 12
CBX32MV–060 10 8 1 12
CBX32MV–068 10 9 2 5
CBX40UHV−060 10 8 1 12
CH33–62 10 9 2 7
CR33–60 35 4 0 0
CX34–60 15 4 0 0
CX34–62 10 9 2 1

*Amount of charge required in additional to charge shown on unit nameplate. (Remember to consider line set length difference.)

506270−01 05/09

Page 20

Table 4. Normal Operating Pressures − Liquid +10 and Vapor +5 PSIG*

IMPORTANT

Use table 4 as a general guide when performing maintenance checks. This is not a procedure for charging the
unit (Refer to Charging / Checking Charge section). Minor variations in these pressures may be expected due
to differences in installations. Significant differences could mean that the system is not properly charged or that
a problem exists with some component in the system.

Model −018 −024 −030 −036 −042 −048 −060

ºF (ºC)** Liquid Line Pressure / Vapor Line Pressure

Cooling Operation

65 (18) 228 / 140 232 / 139 245 / 135 251 / 134 239 / 135 244 / 139 248 / 129

75 (24) 265 / 142 268 / 142 284 / 137 292 / 138 277 / 136 283 / 141 289 / 131

85 (29) 311 / 144 317 / 144 328 / 140 339 / 140 321 / 139 318 / 143 336 / 132

95 (35) 350 / 147 366 / 146 377 / 144 392 / 143 379 / 142 369 / 145 385 / 133

105 (41) 402 / 149 412 / 148 429 / 145 443 / 145 423 / 144 420 / 148 440 / 136

115 (45) 458 / 152 464 / 152 486 / 147 508 / 149 484 / 147 484 / 150 500 / 140

Heating Operation

60 (16) 350 / 135 348 / 130 341 / 123 350 / 131 366 / 129 350 / 120 379 / 127

50 (10) 321 / 116 330 / 109 324 / 107 331 / 111 348 / 107 333 / 106 361 / 109

40 (4.5) 301 / 96 315 / 89 307 / 88 304 / 96 336 / 89 294 / 92 341 / 89

30 (−1) 294 / 81 301 / 77 290 / 76 295 / 77 317 / 70 291 / 73 323 / 72

20 (−7) 278 / 64 286 / 64 274 / 62 290 / 62 295 / 60 283 / 59 305 / 59

*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 outdoor coil.

Table 5. HFC−410A Temperature (°F) − Pressure (Psig)

°F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig

32 100.8 48 137.1 63 178.5 79 231.6 94 290.8 11 0 365.0

33 102.9 49 139.6 64 181.6 80 235.3 95 295.1 111 370.0 126 451.8 142 552.3

34 105.0 50 142.2 65 184.3 81 239.0 96 299.4 11 2 375.1 127 457.6 143 559.1

35 107.1 51 144.8 66 187.7 82 242.7 97 303.8 11 3 380.2 128 463.5 144 565.9

36 109.2 52 147.4 67 190.9 83 246.5 98 308.2 11 4 385.4 129 469.5 145 572.8

37 111.4 53 150.1 68 194.1 84 250.3 99 312.7 115 390.7 130 475.6 146 579.8

38 113.6 54 152.8 69 197.3 85 254.1 100 317.2 11 6 396.0 131 481.6 147 586.8

39 115.8 55 155.5 70 200.6 86 258.0 101 321.8 11 7 401.3 132 487.8 148 593.8

40 118.0 56 158.2 71 203.9 87 262.0 102 326.4 11 8 406.7 133 494.0 149 601.0

41 120.3 57 161.0 72 207.2 88 266.0 103 331.0 11 9 412.2 134 500.2 150 608.1

42 122.6 58 163.9 73 210.6 89 270.0 104 335.7 120 417.7 135 506.5 151 615.4

43 125.0 59 166.7 74 214.0 90 274.1 105 340.5 121 423.2 136 512.9 152 622.7

44 127.3 60 169.6 75 217.4 91 278.2 106 345.3 122 428.8 137 519.3 153 630.1

45 129.7 61 172.6 76 220.9 92 282.3 107 350.1 123 434.5 138 525.8 154 637.5

46 132.2 62 175.4 77 224.4 93 286.5 108 355.0 124 440.2 139 532.4 155 645.0

47 134.6 78 228.0 109 360.0 140 539.0

125 445.9

141 545.6

Page 21

XP13 SERIES

System Operation

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.

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.

Pressure Switch Event Settings

The following are the auto reset values for low and high
pressures switches:

 High Pressure (auto reset) − trip at 590 psig, reset at

418 psig.

