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KHA180, 240
Heating Start−Up
1− Set thermostat or temperature control device to
initiate a first−stage heating demand.
A first−stage heating demand (W1) will energize
compressors 1 and 2. All four outdoor fans are
energized with a W1 demand.
KHA Units With Optional Electric Heat −
An increased heating demand (W2) will energize
electric heat.
Service
CAUTION
Label all wires prior to disconnection when servic-
ing controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during
installation, maintenance, or repair will expose you
to fiberglass wool. 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.
P.O. Box 799900
Dallas, TX 75379−9900
The unit should be inspected once a year by a qualified
service technician.
A−Lubrication
All motors are lubricated at the factory. No further
lubrication is required.
Blower shaft bearings are prelubricated. For extended
bearing life, relubricate at least once every two years with
a lithium base grease, such as Alvania 3 (Shell Oil),
Chevron BRB2 (Standard Oil) or Regal AFB2 (Texas Oil).
Use a hand grease gun for relubrication. Add only enough
grease to purge through the bearings so that a bead of
grease appears at the seal lip contacts.
B−Filters
Units are equipped with six 24 X 24 X 2" filters. Filters
should be checked and replaced when necessary with
filters of like kind and size. Take note of air flow direction
marking on filter frame when reinstalling filters. See
figure 10.
NOTE−Filters must be U.L.C. certified or equivalent for
use in Canada.
FIGURE 10
REMOVE FILTERS
PULL TO
REMOVE
FILTERS
C−Indoor Coil
Inspect and clean coil at beginning of each cooling and
heating season. Clean using mild detergent or
commercial coil cleaner. Flush coil and condensate drain
with water taking care not to get insulation, filters and
return air ducts wet.
D−Outdoor Coil
Clean outdoor coil annually with detergent or commercial
coil cleaner and inspect monthly during the cooling season.
Outdoor coils are made of two formed slabs. Dirt and
debris may become trapped between the slabs. To clean
between slabs, carefully separate coil slabs and wash
them thoroughly. See figure 11. Flush coils with water
following cleaning.
Note − Remove all screws and gaskets prior to cleaning
procedure and replace upon completion.
E−Supply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated
dirt or dust. Turn off power before attempting to remove
access panel or to clean blower wheel.
