GENERAL AIR PRODUCTS, INC.
For Assistance Please Call 1-800 345-8207
Please keep these instructions for future reference.
OILLESSINST
REV 080906
diameter to minimize pressure drop from the
compressor to system. Larger pipe size may be
required by code and may be substituted with no
adverse effects. Smaller line size must not be used
and will restrict the compressor flow, lowering
capacity and causing the compressor/motor to work
harder, which shortens compressor/motor life. All
piping connected to the compressor must be fully
supported and not transfer any loads to the
compressor.
If an AMD-1 is used, allow sufficient distance
between the compressor and AMD-1 to ensure that the
maximum temperature at the AMD-1 is 200
o
F or less.
When an AMD is used with riser mounted units, a
riser mounted tank kit (p/n OLR-TK) should be
installed to prevent short cycling the compressor.
All oil-less compressors include a relief valve. For
riser mounted models, the relief valve is installed on
the compressor outlet. For tank mounted models, an
ASME Code relief valve is mounted on the
compressor’s tank. This valve will open at a preset
value above the pressure switch setting to prevent
excess tank pressure in the event of switch failure.
WARNING:
Do not attempt to change the
safety relief valve setting
.
A manual drain is provided on the bottom of each tank
mounted compressor. Moisture accumulated in the
tank, must be drained weekly. An automatic drain ,
P/N DVA -2T, is recommended in areas of high
humidity.
The compressor outlet piping should contain an
accessible drain. As a minimum a manual drain may
be used, but an automatic drain is recommended to
remove excess water.
NOTE:
Accumulation of condensed water in a
system causes corrosion of components and
reduces system capacity.
NOTICE:
Warranty is void if a separate check
valve is not installed to prevent water back flow.
Wiring (reference “Wiring Instructions”
drawings)
WARNING
Have a qualified electrician wire the compressor
to ensure that the supply line has the same
characteristics (voltage, frequency and phasing)
as the motor. Wiring must comply with all local
and national codes.
CAUTION
Inadequate wiring size can cause insufficient
voltage at the compressor during start -up.
Overheating and damage to the motor and
controls may result
The supply wire must be of adequate size and no other
equipment should be connected to the same line. The
table below lists the recommended wire size for each
model, based on a 100’ run. Consult factory for
longer runs.
MINIMUM RECOMMENDED WIRE SIZE
MODEL
1 PHASE
3 PHASE
OL11016**
12
N/A
OL21533**
10
N/A
OL33550**
8
12
OL42575**
8
12
OL435V75**
8
12
OL525100**
8
12
OL610V100**
8
12
OL675150**
6
12
OL900V100**
8
12
OL900V150**
8
12
OL1200V200**
10
10
The motors supplied are multiple voltage motors. A
label on the pressure switch cover indicates the voltage
the motor is pre-wired for. If the supply voltage, on
site, is different from the voltage indicated on this
label, change the internal motor voltage connections to
match the supply voltage. To change internal voltage
connections, remove the cover plate located on the
rear or side of the motor and reconnect the wire leads
as shown on the motor’s wiring diagram.
On all three phase and ½ Hp and ¾ Hp single phase
models, an arrow on the motor indicates the direction
of rotation of the compressor. If the compressor
rotates in the opposite direction, reverse the rotation of
the motor. On single phase units, reverse motor
rotation by interchanging the red and black motor
leads. Interchanging any two incoming supply wires
reverses rotation of three phase motors.
NOTICE:
Single-phase oil-less
compressors can not be operated at 208V.
Operating the compressor at 208V voids the
warranty.
NOTICE
:
Single-phase motors include
internal thermal overload protection, which has
an automatic reset device.
WARNING:
Disconnect electrical power
before servicing to disable reset devices.
Thermal protection can automatically start the
motor when the protector resets.
On single phase models, the motor is pre-wired to the
pressure switch provided, which controls starting (cut
