LENNOX Air Conditioner/heat Pump(outside Unit) Manual L0806534

User Manual: LENNOX LENNOX Air conditioner/heat pump(outside unit) Manual LENNOX Air conditioner/heat pump(outside unit) Owner's Manual, LENNOX Air conditioner/heat pump(outside unit) installation guides

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,t_2008

Lennox
Dallas,

,
industries
Texas,

INSTALLATION
INSTRUCTIONS

®
Inc,
USA

Elite ® Series XP13 Units
HEAT PUMPS
505,327M

_
j_jj

04108

Technical

Publications

Litho U.S.A.

Supersedes 03/08

RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE

WARNING

A CAUTION

A IMPORTANT

Shipping and Packing List ......................
XP13 Heat Pumps .............................
Unit Dimensions ...............................
General Information ...........................
Recovering Refrigerant from Existing System .....
Removing Existing Outdoor Unit .................
Positioning New Outdoor Unit ...................
Removing and Installing Panels .................
New or Replacement Line Set ...................
Brazing Connections ...........................
Removing Indoor Unit Metering Device ...........
Flushing the System ...........................
Installing New Indoor Unit Metering Device ........
Testing for Leaks ..............................
Evacuating the System .........................
Servicing Unit Delivered Void of Charge ...........
Electrical Connections .........................
Start-Up and Charging Procedures ...............
System Operation .............................
Defrost System ...............................
Maintenance ..................................
Homeowner Information ........................
Start-Up and Performance Checklist .............

1
1
2
3
5
5
6
7
9
10
11
12
13
13
15
15
15
17
17
21
22
22
24

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

A IMPORTANT

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.

04/08

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

Page 1

505,327M

IIIIIIIIIIIIIIIIIIIIIIIIIIIIII

RUN
CAPACITOR

DEFROST
BOARD

CONTACTOR

SUCTIONLINE
-CONNECTION

LIQUID LINE
CONNECTION

REVERSING
VALVE

HIGH PRESSURE

FILTER DRIER/
LIQUID LINE
CONNECTIONS

VAPOR LINE

VAPOR VALVE AND
GAUGE PORT/SUCTION
LINE CONNECTIONS

TOP VIEW
XP13 PARTS ARRANGEMENT

DISCHARGE

AIR

LIQUID LINE

C:=::::3 _
ELECTRICAL

VAPOR

LINE

2 (51)
4N/4(1
08)

4-3/4
(121)

SIDE VIEW
UNIT SUPPORT
FEET

UNIT

SUPPORT

1(25)

SIDE VIEW

FEET

\
8N/2

9N/2

(216)

(241)

13-7/8
(352)

20-5/8

(524)

8-3/4

8N/4

(222)

(210)

_l
4-1/2

(197)

(114)

13-1/2
(343)

3-1/4
3-5/8

(83)

(92)

XP13-018, 024, 030 AND 036 BASE SECTION
XP13

XP13 BASE WITH ELONGATED

-018
-024

31 (787)

27 (686)

28 (711)

31 (787)

27 (686)

28 (711)

-030

31 (787)

27 (686)

28 (711)

-036

27 (686)

28 (711)

-042
-048
-060

(889)

35 (889)

30-1/2

30-1/2 (775)

35 (889)

30-1/2 (775)

35 (889)

(889)

(1143)

Page 2
505327M

04/08

(775)

35 (889)

LEGS

WARNING

IMPORTANT

1/12 TURN

I_ TURN

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.

Figure 1. Cap Tightening

Distances

Xk IMPORTANT

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

Service valve cap

8 ft

Sheet metal screws

16 in

2 NM

Machine screws #10

28 in

3 NM

Compressor bolts

90 in

10 NM

Gauge port seal cap

8ft

To Access Angle Type Service Port:

Torque

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

11 NM

2 Connect gauge to the service port

11 NM

USING MANIFOLD GAUGE SETS
When checking the system charge only use a manifold
gauge set that features low loss antiblow back fittings
See figure 2 for a typical manifold gauge connection setup
Manifold gauge sets used with HFC410A 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

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 AngleType Service Valve:
A valve stem cap protects the valve
contamination and assures a leak free seal

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.

stem

from

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

DISTRIBUTOR

CBECK

REV_#s,_T:Uv_E
NOTE - ARROWS INDICATE
OF REFRIGERANT
FLOW.

