Lennox TSA S4 Series User manual

Page 1
Corp. 0922−L10 TSA*S4
Service Literature 10−2009 M and T Voltages
T−CLASSt
TSA*S4  M and T Voltage Units
WARNING
Improperinstallation, adjustment, alteration, service or maintenance can
cause personal injury, loss of life, or damage to property.
Installation and service must be performed by a licensed professional
installer (or equivalent) or a service agency.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of refrigerant
(CFCs, HCFCs AND HFCs) as of July 1, 1992. Approved methods of
recovery, recycling or reclaiming must be followed. Fines and/or
incarcerationmay be levied for noncompliance.
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.
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.
TABLE OF CONTENTS
Specifications and Electrical Data 2. . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Control Panel Parts Arrangement 4. . . . . . . . . . .
Typical Unit Parts Arrangement 5. . . . . . . . . . . . . . . . . . .
Model Number Identification 5. . . . . . . . . . . . . . . . . . . . . .
Unit Components 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Information 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Gauge Set and Service Valves 8. . . . . . . . . . .
Recovering Refrigerant from Existing System 10. . . . . .
New Outdoor Unit Placement 11. . . . . . . . . . . . . . . . . . . .
New or Replacement Line Set 12. . . . . . . . . . . . . . . . . . . .
Metering Devices and Flushing the System 15. . . . . . . .
Testing for Leaks 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evacuating the System 17. . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Connections 18. . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Unit Delivered Void of Charge 22. . . . . . . . . . .
Unit Start−Up 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Refrigerant 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Operation 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start−Up and Performance Checklist 28. . . . . . . . . . . . . .
The TSA*S4 is a commercial split-system condensing
unit with SEER ratings up to 14.80.
All major components (indoor blower and coil) must be
matched according to Lennox recommendations for the
compressor to be covered under warranty. Refer to the
Engineering Handbook for approved system matchups.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are
subject to change. This manual is divided into sections
which discuss the major components, refrigerant
system, charging procedure, maintenance and
operation sequence.
IMPORTANT
This model is designed for use in expansion valve systems only. An
indoor expansion valve approved for use with HFC−410A refrigerant
must be ordered separately, and installed prior to operating the system.

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Specifications and Electrical Data
ONE PHASE
General
Data Model No. TSA024S4 TSA030S4 TSA036S4 TSA048S4 TSA060S4
Nominal kW (tonnage) 7.0 (2) 8.8 (2.5) 10.5 (3) 14.1 (4) 17.6 (5)
Connections
(sweat) Liquid line o.d. − in. 3/8 3/8 3/8 3/8 3/8
Suction line o.d. − in. 3/4 3/4 7/8 7/8 1−1/8
1Refrigerant (R−410A) furnished 1.98 kg
(4 lbs. 6 oz.)
1.93 kg
(4 lbs. 4 oz.)
2.89 kg
(6 lbs. 6 oz.)
3.40 kg
(7 lbs. 8 oz.)
4.54 kg
(10 lbs.)
Outdoor
Coil
Net face area
m2(sq. ft.) Outer coil 1.05 (11.33) 1.23 (13.22) 1.52 (16.33) 1.95 (21.0) 1.73 (18.67)
Inner coil − − − − − − − − − − − − 1.67 (17.96)
Tube diameter − in. 5/16 5/16 5/16 5/16 5/16
Number of rows 1 1 1 1 2
Fins per meter (per inch) 1024 (26) 1024 (26) 1024 (26) 1024 (26) 866 (22)
Outdoor
Fan Diameter − mm. 457 (18) 457 (18) 559 (24) 559 (24) 559 (24)
Number of blades 3 4 4 4 4
Motor W (hp) 75 (1/10) 150 (1/5) 185 (1/4) 185 (1/4) 185 (1/4)
L/s (cfm) 924 (1958) 944 (2000) 1377 (2917) 1443 (3058) 1416 (3000)
Rev/min 842 908 688 696 692
Watts 138 154 250 246 238
Shipping Data − kg (lb.) 1 package 56 (123) 60 (133) 81 (178) 88 (194) 99 (218)
Electrical Data
Line voltage data − 50 hz − 1 phase 220 / 240V 220 / 240V 220 / 240V 220 / 240V 220 / 240V
2Maximum overcurrent protection (amps) 25 25 35 35 45
3Minimum circuit ampacity 14.3 16.9 21.7 21.6 26.9
Compressor Rated load amps 10.9 12.2 16.0 15.9 20.2
Locked rotor amps 60.0 67.0 87.0 98.0 128.0
Condenser
Fan Motor Full load amps 0.7 1.1 1.7 1.7 1.7
Locked rotor amps 1.4 2.0 3.1 3.1 3.1
NOTE − Extremes of operating range are plus 10% and minus 5% of line voltage.
1Refrigerant charge sufficient for 4.6 m (15 ft.) length of refrigerant lines.
2Heating Air Conditioning and Refrigeration type circuit breaker or fuse.
3Refer to local codes to determine wire, fuse and disconnect size requirements.

