Water Level Control - Jackson 24A-AF Instruction Manual

WATER LEVEL CONTROL

Function:
The water level control device is utilized on this machine to automatically control the filling of the
wash tank and the activation of the wash tank heater.
Note: All electrical checks should be made by qualified service personnel.
The control is a single probe resistance sensing device designed to maintain water level. When
water level reaches the probe and covers it, a fixed time delay of 25 seconds is initiated. When
the delay times out, the electromechanical relay energizes, opening the 'Auto/Fill' circuit and
closing the wash heater circuit. If the water level drops below the probe, the relay will de-
energize, opening the wash heater circuit and closing the 'Auto/Fill' circuit.
Symptoms of Level Control Failure:
1. 'Auto/Fill' will not shut off when water reaches the proper level. (Check sensitivity
adjustment.)
2. Machine will partially fill.
Proceed with Checkouts:
1. Remove power source to machine by moving circuit breaker to 'OFF' position.
2. Remove screws holding lower kick plate to the front of machine and locate water level
control. (See sketch below.)
3. Remove, mark and insulate (for easy replacement), wires going to pin numbers 4 and 5.
4. Re-apply power. Turn on 'ON/FILL' switch. With an insulated wire, connect jumper wire
between pins 4 and 5. (12 volt system)
5. Wait for 25 seconds. The electromechanical relay will energize. If this occurs, control can be
deemed operational; then other causes should be explored.
6. If relay doesn't operate, check GND and input voltages. Replace if needed.
7. Remove power source once again and replace wires that were removed in step three to
original pins. (See trouble shooting section for other possible causes.)
AS USED ON 24
P/N 0204400 (110V, 60 cycle)