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506238−01 06/09
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
Shipping and Packing List
Check unit for shipping damage. Consult last carrier
immediately if damage is found.
1 Assembled outdoor unit.
1 Bag assembly that consist of the following:
1 Bushing (for low voltage wiring)
2 Isolation grommets for liquid and suction lines
System Overview
The SunSource
t
Comfort System heat pump, 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 XPG20
Engineering Handbook
.
This outdoor unit is designed for use in systems that use
check thermal expansion valve (CTXV) refrigerant
metering device.
Operating Gauge Set
This instruction is 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 HVAC components, ensure
the fasteners are appropriately tightened. Table 1 list
torque values for fasteners.
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and
fitted snugly over the cap before tightening.
IMPORTANT
Only use Allen wrenches of sufficient hardness
(50Rc − Rockwell Harness Scale minimum). Fully
insert the wrench into the valve stem recess.
Service valve stems are factory−torqued (from 9
ft−lbs for small valves, to 25 ft−lbs for large valves) to
prevent refrigerant loss during shipping and
handling. Using an Allen wrench rated at less than
50Rc risks rounding or breaking off the wrench, or
stripping the valve stem recess.
See the Lennox Service and Application Notes
#C−08−1 for further details and information.
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
Coupler Set Screws
150 in.− lb.
17 NM
Torque Arm Nut
55 in.− lb
6 NM
Assist Motor Bolts
35 in.− lb.
4 NM
Motor Mount Wire
Bracket
55 in.− lb
6 NM
