Pressure Switch
Part Number
600 30266
Function
Control filling of wash tank and protect wash elements.
Description
The pressure switch is attached to the pressure bell. As the water level in the wash tank
rises air is trapped in the bell and increasing pressure is transmitted to the pressure switch.
When the tank is full the upper pressure switch shuts off the fill solenoid valve and switches
on the wash elements. When the water level in the tank drops below the reset level of the
lower pressure switch the wash elements are switched off and the fill solenoid valve starts
refilling the tank. Using two pressure switches allows greater water level differential so that
the tank level may drop with the operation of the wash pumps, without causing refilling of
the machine.
Diagram
LEVEL ADJUSTING SCREW
CW rotation increases upper level
setting
DIFFERENTIAL SCREW
CW rotation increases
differential and reduces lower
level settings
Adjustment
Before making any adjustments drain wash tank, remove pressure tube from pressure bell,
blow gently into tube to check switching of pressure switch and then fit tube back.
Turn the power switch on, machine should start to fill. The machine should cease filling
when the water attains a level about 10mm below an overflow level of the upstand. Adjust
fill level if necessary by Level adjusting screw on the upper pressure switch.
Remove drain upstand to begin draining the wash tank. Fit back the upstand when Wash
Ready light goes off and measure the refill water level. A refill level should be set 15-25mm
above the wash element. Adjust if necessary by Differential screw on the lower pressure
switch. Close door to refill the wash tank and re-check the fill level.
Replacement
To remove the switch take note of the electrical connections and remove the wires. Slide
the switch from the mounting bracket and remove the rubber tube from the switch
connector. Replace in reverse order. Whilst in the process of replacing the pressure switch,
ensure that the pressure tube is in good order and clear of obstruction.
IMPORTANT
Ensure the tube from the air bell always goes up to the pressure switch.
Do not use thin wall vacuum tube for replacement.
To Next Page
Loading...
