AADCO 737 Series Operating Instructions Manual page 29

13.3 Continued.
NOTE: There is an inaccessible thermal switch located within the body of the
compressor motor which will cause the compressor to shut down
should it begin to overheat. The compressor should begin operating
within fifteen minutes after removing the cover from the compressor
unit. This allows the compressor to cool without cooling fans.
(b) If the compressor has stopped due to overheating, a visual check should
be made of the plastic louvered shroud, Figure 8, on the front of the
compressor to confirm that it has not become distorted due to overheating.
PERFORM THIS INSPECTION WITH POWER CORD DISCONNECTED
IN THE EVENT COMPRESSOR COOLS ENOUGH TO START. If it is
distorted, remove the shroud by loosening the four screws holding it in
place and check that the four blade fan inside has not been damaged due
to the distortion. Replace one or both, if needed. See Section 18.0, Parts
List.
(c) If the fan is not defective and the compressor has not overheated but will
not start, replace compressor.
13.4 DEPRESSING THE PUMP SWITCH, AS IN SECTION 13.2, THE PUMP
SWITCH LAMP DOES NOT LIGHT. Depress POWER switch confirming that
power is present because if power is present POWER switch lamp should light
as well as the METHANE HEAT lamp, and the cooling fan should operate. If
not, circuit breaker is out and there is no power to unit. Restore breaker. If
breaker okay, check power cord connections.
(a) Check PUMP fuse. PUMP fuse blown. REMOVE POWER CORD FROM
WALL OUTLET BEFORE CHECKING OR CHANGING FUSES. Replace
fuse with 15-amp SLOBLO. (Use 8-amp if 220V operation.) Must be
SLOBLO. Compressor should start.
NOTE: The PUMP fuse will blow if the compressor starting current becomes
abnormally high. This will be due to: (a) the compressor having to
start against pressure, See (1) below, (b) the compressor getting too
warm because the cooling fans in the silencer housing have quit, See
Section 13.3 (a), or (b) a short in the compressor itself, see (2) below.
(1) The compressor pressure relief valve, Figure 8 (23), is installed in
every unit to avoid having the compressor start against any pressure.
To confirm that the compressor pressure relief valve is functioning
properly: when the compressor is running, the ballast tank will fill to
80-psig and turn off. At that instant when the compressor turns off,
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