AADCO 737 Series Operating Instructions Manual page 33

observed on the OUTPUT FLOW rotameter, these symptoms indicate only one
of the solenoid valves on the inlet to the purification reactor is being energized
during the full one minute cycle or that flow through one of the solenoids is
being obstructed.
13.13 During the second half of the one-minute cycle described in Section 13.11,
there will be little or no output flow, as observed on the OUTPUT FLOW
rotameter, and little or no output pressure as seen on the OUTPUT
PRESSURE gauge. This further confirms that only one of the solenoid valves
on the inlet to the purification reactor is being energized during the full one
minute cycle or that, for some reason, flow through one of the solenoid valves
is being obstructed.
13.14 For further confirmation, it is necessary to access the electrical system; i.e.,
timers, etc. Remove the cover from the generator unit and remove the mixer-
receivers, Figures 7, 7a and 11 (49), if present.
13.15 Reconnect the power cord and, with the POWER switch on, observe whether
the timer, Figure 5 (41), is fully operational, partially operational, or not
operational.
(a) Listen for the "click" of the solenoid valves, during one full one minute
cycle of the timer. Each should be energized for alternate halves of each
cycle. If both solenoids "click" the problem is an obstruction in one or the
other solenoid valves on the purification reactor. If the purification reactor
is older than one year, replacing both of the solenoid valves is best. If the
purification reactor is less than one year old, contact the factory for a
complete purification reactor replacement under warranty.
NOTE: AADCO Instruments offers a purification reactor complete with all
valves, fittings, etc., for a discounted price with trade-in of the
depleted reactor.
If the solenoid valves do not "click", disconnect the electrical quick-
(b)
connects leading from the timer to the purification reactor valve. Measure
the AC voltage at each quick-connect leading from the timer. The voltage
should be 120V or 220V, depending upon the power source, during
alternate halves of the timer cycle.
(1) If AC voltage is not present at both quick-connects, check AC voltage
on input side of timer. If not present, check AC output of RFI filter. If
not present, replace filter.
(2) If AC voltage is present at one quick-connect but not at the other, the
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