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THREE PHASE
General
Data Model No. TSA036S4 TSA048S4 TSA060S4
Nominal kW (tonnage) 10.6 (3) 14.0 (4) 17.6 (5)
Connections
(sweat) Liquid line o.d. − in. 3/8 3/8 3/8
Suction line o.d. − in. 7/8 7/8 1−1/8
1Refrigerant (R−410A) furnished 2.52 kg (5 lbs. 9 oz.) 3.40 kg (7 lbs. 8 oz.) 4.54 kg (10 lbs.)
Outdoor
Coil
Net face area
m2(sq. ft.) Outer coil 1.23 (13.22) 1.95 (21.00) 1.73 (18.67)
Inner coil − − − − − − 1.67 (17.96)
Tube diameter − in. 5/16 5/16 5/16
Number of rows 1 1 2
Fins per meter (per inch) 1024 (26) 1024 (26) 866 (22)
Outdoor
Fan Diameter − mm (in.). 457 (18) 559 (22) 559 (22)
Number of blades 4 4 4
Motor W (hp) 125 (1/6) 185 (1/4) 185 (1/4)
L/s (cfm) 944 (2000) 1443 (3058) 1416 (3000)
Rev/min 908 688 692
Watts 154 246 238
Shipping Data − kg (lb) 1 package 61 (135) 88 (194) 99 (218)
Electrical Data
Line voltage data − 50 hz − 3−phase 380 / 420V 380 / 420V 380 / 420V
2Maximum overcurrent protection (amps) 10 15 20
3Minimum circuit ampacity 8.0 10.7 14.2
Compressor Rated load amps 6.0 7.8 10.6
Locked rotor amps 46.0 51.5 74.0
Condenser
Fan Motor Full load amps 0.55 1.0 1.0
Locked rotor amps 1.1 2.3 2.3
NOTE − Extremes of operating range are plus 10% and minus 5% of line voltage.
1Refrigerant charge sufficient for 4.6 m (15 ft.) length of refrigerant lines.
2Heating Air Conditioning and Refrigeration type circuit breaker or fuse.
3Refer to local codes to determine wire, fuse and disconnect size requirements.
OPTIONAL ACCESSORIES − must be ordered separately
For update−to−date information, see any of the following publications:
Lennox TSA*S4 Engineering Handbook
Lennox Commerical Price Book

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Unit Dimensions −− Inches (mm)
SUCTION AND LIQUID LINE
CONNECTIONS
VIEW
OUTDOOR COIL FAN
A
B
A
OPTIONAL UNIT STAND-OFF KIT
(4) (FIELD−INSTALLED)
Discharge Air
SIDE VIEW
COMPRESSOR
Model Number A B
TSA024S4N41Tand M 24−1/4 (616) 25−1/4 (641)
TSA030S4N41T and M 24−1/4 (616) 29−1/4 (743)
TSA036S4N41M 28−1/4 (724) 29−1/4 (743)
TSA036S4N41T 24−1/4 (616) 29−1/4 (743)
TSA048S4N41T and M 28−1/4 (724) 37−1/4 (925)
TSA060S4N41T and M 28−1/4 (724) 33−1/4 (845)
Typical Control Panel Parts Arrangement
GROUND LUG
CONTROL
CAPACITOR (C12)
CONTROL WIRE LOOP
CUTOUT FOR HIGH
VOLTAGE CONDUIT
THREE
PHASE
ONE
PHASE
OR
CONTACTOR LOCATION
ONE POLE
THREE-
POLE

Page 5
Typical Unit Parts Arrangement
COMPRESSOR
HARNESS
LIQUID LINE SERVICE VALVE
SUCTION LINE SERVICE VALVE
OUTDOOR COIL
DISCHARGE LINE
HIGH PRESSURE SWITCH (S4)
COMPRESS0R
NOTE: PLUMBING LAYOUT MAY VARY SLIGHTLY BETWEEN
MODEL SIZES.
Model Number Identification
TSA M1036 S 44 N
Major Design Sequence
A = 1st Generation
B = 2nd Generation
Brand/Family
T = T−ClassProduct Line
Unit Type
S = Split−System Air Conditioner
024 = 2 Tons
030 = 2.5 Tons
0036 = 3 Tons
048 = 4 Tons
060 = 5Tons
Cooling Efficiency
S = Standard Efficiency
Minor Design Sequence
1 = 1st Revision
2 = 2nd Revision
3 = 3rd Revision
Voltage
M = 380/420V−3 phase 50hz
T = 220/240V−1 phase 50hz
Refrigerant Type
4 = R−410A
Part Load Capability
N = No part load, single stage compressor
Coil Type
4 = Four−sided

