Control System, Functional Description - Sullair 185 Operators Manual And Parts Lists

2.6 CAPACITY CONTROL SYSTEM, FUNCTIONAL
DESCRIPTION
R e f e r t o F i g u r e s 2 --- 3
pose of the control system is to regulate the amount
of air intake in accordance with the amount of com-
pressed air being used. The control system con-
sists of a pressure regulating valve(s), air inlet
valve, system blowdown valve, and hoses con-
necting the various components to the compres-
sor and engine governor. The functional descrip-
tions of the control system are given in four distinct
phases of operation. It applies to any control system
with the exception of those with stated pressures
which are dependent on pressure requirements.
The pressures stated will be in accordance with a
compressor having an operating pressure range of
100 to 110 psig (6.9 to 7.6bar).
Figure 2 ---3 Compressor Discharge System
a n d 2 --- 4 o r 2 --- 4 A . T h e p u r -
DESCRIPTION
START --- 0 TO 40 PSIG (0 to 2.8 BAR)
COLD START
When the compressor is started, the sump pressure
will quickly rise from 0 to 40 psig (0 to 2.8 bar). Dur-
ing this period the pressure regulator valve is inac-
tive. At this pressure range the idle warm---up valve
maintains a closed inlet valve for engine idle opera-
tion. After sufficient machine warm---up is achieved,
push the idle warm---up valve button on the instru-
ment panel. The inlet valve is fully open due to inlet
air pressure, and the compressor operates at full ca-
pacity operation. As the compressor operates at full
capacity, the engine runs at full speed.
NORMAL OPERATION --- 55 TO 100 PSIG (3.8 TO
6.9 BAR) OR 55 TO 150 PSIG (3.8 TO 10.3 BAR)
FOR "H" MACHINES
When the sump pressure rises above 55 psig (3.8
bar), the minimum pressure valve opens and deliv-
ers compressed air to the service line. At this time,
Section 2
11