7–17
T-372
7.14.2
Replacing the Filter Drier:
1. Pump down the unit (see
). If the unit is not equipped with service values, evacuate the unit.
Then replace filter drier.
2. Evacuate the low side in accordance with
3. After unit is in operation, inspect for moisture in the system and check charge.
7.15 Evaporator Coil
The evaporator section, including the evaporator coil, should be cleaned regularly. The preferred cleaning fluid is
fresh water or steam. Another recommended cleaner is Oakite 202 or similar, following manufacturer’s instructions.
The two drain pan hoses are routed behind the condenser fan motor and compressor. The drain pan line(s) must
be open to ensure adequate drainage.
7.15.1
Evaporator Coil Replacement
1. Pump unit down. (See
).
WARNING
!
Always turn OFF the unit circuit breakers (CB-1 & CB-2) and disconnect main power supply
before working on moving parts.
2. With power OFF and power plug removed, remove the screws securing the panel covering the evaporator
section (upper panel).
3. Disconnect the defrost heater wiring.
4. Remove the mounting hardware from the coil.
5. Unsolder the two coil connections, one at the distributor and the other at the coil header.
6. Disconnect the defrost temperature sensor (see
) from the coil.
7. Remove middle coil support.
8. After defective coil is removed from unit, remove defrost heaters and install on replacement coil.
9. Install coil assembly by reversing above steps.
10. Leak check connections. Evacuate and add refrigerant charge.
7.16 Evaporator Heaters
Figure 7.10 Heater Arrangement
1) Heater Element
2) Bracket
3) Retainer
- - - - -
1
2
3