_
_GAUGEM_,FOLD
_
,' ''--!,

INDOOR UNIT

Ill _'_

IIBFc-°_o
II b"

STRAP THE SUCTION
LINE TO
THE JOIST OR RAFTER AT 8 FEET
INTERVALS
THEN STRAP
THE
LIQUID LINE TO THE SUCTION

L,NE
__

- I I_1

Figure 15. Refrigerant Line Set: Installing
Horizontal Runs

Model (XP13) and size of unit (e.g. -060).

Page 9
XP13 SERIES

IMPORTANT
-REFRIGERANT
LINES
MUST
NOT
CONTACT
WALL.
LIQUID
LINE
OUTSIDE
WALL
SUCTION
LINE

_WARNING

NOTE
-SIMILAR
INSTALLATION
PRACTICES
SHOULD
BEUSED
IFLINE
SET
IS
TO
BE
INSTALLED
ONEXTERIOR
OFOUTSIDE
WALL.

,WARNING
WOOD
BLOCK
STRAP

;LEI
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.

SUCTION
LINE
WRAPPED
WITH
ARMAFLEX

2. Remove service cap and core from both the suction
and liquid line service ports.

UID
LINE IMPORTANT!
REFRIGERANT
LINES
MUST
NOT
CONTACT
STRUCTURE.

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.

PIPE FIBERGLASS
INSULATION
Figure 16. Refrigerant Line Set: Installing Vertical
Runs (New Construction
Shown)

WARNING

AUTOMOTIVE
MUFFLER-TYPE
HANGER

ANCHORED HEAVY NYLON
WIRE TIE OR AUTOMOTIVE
MUFFLER-TYPE
HANGER

WALL
STUD

STRAP

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.

LIQUID LINE

TO SUCTION

LINE

NOTE - The RFCIV or TXV metering device at the indoor
unit will allow low pressure nitrogen to flow through the
system.)

LIQUID LINE
METAL

SLEEVE

SUCTION

LINE - WRAPPED

ARMAFLEX

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.

Figure 17. Refrigerant Line Set: Transition from
Vertical to Horizontal

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.
Page 10
505327M

04/08

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.

i,_,,IP
REMOVE CAP AND CORE FROM
BOTH LIQUID AND SUCTION
SERVICE PORTS

CUT
AND
DEBUR

SERVICE PORT MUST BE
OPEN TO ALLOW EXIT
POINT FOR NITROGEN

INDOOR

SERVICE
VALVE

UNIT

UNIT
outdoor

LIQUID

LINE

SERVICEJ

VALVE

,4i
WRAP

INSTALL
CORE
ONLY
FOR
BOTH
SERVICE
PORTS
after
have
coolED.they

(

SER
VALVE

_Z£

Figure 18. Brazing Connections
7. After all connections have been brazed, disconnect
2. Remove any shipping clamps holding the liquid line
manifold gauge set the from service ports and remove
and distributor assembly.
wrapping. Reinstall the service port core for both of the
3. Using two wrenches, disconnect liquid line from liquid
outdoor unit's service valves.
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
Remove the existing HCFC-22 refrigerant flow control
figure 20.
orifice or thermal expansion valve from the indoor coil. The
5. Use a field-provided fitting to temporary reconnect the
existing indoor unit HCFC-22 metering device is not
liquid line to the indoor unit's liquid line orifice housing.
approved for use with HFC-410A refrigerant and may
prevent proper flushing.
DISTRIBUTOR
TUBES
REPLACEMENT

PARTS

LIQUID LINE ORIFICE

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

10 -- Brass nuts for liquid line assemblies

•

20 -- Teflon rings

•

10 -- Liquid line orifice housings

•

10 -- Liquid line assemblies
LIQUID

LINE ORIFICE

HOUSINGS

RINGS

(20)

(10)

BRASS

NUT

RETAINER
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)

VALVE STEM
CAP

(Uncased

Coil Shown)

Figure 20. Typical Fixed Orifice Removal
TYPICAL TXV REMOVAL PROCEDURE

LINE ASSEMBLIES
STRAINER)

AND DISCARD

VALVE STEM ASSEMBLY

PISTON

(10)

VALVE STEM

(INCLUDES

REMOVE

/OR,F,?
./(,FPRESENT,

iRASS
NUTS
(10,
LIQUID

RING

FIXED

D,S& ,B2TOR..
"'
__

TEFLON

HOUSING

LIQUID LINE
ASSEMBLY

1. On fully cased coils, remove the coil access and
plumbing panels.

Figure 19. 69J46 Kit Components

2. Remove any shipping clamps holding the liquid line
and distributor assembly.

TYPICAL FIXED ORIFICE REMOVAL PROCEDURE
1. On fully cased coils, remove the coil access and
plumbing panels.

