Finish Thompson BE-55C - Manual (Page 22)

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Possible Cause 5: Intermittent ground on Process Tank.
Verify that there is more than 7-8 gallons of liquid in the Process Tank and check the red LED on the
Low Level Control Board (located in the upper left corner, second level control board in the BE’s circuit
box).
 If the LED is not lit, check the Process Tank’s ground wire connection. This wire is attached to the
Process Tank with a screw (behind the small access panel in the tank’s insulation). This
connection can become corroded and not allow the Level Control to function. Remove the screw,
file the metal clean, and re-attach the wire with a new screw and new crimp connector.
If the screw is too corroded to remove, drill and tap a new hole for the ground into the same metal
slab, next to the old screw.
CAUTION: Do not drill a hole into or through the Process Tank.
Drill into the welded metal slab only. Maximum drill depth is 1/4”.
 If the LED on the Level Control Board is lit, the unit should turn on (if the Distillate Piping is cool).
An intermittent connection can be difficult to detect. Watch for flickering of the LED, or attempt to
check the LED as soon as the unit shuts off (prematurely).
PROBLEM: A BATCH TAKES LONGER THAN 24 HOURS TO PROCESS.
Possible Cause 1: High Water Content
 Higher than 50% water concentration in the waste coolant. Measure the freeze point of the waste
coolant to verify (-34
F / -37ºC freeze point equals 50% water/glycol mixture).
Possible Cause 2: Lower than 240-volt power supply (under load)
 Use a buck/boost transformer (autotransformer) to raise the voltage to 240 volts.
Possible Cause 3: TAS4 keeps tripping due to cooling system problems
CAUTION: Disconnect electrical power to the BE unit before performing tests on
the temperature activated Switches (TAS)
Check TAS4. This is a “normally closed” switch threaded into the Distillate Piping between the
Condenser and the Divert Solenoid Valve. It is a 1/2” diameter white ceramic sensor with a brass hex
head base and two wires (#18A and #18) connected to it (it may be covered with a black plastic
sheath), check continuity between these two wires.
NOTE: If the Fill Switch illuminates during the process while it is in the OFF position, the distillate
overtemp switch (TAS4) has activated. This indicates that the unit is in a cool-down mode. The
process will resume when the distillate temperature cools.
 If the unit is cool and there is continuity between the two terminals of TAS4, then the switch is o.k.
 If the unit is cool and there is not continuity between the two terminals of TAS4, the switch has
tripped and hasn’t reset (replace).