Form 924 (05.18) ©SOR Inc.
11/16
Contact the factory for the correct replacement circuit board (Model number required).
Disconnect power to the unit.
Remove the housing cover.
Remove two screws holding bracket to plastic holder
Slide out PC board.
Disconnect power wiring, sensor wire, and the ground connection to the housing.
Connect the sensor lead from the new board to the probe. Connect ground to the
housing.
Slide the new board into the control housing.
Replace the two screws in the circuit board bracket to the plastic holder. These screw
are self-tapping. Do not over–tighten
Reconnect power and replace the housing cover.
Circuit Board Replacement
Disconnect power to the unit.
Remove the housing cover.
Unplug the varistor(s) (RV1, RV2, RV3) located on the opposite side of the circuit
board from the wiring terminals. (See
)
).
Plug in replacement varistor(s).
Replace the housing cover. Re-connect power to the unit.
Use the replacement varistor per the following chart:
Varistor Replacement
Control Model
Number
Varistor Part
Number
Quantity
Location
681
5
2820-015
1
RV1
681
6
2820-015
1
RV1
681
7
2820-003
3
RV1, RV2, RV3
681
8
2820-004
3
RV1, RV2, RV3
