Jackson 100 B/PRB Service Manual page 29

WATER LEVEL CONTROL
(INITIAL FILL AND WASH-HEAT CIRCUIT) P/N 0205000
FUNCTION
This control is activated when the master switch is turned on. The primary function is to automatically
control the proper initial filling of the wash tank, then to activate the wash and rinse tank heat circuit It will
also provide cutoff of the wash and rinse heat circuit, should the water be accidentally drained from the
machine (with the master switch still on). The master switch should be turned off before draining.
This water level control is used in conjunction with two probes (sensors), master switch, fill
switch, rinse relay, thermostat(s). heat relay(s), solenoid or rinse motor.
When the master switch is turned on, the normally closed circuit in the plug-in relay is energized. As the
fill switch is pushed upward and released, the rinse relay contacts close, and the solenoid (or rinse pump on
PRB model) opens and water flows into wash tub. As the water rises in the wash tub, it will cover first the
lower probe (directly above wash element) then reach the upper probe. At this time, the plug-in relay coil will
be activated and open the normally closed contacts, de-energizing the solenoid (or rinse pump).
Simultaneously, the contacts will close on the normally open circuit, energizing the wash-rinse heat circuit.
(Checkout and information concerning that part of the circuit are in the wash heater system or rinse heater
system instruction page of this manual.)
If the water should be drained from the machine while the master switch is still on, the lower probe
will sense the lack of water and de-energize the plug-in relay, which will de-energize the wash-rinse heat
circuit. DO NOT DEPEND ON THIS - - always turn master switch off before draining.
SYMPTOMS OF LEVEL CONTROL FAILURE:
1. Fill does not take place unless rinse switch is held upward until full.
2. Initial fill does not stop when it reaches overflow, but continues.
3. Wash-rinse heat circuit does not activate.
4. Wash heater remains on (if wash water accidentally emptied with master switch on.)
PROCEED WITH CHECKOUT:
1. Remove power to machine by turning customer circuit breaker to its "off" position. Turn machine
circuit breaker, located on right side on control box. to "off".
2. Remove 4 screws holding control panel on control box. Remove panel and attach to one side of
control box with 2 screws, with back side facing toward you.
3. Locate initial fill and wash-heat circuit water level control board and disconnect wires going to
terminals marked C, H, and L. Mark and insulate wires for replacement.
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