3
Oilless Reciprocating Air Compressor Pumps
Installation (Continued)
PIPING
Refer to the general safety guidelines manual.
1. Make sure the piping is lined up without being
strained or twisted when assembling the piping for the
compressor.
2. Appropriate expansion loops or bends should be installed
at the compressor to avoid stresses caused by changes in
hot and cold conditions.
3. Piping supports should be anchored separately from the
compressor to reduce noise and vibration.
4. Never use any piping smaller than the compressor
connection.
5. Use flexible hose to connect the outlet of the compressor
to the piping so that the vibration of the compressor
does not transfer to the piping. Make sure the flexible
hose is rated for proper pressure and temperature before
installing.
SAFETY VALVES
A safety valve must be installed in the manifold or tank
where the compressor pump is installed. The flow capacity of
the safety valve must be equal to or greater than the capacity
of the compressor.
1. The pressure setting of the safety valve must be no
higher than the maximum working pressure of the tank.
2. Safety valves should be placed ahead of any possible
blockage point in the system, i.e. shutoff valve.
3. Avoid connecting the safety valve with any tubing or
piping.
4. Manually operate the safety valve every six months to
avoid sticking or freezing.
5. The safety valve must be ASME approved.
HOURMETER
The hourmeter on the oilless compressor indicates the
actual number of hours the unit has been in operation. The
hourmeter is also used to determine maintenance and service
timing. An hourmeter must be installed with every
oilless compressor.
CONDENSATE DRAIN VALVE
A condensate drain valve must be installed on any tank
to allow removal of the liquid which will collect during
compressor operation.
Drain liquid from
tank daily.
Operation
Powerex oilless compressors operate at a standard pressure
of 120 PSIG. Two stage compressors operate at a maximum
of 145 PSIG and are equipped for continuous run operation.
Compressor RPM’s are established by Powerex based on
horsepower and operating pressure.
BEFORE START UP
1. Make sure all safety warnings, labels and instructions
have been read and understood before continuing.
2. Be sure all pressure connections are tight.
3. Check to be certain all safety relief valves, etc., are
correctly installed.
4. Make sure the inlet filter is properly installed.
5. Visually check the rotation of the compressor pump.
If the rotation is incorrect, have a qualified electrician
correct the motor wiring.
START-UP AND OPERATION
1. Follow all the procedures under “Before start-up” before
attempting operation of the compressor.
2. Switch the electric source breaker on.
3. Open the tank discharge valve completely.
4. Check that the compressor operates without excessive
vibration, unusual noises or leaks.
5. Close the discharge valve completely.
6. Check the discharge pressure. Also make sure the air
pressure rises to the designated pressure setting by
checking the discharge pressure gauge.
7. Check the operation of the pressure switch or the pilot
valve for continuous run units by opening the stop
valve and confirming the compressor starts or reloads as
pressure drops.
Switch the breaker off if the compressor is not to be used for
a long period of time.
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