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Unit Components
CONTROL BOX
TSA*S4 units are not equipped with a 24V transformer. All
24 VAC controls are powered by the indoor unit. Refer to
wiring diagram.
Electrical openings are provided under the control box
cover. Field thermostat wiring is made to color-coded
pigtail connections.
COMPRESSOR CONTACTOR K1
The compressor is energized by a contactor located in the
control box as illustated on Page 4. One or three−pole
contactors are used in this model. K1 is energized by the
indoor thermostat terminal Y1 (24V) when thermostat
demand is present.
CONDENSER FAN MOTOR B4 AND CAPACITOR C1
This model use a one−phase PSC fan motors which require a
run capacitor C1 located in the control box. Ratings for
C1 will be on fan motor nameplate. In all units, the
condenser fan is controlled by the compressor
contactor.
ELECTRICAL DATA tables in this manual show
specifications for condenser fans used in this model.
Access to the condenser fan motor on all units is gained
by removing the seven screws securing the fan
assembly as illustrated in Figure 1. The condenser fan
motor is removed from the fan guard by removing the
four nuts found on the top panel. Drip loops should be
used in wiring when servicing motor. See Figure 1 if
condenser fan motor replacement is necessary.
FAN
Remove (7) screws
REMOVE (7) SCREWS
SECURING FAN GUARD.
REMOVE FAN GUARD/FAN AS-
SEMBLY.
MOTOR
FAN GUARD
WIRING
RACEWAY
Remove (4) nuts
Figure 1. Condenser Fan Motor and Compressor
Access
ALIGN FAN HUB FLUSH WITH END OF SHAFT
Figure 2. Fan Hub Alignment.
HIGH PRESSURE SWITCH S4
The manual−reset high pressure switch is located in the
liquid line. When liquid line pressure exceeds the factory
setting of 590 + 10 psi, the switch opens and shuts off the
compressor.
LOSS OF CHARGE SWITCH S24 (FIELD
INSTALLED OPTION)
The loss of charge switch is N.C. auto re−set and located
on the liquid line of the compressor. The switch opens
when liquid line pressure drops to 25 + 5 psig and shuts off
the compressor. The switch closes on a pressure rise at 55
+ 5 psig. The settings are factory set and cannot be
adjusted.
CRANKCASE HEATER HR1 AND OPTIONAL
THERMOSTAT S40
Crankcase heater HR1 prevents liquid from accumulating
in the compressor. HR1 is controlled by optional crankcase
heater thermostat S40, located on the liquid line. When
liquid line temperature drops below 50° F, S40 closes
energizing HR1. S40 opens when liquid line temperature
reaches 70°.
DRIER
A filter drier designed for all TSA4*S4 model units is
located in the liquid line. The field installed drier is designed
to remove moisture, which can lead to compressor failure.
Any time unit is exposed to open air due to service,
drier must be replaced. All replacement driers must be
approved for HFC−410A refrigerant.
COMPRESSOR
All TSA*S4 units utilize a scroll compressor. The scroll
compressor design is simple, efficient and requires few
moving parts. A cutaway diagram of the scroll compressor is
illustrated in Figure 3. The scrolls are located in the top of the
compressor can and the motor is located just below. The oil
level is immediately below the motor.
The scroll is a simple compression concept centered around
the unique spiral shape of the scroll and its inherent
properties. Two identical scrolls are mated together forming
concentric spiral shapes as illustrated in Figure 4. One scroll
remains stationary, while the other is allowed to "orbit" (figure
5). Note that the orbiting scroll does not rotate or turn but
merely orbits the stationary scroll.
NOTE − During operation, the head of a scroll compressor
may be hot since it is in constant contact with discharge gas.

Page 7
DISCHARGE
SUCTION
Figure 3. Scroll Compressor
STATIONARY SCROLL
ORBITING SCROLL
DISCHARGE
SUCTION
TIPS SEALED BY
DISCHARGE PRESSURE
DISCHARGE
PRESSURE
Figure 4. Scroll Cross−Section
The counterclockwise orbiting scroll draws gas into the outer
crescent shaped gas pocket created by the two scrolls as
illustrated in Figure 5, detail A. The centrifugal action of the
orbiting scroll seals off the flanks of the scrolls as illustrate din
Figure 5, detail B. As the orbiting motion continues, the gas is
forced toward the center of the scroll and the gas pocket
becomes compressed as illustrated in Figure 5, detail C.
When the compressed gas reaches the center, it is
discharged vertically into a chamber and discharge port in the
top of the compressor as illustrate in Figure 4. The discharge
pressure forcing down on the top scroll helps seal off the
upper and lower edges (tips) of the scrolls as illustrated in
Figure 4. During a single orbit, several pockets of gas are
compressed simultaneously providing smooth continuous
compression.
The scroll compressor is tolerant to the effects of liquid
return. If liquid enters the scrolls, the orbiting scroll is allowed
to separate from the stationary scroll. The liquid is worked
toward the center of the scroll and is discharged. If the
compressor is replaced, conventional Lennox cleanup
practices must be used.
Due to its efficiency, the scroll compressor is capable of
drawing a much deeper vacuum than reciprocating
compressors. Deep vacuum operation can cause
internal fusitearcingresultingindamagedinternal parts
and will result in compressor failure. Never use a scroll
compressor for evacuating or to pump system into a
vacuum. This type of damage can be detected and will
result in denial of warranty claims.
The scroll compressor is quieter than a reciprocating
compressor, however, the two compressors have much
different sound characteristics. The sounds made by a scroll
compressor do not affect system reliability, performance, or
indicate damage.
See compressor nameplate or ELECTRICAL DATA for
compressor specifications.
DETAIL A
SUCTION
POCKET
SUCTION
ORBITING SCROLL
STATIONARY SCROLL
SUCTION SUCTION
DISCHARGE
POCKET
SUCTION INTERMEDIATE PRESSURE
GAS
CRESCENT
SHAPED
GAS POCKET
HIGH PRESSURE GAS
FLANKS SEALED
BY CENTRIFUGAL
FORCE
MOVEMENT OF ORBIT
DETAIL B
DETAIL C DETAIL D
Figure 5. Scroll Compressors

