Component Repair And Replacement; Pressure Reducing Valve (Prv) Adjustment - Insinger USN-72 Technical Manual

5.3 Component Repair and Replacement
Part 5.3
contains instructions for the adjustment, repair, and replacement of components which may
require service due to normal wear and tear. The following procedures should only be performed by
qualified service personnel.
THE FOLLOWING CAUTION AND WARNINGS MUST BE FOLLOWED AT ALL TIMES:
CAUTION:
Only qualified service personnel should perform adjustments and repairs to the dishwashel:
WARNING:
When repairing a circuit, disconnect the power at the main service disconnect switch and
place a red tag at the disconnect switch to indicate that work is being pe$ormed on the circuit.
WARNING:
Use extreme caution when performing tests on energized circuits.
WARNING:
The conveyor drive contains moving parts.
Use caution when working around the conveyor drive assembly.
5.3.1 Pressure
Reducing Valve (PRV) Adjustment
The PRV is located on the 3/4" incoming water supply before the
final rinse booster assembly. To adjust the pressure setting on the
PRV, loosen the locknut on the adjusting screw in the top of the
PRV. Turn the adjusting screw clockwise to increase the pressure
setting. Turn the screw counterclockwise to decrease the pressure
setting. The USN-72 dishwasher requires a flowing pressure of
20-22 PSI during the final rinse. With the dishwasher in normal
operation, place a dishrack in the machine. While final rinse
water is flowing, monitor the final rinse pressure gauge located at
the top of final rinse piping assembly. Adjust the PRV screw to
achieve a flowing pressure of 20-22 PSI.
I
The PRV does not contain any service replacement parts. If
adjustment will not provide the proper flowing pressure, then replace the PRV.
To
replace the PRV: Turn
main water supply to the dishwasher off. Place a rack in the dishwasher to activate the final rinse. This
will bleed any water pressure out of the line. Remove the PRV from the piping system. Reinstall using
pipe sealing compound. Turn the water supply on, test for leaks, and perform the adjustment described
above.
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