Gardner Denver EFD-25 HP Operating And Service Manual Download

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13--8--625

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OPTIONAL MOISTURE SEPARATOR/TRAP -- The
unit is equipped with a built--in aftercooler, a combina-
tion moisture separator and trap is furnished as an op-
tion to the unit. This should be piped into the system
down stream of the aftercooler.

CONTROL PIPING -- Control piping is not necessary
since the rotary screw unit is factory wired and piped for
the control system specified.

INLET LINE -- Where an inlet line is used between the
air filter and the compressor, it must be thoroughly
cleaned on the inside to prevent dirt or scale from en-
tering 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 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 in-
creased according to Inlet Line Length Chart below.

Accessibility for inlet air filter servicing must be consid-
ered when relocating the filters from the unit to a remote
location.

DISCHARGE SERVICE LINE -- The discharge service
line connection is made at the opposite end of the pack-
age when viewed from the control box end. A hand op-
erated valve, (air service valve) must be installed be-
tween the unit and the customer’s air system. If a fast
operating valve, such as a ball valve, is used, it must
be closed slowly to give the intake valve time to shut
and keep the discharge pressure from spiking.

When manifolding two or more rotary screw units on
the same line, each unit is isolated by the minimum
pressure check valve mounted on each compressor
package.

If a rotary screw unit is manifolded to another compres-
sor, be sure the other compressor has a check valve in
the line between the machine and the manifold.

If a rotary screw and a reciprocating compressor are
manifolded together, an air receiver must be located
between the two units.

Discharge air used for breathing will
cause severe injury or death.

Consult filtration specialists for addi-
tional filtration and treatment equip-
ment to meet health and safety stan-
dards.

ELECTRICAL WIRING -- All of the electrical connec-
tions and controls are factory wired for the voltage spe-
cified on the order. Verify that the available voltage
source matches that shown on the compressor pack-
age nameplate before installing the compressor pack-
age. It is necessary only to connect the package to the
supply and ground of the branch circuit. The connec-
tions to the compressor package are made with the
electrical controls box, accessible by opening the cover
of the box.

Electrical shock can cause injury or
death. Open main disconnect switch,
tag and lockout before working on
control box.

GROUNDING -- Equipment must be grounded in ac-
cordance with Section 250 of the National Electrical
Code.

Failure to properly ground the com-
pressor package could result in injury
or death. Install ground wiring in ac-
cordance with the National Electrical
Code and any applicable local codes.

MOTOR LUBRICATION -- Long time satisfactory op-
eration of an electric motor depends in large measure
on proper lubrication of the bearings. The following
charts show recommended grease qualities and re-
greasing intervals for ball bearing motors. For addition-
al information refer to the motor manufacturer’s