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Wiring
All electrical hook-ups must be performed by a qualified electrician.
Installations must be in accordance with local and national electrical
codes.
1. A service disconnect and fuses or a circuit breaker must be
installed to supply electric power to this compressor. Make
sure the circuit is sized to handle the full operating load as
shown in the table.
2. Remove the front panel and the electrical box cover to access
wiring area.
3. Connect the power cable to the power junction block located
on the side of all starter connections.
Consult your NEC and local codes for wire size.
Piping
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*
W7.5-D
Min
80
Standard
60
Max
30
*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 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 outlet
connection.
5. Flexible hose required between compressor and downstream
piping so that the vibration of the compressor does not transfer
to the piping.
RELEASED 01/Jul/2024 12:28:06 GMT
7.5-15 kW (10-20 HP) Scroll Enclosed Air Compressors
W11-T
W15-Q
120
200
80
120
60
80
Pressure Relief Valves
Pressure relief valves must be installed on every receiver. The flow
capacity of a pressure relief valve should be equal to or greater than
the capacity of the compressor.
1. The pressure setting of the pressure relief valve must be not
higher than the maximum working pressure of the tank.
2. Pressure relief valves should be placed ahead of any possible
blockage point in the system, i.e. shutoff valve.
3. Avoid connecting the pressure relief valve with any tubing or
piping.
4. Manually operate the pressure relief 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
the air receiver to facilitate maintenance. 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.
47672197001 • 04/17/24 • Rev. F
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