User`s manual

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32
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I. AIR FILTER
Inspect air filters at least once each month, and replace
(throwaway-type) or clean (cleanable-type) at least twice
during each heating and cooling season and whenever the fil-
ters become clogged with dust and lint.
Replace filters when necessary with the same dimensional
size and type as originally provided.
SERVICE
I. CLEANING
Inspect unit interior at the beginning of each heating and
cooling season or more frequently as operating conditions
require.
A. Evaporator Coil
1. Turn unit power off and tag disconnect. Remove
evaporator coil access panel.
2. If economizer is installed, remove economizer by dis-
connecting Molex plug and economizer mounting
screws. Refer to Accessory Economizer Installation
Instructions or Optional Economizer Installation sec-
tions on pages 13 and 16 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. Caution should be taken
as to not overflow the evaporator drain condensate
pan.
5. Flush condensate pan after completion.
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 and outdoor-air conditions.
One-Row Coils
Wash coil with commercial cleaner. Clean outer surfaces
with a stiff brush in the normal manner. It is not necessary
to remove top panel.
Two-Row Coils
Clean coil as follows:
1. Turn off unit power and tag disconnect.
2. Remove top panel screws on condenser end of unit.
3. Remove condenser coil corner post. See Fig. 50. To
hold top panel open, place coil corner post between
top panel and center post. See Fig. 51.
4. Remove screws securing coil to center post.
5. Remove fastener holding coil sections together at
return end of condenser coil. Carefully separate the
outer coil section 3 to 4 in. from the inner coil section.
See Fig. 52.
6. Use a water hose or other suitable equipment to flush
down between the 2 coil sections to remove dirt and
debris. Clean the outer surfaces with a stiff brush in
the normal manner.
7. Secure inner and outer coil rows together with a field-
supplied fastener.
8. Reposition the outer coil section and remove the coil
corner post from between the top panel and center
post.
9. Reinstall the coil corner post and replace all screws.
II. LUBRICATION
A. Compressors
Each compressor is charged with correct amount of oil at the
factory.
B. Fan-Motor Bearings
Fan-motor bearings are of the permanently lubricated type.
No further lubrication is required. No lubrication of con-
denser-or evaporator-fan motors is required.
III. CONDENSER FAN ADJUSTMENT (Fig. 53)
1. Shut off unit power supply and tag disconnect.
2. Remove condenser-fan assembly (grille, motor, motor
cover, and fan).
3. Loosen fan hub setscrews.
4. Adjust fan height as shown in Fig. 53.
5. Tighten setscrews.
6. Replace condenser-fan assembly.
IV. BLOWER BELT ADJUSTMENT
Inspect blower belt for wear and proper belt tension, and
pulley alignment at the beginning of each heating and air
conditioning season.
CAUTION: Never operate the unit without a suit-
able air filter in the return-air duct system. Always
replace the filter with the same dimensional size and
type as originally installed. See Table 1 for recom-
mended filter sizes.
CAUTION: When servicing unit, shut off all elec-
trical power to unit to avoid shock hazard or injury
from rotating parts.
Fig. 50 — Cleaning Condenser Coil