Section 4
375, 375H, 400HH, 425, 425H T4F User Manual 4: Operation
02250223-036 R01
Subject to EAR, ECCN EAR99 and related export control restrictions. 43
Operation
4.1 General
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 per-
formance, operators should learn to recognize indica-
tions which identify a service r
equirem
ent or conditions
that could lead to (or show) a (current) malfunction.
Before starting the compressor, read this section thor-
oughly to gain familiarity with the controls and indica-
tors—their function and location.
4.2 Purpose of controls
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.
Air pressure gauge
Continuously monitors the pressure inside the receiver tank.
Fluid level sight glass
Indicates the fluid level in the receiver tank. 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 the compressor
discharge shutdown temperature (see Section 3.1: Spec-
ifications—375, 375H, 400HH, 42
5 & 425H Ti
er 4 Final
Caterpillar on pa
ge 39).
Thermal valve
Functions as a temperature regulator by directing the com-
pressor fluid either to the cooler or to the compressor unit.
Minimum pressure device
Maintains the minimum of 80 psig (5.6 bar) in the com-
pressor receiver tank.
Pressure relief valve
Vents receiver tank pressure to the atmosphere if pres-
sure inside the receiver tank exceeds 200 psig (13.8 bar).
Air inlet valve
Controls the amount of air allowed to enter the air com-
pressor 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 for aftercooled and filtered models only)
Monitors the air filter (first and second stage) condition. A
reading over 10 psig (0.7 bar) in the red zone indicates
the air f
ilters require servicing.
Blowdown valve
Vents receiver tank pressure to the atmosphere at shutdown.
Idle warm-up control
Keeps the compressor inlet valve closed for reduced
compressor load at start-up. When the compressor is
warmed-up, the handle is turned from the START to the
RUN position for full operation.
NOTICE
Do not use the emergency stop button for nor-
mal shutdown in place of the shutdown proce-
dure in Section 4.4. Engine damage could occur.
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