Water Level Control - Jackson 24P-NSU Service 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.
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, replace control.
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)
10