 Low Pressure (auto reset) − trip at 25 psig, reset at 40

psig.

Defrost System

The XP13 defrost system includes two components: a
defrost thermostat and a defrost control board (figure 35).

DEFROST THERMOSTAT

The defrost thermostat is located on the liquid line between
the check/expansion valve and the distributor. When
defrost thermostat senses 42°F (5.5°C) or cooler, the
thermostat contacts close and send a signal to the defrost
control board to start the defrost timing. It also terminates
defrost when the liquid line warms up to 70°F (21°C).

DEFROST CONTROL

The defrost control board includes the combined functions
of a time/temperature defrost control, defrost relay,
diagnostic LEDs and terminal strip for field wiring
connections.

The control provides automatic switching from normal
heating operation to defrost mode and back. During
compressor cycle (call for defrost), the control
accumulates compressor run times at 30-, 60-, or
90-minute field−adjustable intervals. If the defrost
thermostat is closed when the selected compressor run
time interval ends, the defrost relay is energized and
defrost begins.

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.

LOW PRESSURE SWITCH

The XP13 is equipped with an auto−reset low pressure
switch which is located on the vapor line. The switch shuts
off the compressor when the vapor pressure falls below the
factory setting.

HIGH PRESSURE SWITCH

The XP13 is equipped with a auto-reset high pressure
switch (single−pole, single−throw) which is located on the
liquid line. The switch shuts off the compressor when
discharge pressure rises above the factory setting.

NOTE − A Schrader core is under the pressure switches.

FIELD SELECT

TIMING PINS

TEST

PINS

DIAGNOSTIC

COMPRESSOR

DELAY PINS

REVERSING

VALV E

S87

LOW PRESSURE

SWITCH

DEFROST

THERMOSTAT

S4

HIGH PRESSURE

SWITCH

LEDS

24V TERMINAL
STRIP
CONNECTIONS

Figure 35. Outdoor Unit Defrost Control Board

506270−01 05/09

Page 22

DEFROST CONTROL TIMING PINS

Each timing pin selection provides a different
accumulated compressor run time period for one defrost
cycle. This time period must occur before a defrost cycle
is initiated. The defrost interval can be adjusted to 30
(T1), 60 (T2), or 90 (T3) minutes (see figure 35). The
defrost timing jumper is factory−installed to provide a
60−minute defrost interval. If the timing selector jumper
is not in place, the control defaults to a 90−minute defrost
interval. The maximum defrost period is 14 minutes and
cannot be adjusted.

A TEST option is provided for troubleshooting. The TEST

mode may be started any time the unit is in the heating
mode and the defrost thermostat is closed or
jumpered. If the jumper is in the TEST position at

power-up, the control will ignore the test pins. When the
jumper is placed across the TEST pins for two seconds,
the control will enter the defrost mode. If the jumper is
removed before an additional 5−second period has
elapsed (7 seconds total), the unit will remain in defrost
mode until the defrost thermostat opens or 14 minutes
have passed. If the jumper is not removed until after the
additional 5−second period has elapsed, the defrost will
terminate and the test option will not function again until the
jumper is removed and re−applied.

COMPRESSOR DELAY

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. The compressor will be
cycled off for 30 seconds going in and out of the defrost
mode when the compressor delay jumper is removed.

NOTE − The 30-second compressor feature is ignored
when jumpering the TEST pins.

TIME DELAY

The timed-off delay is five minutes long. The delay helps to
protect the compressor from short-cycling in case the
power to the unit is interrupted or a pressure switch opens.
The delay is bypassed by placing the timer select jumper
across the TEST pins for 0.5 seconds.

PRESSURE SWITCH CIRCUIT

The defrost control incorporates two pressure switch
circuits. The high pressure switch (S4) is
factory-connected to the board’s HI PS terminals (see
figure 35). The board also includes a low pressure, or
loss-of-charge-pressure, switch (S87). Switches are
shown in wiring diagrams in figures 28 and 35.

During a single demand cycle, the defrost control will lock
out the unit after the fifth time that the circuit is interrupted
by any pressure switch wired to the control board. In
addition, the diagnostic LEDs will indicate a locked-out
pressure switch after the fifth occurrence of an open
pressure switch as listed in table 6. The unit will remain
locked out until power to the board is interrupted, then
re-established or until the jumper is applied to the TEST
pins for 0.5 seconds.

