Quincy Compressor QR-25 Series Instruction Manual

Quincy Compressor QR-25 Series Instruction Manual Manual pdf 31 page image

QR-25 Series Quincy Compressor52201-107, December 2012 29 3501 Wismann Lane, Quincy IL - 62305-3116PILOT VALVE ADJUSTMENTSAll adjustments made to the pilot valve must be performed by a qualified technician. The adjustments mustbe 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 com-ponent must be performed by a qualified technician. Exceeding the factory recommended maximum pressurewill void the warranty and may cause personal injury.*Setting Unload Pressure*Step 1. Flip the toggle tothe “RUN” positionas shown, or turnthe knurled knob (ifso equipped) counterclockwise until itstops.Step 2. Loosen locknut (counterclockwise). * Sta-bilize with back-up wrench!Step 3. Turn clockwise to increase unload pressure, turn counterclockwise to decreaseunload pressure. Hold position withwrench and proceed to Step 4.Step 4. Tighten locknut (clockwise) with wrench.* Stabilize with back-up wrench!Setting Differential PressureStep 5. Loosen locknut (counterclockwise). * Stabilize with back-upwrench!Step 6. Turn clockwise to decreasethe differential pressure andcounterclockwise to increasethe differential pressure. Holdposition with wrench and proceed to Step 7.Step 7. Tighten locknut (clockwise)with wrench. * Stabilize withback-up wrench!“MANUALUNLOAD”position(Ref.)