Page 8
Scroll Compressor Operations
The B1 scroll compressor design is simple, efficient and
requires few moving parts. A cutaway diagram of the scroll
compressor is illustrated in Figure 7. The scrolls are
located in the top of the compressor can and the motor is
located just below. The oil level is immediately below the
motor.
SCROLL FORM
Figure 6. Scroll Form
DISCHARGE
SUCTION
Figure 7. Scroll Compressor
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
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
Operating Gauge Set and Service Valves
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
TORQUE REQUIREMENTS
When servicing or repairing heating, ventilating, and air
conditioning components, ensure the fasteners are
appropriately tightened. Table 1 lists torque values for
fasteners.
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
roundingor breaking off the wrench, or stripping the valve stem recess.
See the Lennox Service and Application Notes #C−08−1 for further
details and information.
IMPORTANT
To prevent stripping of the various caps used, the appropriately sized
wrench should be used and fitted snugly over the cap before tightening.
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 provides
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 SET
When checking the system charge, only use a manifold
gauge set that features low loss anti−blow back fittings.
Manifold gauge set 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 psig on the high side and a low
side of 30" vacuum to 250 psig with dampened speed to
500 psi. Gauge hoses must be rated for use at up to 800
psig of pressure with a 4000 psig 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 8 provides information
on how to access and operating both angle and ball service
valves.

Page 9
(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE
VALVE STEM
FRONT-SEATED
TO OUTDOOR
UNIT
SERVICE PORT
CORE
TO INDOOR
UNIT
SERVICE PORT
SERVICE PORT CAP
CLOSED TO BOTH
INDOOR AND OUTDOOR
UNITS
STEM CAP
ANGLE−TYPE
SERVICE VALVE
(FRONT−SEATED
CLOSED)
SERVICE PORT
SERVICE PORT
CORE
TO OUTDOOR UNIT
STEM CAP
(VALVE STEM
SHOWN OPEN)
INSERT HEX
WRENCH HERE
SERVICE PORT CAP
TO INDOOR
UNIT
OPEN TO BOTH INDOOR AND
OUTDOOR UNITS
ANGLE−TYPE SERVICE VALVE
(BACK−SEATED OPENED)
BALL (SHOWN CLOSED)
SERVICE PORT CORE
TO INDOOR UNIT
TO OUTDOOR UNIT
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT CAP
STEM CAP
VALVE STEM
WHEN SERVICE VALVE IS CLOSED, THE SERVICE PORT IS OPEN TO THE
LINE SET AND INDOOR UNIT.
BALL−TYPE SERVICE
VALVE
SERVICE VALVES
VARIOUS TYPES
WHEN SERVICE VALVE IS OPEN, THE SERVICE PORT IS OPEN TO LINE SET,
INDOOR AND OUTDOOR UNIT.
To Access Service Port:
A service port cap protects the service port core from contamination and
serves as the primary leak seal.
1. Remove service port cap with an appropriately sized wrench.
2. Connect gauge set to service port.
3. When testing is completed, replace service port cap and tighten as fol-
lows: 123
4
5
6
7
8
9
10
11 12
1/6 TURN
Operating Angle Type Service Valve:
1. Remove stem cap with an appropriately sized wrench.
2. Use a service wrench with a hex−head extension (3/16" for liquid line valve sizes and 5/16" for vapor line valve
sizes) to back the stem out counterclockwise as far as it will go.
Operating Ball Type Service Valve:
1. Remove stem cap with an appropriately sized wrench.
2. Use an appropriately sized wrenched to open. To open valve, rotate stem counterclockwise 90°. To close rotate stem clockwise 90°.
Reinstall Stem Cap:
Stem cap protects the valve stem from damage and serves as the primary seal. Replace the stem cap and
tighten as follows:
With Torque Wrench: Finger tighten and then torque cap per Table 1.
Without Torque Wrench: Finger tighten and use an appropriately sized wrench to turn
an additional 1/12 turn clockwise.
NOTE  A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.
123
4
5
6
7
8
9
10
11 12
1/6 TURN
With Torque Wrench: Finger tighten and torque cap per Table 1.
Without Torque Wrench: Finger tighten and use an appropriately
sized wrench to turn an additional 1/6 turn clockwise.
Figure 8. Angle and Ball Service Valves

Page 10
Recovering Refrigerant from Existing System
SERVICE
DISCONNECT
SWITCH
MAIN FUSE BOX/BREAKER PANEL
Disconnect all power to the existing outdoor unit at the disconnect
switch or main fuse box/breaker panel.
DISCONNECT POWER CONNECT MANIFOLD GAUGE SET
MANIFOLD GAUGES
RECOVERY MACHINE
CLEAN RECOVERY
CYLINDER
OUTDOOR UNIT
HIGH
LOW
Connect a gauge set, clean recovery cylinder and a recovery
machine to the service ports of the existing unit. Use the
instructions provided with the recovery machine to make the
connections.
METHOD 1:
Us this method 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.
Remove all HCFC−22 refrigerant from the existing system. Check gauges after shutdown to confirm that the entire system is completely void of
refrigerant.
METHOD 2:
Use this method if the existing outdoor unit is equipped with manual shut−off valves, and you plan to use new HCFC−22 refrigerant to flush the
system.
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 cycle the compressor OFF.
Compressor can stop pumping due to tripped internal pressure relief valve.
Compressor has internal vacuum protection that is designed to unload the scrolls (compressor stops pumping) when the pressure ratio meets
a certain value or when the suction pressure is as high as 20 psig. (Compressor suction pressures should never be allowed to go into a vacuum.
Prolonged operation at low suction pressures will result in overheating of the scrolls and permanent damage to the scroll tips, drive bearings and
internal seals.)
Once the compressor can not pump down to a lower pressure due to one of the above system conditions, shut off the vapor valve. Turn OFF the
main power to unit and use a recovery machine to recover any refrigerant left in the indoor coil and line set.
Perform the following task:
AStart the existing HCFC−22 system in the cooling mode and close the liquid line valve.
BUse the compressor to pump as much of the existing HCFC−22 refrigerant into the outdoor unit until the outdoor system is full. Turn the outdoor unit
main power OFF and use a recovery machine to remove the remaining refrigerant from the system.
NOTE  It may be necessary to bypass the low pressure switches (if equipped) to ensure complete refrigerant evacuation.
CWhen the low side system pressures reach 0 psig, close the vapor line valve.
DCheck gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system.
RECOVERING
REFRIGERANT FROM SYSTEM
Remove existing HCFC−22 refrigerant using one of the following procedures:
RECOVERING REFRIGERANT
IMPORTANT  Some system configurations may contain higher than normal refrigerant charge due to either large internal coil volumes,
and/or long line sets.
12
3