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

Page 11
XP13 SERIES

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

A IMPORTANT

5, Disconnect the liquid line from the TXV at the liquid line
assembly,
TWOPIECE (Uncased Coil Shown)
PATCH PLATE
(UNCASED COIL
ONLY

STUB END
LIQUID LINE
ORIFICE HOUSING

DISTRIBUTOR
TUBES

SENSING
LINE

If the original system used:
•
•

MALE EQUALIZER
FITTING

LINE

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.

/
/

J
SUCTION
SENSING BULB
LINE

CONTAINS CLEAN HCFC-22
BE USED FOR FLUSHING
_(

LIQUID
LINE

INVERTED

HCFC-22

SUCTION
SERVICE

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

GAUGE
MANIFOLD

CYLINDER

LOW
PRESSURE

#
hI

Figure 21. Typical TXV Removal

HIGH
PRESSURE

LINE
VALVE

CLOSED

EXISTING
OOR

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

LIQUID

LINE SERVICE

VALVE

RECOVERY
CYLINDER

8, Use a field-provided fitting to temporary reconnect the
liquid line to the indoor unit's liquid line orifice housing,

RECOVERY

MACHINE

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

IMPORTANT

Figure 22. Typical Flushing

Connection

REQUIRED EQUIPMENT
Equipment required to flush the existing line set and indoor
unit coil:

Xk CAUTION

•

Two clean HCFC-22 recovery bottles,

•

Oilless recovery machine with pump-down feature,

•

Two gauge sets (one
HFC-410A),
FLUSHING PROCEDURE
1, Connect the following:

A IMPORTANT

for

HCFC-22;

one

for

•

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
Page 12
505327M

04/08

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,

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,
TWO
PIECE

(Uncased Coil Shown)

PATCH PLATE
UNCASED COIL
ONLY)

LIQUID LINE
HOUSING

DISTRIBUTOR
TUBES.

._ORI

FIC E

STUB

CTXV

END

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

1/2 TURN

MALE EQUALIZER
LINE
FITTING (SEE FIGURE 26
FOR FURTHER

SUCTION
LINE
LIQUID
LINE

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

Figure 23. Tightening

Distance

TYPICAL CTXV INSTALLATION PROCEDURE
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,

Figure 24. Typical

TXV Installation

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

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
and expose surface of the Teflon ring with refrigerant
oil,

SUCTION
I' '_,,,,-

THAN
BULB
OR 9

/
BULB
\

SUCTION

LINE
ON 7/8" AND LARGER LINES,
MOUNT
SENSING
BULB AT

_--,_--"_:",..,_
'_ >.,,
,,'_,%_ "
,.
__

_'.1,_"
Y
(BULB

NOTE

5, Attach the liquid line assembly to the CTXV. Finger
tighten and use an appropriately sized wrench to turn

ON LINES SMALLER
7/8", MOUNT SENSING
AT EITHER
THE
3
O'CLOCK POSITION.

LINE

POSITION.
NEVER
MOUNT
ON BOTTOM OF LINE.
EITHER THE 4 OR 8 O'CLOCK

"_.\\_

}'_L

- NEVER

MOUNT

Y
j_

_X/
BULB)

BOTTOM

Figure 25. TXV Sensing

LINE.

Bulb Installation

Page 13
XP13 SERIES

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

After the line set has been con nected 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

WARNING
FLARE SEAL
CAP

LARE NUT
COPPER

BONNET

J
MALE BRASS

EQUALIZER

WARNING
_

LINE FITTING
SUCTION
LINE

Figure 26. Copper Flare Seal Bonnet Removal
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.

