Finish Thompson BE-55C - Manual (Page 18)

17
PROBLEM: CIRCUIT BREAKER AT POWER MAIN KEEPS TRIPPING
Possible Cause 1: Wiring short to ground
Check all wires for continuity to ground.
CAUTION: Disconnect electrical power to the BE unit before performing continuity tests on
the circuitry of the BE unit.
Systematically, check every wire connection for continuity to ground. The majority of the wires are
terminated in the circuit box inside the unit. Also check the wires on the On/Off switch and all TAS’s.
The only wires in the entire electrical circuitry of the BE unit that should be grounded are wires
#22 and #23 from the Level Control Boards. Any other problems or electrical shorts to ground must
be eliminated or damage to electrical components will reoccur.
PROBLEM: AUTOFILL NOT FUNCTIONING
Possible Cause 1: The tank is already full.
Check the status of the LED on the High Level Control Board.
 If LED is lit, the unit is full or the High Level Control Boards probe has become grounded. Unplug
wire #22, the LED should turn off:
1. If it doesn’t, the High Level Control Board is bad.
2. If it does, the unit is already full or the level probe in the top of the tank is sensing liquid (the probe
could be bad or debris could cause it to have a ground path to the tank).
Possible Cause 2: Tripped Switch
CAUTION: Disconnect electrical power to the BE unit before performing tests on
the temperature activated Switches (TAS)
 Check if the overload on the Pump and Fans motor overload is tripped (red pin), if so, reset.
 Check to see if TAS2 (System Over-Temp) has tripped, this is a “normally closed” switch. If the
switch is tripped, refer to the “Process Tank Overheating” section on page 20-21.
 Check to see if TAS4 (Distillate Over-Temp) has tripped, this is a “normally closed” switch. If the
switch is tripped, refer to “TAS4 keeps tripping due to cooling problems” section on page 22.
Possible Cause 3: Low or no vacuum being created.
Refer to the PROBLEM: “Low Vacuum Reading” section on page 19.
Possible Cause 4: Not allowing adequate time for vacuum to build up before opening the
ball valve in the fill line.
 Allow vacuum to build up to at least –10 in. Hg before opening the ball valve. Allow a couple of
minutes for the vacuum to create flow.