Page 11
New Outdoor Unit Placement
See Unit Dimensions on Page3 for sizing mounting slab,
platforms or supports. Refer to Figure 9 for mandatory
installation clearance requirements.
*
**
*
NOTES:
Service panel access clearance of 30 in. (762 mm) must be
maintained.
Clearance to one of the other three sides must be 36 in. (914
mm).
Clearanceon one of the remaining two sides may be 12 in. (305
mm) and the final side may be 6 in. (152 mm).
Clearance required on top of unit is 48 in. (1219 mm).
A clearance of 24 in. (610 mm) must be maintained between two
units.
Figure 9. Installation Clearances
POSITIONING CONSIDERATIONS
CAUTION
In order to avoid injury, take proper precaution when lifting heavy objects.
Consider the following when positioning the unit:
Some localities are adopting sound ordinances based
on the unit’s sound level registered from the adjacent
property, not from the installation property. Install the
unit as far as possible from the property line.
When possible, do not install the unit directly outside
a window. Glass has a very high level of sound
transmission. For proper placement of unit in relation
to a window see the provided illustration in Figure 10.
INSTALL UNIT AWAY
FROM WINDOWS
TWO 90° ELBOWS INSTALLED
IN LINE SET WILL REDUCE
LINE SET VIBRATION.
Figure 10. Outside Unit Placement
PLACING OUTDOOR UNIT ON SLAB
When installing a unit at grade level, the top of the slab
should be high enough above the grade so that water from
higher ground would not collect around the unit as
illustrated in Figure 11.
GROUND LEVEL
MOUNTING
SLAB
BUILDING
STRUCTURE
DISCHARGE AIR
Figure 11. Typical Slab Mounting at Ground Level
Slab may be level or have a slope tolerance away from the
building of not more than two degrees, or 2 inches per 5
feet (51 mm per 1524 mm) as illustrated in Figure 11.
INSTALLING OUTDOOR UNIT ON ROOF
Install the unit at a minimum of 4 inches (102 mm) above
the surface of the roof. Ensure the weight of the unit is
properly distributed over roof joists and rafters. Redwood
or steel supports are recommended.
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 10.

Page 12
New or Replacement Line Set
This section provides information on new installation or
replacement of existing line set. If a new or replacement
line set is not required, then proceed to Brazing
Connections on Page 14.
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 braze connections). Use Lennox L15 (braze,
non−flare) series line set, or use field−fabricated refrigerant
lines as listed in Table 2.
Table 2. XP Refrigerant Connections and Line Set
Requirements
Model
Valve Field Connections and Recommended
Line Set
Liquid
Line
Suction
Line L15 Line Set
−024
−030
3/8 in.
(10 mm)
3/4 in.
(19 mm) L15 line set sizes are dependent
on unit matchup. See Engineering
Handbook to determine correct line
set sizes.
−036
−048
3/8 in.
(10 mm)
7/8 in.
(22 mm)
−060 3/8 in.
(10 mm)
1−1/8 in.
(29 mm) Field Fabricated
NOTE  Some applications may required a field provided 7/8" to
1−1/8" adapter
NOTE − When installing refrigerant lines longer than 50
feet, contact Lennox Technical Support Product
Applications for assistance or Lennox piping manual. To
obtain the correct information from Lennox, be sure to
communicate the following points:
Model (XP) and size of unit (e.g. −060).
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 XP 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 XP unit. Typically a liquid line
used to meter flow is 1/4" in diameter and copper.
LIQUID LINE FILTER DRIER INSTALLATION OR
REPLACEMENT
The filter drier (one is shipped with each XP unit) must be
field installed in the liquid line between the outdoor unit’s
liquid line service valve and the indoor coil’s metering
device (fixed orifice or TXV) as illustrated in Figure 12. This
filter drier must be installed to ensure a clean,
moisture−free system. Failure to install the filter drier will
void the warranty. A replacement filter drier is available
from Lennox. See Brazing Connections on Page 14 for
special procedures on brazing filter drier connections to
the liquid line.
OUTDOOR
UNIT
LIQUID LINE
SERVICE VALVE LIQUID LINE
FILTER DRIER
LINE LIQUID
LINE
BRAZE CONNECTION POINTS
Figure 12. Typical Liquid Line Filter Drier
Installation
LINE SET ISOLATION
CAUTION
Brazing alloys and flux contain materials which are hazardous to your
health.
Avoid breathing vapors or fumes from brazing operations. Perform
operationsonly in well ventilated areas.
Wear gloves and protective goggles or face shield to protect against
burns.
Wash hands with soap and water after handling brazing alloys and flux.
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
reclaimingmust 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.