WARNING

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 Handbookforapproved
kit match-ups and application information,

CTXV

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

AND NUTS (2)

@ TEPLON
COPPER
MOUNTING
RINGS (2)
/%
STRAP (1)

Figure 27. CTXV Kit Components
Page 14
505327M

04/08

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,

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,

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
ports,

gauges from service

8. Reconnect the manifold gauge to the vacuum pump,
turn the pump on, and continue to evacuate the line set
and indoor unit until the absolute pressure does not
rise above 500 microns (29.9 inches of mercury) within
a 20-minute period after shutting off the vacuum pump
and closing the manifold gauge valves.
9, When the absolute pressure requirement above has
been met, disconnect the manifold hose from the
vacuum pump and connect it to an upright cylinder d
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.

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,

Xk WARNING

10, Close manifold gauge valves and shut off the
HFC-410A cylinder and remove the manifold gauge
set,

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

A IMPORTANT

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.

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,

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,

Page 15
XP13 SERIES

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.

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,

WARNING

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.)

THERMOSTAT

J!
20B-ZSO/_I

Wire run length

AWG #

Insulation type

less than 100' (30m)

color-coded,

more than 100' (30m)

rating 35°C minimum

temperature
LINE VOLTAGE
FIELD
INSTALLED

NOTE - Units are approved for use only with copper
conductors. Refer to figure 28 for high voltage field wiring
diagram. (A complete unit wiring diagram is located inside
the unit control box cover.)

WARNING!

DUAL

BLACK

BLACK
BLACK

ORANGE

Figure 28. Typical Field Wiring
DESCRIPTION
(EY
COMPONENT
_I
COMPRESSOR
Be
MOTOR-0UTD00R FAN
CI2 CAPACITORDUAL
:MCI CONTROL-DEFROST
_R_.]_IHEATER-COMPRESSOR
(I.-ICONTACTOR-COMPRESSOR
.I
VALVE-REVERSING
;4
SWlTCH-HIGHPRESSURE
$6
S_ITCH-DEFROST
_€0 THERNGGTAT-CRANKCASE
_87 SWITCH-LOW PRESSURE

CONTROL

FAN

THERMOSTAT

r- --

RED

F---

BLACK

L_Ow

L0-PS

COMPRESSOR
CRANKCASE

A
NOTEFOR USE WITH COPPER CONOUCTORS
ONLY.REFER
TO UNIT RATING
PLATE FOR MINIMUM CIRCUIT
AMPACITY AND MAXIMUM OVERCURRENT PROTECTION
SIZE.

YI_OUT

HEATER

HI-PS

208-250160/I

i_tr-

;

I II
Ill
----J
ii

GROUND
LUG

L2
LI

I_'GROUND

CONNECTION
MUST
OPTIONAL SWITCH

__J

!F'_---'_REVERSING
_VALVE

OMCI
FAN

OUT

IL_

Ill I
IPRESSURE

III
II I

ZOB-ZSO/60/I

[

LO-PS

_LINE
FIELD
I

COMMON
Y_OUT

-J

PRESSURE

RI-PS

Figure 29. Typical Wiring Diagram

Page 16
505327M

04/08

WHEN

CODES.

DENOTES OPTIONAL
COMPONENTS

HI-PS
EOUIPMENT

BE JUMPERED
IS NOT USED

WARNINGELECTRIC SHOCK HAZARD,
CAN CAUSE INJURY OR
DEATN_ UNIT MUST BE
GROUNDED
IN ACCORDANCE
WITH NATIONAL AND LOCAL

I
DEFROST_
THERMOSTAT

LZ_-

VOLTAGE
INSTALLED

z_NOTE
- For use with copper conductors only. Refer to unit
rating plate for minimum circuit ampacity and maximum overcurrent protection size.

DEFROST

CAPACITOR

_OLASS
FIELD

- ELECTRIC SHOCK HAZARD. Can cause INJU-

OUTDOOR

!I?JPURPLE

RY or DEATH, Unit must be grounded in accordance with
national and local codes.

NOTE - For proper voltages, select thermostat wire gauge
oer the following chart:

FAN

VOLTAGE
INSTALLED

CLASS II VOLTAGE
FIELD INSTALLED

THERMOSTAT INDOORUNIT OUTDOOR

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,

UNIT

®1
©1
24V
POWER
@1

24V
POWER
COMMON_r__
1ST-STAGE
_
_L
AUXILIARY
HEAT 'L. @1
_L

COMMON

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.

