Section VIII - Service Adjustments
44
Quincy Compressor-QSI
®
• Differential Pilot Valve
• Pressure Switch
• Water Temperature Regulating Valve
(Water-cooled units Only)
• Drive Coupling Alignment
Differential Pilot Valve
WARNING!
Never adjust the pressure higher than the factory
setting. Death or serious injury and compressor
or property damage could result.
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 (110 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 to the air cylinder on the inlet valve, causing
the valve to modulate toward its closed position, thereby
reducing the volume of air being compressed.
To raise the pressure, turn the adjusting screw in
(clockwise). To lower the pressure, turn the screw out
(counter clockwise). Maximum full load pressure is 110
PSIG for standard QSI units. Minimum full load pressure
with modulation and standard controls is 75 PSIG.
Pressure Switch
The pressure switch determines what pressure the
compressor will load and unload. Standard factory
settings are 110 PSIG cut-in, 125 cut-out. If a lower
setting is desired, adjust the differential pilot valve first
and set the pressure switch cut-out point to 15 PSIG over
the desired full load pressure. The range adjustment is
made by turning the screw clockwise to increase the cut-
in/cut out pressure.
Water Temperature Regulating Valve
(Water-cooled units Only)
The water temperature regulating valve senses fluid
temperature and opens or closes, regulating water flow
from the unit. It is factory set to maintain 180°F
discharge temperature. Due to different incoming water
temperatures and/or pressures at each location valve
adjustment should be checked during start-up to maintain
180°F discharge temperature. To increase fluid
temperature, decrease water flow by turning the
adjustment screw clockwise. To decrease fluid
temperature, increase water flow by turning the
adjustment screw counter clockwise.
Summary of Contents for QSI 1000
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Page 11: ...Section I General Quincy Compressor QSI 5 MODEL IDENTIFICATION ...
Page 25: ...Quincy Compressor QSI 19 THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 65: ...Quincy Compressor QSI 59 THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 66: ...Appendix A Dimensional Drawings 60 Quincy Compressor QSI QSI 220 245 air cooled ...
Page 67: ...Appendix A Dimensional Drawings Quincy Compressor QSI 61 QSI 220 245 water cooled ...
Page 68: ...Appendix A Dimensional Drawings 62 Quincy Compressor QSI QSI 250 300 air cooled ...
Page 69: ...Appendix A Dimensional Drawings Quincy Compressor QSI 63 QSI 250 300 water cooled ...
Page 70: ...Appendix A Dimensional Drawings 64 Quincy Compressor QSI QSI 335 370 air cooled ...
Page 71: ...Appendix A Dimensional Drawings Quincy Compressor QSI 65 QSI 335 370 water cooled ...
Page 72: ...Appendix A Dimensional Drawings 66 Quincy Compressor QSI QSI 440 500 air cooled ...
Page 73: ...Appendix A Dimensional Drawings Quincy Compressor QSI 67 QSI 440 500 water cooled ...
Page 74: ...Appendix A Dimensional Drawings 68 Quincy Compressor QSI QSI 540 600 air cooled ...
Page 75: ...Appendix A Dimensional Drawings Quincy Compressor QSI 69 QSI 540 600 water cooled ...
Page 76: ...Appendix A Dimensional Drawings 70 Quincy Compressor QSI QSI 675 750 air cooled ...
Page 77: ...Appendix A Dimensional Drawings Quincy Compressor QSI 71 QSI 675 750 water cooled ...
Page 78: ...Appendix A Dimensional Drawings 72 Quincy Compressor QSI QSI 925 1000 air cooled ...
Page 79: ...Appendix A Dimensional Drawings Quincy Compressor QSI 73 QSI 925 1000 water cooled ...
Page 80: ...Appendix A Dimensional Drawings 74 Quincy Compressor QSI QSI 1175 1250 1400 1500 air cooled ...
Page 81: ...Appendix A Dimensional Drawings Quincy Compressor QSI 75 QSI 1175 1250 1400 1500 water cooled ...
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