12
minimum pressure of 60 to 70 psi in the air
receiver/oil reservoir regardless of service or
distribution piping pressure.
In addition, this valve checks the return flow of
air from the system receiver (storage tank
and/or distribution system) when the
compressor is stopped or running unloaded.
NOTE
COMPRESSOR SHOULD NOT BE
OPERATED AT A MINIMUM PRESSURE
FOR EXTENDED PERIODS. EXCESSIVE
OIL LOSS WILL RESULT.
SEPARATOR DRAIN LINE
The separator drain line is mounted on the air
receiver/oil reservoir cover. This tube extends
down into and touches the bottom of the
separator element.
The other end of the drain line is connected to
a low pressure port on the air end.
The drain line is equipped with a filter, a
check valve and a flow sight gage.
The filter prevents foreign matter from entering
the air end. The check valve allows free flow
of air/oil from the separator to the air end but
prevents reverse air/oil flow at shut down. The
sight gage may be used to assist with service
diagnosis.
BLOW DOWN (DUMP) VALVE
The air receiver/oil reservoir blow down or
dump valve is located on the air inlet valve.
This is a normally closed valve which is
opened by air pressure.
This valve is opened by air pressure from the
intake valve when he unit is shut down.
Blow down (dump) air flows to atmosphere
through the air cleaner.
RETURN AIR BLEED BACK VALVE
The return air bleed back valve is mounted on
the intake valve.
This normally closed valve is opened by
control pressure when the unit is running
unloaded.
When the unit is running unloaded (intake
valve closed) a small amount of air is allowed
to “bleed back” from the air receiver/oil
reservoir through the air end.
CONTROL PRESSURE REGULATOR
VALVE (Cub, Upper Range Modulation
Only)
The control pressure regulator valve is located
on the unit air intake valve.
The purpose of this valve is to furnish control
pressure to operate the intake valve for
modulating control.
This valve senses unit air receiver-oil reservoir
air pressures between 100 and 110 psi
(approximately) and opens or closes the
intake valve to control air delivery based on
demand.
The higher the unit receiver/reservoir air
pressure, the higher the control pressure and
the more the intake valve is closed (low
demand).
The lower the unit receiver/reservoir air
pressure, the lower the control pressure and
the more the intake valve is opened (high
demand).
When the unit air receiver/reservoir pressure
falls below 100 psi (approximately) the control
pressure regulator can no longer maintain
control pressure. This allows the intake valve
to fully open (fully load).
NOTE
THE CONTROL PRESSURE REGULATOR
VALVE, ON SOME UNITS, MAY BE
ADJUSTED TO OBTAIN A MAXIMUM OF
150 PSI FULL LOAD PRESSURE. THE
CONTROL OPERATION AS DESCRIBED
ABOVE WOULD THEN WORK BETWEEN
150-160 PSI (APPROXIMATELY).
CHECK THE SPECIFICATIONS FOR EACH
UNIT TO OBTAIN THE MAXIMUM
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