Pressure Switch Adjustment
Individual pressure switches are provided on both the main and overflow pumps to
indicate when the filters are beginning to become loaded. These switches are
manually adjustable. The following procedure assumes clean filters are installed:
CAUTION: Eye protection should be worn for the duration of this procedure.
1. Remove the front compartment panel by turning the two black fasteners ½ turn
counterclockwise. Tilt the panel out from the top, then lift up to remove it.
2. Turn the pumps on using the switch on the Operations screen.
3. Ensure that a good spray pattern is present at both spray bars (it will be
necessary to depress the spring-loaded cover to observe the spray bars.)
4. Observe the indication of the filter change indicators on the Operations screen.
5. The indicators will either indicate [OK] (green) or [CHANGE] (red).
6. Beginning with the main loop, locate the pressure switch PS1 on the left hand
pump. (See Fig. 9).
7. If the indicator for the [MAIN FILTER] is indicating [CHANGE] turn the
plastic wheel on PS1 CCW (toward lower pressure) until it changes to [OK].
8. While someone is observing the rear spray nozzles, slowly close valve V2 (at the
bottom rear of the compartment) to restrict the flow and simulate filter loading.
At the exact point when visible reduction in flow is noted, stop.
9. Turn the thumbwheel on pressure switch PS1 CW (toward higher pressure) so
that the [MAIN FILTER] indicator turns to [CHANGE]. Back off ½ turn.
10. Reopen valve V2 to full open. Verify that the status indicator changes back to
[OK]. The switch is now properly adjusted and will indicate when a filter
change is needed.
11. Perform the same procedure on the overflow loop. Locate the pressure switch
PS2 on the pump at the right side of the front compartment. (See Fig. 9).
12. If the indicator for the [OVRFLO FILT] is indicating [CHANGE] turn the
plastic thumbwheel on PS2 CCW (toward lower pressure) until it changes to
[OK].
13. While observing the front spray nozzles, slowly turn valve V1 (at the upper
center of the compartment) clockwise to restrict the flow and simulate filter
loading. At the exact point when visible reduction in flow is noted, stop.
14. Adjust the thumbwheel on pressure switch PS2 CW (toward higher pressure) so
that the indicator just turns to [CHANGE]. Back off ½ turn.
15. Reopen valve V1 fully open. Verify that the [OVRFLO FILT] indicator
changes back to [OK]. The switch is now properly adjusted and will indicate
when a filter change is needed.
16. Replace the front compartment panel.
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