AADCO 737 Series Operating Instructions Manual page 32

(a) Check voltage between position #2 and position #4 of terminal strip TS-1,
located on the front floor of generator unit (see Figure 18). When PUMP
switch is off, there should be no voltage. If voltage is present, PUMP
switch is defective. Replace the pump switch.
(b) If no voltage is present in (a) above, check voltage between terminal #2 of
AC solid state relay to neutral of terminal strip TS-1. If voltage is present,
relay is defective. Replace the relay.
13.8 PURIFICATION REACTOR.
13.9 If, as in Section 12.6, a one or two minute check of the rotameter reading,
Figure 4 (10), as well as the OUTPUT PRESSURE gauge, Figure 4 (6), should
both show sudden drops during a one minute observation:
13.10 If the sudden change is only momentary with recovery within a second or two, it
would indicate that the output pressure has been set too close to the low
pressure setting of the pressure switch.
REGULATOR, Figure 4 (5), to operate effectively, a pressure differential of at
least 10-psig must be maintained between these two pressure settings with the
low pressure setting of the pressure switch being the higher of the two. Since
the recommended low pressure setting of the pressure switch is 60-psig, the
maximum permissible output pressure, as set with the OUTPUT PRESSURE
REGULATOR, is 50-psig in order to maintain the 10-psig differential. If either
of the above pressure settings do not conform to this restriction, make the
necessary pressure adjustments beginning with the low pressure setting of the
pressure switch. See Section 14.0.
13.11 It should be noted that during some portion of each one minute cycle, for an
interval of about four seconds, there is no purge flow.
when either S-1 or S-2 is activated and, during the same interval, the alternate
valve is energized. Should it be that S-1 is activate, then column one would be
pressurized. The moment S-2 is energized there is a sudden demand for
pressurized air from the ballast tank to fill column two. The ballast tank at this
time may only be at 60-psig, the lower pressure setting of the pressure switch.
If, during this interval, the OUTPUT PRESSURE REGULATOR were set
between 52 and 60-psig the symptoms described in Section 13.9 will prevail.
By observing the four second
glancing at the OUTPUT PRESSURE gauge, one would notice a sudden, sharp
decrease in output pressure simultaneously. This would serve to confirm the
problem as outlined in Section 13.9.
13.12 If, for only one-half of each one minute cycle, there is full output pressure as
observed on the OUTPUT PRESSURE gauge and full pure air flow, as
For the OUTPUT PRESSURE
purge stop-flow interval and simultaneously
This period occurs
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