Table 4-3. Unit Troubleshooting.
TEST OR INSPECTION
Using wiring diagram Figure 1-4, check individual wires for tightness
Tighten, repair, or replace as indicated.
Check operation of fan motor relay (K8).
Check operation of mode selector switch.
Check operation of fan motor.
Test motor. Replace per para. 4-32.
EXCESSIVELY NOISY OPERATION.
If a knocking or hammering sound
immediately. Such noise is usually
caused by liquid refrigerant in
c o m p r e s s o r which can seriously
Contact your supervisor.
Check fans for looseness or damage, and for rotational clearance.
Tighten loose fans, adjust rotational clearance, or replace fans per
Check all internal components for looseness, vibration, and security.
Tighten, adjust, and secure as necessary.
If unit is still noisy, notify supervisor.