1ST_STAGE

AUXILIARYHEAT

@1
--

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

INDOOR

BLOWER

REVERSING

VALVE

COMPRESSOR

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,
SETTING UP TO CHECK CHARGE

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

Figure 30. Outdoor and Blower Unit Thermostat
Designations
THERMOSTAT

INDOOR

UNIT

OUTDOOR

UNIT

®+

\ "-,
"'.

AUXILIARY
HEAT

INDOOR

BLOWER

REVERSING

@
®

• high pressure gauge to liquid service port
1 ST-STAG E
AUXILIARY
HEAT

®
@

COMPRESSOR

THERMOSTAT

COOLING MODE INDOOR AIRFLOW

CHECK

Check airflow using the Delta-T (DT) process using the
illustration in figure 32,

(SOME CONNECTIONS

OUTDOOR
_ THERMOSTAT
HEAT RELAY

VALVE

SPECIFIC

EMERGENCY

"-//_[--

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

EMERGENCY
HEAT

@4 ,ST
STAGE
k@"
®4
@4

24V POWER
\ COMMON

HEATING MODE INDOOR AIRFLOW

Blower airflow (CFM) may be calculated
electric heat and measuring:

MAY NOT APPLY. REFER_O
AND INDOOR

CHECK

UNIT.)

Figure 31. Outdoor and Blower Unit Thermostat
Designations (with emergency heat)

by energizing

•

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:

IMPORTANT

Amps x Volts x 3.41
CFM =

1, Rotate fan to check for binding.
2, Inspect all factory- and field-installed wiring for loose
connections.

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:

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,

Amount
specified
on
nameplate
+

Adjust amount, for
variation in line set
length listed on table
in figure 33.

Additional charge
specified per
indoor unit
match-up listed in
tables 3 through 9.

Total
charge

Page 17
XP13 SERIES

Temp.
I DT
ofair
180
entering,._J78
indoor _ I _
coilOF _jru

24
23
_
_
21
20
19

_174

m
_72
_70

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).

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
21
20
19

22
21
19
18

21
20
18
18

21 20 19 19 18 17 16 15
19 19 18 17 16 16 15 14
17 17 16Z_15
14 13 12
17 17 16 15 15 14 13 12

14
15
11
11

13
12
10
10

2. Find temperature drop across ceil--Measure
the coil's dry bulb
entering and leaving air temperatures (A and C). Temperature Drop
Formula: (TDrop) = A minus C.
3. Determine if fan needs adjustment--If
the difference between
the measured TDrop and the desired DT (TDropi])T)
is within ±3 °, no
adjustment is needed. See examples: Assume DT = 15 and A temp.
= 72 °, these C temperatures would necessitate stated actions:

Wet-bulb °F 57 58 59 60 61 62 63 64 65 66 67 68 69 70 J

C°
53 °

,0o
All temperatures
expressed
in °F

INDOOR

are
COIL

58 °
62 °

DRY
BULB

Liquid

Line

Set Diameter
3/8" (9.5 mm)

ACTION
Increase the airflow

14
10

15
15

=
=

-1
-5

(within +3 ° range) no change
Decrease the airflow

indoor unit instructions to increase/

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

Indoor Coil Airflow Guide
LENNOX

1. Check Liquid and suction line pressures

't,__,_7_!_ _'_

2. Compare unit pressures with Table 10,
Normal Operating Pressures.
3. Conduct
leak check;
previously outlined.

evacuate

4. Weigh in the unit nameplate charge plus
any charge required for line set differences
over feet,

per 5 feet (g per 1.5 m)

from

3 ounce

°F
4

per Line Set Length

Ounces
adjust

=
=

WET

WEIGH
Charge

DT
15

4. Adjust the fan speed--See
decrease fan speed.

BULB

Figure 32. Checking

Refrigerant

TDrop-

15 feet (4.6 m) line set*

M@ululJ

per 5' (85 g per 1.5 m)

NOTE - *If
line length
length isis less
greater
ft. (4.6
m), add this
this
amount.
If line
than than
15 ft.15(4.6
m), subtract
amount.

