AIR N ARC
®
150 SERIES
SECTION 5: MAINTENANCE
090043-OP_r0
(MARCH - 2015)
PAGE - 35
VANAIR MANUFACTURING, INC.
(800) 526-8817 • www.vanair.com
5.5.1 ADJUSTING COMPRESSOR CUT-IN /
CUT-OUT PRESSURE
The
Cut-in pressure
is defined as the
pressure in which the compressor starts
pumping. Anytime the pressure in the tank
falls below this pressure the compressor is
allowed to start pumping.
The
Cut-out pressure
is defined as the
pressure in which the compressor stops
pumping. When the pressure in the air tank
rises above this pressure the compressor is
signaled to stop pumping.
Pressure settings for both the minimum and
maximum rated pressure levels for this
machine are adjusted at the factory before
shipping, and should not need to be
adjusted. However, a situation may occur
where it is necessary to manually adjust or
reset either or both of these settings. For
such cases, consult the following procedure.
Refer to
Figure 5-1
.
Locate the pilot valve on
the base frame, near the compressor unit,
and use the following procedure to make
adjustments.
1. With a marker or scoring object,
make a corresponding mark [
F
] on
the pressure adjustment screw [
B
],
pressure differential adjustment
nut [
D
], and the valve body [
E
] for
referential purposes.
2. With the machine off, loosen the
locknut [
C
], and adjust the
pressure adjustment nut clockwise
(in) to raise the cut-in/cut-out
pressure, and counter-clockwise
(out) to lower the cut-in/cut-out
pressure. Using the reference
mark made in Step #1, adjust the
pressure adjustment nut by a 1/4 -
1/2 turn interval, and tighten the
locknut.
3. Start the engine and check the air
pressure gauge reading after the
engine has returned to idle
speed.
4. Repeat Steps #2 and #3 if further
adjustment is needed.
WARNING
Relieve pressure from the compressor
system before performing maintenance on
any components.
NOTE
DO NOT adjust the factory set pressure
differential adjustment nut. Reference the
mark made on the pressure variation
adjustment nut, and the valve body to
insure that it has not changed position.
KEY
DESCRIPTION
A
PILOT VALVE SWITCH
B
CUT-IN/CUT-OUT PRESSURE ADJUSTMENT
SCREW
C
LOCKNUT
D
PRESSURE DIFFERENTIAL NUT
E
VALVE BODY
F
Marking the reference line
Figure 5-1: Pilot Valve
A
B
C
D
E
F