Page 13
ANCHORED HEAVY NYLON
WIRE TIE OR AUTOMOTIVE
MUFFLER-TYPE HANGER
STRAP LIQUID LINE TO
VAPOR LINE
WALL
STUD
LIQUID LINE
NON−CORROSIVE
METAL SLEEVE
VAPOR LINE − WRAPPED
IN ARMAFLEX
AUTOMOTIVE
MUFFLER-TYPE HANGER
REFRIGERANT LINE SET  TRANSITION
FROM VERTICAL TO HORIZONTAL
Line Set Isolation  The following illustrations are
examples of proper refrigerant line set isolation:
STRAPPING
MATERIAL (AROUND
VAPOR LINE ONLY)
TAPE OR
WIRE TIE
WIRE TIE (AROUND
VAPOR LINE ONLY)
FLOOR JOIST OR
ROOF RAFTER
TAPE OR
WIRE TIE
To hang line set from joist or rafter, use either metal strapping material
or anchored heavy nylon wire ties.
8 FEET (2.43 METERS)
STRAP THE VAPOR LINE TO THE JOIST
OR RAFTER AT 8 FEET (2.43 METERS)
INTERVALS THEN STRAP THE LIQUID
LINE TO THE VAPOR LINE.
FLOOR JOIST OR
ROOF RAFTER
REFRIGERANT LINE SET  INSTALLING
HORIZONTAL RUNS
NOTE  Similar installation practices should be used if line set is
to be installed on exterior of outside wall.
PVC
PIPE
FIBERGLASS
INSULATION
CAULK
OUTSIDE
WALL
VAPOR LINE WRAPPED
WITH ARMAFLEX
LIQUID
LINE
OUTSIDE WALL LIQUID LINE
VAPOR LINE
WOOD BLOCK
BETWEEN STUDS
STRAP
WOOD BLOCK
STRAP
SLEEVE
WIRE TIE
WIRE TIE
WIRE TIE
INSIDE WALL
REFRIGERANT LINE SET  INSTALLING
VERTICAL RUNS (NEW CONSTRUCTION SHOWN)
INSTALLATION
LINE SET
NOTE  Insulate liquid line when it is routed through areas where the
surrounding ambient temperature could become higher than the
temperatureof the liquid line or when pressure drop is equal to or greater
than 20 psig.
NON−CORROSIVE
METAL SLEEVE
IMPORTANT  Refrigerant lines must not contact structure.
NON−CORROSIVE
METAL SLEEVE
8 FEET (2.43 METERS)
IMPORTANT  Refrigerant lines must not contact wall
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.
Figure 13. Line Set Installation

Page 14
CUT AND DEBUR
CAP AND CORE REMOVAL
Cut ends of the refrigerant lines square
(free from nicks or dents) and debur the
ends. The pipe must remain round and do
not pinch end of the line.
Remove service cap and core
from both the vapor and liquid line
service ports.
ATTACHED GAUGES
OUTDOOR
UNIT
LIQUID LINE
VAPOR LINE
LIQUID LINE SERVICE
VALVE
VAPOR LINE
SERVICE
VALVE
ATTACH
GAUGES
INDOOR
UNIT
SERVICE PORT MUST BE OPEN TO ALLOW EXIT
POINT FOR NITROGEN
AConnect gauge set low pressure side to liquid line service
valve.
BConnect gauge set center port to bottle of nitrogen with
regulator.
NITROGEN
HIGHLOW
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
WRAP SERVICE VALVE FLOW NITROGEN
To protect components during
brazing, wrap a wet cloth around
the liquid line service valve body
and copper tube stub and use
anotherwet cloth underneath the
valve body to protect the base
paint.
Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration
gaugeset into the valve stem port connection on the liquid line service
valve and out of the valve stem port connection on the vapor service
valve.
NOTE  The fixed orifice or check
expansion valve metering device at the
indoor unit will allow low pressure
nitrogen to flow through the system.
NITROGEN
HIGH
LOW
USE REGULATOR TO
FLOW NITROGEN AT 1
TO 2 PSIG.
BRAZE LINE SET
INSTALL SERVICE PORT CAPS ONLY
Braze the liquid line to the liquid line
service valve. Turn off nitrogen flow.
After all connections have been brazed, disconnect manifold gauge
set from service ports, cool down piping with wet rag and remove all
wrappings. Do not reinstall cores until after evacuation procedure.
Reinstall service port caps if desired to close off refrigerant ports.
IMPORTANT  Connect gauge set low pressure side to vapor
line service valve and repeat procedure starting at paragraph 4
for brazing the liquid line to service port valve.
SERVICE PORT CORE
SERVICE PORT CAP
SERVICE PORT
WARNING  Allow braze joint to cool before removing the wet
rag from the service valve. (TEMPERATURES ABOVE 250ºF
CAN DAMAGE VALVE SEALS
CONNECTIONS
BRAZING
12
3
45
6
7
B
A
POINT FLAME AWAY FROM
SERVICE VALVE
NOTE − Use silver alloy brazing rods with five or six percent minimum silver
alloy for copper−to−copper brazing, 45 percent alloy for copper−to−brass and
copper−to−steel brazing.
Figure 14. Brazing Connections