This nameplate is for illustration purposes
only. Go to actual nameplate on outdoor
unit for charge information.

Figure 33. Using Weigh In Method
1

SUBCOOUNG2

USE COOLING
MODE

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,)
Measure outdoor ambient temperature;
check charge,

determine whether to use cooling

mode or heating

mode to

Connect gauge set,

Check Liquid and Vapor line pressures. Compare pressures with Normal Operating Pressures table 10,
(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.

60°F (15 °) -USE HEATING
MODE

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;

Read the liquid line pressure; then find its corresponding
listed in table 11 and record it in the SAT ° space.

LIQ o -

Subtract LIQ ° temp. from SAT ° temp. to determine subcooling; record it in SC ° space.

SC o

Compare SC ° results with table below, being sure to note any additional charge for line set and/or match-up.

SAT o
=

record in the LIQ ° space.
temperature

in the temperature/pressure

chart

10 If subcooling value is greater than shown in tables 3 through 10 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 34. Using Subcooling
Page 18
505327M

04/08

Method

Table 3. XP13-018
INDOOR

Target
Subcooling
Heat
Cool
(+5OF)
(+1OF)
25
5

MATCHUPS

CBX26UH-018

INDOOR

*Add charge
Ib
1

oz
1

Target
Subcooling
Heat
Cool
{±5OF)
{±1OF)

MATCHUPS

*Add charge
Ib

CBX26UH-024

CH33 31A
CH33-31B

10
10

5
5

0
1

2
0

CBX27UH-018/024
CBX32MV-018/024

15
30

8
3

0
0

2
0

CH33-36C
CH33_42

10
10

4
11

0
2

0
3

CBX32MV-024/030

CH33-44,

Table 4. XP13-024
INDOOR

Target
Subcooling
Heat
Cool
{±5OF)
(±1OF)

MATCHUPS

*Add charge

CR33-36
CR33_48

-48

10
30

4
5

0
2

1
3

CR33-50/60
CX34-38 SN# 6007K and after

30
5

11
5

2
2

5
2

CX34 38 before SN# 6007K
CX34-44/48

10
10

5
5

2
2

CBX26UH-024

CBX26UH-030
CBX27UH-018/024

26
12

3
3

1
0

3
11

CBX27UH-030

CBX32M-030
CBX32M-036

12
12

3
3

0
1

11
4

INDOOR

12
12

6
3

0
0

5
11

CH23 65
CBX26UH-042

32
32

6
6

0
1

12
2

CH33-25A
CH33 31A

16
12

6
3

0
0

7
7

CBX26UHq348

CH33

31B

CBX27UH-042
CBX27UH-048

15
15

5
5

0
0

CH33-36A
CH33 36B

16
16

6
7

0
0

7
15

CH33

CBX32MV
CH33-43B

15
10

5
12

0
4

0
8

CR33-30, -36
CX34 25

12
12

4
6

0
0

3
5

CH33_43C
CH33_44

10
10

6
6

1
0

1
16

CX34 31
CX34-36

12
16

3
7

0
0

11
11

CH33-48
CH33_49C

10
10

6
12

1
3

1
12

CR33_48

CR33-50/60
CX34 43

32
10

9
6

2
1

6
1

CX34 49
CX34-50/60

10
10

12
6

3
1

7
1

CBX32MV
CBX32MV

018/024
024/030

36C

Table 7. XP13-042

CBX32Mq336,

Table 5. XP13-030
INDOOR

Target
Subcooling
Heat
Cool
{±5OF)
{±1OF)

MATCHUPS

CBX26UH-030,
CBX27UH-030

-036

*Add charge
Ib

25
15

4
4

0
0

11
11

15
15

4
4

0
0

11
11

15
20

4
3

0
0

11
8

CH33-31A

CH33-31B
CH33 36A

20
20

4
3

CH33-36C
CH33-42B

15
20

CBX27UH-036
CBX32M 030,
CBX32M-042

036

MATCHUPS

CX34

042

036

Target
Subcooling
Heat
Cool
(±5OF)
{±1OF)

*Add charge

Table 8. XP13-048
INDOOR

MATCHUPS

Target
Subcooling
Heat
Cool
{±5OF)
{±1OF)

