Page 9
Defrost sensor will be closed at 32E F or below. If tem-
peratures are such that switch is not closed, jumper be-
tween 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 speed up time interval by
a factor of 256.
'()5267 &21752/ '()5267 7(67 &<&/( 7,0(
T1--30 minutes
7 seconds
T2--60 minutes
14 seconds
T3--90 minutes
21 seconds
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 operation, reversing valve should shift back to
heating operation and outdoor fan should start.
0$,17(1$1&(
Periodic inspection and maintenance normally con-
sists of changing or cleaning filters and (under some
conditions) cleaning the coils.
)LOWHUV
Not supplied. Inspect once a month. Replace dispos-
able or clean permanent type as necessary. DO NOT re-
place permanent type with disposable.
0RWRUV
Indoor and outdoor fan motors are permanently lubri-
cated and require no maintenance.
2XWGRRU &RLO
Dirt should not be allowed to accumulate on the out-
door coil surface or other parts in the air circuit. Clean-
ing should be as often as necessary to keep coil clean.
Use a brush, vacuum cleaner attachment, or other suit-
able means. If water is used to clean coil, be sure power
to the unit is shut off prior to cleaning.
127( &DUH VKRXOG EH XVHG ZKHQ FOHDQLQJ WKH FRLO VR
WKDW WKH FRLO ILQV DUH QRW GDPDJHG
5(3$,5 3$576 /,67
When ordering parts, include the complete model
number and serial number which are printed on the
rating plate located on the unit.
&21752/ *5283
Transformer
%/2:(5 *5283
Blower Housing Assembly
Blower Wheel
Blower Motor
Blower Motor Mount
Blower Motor Capacitor (if used)
Fan Blade
Fan Motor
Fan Motor Capacitor
&22/,1* *5283
Compressor
Coil--Evaporator
Drier
Cap Tube or Expansion Valve
Contactor
Time Delay Relay
Fan Relay
Capacitor
Coil--Condenser
Defrost Control
Reversing Valve Solenoid
CHP29 ACCESSORIES
Description
Kit Number
LENNOX Cat.
Number
LOW AMBIENT CONTROL
ALOAM111--1
42K88
HIGH PRESSURE CUT--OUT KIT
AHPSW436--1
42K89
OUTDOOR THERMOSTAT
LB--29740BA
56A87
TIMED OFF CONTROL
ATIMR446--1
42K90
