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33
SERVICE
Cleaning —
Inspect unit interior at the beginning of heat-
ing and cooling season and as operating conditions require.
EVAPORATOR COIL
1. Turn unit power off, tag disconnect. Remove evaporator
coil access panel.
2. If economizer or two-position damper is installed, re-
move economizer by disconnecting Molex plug and re-
moving mounting screws. Refer to accessory economizer
installation instructions or Optional Economizer sections
on pages 12 and 15 for additional information.
3. Slide filters out of unit.
4. Clean coil using a commercial coil cleaner or dishwasher
detergent in a pressurized spray canister. Wash both sides
of coil and flush with clean water. For best results,
back-flush toward return-air section to remove foreign
material. Flush condensate pan after completion.
5. Reinstall economizer and filters.
6. Reconnect wiring.
7. Replace access panels.
CONDENSER COIL — Inspect coil monthly. Clean con-
denser coil annually, and as required by location and outdoor
air conditions.
One-Row Coil
— Wash coil with commercial coil cleaner. It
is not necessary to remove top panel.
2-Row Coils
Clean coil as follows:
1. Turn off unit power, tag disconnecct.
2. Remove top panel screws on condenser end of unit.
3. Remove condenser coil corner post. See Fig. 40. To hold
top panel open, place coil corner post between top panel
and center post. See Fig. 41.
4. Remove screws securing coil to compressor plate and
compressor access panel.
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. 42.
6. Use a water hose or other suitable equipment to flush
down between the 2 coil sections to remove dirt and de-
bris. Clean the outer surfaces with a stiff brush in the nor-
mal manner.
7. Secure inner and outer coil rows together with a field-
supplied fastener.
8. Reposition the outer coil section and remove the coil cor-
ner post from between the top panel and center post. Re-
install the coil corner post and replace all screws.
CONDENSATE DRAIN — Check and clean each year at
start of cooling season. In winter, keep drain dry or protect
against freeze-up.
FILTERS — Clean or replace at start of each heating and cool-
ing season, or more often if operating conditions require it. Re-
placement filters must be same dimensions as original filters.
OUTDOOR-AIR INLET SCREENS — Clean screen with
steam or hot water and a mild detergent. Do not use disposable
filters in place of screen.
Lubrication
COMPRESSORS — Each compressor is charged with correct
amount of oil at the factory.
FAN MOTOR BEARINGS — Fan motor bearings are of the
permanently lubricated type. No further lubrication is required.
No lubrication of condenser- or evaporator-fan motors is
required.
When servicing unit, shut off all electrical power to unit to
avoid shock hazard or injury from rotating parts.
Fig. 40 — Cleaning Condenser Coil
Fig. 41 — Propping Up Top Panel
Fig. 42 — Separating Coil Sections