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Do not operate the compressors with the fan or coupling guard removed.
Exposed fan and couplings may cause personal injury.
INSTALLATION FOR COLD WEATHER OPERATION - It is recommended that the unit be installed
inside a shelter that will be heated to temperatures above freezing (40° F, 5° 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.
Unsheltered (outside) installations should be avoided whenever possible. Installation next to a heated
building where enough heat can be used to keep the compressor room above freezing will save many
complications in the operation and installation of the unit.
Refer to Engineering Data Sheet 13-9-411, available from an authorized Gardner Denver distributor, for
the advantages of using the heat recovered from rotary compressors. This heat recovery could easily
pay for an adequate shelter for the unit.
AUXILIARY AIR RECEIVER - An auxiliary air receiver is not required if the piping system is large and
provides sufficient storage capacity to prevent rapid cycling. An adequate receiver capacity for the VST
units is 1/2 gallon for each cfm delivered by the compressor package.
MOISTURE SEPARATOR/TRAP - Since the unit is equipped with a built-in aftercooler, a combination
moisture separator and drain valve are furnished with the unit.
CONTROL PIPING - Control piping is not necessary since the Gardner Denver compressor package is
factory wired and piped for the control system specified.
INLET LINE - Where an inlet line is used between the air filters and the compressor, it must be thoroughly
cleaned on the inside to prevent dirt or scale from entering the compressor. If welded construction is
used, the line must be shot blasted and cleaned to remove welding scale. In either case, the inlet line
must be coated internally by galvanizing or painting with a moisture and oil-proof sealing lacquer. Up to
ten (10) feet (3 meters) in length, the inlet line should be the full size of the inlet opening on the
compressor. If an extra-long line is necessary, the pipe size should be increased according to Inlet Line
Length Chart Figure 2-2
Accessibility for inlet air filter servicing must be considered when relocating the filters from the unit to a
remote location.
Length of Inlet Line
0 to 10 Feet (0 to 3 Meters)
10 to 17 Feet (3 to 5 Meters)
17 to 38 Feet (5 to 11.5 Meters)
Diameter of Pipe Size
Same as Compressor Inlet Opening
One Size Larger Than Inlet Opening
Two Sizes Larger Than Inlet Opening
Figure 2-2 – INLET LINE LENGTHS
13-17-605
Page 17
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