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07610-002-41-09-F
28
SERVICE
PROCEDURES
The wash heater water level control is used on this machine in conjunction with a sensor,
master switch, and thermostat; all of which help control the action of the wash tank heater.
The wash heater water level control is energized when the master switch is turned on.
When the water level decreases in the wash tank, the sensor (probe) sends a signal to
the control which deactivates the plug-in relay (located on the control circuit board). When
the relay deactivates, one set of its contacts returns to a normally open position. The
thermostat and wash heater are connected in series with these contacts and at this time
de-energize the wash tank heat circuit (thermostat and wash heaters). When the proper
water level is restored, the relay reactivates and closes the normally open contacts to
energize the wash-heat circuit. NOTE: the master and heater switches must be on and
the wash tub full to the probe level for the wash-heat circuit to work.
SYMPTOMS OF LEVEL CONTROL FAILURE:
1. Wash-heat circuit not energized by control. (Wash temperature not maintained by
heater.)
2. Wash heater stays on with machine master and heater switch on, yet there is no
water in the wash tub.
PROCEED WITH CHECKOUT
(refer to diagram on next page):
1. Remove power to machine by turning circuit breaker to its “OFF” position.
2. Remove the 4 screws holding the control panel on the control box. Remove panel
and attach to one side of control box with 2 screws.
3. Locate wash-heat water level control board and disconnect wires going to terminals
marked C and H. Mark and insulate wires for replacement.
4. Re-apply power to machine. With an insulated jumper wire, touch jumper between
terminals C and H; relay in clear plastic cube should activate as wire is touched to
terminals. Observe relay contacts, they should pull in.
5. If relay operates, the control can be deemed operational and other causes should
be explored (wash element open or shorted or the thermostat is defective/needs
adjustment). See page 23 for checkout.
6. If relay does not operate, replace control to see if voltage is being applied to L1 - L2
marked on control.
7. In any case, always locate sensor (probe) inside wash tub and clean off all deposits
(instruct customer that this should be done on a weekly basis).
8. Other checks can be made using the wash tank heater system checkout shown on
page 26.
9. Remove power to machine and replace wires that were removed in the steps
above.
WATER LEVEL
CONTROL
SENSOR, LUNDY PROBE
WATER LEVEL CONTROL
Содержание 10 Series
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