Service Manual

20
III. Controls and Relays
The C-80BAJ(-C) utilizes a control switch, time delay relay, water control relay, and
compressor relay to control operation.
A. Control Switch
The control switch has 3 positions, "OFF," "ICE," and "DRAIN."
a) "OFF": All components except the optional drain pump are de-energized when the
control switch is in the "OFF" position. The optional drain pump circuit remains
energized when the control switch is in the "OFF" position.
b) "ICE": When placed in the "ICE" position, the inlet water valve energizes if upper
oat switch (UFS) is open. If upper oat switch (UFS) is closed, gear motor and
compressor energize.
c) "DRAIN": When placed in the "DRAIN" position, drain valve energizes, draining the
reservoir and evaporator.
B. Time Delay Relay
Time delay relay energizes once 115VAC is supplied to time delay relay #5 (P). Time
delay relay contacts close between time delay relay #8 (BR) and time delay relay
#9(W/R), energizing the gear motor, fan motor, and compressor. When the lower oat
switch opens, the water control relay de-energizes, de-energizing the time delay relay.
A90 sec. low water safety timer starts. Once the upper oat switch closes, the water
control relay energizes, energizing the time delay relay. The time delay relay 90 sec.
timer resets at this time. Once the 90 sec. low water safety timer is exceeded, gear
motor, fan motor, and compressor de-energize.
C. Water Control Relay
The water control relay is controlled by the oat switch. The water control relay energizes
when the reservoir is full and the upper oat switch closes. The water control relay
de-energizes when the water in the reservoir lowers and the lower oat switch opens.
When energized, the time delay relay energizes and the inlet water valve de-energizes.
Whende-energized, the time delay relay de-energizes and the inlet water valve
energizes.