4: Operation 600H, 750, 750H, 750HH, 825, 900, 900H, 1050 T3 CAT User Manual
02250197-981 R01
52 Subject to EAR, ECCN EAR99 and related export control restrictions.
Control Regulating Valve
Provides an air signal to the inlet valve and engine to close the inlet
valve and reduce engine speed to control air delivery according to
demand.
Minimum Pressure/Check Valve
Maintains a minimum of 65 psig (4.5 bar) in the compressor receiver
tank. This valve restricts receiver air discharge from receiver/receiver
tank when pressure falls to 65 psig (4.5 bar). Also prevents back flow
into the receiver tank during upload conditions and after shutdown.
HI/LO Selector Switch
Select high pressure 150 psig (10.3 bar) or low pressure 100 psig
(6.9 bar) at instrument panel to correspond to operator’s needs.
Pressure Relief Valve
Opens receiver tank pressure to atmosphere should pressure inside the
receiver tank exceed the pressure relief valve setting.
Air Inlet Valve
Regulates the amount of air allowed to enter the air inlet. This regulation
is determined by the amount of air being used at the service line.
Blowdown Valve Vents receiver tank pressure to the atmosphere at shutdown.
Thermal Valve
Regulates flow of fluid to and around the fluid cooler. Designed to main-
tain a minimum operating temperature; used for fast warm-up at start-up
and to eliminate condensation during operation.
Running Blowdown Valve
Vents surplus receiver tank pressure to the atmosphere during opera-
tion.
Coolant Level Switch
Shuts the compressor down and/or prevents it from being started if the
engine coolant level drops too low.
Recirculation Valve
Provides limited air supply back to inlet valve during unload/no load con-
ditions to prevent cavitation in the unit.
Control or indicator Purpose
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