Figure 2-4 - Inlet Line Lengths - Gardner Denver AUTO SENTRY EAU99P Operating And Service Manual

1. It will be necessary to provide shutters or to block off part of the cooler in some manner since the
cooler is greatly oversized for operation in these low temperatures. Since shutters are not provided
as a factory option, blocking off a portion of the cooler with plywood should be satisfactory.
2. Auto operation should not be used in extreme environments.
3. Some means of providing heat during shutdown should be provided. There are various methods to
accomplish this, but since openings are not provided for sump heaters, the use of radiant heaters is
recommended. The heaters should be sized to provide at least a +10° F (-12° C) environment for
coolers, motor and sump. Figure 2-3, page 16, shows how these might be located in a typical
installation and sizes required.
Remember unsheltered (outside) installations should be avoided where 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. When used, an air receiver should be of
adequate size, provided with a relief valve of proper setting, a pressure gauge and a means of draining
condensate.
MOISTURE SEPARATOR/TRAP - Since the unit is equipped with a built-in aftercooler, a combination
moisture separator and trap is furnished with the unit. A means of draining condensate will be needed.
CONTROL PIPING - Control piping is not necessary since the Electra-Saver unit is factory wired and
piped for the control system specified.
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 2-4 – INLET LINE LENGTHS
13-10-615 Page 17