Gardner Denver ELECTRA-SAVER EAU PD - 200 HP, Руководство по эксплуатации и обслуживанию

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13–10–612 Page 14
mum pressure of 40 PSIG; maximum allowable water
pressure is 150 PSIG. The water flow rates shown in
FIGURE 2–7, Page 13, 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
(over 110
_
F.) will be experienced along with shortened
heat exchanger life caused by tube fouling and corro-
sion. If water warmer than 90
_
F. is used, higher com-
pressor oil temperatures and high water usage will re-
sult.
Most water systems will require control of impurities:
filtration, softening, or other treatment. See ”Compres-
sor Oil Cooler – Water–Cooled Heat Exchanger” for
more information on the water system.
Aftercooler – Heat Exchanger Water Piping
(FIGURE
2–4, Page 11, and FIGURE 2–7 and
FIGURE 2–8, Page 13, ) – If an aftercooler is used and
piped in series with the heat exchanger, install the wa-
ter flow control valve and magnetic water shutoff valve,
if used, downstream of the exchanger. Pipe the after-
cooler 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 after-
cooler outlet and heat exchanger outlet after the water
control valve to adjust aftercooler water flow for dis-
charge temperature required and most economical wa-
ter use; separate water inlet lines are piped to the after-
cooler and heat exchanger.
If the standard factory built–in aftercooler is used, the
maximum allowable water flow through the aftercooler
is 37 gallons per minute on 200 and 250 HP units, 50
gallons per minute on 300 HP units and the maximum
water inlet pressure is 150 PSIG. If another aftercooler
is used, consult the manufacturer for operating limits.
When an aftercooler is piped in series
with the oil cooler, the maximum al-
lowable water flow rate through the
oil/aftercooler system is the maxi-
mum allowed by the aftercooler. If the
oil cooler requires more water flow
than the maximum allowed by the af-
tercooler, a parallel water piping sys-
tem must be used.
The water control valve MUST be used to maintain dis-
charge temperatures approximately 10
_
F. over the
dew point for expected ambient (FIGURE 5–8, page
41). See Section 5 for adjustment instructions and
maximum allowable oil temperature.
ELECTRICAL WIRING – The Electra–Saver
R
unit is
furnished with the compressor motor enclosure as
specified 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 en-
closure as specified by the user. Allow 42” deep by 30”
wide clear space to the nearest obstruction over control
enclosure in accordance with Article 110–16(a), Na-
tional Electric 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 applica-
tion. See Section 4 for typical wiring diagrams; howev-
er, use only the wiring diagrams supplied with the unit
for final connections.
Starter – The main starter is to be mounted at a loca-
tion selected by the user at the time of installation. The
first three feet of line from the motor conduit box to the
starter must be of flexible conduit to maintain effective
vibration isolation. Electrical connections to other parts
of the unit (instrument panel, fan motor, etc.) from the
starter do not require flexible conduit since the com-
pressor and motor are already isolated from these
parts. See Table 110–16(a) National Electrical Code for
correct working clearance.
Electrical shock can cause injury or
death. Open main disconnect switch,
tag and lockout before working on
starter/control box.
GROUNDING – Equipment must be grounded in ac-
cordance with Table 250–95 of the National Electric
Code.
Failure to properly ground the com-
pressor package could result in con-
troller malfunction.