ELECTRICAL OPERATION
COMPONENT FUNCTION
Control Board ........ Controls operation of dishwasher.
F1 ..................... 2.5A slow blow fuse. Provides over current protection for 120VAC control circuit.
F2 ..................... 0.5A slow blow fuse. Provides over current protection for fill valve (1SOL).
F4 ..................... 1.25A slow blow fuse (3-phase and 1-phase/2-wire units only) . Provides over current
protection for primary of transformer (2T).
Power Supply
Board .................
Manages power supply and distributes to control board and other components.
Power Supply Board
Fuse (F1) .............
1.0A slow blow fuse. Provides over current protection for 12VAC supply.
Keypad ............... Provides user interface to control board.
Display Module ....... Visual display shown in window of keypad. Shows machine operation and programming.
Transformer (1T) . . . . . Transforms primary voltage down to secondary voltage (24VAC).
Transformer (2T) . . . . . Steps down primary voltage to 120VAC for control circuit. (3-phase and 3-wire units only)
Relay (1CR) ........... Controls power to sump heater (1HTR).
Sump Heater
(1HTR) ................
Heats water in sump.
1TAS/2TAS ........... Sump high limit protection.
1PRS Water Level
Sensor ................
Supplies mV reading for water level in sump. Acceptable range: 500 - 850 mV.
Contactor (1CON) ..... Controls power to booster heater. (SU-H only)
Booster Heater
(2HTR) ................
Heats water in booster for hot rinse cycles. (SU-H only)
Booster Thermistor
(3QTM) ................
Booster temp sensor. (SU-H only)
Sump Thermistor
(1QTM) ................
Sump temp sensor. (Surface mounted)
3TAS/4TAS ........... Booster high limit protection. (SU-H only)
2PRS Water Level
Sensor ................
Supplies mV reading for water level in booster. Acceptable range: 500 - 1400 mV.
Soft Start (Q16) ....... Control Soft Start on the wash pump motor.
Wash Pump Motor
(1MTR) ................
Drives wash pump, which pumps for wash and autoclean cycles.
Rinse Pump Motor
(2MTR) ................
Drives rinse pump, which pumps water for rinse cycle and fill cycle.
Rinse Probe
(2QTM) ................
Monitors rinse water temperature.
Fill Valve (1SOL) ...... When energized, allows water to enter the holding tank or booster.
SG, SU-L, SU-H DISHWASHERS - ELECTRICAL OPERATION
F45577 (1215) Page 34 of 59
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