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It is recommended to conduct this sequence check in the auto fi ll cycle after draining the
wash tank and booster tank. See “II.C. Sequence of Operation” for further details.
1) Use the “ON/OFF” button on the operation panel to turn off the unit.
2) Pull out the overfl ow pipe to drain the wash tank.
3) Drain the booster tank through the drain hose.
4) Replace the overfl ow pipe and drain hose in their correct positions.
5) Enter the switch open/closed display mode according to the above procedure.
6) Auto Fill Cycle
a. After the service panel is closed and the “ON/OFF” button is pressed, the inlet water
valve in the booster tank opens in 10 seconds to start water supply.
b. After a while, the booster tank water level float switch closes, segment C in the
display comes on, and the inlet water valve closes to stop water supply.
c. The rinse pump starts to feed water to the wash tank. When the booster tank water
level goes down, the water level fl oat switch opens, segment C in the display goes
off, and the inlet water valve opens to start water supply.
d. After the rinse pump is energized for a preset time to fi ll the wash tank, the wash
tank water level sensor closes, and segment E in the display comes on.
e. In normal operation, the booster tank backup water level fl oat switch does not close,
and segment A in the display stays off. If the booster tank water level fl oat switch
fails or the booster tank water level reaches the overfl ow level, segment A comes on.
7) Wash Cycle/Rinse Cycle
a. When a rack is loaded from the wash compartment entrance and the wash start
switch closes, segment B in the display comes on and the wash pump starts the
wash cycle for a preset time. When the conveyor moves the rack forward and the
wash start switch opens, segment B goes off and the wash pump stops after the
preset time. Segment E in the display stays on.
b. If the booster tank is below the predetermined water level, segment C in the display
stays off. The inlet water valve stays open until segment C comes on.
c. When the wash cycle ends and the rinse start switch closes, segment D in the
display comes on and the rinse pump starts the rinse cycle for a preset time. When
the rinse start switch opens, segment D goes off and the rinse pump stops after the
preset time. When the rinse cycle starts, the booster tank water level goes down and
segment C in the display goes off. The inlet water valve stays open until segment C
comes on.
Diagnosis: If any problem is found by the above sequence check, refer to “III.B. Error
Codes,” “III.C. Service Flow Charts,” “III.D. Float Switch Check and Cleaning” and “III.E.
Thermistor Check.”