*Add charge
Ib

CBX26UH-048
CBX26UHq360

10
5

11
12

0
3

8
8

0
0

11
8

CBX27UH-048
CBX27UH-060

10
10

9
9

0
0

7
7

3
4

0
0

11
11

CBX32M-048
CBX32MV-048

10
10

9
9

0
0

7
7

15
15

4
3

0
0

11
12

C33-43

CX34-31

CX34 36
CX34-38 SN# 6007K and after

27
4

2
4

0
0

CX34-38 before SN# 6007K
CX34_42

20
27

4
2

0
0

CBX32MV-024/030,
CH33 25A

CR33 30,
CX34-25

-036

CH33_43C
CH33-49C

13
10

4
9

0
0

3
7

0
11

CH33-60

CR33_48

11
0

CR33-50/60,
CX34-60

35
10

7
7

0
0

5
5

-60

Table 9. XP13-060

Table 6. XP13-036
INDOOR

Target
Subcooling
Heat
Cool
{±5OF)
(±1OF)

MATCHUPS

*Add charge
INDOOR
Ib

25
10

5
5

2
2

CBX27UH-042

*Amount

042

of charge

10
10

required

nameplate. (Remember

in additional

5
5

to charge

2
2

shown

to consider line set length difference.)

2
2

on unit

Target
Subcooling
Heat
Cool
(±5OF)
(±1OF)

*Add charge
Ib

CBX26UH-060
CBX27UH-060

10
10

9
8

3
1

3
12

CBX32MV

CBX26UH-036
CBX27UH-036
CBX32M 036,
CBX32MV-036

MATCHUPS

CBX32MV-068
CH33 62

060

10
10

9
9

2
2

5
7

CR33

CX34-60
CX34 62

15
10

4
9

0
2

0
1

Page 19
XP13 SERIES

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

IMPORTANT

Mode,tLiquid
-018Line Pressure
b024
L-030
/ Vapor Line Pressure

L.038

°F (°C)**

1.042

1.048

j.080

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

331 / 130

341 / 126

361 / 112

376/118

350/124

370/127

50 (10}

328/116

315/109

324/107

331 / 106

355/107

323/106

348/105

40 (4.5}

310 / 96

299 / 89

307 / 88

304 / 96

336 / 89

294 / 92

328 / 85

30 (-1)

294 / 81

283 / 72

294 / 72

295 / 77

325 / 74

291 / 73

317 / 72

20 (-7)

278 / 67

267 / 55

278 / 55

285 / 57

309 / 60

277 / 59

*These

are most-popular-match-up

**Temperature

of the air entering

pressures.
the outdoor

Indoor

match

up, indoor

air quafity,

and indoor

load cause

pressures

305 / 59
to var_

coil.

Table 11. HFC-410A Temperature

(°F) - Pressure

(Psig)

°F

Psig

°F

Psig

°F

Psig

°F

Psig

°F

Psig

°F

Psig

°F

Psig

°F

Psig

100.8

137.1

178.5

231.6

290.8

110

365.0

125

445.9

141

545.6

102.9

139.6

181.6

235.3

295.1

111

370.0

126

451.8

142

552.3

105.0

142.2

184.3

239.0

299.4

112

375.1

127

457.6

143

559.1

107.1

144.8

187.7

242.7

303.8

113

380.2

128

463.5

144

565.9

109.2

147.4

190.9

246.5

308.2

114

385.4

129

469.5

145

572.8

111.4

150.1

194.1

250.3

312.7

115

390.7

130

475.6

146

579.8

113.6

152.8

197.3

254.1

100

317.2

116

396.0

131

481.6

147

586.8

115.8

155.5

200.6

258.0

101

321.8

117

401.3

132

487.8

148

593.8

118.0

158.2

203.9

262.0

102

326.4

118

406.7

133

494.0

149

601.0

120.3

161.0

207.2

266.0

103

331.0

119

412.2

134

500.2

150

608.1

122.6

163.9

210.6

270.0

104

335.7

120

417.7

135

506.5

151

615.4

125.0

166.7

214.0

274.1

105

340.5

121

423.2

136

512.9

152

622.7

127.3

169.6

217.4

278.2

106

345.3

122

428.8

137

519.3

153

630.1

129.7

172.6

220.9

282.3

107

350.1

123

434.5

138

525.8

154

637.5

132.2

175.4

224.4

286.5

108

355.0

124

440.2

139

532.4

155

645.0

134.6

228.0

109

360.0

140

539.0

Page 20
505327M

04/08

INSTALLING

DEFROST THERMOSTAT

SERVICE VALVE CAPS

Disconnect gauge set and re-install both the liquid and
suction service valve caps,

INSTALL
OUTDOOR
UNIT
SERVICE
VALVES

CAPS

Figure 35. Installing Service Valve Caps

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.