Page 15
Metering Devices and Flushing the System
SENSING
LINE
TEFLON RING
FIXED ORIFICE
(Uncased Coil Shown)
BRASS NUT
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR TUBES
DISTRIBUTOR
ASSEMBLY
REMOVE AND DISCARD
WHITE TEFLON SEAL (IF
PRESENT)
AOn fully cased coils, remove the coil access and plumbing panels.
BRemove any shipping clamps holding the liquid line and distributor
assembly.
CUsing two wrenches, disconnect liquid line from liquid line orifice
housing. Take care not to twist or damage distributor tubes during
this process.
DRemove and discard fixed orifice, valve stem assembly if present
and Teflon washer as illustrated above.
EUse a field−provided fitting to temporary reconnect the liquid line to
the indoor unit’s liquid line orifice housing.
FReplace with expansion valve.
TYPICAL FIXED ORIFICE REMOVAL
TYPICAL EXPANSION VALVE REMOVAL AND
REPLACEMENT PROCEDURE
TWO PIECE PATCH PLATE
(UNCASED COIL ONLY)
VAPOR
LINE
DISTRIBUTOR
ASSEMBLY
DISTRIBUTOR
TUBES
LIQUID
LINE
MALE EQUALIZER
LINE FITTING
EQUALIZER
LINE
EXPANSION
VALVE
TEFLON
RING
(Uncased Coil Shown)
STUB END
TEFLON
RING
SENSING BULB
LIQUID LINE
ORIFICE
HOUSING
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
AOn fully cased coils, remove the coil access and plumbing panels.
BRemove any shipping clamps holding the liquid line and distributor as-
sembly.
CDisconnect the equalizer line from the expansion valve equalizer line
fitting on the vapor line.
DRemove the vapor line sensing bulb.
EDisconnect the liquid line from the expansion valve at the liquid line as-
sembly.
FDisconnect the expansion valve from the liquid line orifice housing.
Take care not to twist or damage distributor tubes during this process.
GRemove and discard expansion valve and the two Teflon rings.
HUse a field−provided fitting to temporary reconnect the liquid line to the
indoor unit’s liquid line orifice housing.
IReverse above order to install.
LOW HIGH
EXISTING
INDOOR
UNIT
GAUGE
MANIFOLD
INVERTED HCFC−22
CYLINDER CONTAINS
CLEAN HCFC−22 TO BE
USED FOR FLUSHING.
LIQUID LINE SERVICE
VALVE
INLET
DISCHARGE
TANK
RETURN
CLOSED
OPENED
RECOVERY
CYLINDER
RECOVERY MACHINE
NEW
OUTDOOR
UNIT
VAPOR LINE
SERVICE VALVE
VAPOR
LIQUID
1
AInverted HCFC−22 cylinder with clean refrigerant to the vapor service
valve.
BHCFC−22 gauge set (low side) to the liquid line valve.
CHCFC−22 gauge set center port to inlet on the recovery machine with
an empty recovery tank to the gauge set.
DConnect recovery tank to recovery machines per machine
instructions.
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
A
B
C
D
B
OR
FLUSHING LINE SET
ASet the recovery machine for liquid recovery and start the recov-
ery machine. Open the gauge set valves to allow the recovery
machine to pull a vacuum on the existing system line set and in-
door unit coil.
BInvert the cylinder of clean HCFC−22 and open its valve to allow
liquid refrigerant to flow into the system through the vapor line
valve. Allow the refrigerant to pass from the cylinder and through
the line set and the indoor unit coil before it enters the recovery
machine.
CAfter all of the liquid refrigerant has been recovered, switch the
recovery machine to vapor recovery so that all of the HCFC−22
vapor is recovered. Allow the recovery machine to pull down to 0
the system.
DClose 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.
The line set and indoor unit coil must be flushed with at least the
same amount of clean refrigerant that previously charged the sys-
tem. Check the charge in the flushing cylinder before proceeding.
LINE SET AND INDOOR COIL
FLUSHING
1
2
3
CAUTION  This procedure should not be performed on systems
which contain contaminants (Example compressor burn out.

Page 16
Leak Testing the System
TO VAPOR
SERVICE VALVE
HFC−410A
MANIFOLD GAUGE SET
OUTDOOR UNIT
HIGHLOW
NITROGEN
NOTE  Normally, the high pressure hose is connected to the liquid line port. How-
ever, connecting it to the vapor port better protects the manifold gauge set from high
pressure damage.
AWith 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 (vapor only).
BOpen 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.
CConnect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.
DAdjust 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.
EAfter 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.
FAfter leak testing disconnect gauges from service ports.
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
LINE SET AND INDOOR COIL
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:
LEAK TEST
AConnect an HFC−410A manifold gauge set high
pressure hose to the vapor valve service port.
BWith both manifold valves closed, connect the
cylinder of HFC−410A refrigerant to the center port
of the manifold gauge set.
1CONNECT GAUGE SET
2TEST FOR LEAKS
A
B
NOTE  Later in the procedure, the HFC−410A
container will be replaced by the nitrogen container.
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).
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.
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 re-
frigeration lines. Oxygen, when exposed to a
spark or open flame, can cause damage by fire
and/or an explosion, that could result in person-
al injury or death.
IMPORTANT
Leak detector must be capable of sensing HFC refrigerant.

