AADCO 737 Series Operating Instructions Manual page 30

there should be a sudden expulsion of air from the compressor
pressure relief
13.4 (a) (1) Continued.
valve, Figure 8 (23).
connecting tubing by this valve so that on compressor restart this
tubing will be at ambient pressure.
starting current. If there is no expulsion of air from the compressor
pressure relief valve when the compressor is off, replace the
compressor pressure relief valve.
In addition, if this air expulsion continues for more than a few
seconds the check valve, Figures 1, 2 and 9 (24), is probably
defective. To confirm, depress the POWER switch to the off position.
The input pressure as shown on the INPUT PRESSURE gauge
should remain at that pressure which was evident the moment the
POWER switch was depressed. If the input pressure continues to
decrease, replace the check valve.
Further confirmation that the check valve is defective: with some
pressure in the ballast tank, turn the POWER switch off and
disconnect the metal tubing, Figure 2 (53), at the check valve,
Figures 1,2 and 9 (24), connect a short piece of plastic tubing to the
check valve and immerse the free end in a cup of water. If air
bubbles are present, replace the check valve.
released from the tank.
(2) To determine if there is a short in the compressor, REMOVE THE
POWER CORD FROM THE WALL OUTLET and disconnect the
black lead at terminal #2 of the solid state relay. If the PUMP fuse
blows when this lead is connected and does not blow when
disconnected, replace the compressor. BE CERTAIN TO REMOVE
THE POWER CORD FROM THE WALL OUTLET WHEN
CHECKING OR CHANGING FUSES.
13.5 If a routine check, as in Section 12.5, reveals that the compressor does not
reach 80-psig within thirty seconds, starting at 60-psig, as observed on the
INPUT PRESSURE gauge, with the POWER switch on and the generator unit
operating, then the compressor should be replaced. It is mandatory that this
input pressure be available to the purification reactor for proper operation.
(a) A further check can be made by turning off the POWER switch and
allowing the compressor to fill the ballast tank until the input pressure
This represents a bleeding of air from the
This insures no increase in
No air should be
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