Finish Thompson BE-15/15C - Manual (Page 16)

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1. Vacuum/circulation Pump motor is not coming on.
 For units E91 or older, the motor is supposed to run as soon as the unit is turned on.
 For units F91 to E92, the motor is supposed to run after the Process Tank reaches 180 and TAS1
has closed (usually about one hour after starting the unit).
Check the pump motor’s contactor in the unit’s circuit box (upper right contactor). There should be 240
volts at wires #8 and #9 when the contactor is engaged. If the contactor is not engaged, verify there is
120 volts to the coil (wires #18 and #19). If so, the coil is defective, and the contactor needs replaced.
If there is no power to the coil, TAS1 has not closed.
If the pump motor’s contactor is functioning, determine whether the pump motor is defective. Attempt to
turn the motor’s fan with a screwdriver’s blade. If the fan won’t turn, the motor’s bearings may have
seized. Replace the motor or have it rebuilt. Refer to the “Vacuum/circulation Pump Servicing”
section of this manual.
 For units F92 or newer, the motor is supposed to run as soon as the unit is turned on.
Check the contactor in the unit’s circuit box. There should be 240 volts at wires #8 and #9 when the
contactor is engaged. If the contactor is not engaged, verify there is 240 volts to the coil (wires #13
and #18). If so, the coil is defective, and the contactor needs replaced. A defective contactor would
also prevent the unit from heating.
If the pump motor’s contactor is functioning, determine whether the pump motor is defective. Attempt to
turn the motor’s fan with a screwdriver’s blade. If the fan won’t turn, the motor’s bearings may have
seized. Replace the motor or have it rebuilt. Refer to the “Vacuum/circulation Pump Servicing”
section of this manual.
Cooling system problems with a BE-15C Chiller:
1. Pump Reservoir is low. This is the most common cause. The reservoir only needs to be about 1/2”
low to cause poor coolant circulation through the Condenser. Top off the reservoir until it overflows
from the Processed Glycol Hose.
2. Unit installed in too warm of an area. If the ambient temp around the BE unit gets above 100
F, then
the unit can overheat. Verify good, cool ventilation in the installation area.
3. Freon is low or leaking. Locate the sight glass on the compressor. Determine whether there is
moisture in the system by the color indicator. Also check for air bubbles passing through the sight
glass while the unit is running. The “Chiller” should maintain the liquid in the Pump Reservoir to a
temperature no higher than 110°. If signs of trouble exist, have a qualified HVAC technician service
the compressor. This unit requires four pounds of R-22 Freon.