600H, 750, 750H, 750HH, 825, 900 & 900H USER MANUAL SECTION 2
24
2.5 CAPACITY CONTROL
SYSTEM, FUNCTIONAL
DESCRIPTION
The purpose of the control system is to regulate the
amount of air intake in accordance with the amount
of compressed air demand. The control system
consists of an inlet valve, the high and low pressure
regulators, the pressure reducing regulator, the
blowdown valve, the Speed Controller, a START/
RUN selector valve, and the HIGH/LOW selector
valve.
START - 0 TO 65 PSIG (0 TO 4.5 BAR)
Push OFF/ON switch to “ON” position to initialize the
Controller. Ensure the START/RUN valve is in the
“START” position and start the engine using the
START/STOP switch. In the “START” position, the
inlet valve is held closed by the springs in the inlet
valve. The valve is cracked open by vacuum in the
compressor and is allowed to build up to 65 psig (4.5
bar). The reason for keeping the valve closed during
start is to allow the engine and compressor fluid to
warm up without being loaded by the compressor. Air
pressure is contained in the receiver tank by the
minimum pressure valve which has a set point of 65
psig (4.5 bar). At this point the valve opens allowing
the air to pass to the service valve. After engine has
warmed up the START/RUN valve should be moved
to the “RUN” position.
Fluid
SU_0000144
3. RECEIVER TANK
4. FLUID COOLER
5. THERMAL VALVE
6. FLUID FILTER
Figure 2-3: Compressor Oil, Cooling and Lubrication - All Models
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