Table of Contents
Advertisement
C. Cooling, Units without Economizer
When thermostat calls for cooling, terminals G and Y1 are
energized. The indoor (evaporator) fan contactor (IFC), com-
pressor contactor and outdoor (condenser) fan contactor
(OFC) are energized and evaporator-fan motor, compressor
no. 1, and condenser fan start. The condenser-fan motor runs
continuously while unit is cooling. After Y1 is satisfied on
PA1R036-060 units, the evaporator fan remains energized for
30 seconds.
D. Accessory Heating, Units without Economizer
Upon a call for heating through terminal W1, IFC and heater
contactor no. 1 (HC1) are energized. On units equipped for 2
stages of heat, when additional heat is needed HC2 is ener-
gized through W2.
SERVICE
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 or as operating conditions require.
A. Evaporator Coil
Inspect and clean coil prior to each heating and cooling sea-
son, and as required by location.
1. Turn unit power off. Remove evaporator coil access panel.
2. If economizer is installed, remove economizer by dis-
onnecting Molex plug and removing economizer mount-
ing screws. Refer to Accessory Economizer Installation
Instructions, or Durablade Economizer section on
page 12 for more 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 and 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. 27. 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 fan top cover.
Two-Row Coils (size 072) (see Fig. 28)
NOTE: Save all screws removed in this section. The screws
must be used when reinstalling the equipment.
1. To access 2-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. 29. It is
not necessary to remove the top cover.
2. Remove 3 screws on right side of compressor access panel.
Remove one screw securing condenser coil top cover to
compressor access panel. Remove lower screw secur-
ing condenser coil to compressor mounting plate.
3. Remove 4 screws securing control box access panel. Re-
move 3 screws (located in front of the control box
access cover) securing condenser coil top cover.
4. Remove screws securing low-voltage access panel. Re-
move 2 screws inside low-voltage access panel. Tilt sheet
metal (located on left side of low-voltage connections)
back 45 degrees.
5. Remove screw securing refrigerant service port access
panel.
6. Remove 2 U-clips securing 2-row coils together at hair-
pin end.
7. Remove screws securing 2 corner posts. Remove 2 cor-
ner posts.
8. Use right corner post to prop up right side of con-
denser coil top cover. Slide condenser coil partially out
of condenser fan housing. See Fig. 29.
9. Use left corner post to prop up left side of condenser
coil top cover.
10. Carefully separate the outer coil section 3 to 4 in. from
the inner coil section. See Fig. 35.
11. 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.
12. Secure inner and outer coil together with U-clip.
13. Reposition the outer and inner coil section.
14. Reverse the procedure outlined above to reinstall
equipment.
C. Condensate Drain
Check and clean each year at start of cooling season. In win-
ter, keep drain dry or protect against freeze-up.
D. Filters
Clean or replace at start of each heating and cooling season,
or more often if operating conditions require it. Replacement
filters must be same dimensions as original filters.
II. LUBRICATION
A. Compressors
Each compressor is charged with the 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 condenser-
or evaporator-fan motors is required.
—25—
Advertisement
Table of Contents
