Installation Guide

QT & PLT Series Quincy Compressor

50161-106, January 2009 33 3501 Wismann Lane, Quincy Ill. - 62305-3116

PILOT VALVE ADJUSTMENTSPILOT VALVE ADJUSTMENTS

PILOT VALVE ADJUSTMENTS

All adjustments made to the pilot valve must be performed by a qualified technician. The adjustments must

be made while the unit is operating, therefore, extreme caution must be taken while working on the unit.

Observe all necessary precautions. Always use a back-up wrench and make all differential and unload pressure

adjustments in very small increments (1/8 turn).

WARNING !

The pressure switch and / or pilot valve are set at the factory for maximum efficiency. Adjustments to either

component must be performed by a qualified technician. Exceeding the factory recommended maximum pressure

will void the warranty and may cause personal injury.

Setting Unload Pressure

Step 1. Flip the toggle to the

"RUN" position as

shown, or turn the

knurled knob (if so

equipped) counter-

clockwise until it

stops.

Step 2. Loosen locknut

(counterclockwise). *

Stabilize with

back-up wrench!

Step 3. Turn clockwise to increase unload pres-

sure, turn counterclockwise to decrease

unload pressure. Hold position with

wrench and proceed to Step 4.

Step 4. Tighten locknut (clockwise) with wrench.

* Stabilize with back-up wrench!

Setting Differential Pressure

Step 5. Loosen locknut (counterclock-

wise). * Stabilize with back-up

wrench!

Step 6. Turn clockwise to decrease the

differential pressure and coun-

terclockwise to increase the dif-

ferential pressure. Hold posi-

tion with wrench and proceed

to Step 7.

Step 7. Tighten locknut (clockwise)

with wrench. * Stabilize with

back-up wrench!

"MANUAL

UNLOAD"

position

(Ref.)