Gardner Denver ELECTRA-SCREW EBE DH-15 HP, Operating And Service Manual

13–8–609    Page 11

A means of draining condensate will need to be pro-
vided for.

CONTROL PIPING – Control piping is not necessary
since the Electra–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 (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 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 upper right hand corner
of the cooler, viewed from the oil cooler side. A hand op-
erated valve, (air service valve) must be installed be-
tween the unit and the customer’s air system. When
manifolding two or more Electra–Screw

 units on the

same line, each unit is isolated by the check valve in the
unit discharge line. If an Electra–Screw

 unit is man-

ifolded to another compressor, be sure the other com-
pressor has a check valve in the line between the ma-
chine and the manifold. If an Electra–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.

BLOWDOWN VALVE PIPING – The blowdown valve
is fitted with a muffler for operation indoors.  If the instal-
lation requires, the muffler may be removed and the
blowdown valve piped to the outside with a pipe size the
same as the blowdown valve outlet connection.

ELECTRICAL WIRING

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

Standard Units – The Electra–Screw

 compressor is

factory wired for all starter to motor and control connec-
tions for the voltage specified on the order. It is neces-
sary only to connect the unit starter to the correct power
supply. The standard unit is supplied with an open drip–
proof motor, a NEMA 12 starter and control enclosure.
See ”Location” paragraph, page 8, for distance to
nearest obstruction on starter and control box sides of
the unit.

The overload heaters are to be selected according to
starter manufacturer’s tables, which are attached to
the inside of the control box, based on motor nameplate
full load amperage.

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 con-
troller malfunction.

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-

INLET LINE LENGTHS

Length of Inlet Line

Diameter of Pipe Size

 0 to 10 Feet (0 to 3 Meters)

Same as Compressor Inlet Opening

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

10 to 17 Feet (3 to 5 Meters)

One Size Larger Than Inlet Opening

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

17 to 38 Feet (5 to 11.5 Meters)

Two Sizes Larger Than Inlet Opening

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .