Gardner Denver ELECTRA-SAVER II Service Manual page 14

of 3 through 5 above
Water Cooled Machines (Figure 4-2) — On water-cooled
machines with aftercooler, the moisture separator and con
densate drain are shipped loose and must be installed by
customer. Customer must furnish and install all water
piping required
CONTROL PIPING –
Control piping is not necessary
since the Electra-Saver II unit is factory wired and piped
for the control system specified
INLET LINE — Where an inlet line is used between an
outside air filter and the compressor, or to connect the
unit mounted air filter to an outside source of air, it must
be thoroughly cleaned on the inside to prevent dirt or
scale from entering the compressor. If welded construc-
tion 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. The inlet line
should be the full size of the inlet opening on the com-
pressor. If an extra-long line is necessary, the pipe size
should be increased accordingly
Length Of Inlet Line Diameter Of Pipe Size
0 to 10 Ft . . . . . . . Same As Compressor Inlet Opening
10 to 17 Ft . . One Size Larger Than Inlet Opening
17 to 38 Ft . . . . . Two Sizes Larger Than Inlet Opening
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 on water-cooled units with aftercooler is
made at the moisture separator. On air-cooled units and
water-cooled without aftercooler, the connection is made at
the minimum pressure valve located behind the instrument
panel When manifolding two or more
Electra-Saver II
units
on the same Iine each unit is isolated by the check valve in
the unit discharge line If an
Electra-Saver II
unit is mani
folded to another compressor, be sure the other compres
sor has a check valve in the line between the machine and
the manifold If an
Electra-Saver II
and a reciprocating
compressor are manifolded together, an air receiver must
be located between the two units
DANGER
DO
NOT
USE THE AIR DISCHARGED FROM
THIS UNIT FOR BREA THING — IT IS NOT
SUITABLE FOR HUMAN CONSUMPTION.
BLOWDOWN VALVE PIPING — The biowdown valve
is fitted with a muffler, for operation indoors If the in
stallation requires the muffler may be removed and the
biowdown valve piped to the outside with pipe the same
size as the blowdown valve outlet connection
WATER PIPING (Watercooled Heat Exchanger Models
Onlyj – On machines equipped with a water-cooled heat
exchanger, pipe water to the inlet or water flow control
valve mounted in the water inlet piping to the heat ex-
changer. Pipe outlet water from the outlet or magnetic
water shutoff valve to a sump or drain The thermal bulb
is inserted in the heat exchanger oil outlet line refer to
the unit outline drawing for location
The water source should be capable of supplying up to
the maximum flow shown in Figure 5-2 at a minimum pres
sure of 40 PSIG maximum allowable water pressure is
150 PSIG The water flow rates shown in Figure 5-2 are
approximate and a guide to sizing piping cooling tower
and other water system equipment
The heat exchanger is designed to operate with water inlet
temperatures from 60° F. to 90° F., and a water outlet
temperature not to exceed 110° F. If water cooler than
60° F. is used high water outlet temperatures (overl 10° F.)
will be experienced along with shortened heat exchanger
life caused by tube fouling and corrosion If water warmer
than 90° F. is used higher compressor oil temperatures
and high water usage will result
Most water systems will require control of impurities
filtration, softening or other treatment See "Compressor
Oil Cooler — Water-Cooled Heat Exchanger" for more
information on the water system.
Aftercooler — Heat Exchanger Water Piping (Figure4-2)
— If an aftercooler is used and piped in series with the
heat exchanger, install the water flow control valve and
magnetic water shutoff valve, if used downstream of the
exchanger. PiPe the aftercooler water outlet to the heat
exchanger water inlet on the compressor unit
If the aftercooler is piped in parallel with the heat ex-
changer, provide a manual valve between the aftercooler
outlet and the heat exchanger outlet after the water control
valve to adjust aftercooler water flow for discharge temper-
ature required and most economical water use separate
water inlet lines are piped to the aftercooler and heat
exchanger.
~CAUTION
When an ajtercooler is piped in series with the oil
cooler the maximum allowable waterflow rate through
the oil/aftercooler system is the maximum allowed
by the aftercooler. If the oil cooler requires more
water flow than the maximum allowed by the after-
cooler a parallel water piping system must be used
If the standard factory built-in aftercooler is used the
maximum allowable water flow through the aftercooler is
30 gallons per minute and the maximum water inlet pres
sure is 150 PSIG. If another aftercooler is used consult the
manufacturer for operating limits
The water control valve MUST be used to maintain dis
charge temperatures approximately 10 F* over the dew
point for expected ambient (Figure 8-5). See Section 5 for
adjustment instructions and maximum allowable oil tent
perature
ELECTRICAL WIRING — The
Electra-Saver II
unit is
furnished with the compressor motor enclosure as spec
ified by the user. If the unit has an air-cooled oil cooler,
this fan motor is a totally enclosed "air-over" or fan-cooled
type and is complete with starter and enclosure as spec
ified by the user. Allow 42" deep by 30" wide clear space
to nearest obstruction over control enclosure in accord
ante with Article 110-16 (a) National Electrical Code
it is necessary to connect the compressor unit (and oil
cooler, if used) to a main starter of the correct size power
characteristics and enclosure for the application
See
13-9-630
Section 2
Page 5