Section Vi- Service Adjustments; Differential Pilot Valve; Water Temperature Regulating Valve - Quincy QSF Series Instruction Manual

Section VI– Service Adjustments
Never adjust the pressure higher than the factory setting. Death, serious
injury and compressor or property damage may result.

Differential Pilot Valve

Open a manual vent valve to allow the compressor to exhaust air to the outside and start the unit. By
manual regulation, slowly close the valve, allowing the unit to build air pressure to the desired
modulation point and hold. (100 PSIG standard). Adjust the screw on the bottom of the differential pilot
valve so that a slight stream of air can be felt coming from the orifice adjacent to the adjustment screw.
When this air is felt, air is beginning to pass through the pilot valve, causing the valve to modulate
toward its closed position, thereby reducing the volume of air being compressed.
To raise pressure, turn the adjusting screw in (clockwise), to lower pressure turn screw out (counter
clockwise). Maximum full load pressure is 100 PSIG for standard QSF units. Minimum full load pressure
with modulation and standard controls is 75 PSIG.
Water Regulating Valve (water-cooled units only)
The water-regulating valve senses fluid temperature and opens or closes, regulating water flow from the
unit. It is factory set to maintain 180
temperatures and/or pressures at the customer's location, valve adjustment should be checked during
start-up to maintain 180
by turning the adjustment screw clockwise. To decrease fluid temperature, increase water flow by
turning the adjustment screw counter clockwise. Water pressure should be 40-PSI minimum/100 PSI
maximum. Water temperature should be 50°F minimum/90°F maximum.
36
! WARNING !
0
F air discharge temperature. Due to different incoming water
o
F discharge temperature. To increase fluid temperature, decrease water flow
Quincy Compressor – QSF Series