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Defrost sensor will be closed at 32_ F or below. If tempera
tures are such that switch is not closed, jumper between
defrost sensor terminals on defrost control.
Start system in Heating Operation.
Jumper test pins. A 1/4" quick connect terminal crimped
onto a solid wire or brazing rod works well for test jumper.
Closing test pins speeds up time interval by a factor of 256.
Defrost Control Defrost Test Cycle Time
T1−30 minutes
T2−60 minutes
T3−90 minutes
After closing test pins and appropriate cycle time has
elapsed, the reversing valve should shift to defrost mode
and outdoor fan should stop. After 2 seconds of defrost op
eration, reversing valve should shift back to heating opera
tion and outdoor fan should start.
Adjustments − 12CHP060 Only
12CHP060 units are equipped with a variable speed indoor
blower motor. The blower speed is factory−set and should
not require field adjustment; however, air volume can be in
creased by 5 percent, if necessary. Follow the procedure
below.
1 − Disconnect power.
2 − Locate the blower control board wiring harness.
3 − To increase air volume (CFM) in the cooling mode, use a
pin extractor to remove the wire from harness pin posi
tion 5 (violet wire).
4 − To increase air volume (CFM) in the heating mode,
use a pin extractor to remove the wire from harness
pin position 11 (pink wire)
NOTE − If a pin extractor is not available, cut the wire and
tape off both ends.
Maintenance
Periodic inspection and maintenance normally consists of
changing or cleaning filters and (under some conditions)
cleaning the coils.
WARNING
Electric shock hazard. Can cause inju
ry or death. Before attempting to per
form any service or maintenance, turn
the electircal power to unit OFF at dis
connect switch(es). Unit may have
multiple power suppplies.
Low Ambient Control
High Pressure Cut−out Kit
Outdoor Thermostat
Timed Off Control
7 seconds
14 seconds
21 seconds
Accessories
Description
Filters
Not supplied. Inspect once a month. Replace disposable or
clean permanent type as necessary. DO NOT replace per
manent type with disposable.
Outdoor Motor
The outdoor fan motor is permanently lubricated and re
quires no maintenance.
Outdoor Coil
Dirt should not be allowed to accumulate on the outdoor
coil surface or other parts in the air circuit. Cleaning should
be as often as necessary to keep coil clean. Use a brush,
vacuum cleaner attachment, or other suitable means. If
water is used to clean coil, be sure power to the unit is shut
off prior to cleaning.
NOTE − Care should be used when cleaning the coil so that
the coil fins are not damaged.
Repair Parts List
When ordering parts, include the complete model number
and serial number which are printed on the rating plate lo
cated on the unit.
Control Group
Transformer
Blower Group
Blower Housing Assembly
Blower Wheel
Blower Motor
Blower Motor Mount
Blower Motor Capacitor (if used)
Fan Blade
Fan Motor
Fan Motor Capacitor
Cooling Group
Compressor
Coil−Evaporator
Drier
Cap Tube or Expansion Valve
Contactor
Time Delay Relay
Fan Relay
Capacitor
Coil−Condenser
Defrost Control
Reversing Valve Solenoid
Kit Number
ALOAM111−1
AHPSW436−1
LB−29740BA
ATIMR446−1
Page 10
LENNOX Cat. Number
42K88
42K89
56A87
42K90
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