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375 John Deere Standard and Aftercooled/Filtered Operator’s Manual and Parts List
Section 4
GENERAL
GENERAL4.1
While Sullair has built into this compressor a complete set
of controls and indicators that allow the operator to control
and monitor the compressor’s operation and performance.
Operators should learn to recognize indications which
identify a service requirement or conditions that could lead
to (or show) a (current) malfunction. Before starting the
compressor, read this section thoroughly to gain familiarity
with the controls and indicators – their function and
location.
PURPOSE OF CONTROLS4.2
Control or Indicator Purpose
Engine Switch
Press this switch to the ON (ignition) position to energize
the electrical system of the compressor. Press the switch
to the START position to momentarily engage the starter
and start the compressor. Press the switch to the OFF
position to shut the compressor down. This switch is
located on the instrument panel.
Emergency Stop Switch
Press in case of emergency when immediate shutdown is
required.
Pressure Transducer
Monitors the system control pressure.
Speed Module
Monitors the pressure transducer output and determines
the appropriate speed signal for the engine.
Air Pressure Gauge
Continuously monitors the pressure inside the receiver
sump at various load and unload conditions.
Fluid Sight Level Glass
Indicates the uid level in the sump. Proper level is marked
halfway up the sight glass. Check the level when the
compressor is shutdown and on level ground.
Compressor Discharge Temperature Switch
Opens the electrical circuit to shut down the compressor
when the discharge temperature reaches a specic value
(See Specifications on page 57 and on page 58).
Thermal Valve
Functions as a temperature regulator by directing the
compressor uid either to the cooler or to the compressor
unit.
Minimum Pressure Device
Maintains the minimum of 80 psig (5.6 bar) in the
compressor sump.
Pressure Relief Valve
Vents sump pressure to the atmosphere if pressure inside
the sump exceeds 250 psig (17.3 bar).
Air Inlet Valve
Regulates the amount of air allowed to enter the air
compressor inlet. Regulation is determined by a signal
from the pressure regulator(s).
Pressure Regulator(s)
Allows the pressure signal to reach the engine speed
transducer and the air inlet valve to control air delivery
according to demand.
Discharge Air Filter Differential Pressure Gauge
(Optional Aftercooled and Filtered Models Only)
Monitors the air lter (rst and second stage) condition. A
reading over 10 psig (0.7 bar) in the red zone indicates the
air lters require servicing.
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