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.

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

The unit is equipped with a large-capacity bifiow 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,

The XP13 defrost system includes two components: a
defrost thermostat and a defrost control board (figure 36).

FAN

OBSl
ODS_

DIAGNOSTIC
LEDS

COMPRESSOR
DELAY PINS

HEAT (AMBER LIGHT)

FILTER DRIER

TEST
PINS

REVERSING
VALVE

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.

PIo

FIELD SELECT
TIMING PINS

0-O{_T

24V TERMINAL
STRIP
CONNECTIONS
LOW PRESSURE
SWITCH
DEFROST
THERMOSTAT

j
¥I-0UT

o
HIGH PRESSURE
SWITCH

I,;,W;,t;q q J;,IP__)

Figure 36. Outdoor Unit Defrost Control
DEFROST CONTROL TIMING PINS

Board

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 36), 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

Page 21
XP13 SERIES

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
when jumpering the TEST pins.
TIME DELAY

NOTE - The defrost control board ignores input from the
low-pressure switch terminals as follows:
• during the TESTmode,
•

during the defrost cycle,

•

during the 90-second start-up period,

•

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.

WARNING

feature is ignored

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 36). The board also includes a low pressure, or
loss-of-charge-pressure,
switch (S87). Switches are
shown in wiring diagrams in figures 29 and 36.
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 12. 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 12. 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

OFF
Simultaneous

OFF
Slow FLASH

Alternating Slow FLASH

Low pressure
switch fault

OFF

Slow FLASH

Low pressure
switch lockout

OFF

High pressure
switch fault

Slow FLASH

OFF

High pressure
switch lockout

OFF

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.
•

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.
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.

Page 22
505327M

04/08

Inspect and clean the outdoor and indoor coils. The
outdoor coil may be flushed with a water hose.

When removing debris from around the unit, be aware
of metal edges on parts and screws. Although special
care has been taken to keep exposed edges to a
minimum, physical contact with metal edges and
corners while applying excessive force or rapid motion
can result in personal injury.

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
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

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.)

A IMPORTANT

Cleaning of the outdoor unit's coil should be performed
by a trained service technician. Contact your dealer
and set up a schedule (preferably twice a year, but at
least once a year) to inspect and service your air
conditioning or heat pump system.
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.
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

6. Outdoor Unit--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.

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.

Page 23
XP13 SERIES

Fan Switch

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,

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.

•

Make sure the room thermostat temperature selector
is properly set.

•

Make sure the room thermostat
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,

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,

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

Indicating Light

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

•

Compressor crankcase heater

•
•

Mounting bases
Timed off control

Temperature

•

Stand-off kit

•

Sound cover

Indicator

The temperature
temperature,

indicator

displays

the actual

system switch is

room

•

Low ambient kit

Programmable Thermostats

•

Monitor kit

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.

•

SignatureStat'"

•

Loss of charge kit

•
•

High pressure switch kit
Mild weather kit

•

Compressor monitor

room thermostat

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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 Blower RPM

Indoor Filter clean?

S.P. Drop Over Indoor (Dry)

Supply Voltage (Unit Off)
Outdoor Coil Entering Air Temp.

Vapor Pressure;
Refrigerant Lines: - Leak Checked?

Properly Insulated?

Outdoor Fan Checked?

Service Valves:

Caps Tight?

Voltage With Compressor Operating

---

Fully Opened?

SEQUENCE
Heating Correct?

OF OPERATION

THERMOSTAT
Calibrated? _

Cooling Correct?

Page 24
505327M

04/08

Properly Set? _

Level?

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Producer                        : Goby Monitor Application version 4, 0, 0, 13
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LENNOX Air Conditioner/heat Pump(outside Unit) Manual L0806534

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