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* 80
_
F (27
_
C) Inlet Air
Minimum Air Flow * For Compression
And Cooling – Cubic Feet/Minute
(Cubic Meters/Minute)
HP (KW)
Air Cooled
Water Cooled
40 & 50 HP
6,500
1,400
60–100 HP
12,500
1,700
(45–75 KW)
(354)
(48)
FIGURE 2–2 – AIR FLOW CHART
For aluminum oil coolers, do not use
any cleaning solution that is not com-
patible with aluminum. Use of improp-
er solution may result in damage to
the cooler.
Water–Cooled Units – The water–cooled unit with the
standard enclosure requires sufficient air flow,
FIGURE 2–2, for electric motor cooling. Air is drawn
into the unit at the top of the enclosure and is exhausted
at the motor side. Do not block air flow to and from unit.
Allow three and one–half (3–1/2) feet (1.1 M) to the
nearest obstruction on the starter end and control box
side of the unit. Allow three (3) feet (.9 M) to the nearest
obstruction above and on other sides of the unit.
FOUNDATION – The G–D Rotary Screw compressor
requires no special foundation, but should be mounted
on a smooth, solid surface. Whenever possible install
the unit near level. Temporary installation may be made
at a maximum 10
_
angle lengthwise or 10
_
sidewise.
Mounting bolts are not normally required. However,
installation conditions such as piping rigidity, angle of
tilt, or danger of shifting from outside vibration or mov-
ing vehicles may require the use of mounting bolts and
shims to provide uniform support for the base.
OIL RESERVOIR DRAIN – The oil drain is piped from
the bottom of the reservoir to the side of the frame. This
drain is approximately 4.50 inches (115 mm) above the
floor level. If this is not sufficient to conveniently drain
the oil some other methods of providing drain are:
1.
Elevate the compressor unit on a suitable struc-
ture to obtain the desired drain height.
If the compressor unit base is raised
above floor level, the space between
the floor and the base bottom must be
closed with solid material all around
to prevent recirculation of hot air from
the oil cooler end and over tempera-
ture operation.
2.
Construct an oil sump or trough below the floor
level and pump or bail the drained oil.
3.
Pump oil from the reservoir filler opening or drain
to a container.
ENCLOSURE – The compressor, electric motor, oil
cooler and aftercooler are mounted inside the enclo-
sure. Service doors are provided for maintenance ac-
cess. Be sure to allow enough space around the unit
for the doors to open completely. Any of the enclosure
doors may be removed by opening the door and lifting
it up slightly to disengage the hinges.
Do not operate the compressor with
the fan and coupling guard removed.
Exposed fan and belts may cause
injury to personnel.
The motor inspection/air filter service panel is held by
two latches and lifts away from the enclosure. The air
outlet panel is attached by screws to the enclosure and
is not readily removeable.
INSTALLATION FOR COLD WEATHER OPERA-
TION (FIGURE 2–3, page 10) – It is recommended
that the unit be installed inside a shelter that will be
heated to temperatures above freezing (32
_
F, 0
_
C).
This will eliminate many of the problems associated
with operating units in cold climates where freezing
rain, drifting snow, freezing condensate and bitter cold
temperatures are encountered.
Refer to Engineering Data Sheet 13–9–411 for the ad-
vantages of using the heat recovered from rotary com-
pressors. This heat recovery could easily pay for an ad-
equate shelter for the unit.
When an outside installation must be made, the pre-
cautions required will depend on the severity of the en-
vironment. The following are general guidelines for
outside installations:
