Finish Thompson BE-55C - Manual (Page 19)

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Possible Cause 5: Stuck/Faulty Divert Solenoid Valve.
Determine whether the Divert Valve is stuck between two positions. During normal operation, the
Distillate Piping is open and at atmospheric pressure during the process. Once the fill process begins,
the Divert Valve switches positions to allow the Distillate Piping and the Process Tank to be under
vacuum.
 If the unit “belches” while filling the Process Tank or reads a partial vacuum during the water
process, the Divert Solenoid Valve is stuck between two positions. A stuck Divert Valve can allow
air to enter through the process Water Hose during the vacuum portion of the cycle.
Refer to the “Service Procedures: Divert Valve Repair or Replacement” section on page 29 for further
instruction on servicing the Divert Valve.
Possible Cause 6: Fill Control Relay is Defective
When the Auto-Fill switch (SW2) is depressed it should energize the fill control relay (CR2) causing
relay contacts CR2-3 to close, which in turn will activate contactor C3. This will turn on the pump and
fan motors.
 Activate the Auto-Fill switch repeatedly and visually inspect CR2 for proper operation. The opening
and closing of the relay contacts should be noticeable. If the relay appears to be operating, check
for 240V between wires #12 and #18 at relay CR2. If the relay does not operate or the voltage is not
detected, replace the relay.
PROBLEM: LOW VACUUM READING (LESS THAN –19”Hg)
Possible Cause 1: Pump Reservoir is Low
 The reservoir only needs to be about 1/2” low to diminish coolant flow through the Aspirator. Fill
pump reservoir with either FTI pump primer or water until the fluid overflows from the Processed
Glycol Hose.
Possible Cause 2: Vacuum Hose Leaking or Deteriorated
 Three hoses are subjected to the vacuum generated by the circulation pump. One (red) is for the
vacuum gage and the other two (black) transmit the vacuum from the aspirator to the divert valve
and then to the condenser. These hoses should be inspected for cracks, wear, or weakness
periodically. If there are leaks or if the hoses collapse under vacuum, lower than acceptable
vacuum will result. Replace any suspect hoses. The two black hoses are special reinforced heater
hoses, please call the factory for part numbers if they need to be replaced.