Page 17
Evacuating the System
AOpen both manifold valves and start the vacuum pump.
BEvacuate 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. A rapid rise in pressure
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.
CWhen 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.
DShut 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.
EReconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the
absolutepressure 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.
FWhen 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.
GPerform the following:
OUTDOOR
UNIT
TO VAPOR
SERVICE VALVE
TO LIQUID LINE
SERVICE VALVE
MICRON
GAUGE
VACUUM PUMP
A34000 1/4 SAE TEE WITH
SWIVEL COUPLER
500
MANIFOLD
GAUGE SET
HFC−410A
RECOMMEND
MINIMUM 3/8" HOSE
AConnect low side of manifold gauge set
with 1/4 SAE in−line tee to vapor line
service valve
BConnect high side of manifold gauge
set to liquid line service valve
CConnect micron gauge available
connector on the 1/4 SAE in−line tee.
DConnect the vacuum pump (with
vacuum gauge) to the center port of the
manifold gauge set. The center port line
will be used later for both the HFC−410A
and nitrogen containers.
HIGH
LOW
123
4
5
6
7
8
9
1011 12
1/6 TURN
NITROGEN
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
EVACUATING
1CONNECT GAUGE SET
A
B
C
D
2EVACUATE THE SYSTEM
Close manifold gauge valves.
Shut off HFC−410A cylinder.
Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with
core tool while maintaining a positive system pressure.
Replace the stem caps and secure finger tight, then tighten an additional one−sixth (1/6) of a turn as
illustrated.
LINE SET AND INDOOR COIL
NOTE  Remove cores from service valves (if not al-
ready done).

Page 18
IMPORTANT
Use a thermocouple or thermistor electronic vacuum gauge that is
calibrated in microns. Use an instrument capable of accurately
measuringdown to 50 microns.
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.
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.
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 air handler installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
24VAC TRANSFORMER
Use the transformer provided with the furnace or air
handler for low-voltage control power (24VAC − 40 VA
minimum)
SERVICE
DISCONNECT
SWITCH
MAIN FUSE BOX/
BREAKER PANEL
Refer to the unit nameplate for minimum circuit ampacity, and maximum
fuse or circuit breaker (HACR per NEC). Install power wiring and properly
sized disconnect switch.
NOTE  Units are approved for use only with copper conductors.
Ground unit at disconnect switch or to an earth ground.
SIZE CIRCUIT AND INSTALL DISCONNECT SWITCH
NOTE  24VAC, Class II circuit connections are made in the control
panel.
Install room thermostat (ordered separately) on an inside wall
approximatelyin the center of the conditioned area and 5 feet (1.5m) from
the floor. It should not be installed on an outside wall or where it can be
affected by sunlight or drafts.
THERMOSTAT
5 FEET
(1.5M)
INSTALL THERMOSTAT
WARNING
Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and local codes.
Line voltage is present at all components when unit is not in operation on units with single-pole contactors. Disconnect all remote electric
power supplies before opening access panel. Unit may have multiple power supplies.

Page 19
Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. To facilitate a conduit, a cutout is located
in the bottom of the control panel. Connect conduit to the control panel using a proper conduit fitting.
ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING
CONTROL
WIRING
HIGH VOLTAGE
FIELD WIRING
LOW VOLTAGE
FIELD WIRING
FACTORY
WIRING
GROMMET AND
WIRE TIE
WIRE RUN LENGTH AWG# INSULATION TYPE
LESS THAN 100’ (30 METERS) 18 TEMPERATURE RATING
MORE THAN 100’ (30 METERS) 16 35ºC MINIMUM.
Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit as illustrated.
HIGH VOLTAGE / GROUND WIRES
CONTROL WIRING
ARun 24VAC control wires through hole with grommet
and secure with provided wire tie.
BMake 24VAC thermostat wire connections. Locate the
two wires from the contactor and make connection
using field provided wire nuts:
Yellow to Y1
Black to C (common)
NOTE  For proper voltages, select thermostat wire (control wires)
gauge per Table above.
NOTE  Wire tie provides low voltage control wire strain
relief and to maintain separation of field installed low and
high voltage circuits.
A
W1
Y
G
C
R
Y
G
C
THERMOSTAT INDOOR UNIT
POWER
HEAT
COOLING
INDOOR
BLOWER
COMMON
OUTDOOR
UNIT
Y1
C
W
R
TYPICAL LOW VOLTAGE FIELD
WIRING
HIGH VOLTAGE
FLEXIBLE CONDUIT
THREE PHASE
SINGLE PHASE
NOTE  Do not bundle any excess 24VAC control wires
inside control panel.
CONTROL
WIRING
GROUND
HIGH VOLTAGE
CONNECTIONS
(CONTACTOR)
HIGH VOLTAGE
CONNECTIONS
(CONTACTOR)
GROUND
GROMMET AND
WIRE TIE
HIGH VOLTAGE
FLEXIBLE CONDUIT
B
A
B

Page 20
Figure 15. Typical Field Wiring Diagram  M Voltage  380/420v (3PH) 50Hz
NOTE− The thermostat used may be electromechanical or
electronic.
NOTE− Transformer in indoor unit supplies power (24
VAC) to the thermostat and outdoor unit controls.
COOLING:
1. Cooling demand initiates at Y1 in the thermostat.
2. 24VAC from indoor unit (Y1) energizes contactor K1.
3. K1-1 N.O. closes, energizing compressor (B1) and
outdoor fan motor (B4).
END OF COOLING DEMAND:
4. Cooling demand is satisfied. Terminal Y1 is
de-energized.
5. Compressor contactor K1 is de-energized.
6. K1-1 opens and compressor (B1) and outdoor fan
motor (B4) are de-energized and stop immediately.
NOTE− The thermostat used may be electromechanical or
electronic.