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Whenever the evaporator fan is energized (during heating,
cooling or continuous fan), 24-v power is on terminal IFO on
the economizer or two-position damper control board. The
damper motor will be energized with 12-vdc power and the
damper will drive open until SW3 on the damper is deacti-
vated. The damper motor will stop, and damper will remain
in the minimum ventilation position until the evaporator fan
is shut off. When the evaporator fan is shut off, the damper
motor is again energized and the damper runs closed until
SW2 is activated and the damper motor turns off.
CARE AND MAINTENANCE
To ensure continuing high performance, and to minimize the
possibility of premature equipment failure, periodic mainte-
nance must be performed on this equipment. This combina-
tion heating/cooling unit should be inspected at least once each
year by a qualified service person.
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
WARNING: The ability to properly perform mainte-
nance on this equipment requires certain expertise, me-
chanical skills, tools, and equipment. If you do not pos-
sess these, do not attempt to perform any maintenance
on this equipment other than those procedures recom-
mended in the User's Information Manual. FAILURE
TO HEED THIS WARNING COULD RESULT IN SE-
RIOUS PERSONAL INJURY AND POSSIBLE DAM-
AGE TO THIS EQUIPMENT.
The minimum maintenance requirements for this equipment
are as follows:
1. Inspect air filters each month. Clean or replace when
necessary.
2. Inspect cooling coil, drain pan, and condensate drain each
cooling season for cleanliness. Clean when necessary.
3. Inspect fan motor and wheel. Clean and lubricate as
necessary.
4. Check electrical connections for tightness and controls
for proper operation each heating and cooling season.
Service when necessary.
5. Check and inspect accessory electric heaters before each
heating season. Clean and adjust when necessary.
6. Check and clean outdoor-air inlet screen if needed.
WARNING: Failure to follow these warnings could re-
sult in serious personal injury:
1. Turn off electrical power to the unit before per-
forming any maintenance or service on the unit.
2. Use extreme caution when removing panels and
parts. As with any mechanical equipment, per-
sonal injury can result from sharp edges, etc.
3. Never place anything combustible either on, or in
contact with, the unit.
I. AIR FILTER
CAUTION: Never operate the unit without a suit-
able air filter in the return-air duct system. Always re-
place the filter with the same dimensional size and type
as originally installed. See Table 1 for recommended fil-
ter sizes.
Inspect air filters at least once each month and replace
(throwaway-type) or clean (cleanable-type) at least twice dur-
ing each heating and cooling season, or whenever the filter(s)
becomes clogged with dust and lint.
When necessary, replace filters with the same dimensional
size and type as originally provided.
CAUTION: When servicing unit, shut off all electri-
cal power to unit to avoid shock hazard or injury from
rotating parts.
I. CLEANING
Inspect unit interior at the beginning of each heating and cool-
ing season and as operating conditions require.
A. Evaporator Coil
1. Turn unit power off. Remove evaporator coil access panel.
2. If accessory economizer is installed, remove economizer
by disconnecting Molex plug and economizer mounting
screws. Refer to Optional Economizer sections on
page 13 or Accessory Economizer Installation Instruc-
tions for further details.
3. Slide filters out of unit.
4. Clean coil using a commercial coil cleaner or dish-
washer detergent in a pressurized spray canister. Wash
both sides of coil and flush with clean water. For best
results, backflush toward return-air section to remove
foreign material.
5. Flush condensate pan.
6. Reinstall economizer and filters.
7. Reconnect wiring.
8. Replace access panels.
B. Condenser Coil
Inspect coil monthly. Clean condenser coil annually, and as
required by location or outdoor-air conditions.
One-Row Coils (sizes 036-060)
To access one-row coils, remove screws securing condenser-
fan grille to condenser coil top cover. Place grille on top of
condenser coil top cover as shown in Fig. 36. It is not neces-
sary to remove the top cover.
Use a water hose or other suitable equipment to remove dirt
and debris. Clean the outer surfaces with a stiff brush in the
normal manner.
Reverse the procedure outlined above to reinstall the condenser-
fan grille and condenser coil top cover.
—28—
SERVICE
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