TM 5-3895-374-24-1
OPERATING INSTRUCTIONS
COMPRESSOR CONTROLS
Main Power Disconnect
Install a main disconnect In the power line to the
compressor, near the compressor’s location It Is
operated manually, but when It is in the ON position, the
compressor will start up or shut down automatically on
air demand. ALWAYS set this switch to OFF when the
compressor is not being used. See Fig 2 on page 6.
Magnetic Starter Reset Switch
If the motor shuts down because of overload, wait 10-
15minutes so the motor can cool down, then press
(NEVER force) the reset switch on the front of the
magnetic starter to restart the motor See Fig 2 on page
6.
Pressure Switch
WARNING: For your safety, tank pressure is preset
within the switch and must never be tampered with. This
switch must not be adjusted by the operator, doing so will
void the warranty. The pressure switch controls the level
of air pressure In the receiver by automatically shutting
down and restarting the motor, as required to maintain
the factory preset pressure level See Fig 5.
Pressure Relief Valve
If the pressure switch does not shut down the motor
when pressure reaches the preset level, this valve will
pop open automatically to prevent overpressurization. To
operate manually, pull the ring on the valve to relieve air
pressure in the receiver. Pull the ring daily to test See Fig
5.
Receiver Pressure Gauge
This gauge measures the pressure level of the air stored
in the receiver. It is not adjustable by the operator, and
does not indicate line pressure See Fig 5.
Centrifugal Unloader
The centrifugal unloader automatically bleeds pressure
from the compressor pump head when the compressor
shuts down. This feature eliminates back pressure in the
pump, ensuring easier starting See Fig 6.
Figure 5. Pressure relief Valve and Pressure Switch
Figure 6. Centrifugal Unloader
200-2009
(page 3-634)
