Powerex SE Serie Mode D'emploi page 6

10HP - 20HP Scroll Enclosure Air Compressors
INSTALLATION Cont'd
Never install a shut-off valve between a compressor pump
and the tank without an appropriate safety valve. Personal
injury and/or equipment damage may occur. Never use
reducers in discharge piping.
When creating a permanently installed system to distribute
compressed air, find the total length of the system and select
pipe size from the chart. Bury underground lines below the
frost line and avoid pockets where condensation can gather
and freeze.
Apply air pressure to the piping installation and make sure all
joints are free from leaks BEFORE underground lines are
covered. Before putting the unit into service, find and repair
all leaks in the piping, fittings and connections.
Select the size of the air receiver so that the combined volume
of the air receiver and facility piping results in a long enough
cycle time to keep any individual motor from starting more
than once every 3.43 minutes. Selecting the widest possible
spread between high and low system set point pressure along
with the largest differential for each pump interval will
reduce the starting frequency.
The table below shows the recommended tank size in gallons
per model. Some conditions of air usage may require
additional volume.
Differential*
Min
Standard
Max
Chart 2
* Pressure setting selected on control panel
1. Make sure the piping is lined up without being strained or
twisted when assembling the piping for the scroll 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.
Pg 6
SED SET SEQ
80 120 200
60 80 120
30 60 80
REMOTE INTAKE PIPING
Powerex compressor systems with pipe thread connectors on
the intake filters are intended for installation with remote air
intake. Piping for the remote intake system should be
installed at the final operating site.
Under some conditions, the intake piping may facilitate the
condensation of humidity in the intake air stream into liquid
water.
THE INTAKE FILTERS SUPPLIED BY POWEREX WILL
NOT STOP INGESTION OF LIQUID WATER BY THE
PUMPS. LIQUID WATER GOING INTO THE PUMPS
WILL DAMAGE THE PUMPS AND VOID THE
WARRANTY.
liquid water in the intake piping before the air filters. Drip
legs must be sized with low enough air velocity to make sure
they are effective at capturing liquid water in the intake air
and must be maintained (drained) at frequent intervals to
make sure they remain effective.
SAFETY VALVES
Safety Valves must be installed on every receiver. The flow
capacity of a safety valve should be equal to or greater than
the capacity of the compressor.
1. The pressure setting of the safety valve must not be greater
than the maximum working pressure of the air receiver.
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.
CHECK VALVES
Do not install a check valve between the compressor and the
air receiver or facility piping. If a check valve is installed, the
compressor pressure sensor will see rapid pressure drops and
cause short cycling of the motors and other control problems.
ISOLATION VALVES
An isolation valve should be installed between the
compressor and an external air receiver to facilitate
maintenance and control air flow out of the unit. Make sure
the valve is open when operating the compressor. A second
isolation valve should be installed between the air receiver
and the facility piping.
TANK MOUNTING
Bolt an external air receiver on a flat, even, concrete floor or
on a separate concrete foundation. Use vibration isolators
between the tank leg and the floor. After placing unit on
vibration pads, do not draw bolts tight. Allow the pads to
absorb vibrations. Install a flexible hose or coupling between
the tank and service piping.
Always install drip legs with
sufficient capacity to capture