Table 6. Defrost Control Board Diagnostic LED

Mode Green LED (DS2) Red LED (DS1)

No power to con­trol

Normal operation /
power to control

Anti-short cycle
lockout

Low pressure
switch fault

Low pressure
switch lockout

High pressure
switch fault

High pressure
switch lockout

OFF OFF

Simultaneous Slow FLASH

Alternating Slow FLASH

OFF Slow FLASH

OFF ON

Slow FLASH OFF

ON OFF

NOTE − The defrost control board ignores input from the
low-pressure switch terminals as follows:

S during the TEST mode,
S during the defrost cycle,
S during the 90-second start-up period,
S and for the first 90 seconds each time the reversing

valve switches heat/cool modes.

DIAGNOSTIC LEDS

The defrost board uses two LEDs for diagnostics. The
LEDs flash a specific sequence according to the condition.

Maintenance

WARNING

Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.

Before the start of each heating and cooling season, the
following service checks should be performed by a
qualified service technician. First, turn off electrical power
to the unit prior to performing unit maintenance.

 Inspect and clean the outdoor and indoor coils. The

outdoor coil may be flushed with a water hose.

NOTE − It may be necessary to flush the outdoor coil
more frequently if it is exposed to substances which
are corrosive or which block airflow across the coil
(e.g., pet urine, cottonwood seeds, etc.)

 Visually inspect the refrigerant lines and coils for leaks.
 Check wiring for loose connections.
 Check voltage at the indoor and outdoor units (with

units operating).

 Check the amperage draw at the outdoor fan motor,

compressor, and indoor blower motor. Values should
be compared with those given on unit nameplate.

 Check, clean (or replace) indoor unit filters.
 Check the refrigerant charge and gauge the system

pressures.

Page 23

XP13 SERIES

 Check the condensate drain line for free and

unobstructed flow; clean, if necessary.

 Adjust blower speed for cooling. Measure the pressure

drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.

 Check drive belt for wear and proper tension.

NOTE − If owner reports insufficient cooling, the unit
should be gauged and refrigerant charge checked.
Refer to section on refrigerant charging in this
instruction.

Homeowner Information

In order to ensure peak performance, your system must be
properly maintained. Clogged filters and blocked airflow
prevent your unit from operating at its most efficient level.

1. Air FilterAsk your Lennox dealer to show you where

your indoor unit’s filter is located. It will be either at the
indoor unit (installed internal or external to the cabinet)
or behind a return air grille in the wall or ceiling. Check
the filter monthly and clean or replace it as needed.

2. Disposable FilterDisposable filters should be

replaced with a filter of the same type and size.

NOTE − If you are unsure about the filter required for
your system, call your Lennox dealer for assistance.

IMPORTANT

Turn off electrical power to the unit at the
disconnect switch before performing any
maintenance. The unit may have multiple power
supplies.

3. Reusable FilterMany indoor units are equipped

with reusable foam filters. Clean foam filters with a
mild soap and water solution; rinse thoroughly; allow
filter to dry completely before returning it to the unit or
grille.

NOTE − The filter and all access panels must be in
place any time the unit is in operation.

4. Electronic Air CleanerSome systems are

equipped with an electronic air cleaner, designed to
remove airborne particles from the air passing through
the cleaner. If your system is so equipped, ask your
dealer for maintenance instructions.

5. Indoor UnitThe indoor unit’s evaporator coil is

equipped with a drain pan to collect condensate
formed as your system removes humidity from the
inside air. Have your dealer show you the location of
the drain line and how to check for obstructions. (This
would also apply to an auxiliary drain, if installed.)

IMPORTANT

Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure
of the unit to treated water (i.e., sprinkler systems,
soakers, waste water, etc.) will corrode the surface
of steel and aluminum parts and diminish perfor­mance and longevity of the unit.

6. Inspect and clean outdoor coil:

 Make sure no obstructions restrict airflow to the

outdoor unit. Leaves, trash or shrubs crowding the
unit cause the outdoor unit to work harder and use
more energy. Keep shrubbery trimmed away from
the unit and periodically check for debris which
collects around the unit.

 When removing debris from around the unit, be

aware of metal edges on parts and screws.
Although special care has been take to keep
exposed edges to a minimum, physical contact
with metal edges and corners while apply
excessive force or rapid motion can result in
personal injury.

 Clearing of the outdoor unit’s coil should be

performed by a trained service technician.
Contact your dealer and set up a schedule
(preferably twice a year, but at least once a year)
to inspect and service your system.

NOTE − If outdoor unit is installed in a seacoast application,
it is recommended to increase the frequency of washing to
a minimum of every three months. Contact your installing
contractor for more details on proper outdoor coil washing
procedures in your geographic area.

