Scroll Enclosure Air Compressor 15-60 HP
Operating & Maintenance Manual
Powerex • 150 Production Drive • Harrison, OH 45030 • USA
P 1.888.769.7979 • F 513.367.3125 • www.powerexinc.com
IN596202AV • 21 February 2023
Page 6 of 32
The Powerex Scroll Enclosure Air Compressor is completely
factory wired and requires only a 3 phase supply circuit. A set of
terminals is provided for connecon of the supply conductors and
ground conductor.
A 2-inch opening is provided for conduit or cord connecon.
Wiring must be installed in accordance with Naonal Electric
Code and local codes and standards that have been set up covering
electrical apparatus and wiring. Consult the codes and standards
and observe local ordinances. Be certain that adequate wire sizes
are used, and that:
1. Service is of adequate ampere rang.
2. The supply line has the same electrical characteriscs
(voltage cycles and phase) as the motor.
3. Ensure the line wire is the proper size and that no other
equipment is operated from the same line.
Grounding
This product must be grounded. Grounding reduces the risk
of electrical shock by providing an escape wire for the electrical
current if short circuit occurs.
All electrical hook-ups must be performed by a qualied
electrician. Installaons must be in accordance with local and
naonal electrical codes.
Improperly grounded electrical
components are shock hazards. Make sure all the
components are properly grounded to prevent dealth
or serious injury.
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 on the unit wiring diagram or rating decal.
For some models supplied by Powerex as part of an
NFPA99 Medical Air System, a service disconnect
is incorporated into the front instrument panel.
This disconnect does not provide circuit overload
or short circuit protection.
2. On SED – SET models, access the electric panel
and wiring area by removing the right side panel.
On SEQ, SEP, and SEH models the electric panel
and wiring area is behind the front center panel.
Models that are part of Medical Air Systems have
an additional access cover on the roof panel over
the instrument area.
3. Using appropriate strain relief and cable
management techniques, connect the power
cable to the power junction block and the ground
wire to the ground bar. Consult your NEC and
local codes for wire size.
General Fault Dry Contact Connections
1. Turn the compressor o and lockout the power to
the compressor per OSHA standards.
2. Remove the front door panel for SEQ-SEH units,
and the right panel for SED-SET units, from the
scroll cabinet to access the operating panel.
3. Output wires should be connected between
terminals 10 and 11. The dry contacts are normally
closed; when there is a fault or loss of power to
the system, the contacts open. The contact rating
is as follows: 240VAC/2A or 30VDC/2A, maximum.
4. For larger load devices such as a horn or
emergency light, a relay should be used.
5. The signal wires should be 16 or 18 AWG.
6. Replace the door panel to the scroll compressor
cabinet.
Never use plastic (PVC) pipe for
compressed air. Serious injury or death could result.
7. Return the power to the compressor system.
Piping
Any tube, pipe or hose connected to the unit must
be able to withstand the temperature generated and
retain the pressure. All pressurized components of the
air system must have a pressure
Never install a shut-o valve
between a compressor pump and the tank without
an appropriate safety valve. Personal injusry and/or
equipment damage may occur. Never use reducers in
discharge piping.
rating higher than or equal to the ASME safety valve
setting. Incorrect selection and installation of any tube,
pipe or hose could result in bursting and injury.
The Powerex Scroll Enclosure Air Compressor has
an ASME safety relief valve at the outlet pipe nipple
connection point. 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
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