Section II - Description
Quincy Compressor
®
- QSB/T
™
9
Auto Demand (Optional)
Auto Demand controls accommodate external control
signals from an optional Quincy
Demand-A-Matic
®
multiple compressor controller.
With the selector switch in the Local mode, the
compressor will operate as described in the Auto Dual
description.
In the Remote mode, the compressor’s control panel is
bypassed in favor of the
Demand-A-Matic
®
multiple
compressor controller. The compressor will start, build
air, unload and shutdown on time delay as determined by
the
Demand-A-Matic
®
controller. With slight
modifications, a compressor equipped with Auto Dual
controls may be converted to Auto Demand control.
Contact your authorized Quincy Distributor.
Lead/Lag (Optional, two machines only)
This option allows one of two different pressure control
settings to be chosen for a given machine. If the demand
is greater than one unit’s capability, the second
compressor will automatically turn itself on until the
excess demand has been satisfied. Again, working with
the standard Auto Dual control, the second machine
would time out and turn itself off after the demand
dropped.
Load/No Load (Optional)
In the Load/No Load mode, the compressor does not
modulate the inlet valve. The valve is either fully open
or it is closed. If system demands include regular periods
of air usage at less than full load, a large compressed air
storage capability is required with this type of control.
Without adequate storage, rapid cycling may occur. This
will cause wide system pressure fluctuations that may
affect the performance of equipment using the
compressed air. Load/No Load works with Auto Dual
control to turn the compressor off during extended
periods of no demand.
Electronic Control (Optional)
The QSB/T
™
compressor with Electronic Control utilizes
a microprocessor to control the compressor. Refer to
Section IV for operational instructions.
WARNING!
Never assume it is safe to work on a compressor
because it is not operating. It may be in standby
mode and could restart at any time. Follow all
safety instructions in Section V - Maintenance or
Service Preparation.
Summary of Contents for QSB Series
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Page 72: ...Appendix A Dimensional Drawings 68 Quincy Compressor QSB T QSB 15 50 HP air cooled...
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