HEAT PUMP OPERATION

Your new Lennox heat pump has several characteristics
that you should be aware of:

 Heat pumps satisfy heating demand by delivering

large amounts of warm air into the living space. This
is quite different from gas- or oil-fired furnaces or an
electric furnace which deliver lower volumes of
considerably hotter air to heat the space.

 Do not be alarmed if you notice frost on the outdoor coil

in the winter months. Frost develops on the outdoor
coil during the heating cycle when temperatures are
below 45°F (7°C). An electronic control activates a
defrost cycle lasting 5 to 15 minutes at preset intervals
to clear the outdoor coil of the frost.

 During the defrost cycle, you may notice steam rising

from the outdoor unit. This is a normal occurrence. The
thermostat may engage auxiliary heat during the
defrost cycle to satisfy a heating demand; however,
the unit will return to normal operation at the
conclusion of the defrost cycle.

EXTENDED POWER OUTAGE

The heat pump is equipped with a compressor crankcase
heater which protects the compressor from refrigerant
slugging during cold weather operation.

506270−01 05/09

Page 24

If power to your unit has been interrupted for several hours
or more, set the room thermostat selector to the
Emergency Heat setting to obtain temporary heat without
the risk of serious damage to the heat pump.

In emergency heat mode, all heating demand is satisfied
by auxiliary heat; heat pump operation is locked out. After a
six-hour compressor crankcase warm-up period, the
thermostat can be switched to the heat setting and normal
heat pump operation may resume.

THERMOSTAT OPERATION

Though your thermostat may vary somewhat from the
description below, its operation will be similar.

Temperature Setting Levers

Most heat pump thermostats have two temperature
selector levers: one for heating and one for cooling. Set the
levers or dials to the desired temperature setpoints for both
heating and cooling. Avoid frequent temperature
adjustment; turning the unit off and back on before
pressures equalize puts stress on the unit compressor.

Fan Switch

In AUTO or INT (intermittent) mode, the blower operates
only when the thermostat calls for heating or cooling. This
mode is generally preferred when humidity control is a
priority. The ON or CONT mode provides continuous
indoor blower operation, regardless of whether the
compressor or auxiliary heat are operating. This mode is
required when constant air circulation or filtering is desired.

System Switch

Set the system switch for heating, cooling or auto
operation. The auto mode allows the heat pump to
automatically switch from heating mode to cooling mode to
maintain predetermined comfort settings. Many heat
pump thermostats are also equipped with an emergency
heat mode which locks out heat pump operation and
provides temporary heat supplied by the auxiliary heat.

Indicating Light

Most heat pump thermostats have an amber light which
indicates when the heat pump is operating in the
emergency heat mode.

Temperature Indicator

The temperature indicator displays the actual room
temperature.

Programmable Thermostats

Your Lennox system may be controlled by a
programmable thermostat. These thermostats provide the
added feature of programmable time-of-day setpoints for
both heating and cooling. Refer to the user’s information
manual provided with your particular thermostat for
operation details.

Preservice Check

If your system fails to operate, check the following before
calling for service:

 Check to see that all electrical disconnect switches are

ON.

 Make sure the room thermostat temperature selector

is properly set.

 Make sure the room thermostat system switch is

properly set.

 Replace any blown fuses, or reset circuit breakers.
 Make sure unit access panels are in place.
 Make sure air filter is clean.
 Identify the unit model number before calling.

OPTIONAL ACCESSORIES

Refer to the Engineering Handbook for optional
accessories that may apply to this unit. The following may
or may not apply:

 Compressor crankcase heater
 Mounting bases
 Timed off control
 Stand−off kit
 Sound cover
 Low ambient kit
 Monitor kit
 SignatureStat room thermostat
 Loss of charge kit
 High pressure switch kit
 Mild weather kit
 Compressor monitor

Page 25

XP13 SERIES

Start−Up and Performance Checklist

Job Name Job no. Date

Job Location City State

Installer City State

Unit Model No. Serial No. Service Technician

Nameplate Voltage

Rated Load Ampacity Compressor Amperage:

Maximum Fuse or Circuit Breaker

Electrical Connections Tight?  Indoor Filter clean?  Supply Voltage (Unit Off)

Indoor Blower RPM S.P. Drop Over Indoor (Dry) Outdoor Coil Entering Air Temp.

Vapor Pressure;

Refrigerant Lines: Leak Checked?  Properly Insulated?  Outdoor Fan Checked? 

Service Valves: Fully Opened?  Caps Tight?  Voltage With Compressor Operating

SEQUENCE OF OPERATION

Heating Correct?  Cooling Correct? 

Calibrated? 

THERMOSTAT

Properly Set?  Level? 

506270−01 05/09

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