Gardner Denver ELECTRA-SAVER EAY, Руководство по эксплуатации и обслуживанию

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13–10–613 Page 36
ter side) of the heat exchanger to remove deposits
which enhance fouling and corrosion.
Hex head zinc anodes are used in the return bonnet
(opposite end to the water pipe connections) of heat ex-
changers to provide internal water system corrosion
protection. These anodes should be inspected periodi-
cally and replaced when the zinc has been reduced to
about 1/2 inch in length.
WATER FLOW CONTROL VALVE FOR HEAT EX-
CHANGER (Optional Equipment) (FIGURE 5–7,
page 35) – The water flow control valve is adjustable to
compensate for varying water inlet temperatures and
pressures (thermal control valve prevents settings be-
low approximate 180
_
F.) Use the discharge air tem-
perature gauge on the instrument panel in setting flow
control valve for minimum water usage to maintain dis-
charge temperature at a minimum of 10
_
F above dew
point at the maximum anticipated ambient; refer to
FIGURE 5–8, page 35, for the dew point temperature
at the operating pressure and ambient temperatures.
To decrease water flow (increase compressor dis-
charge air temperature) turn the adjusting screw from
left to right, increasing spring tension. To increase wa-
ter flow (decrease compressor discharge air tempera-
ture) turn the adjusting screw in the opposite direction.
The groove at the lower edge of the adjusting screw is
an index line for use with the index scale 0 to 8 in obtain-
ing a desired setting.
These valves must be handled with care and proper
tools and techniques must be used when working on
the valve.
Care must be used when handling the capillary tube; a
kink or break in the tubing or connections will make the
valve inoperative. Never attempt to change capillary
length. Excess capillary tube should be carefully coiled
and placed so that damage will not occur in normal
maintenance or traffic past the unit.
If a leak develops through the packing, tighten the
packing gland nut firmly with a wrench to reseat the
packing around the valve stem, then back off the nut
until loose, and finally retighten the nut finger tight.
Tightening the packing nut too tight may cause erratic
operation. An occasional drop of oil on the valve stem
at the packing nut will prolong packing life.
If valve malfunctions, check for bent or binding, paint
or corrosion on valve stem, foreign material in valve,
erosion, or thermal system (capillary) failure. If foreign
material or scale is likely, the use of a strainer in the in-
let water line is recommended.
WATER SHUTOFF VALVE – WATER–COOLED
HEAT EXCHANGER (Optional Equipment)
(FIGURE 5–1, page 28) – A magnetic solenoid–oper-
FIGURE 5–9 – SINGLE ELEMENT OIL SEPARATOR
ated water shutoff valve rated at 150 psig water pres-
sure should be mounted in the water outlet line after the
oil cooler. The valve should be wired into the compres-
sor control circuit in such a manner that the valve opens
to allow water to flow any time the ON–OFF push but-
ton is ON and the compressor is running. When the
compressor stops under automatic control, or is shut
off manually, the valve should close, stopping water
flow through the system.
OIL RESERVOIR – The oil reservoir–separator com-
bines multiple functions into one vessel. The lower half
is the oil reservoir, providing oil storage capacity for the
system and the top portion, a primary oil separation
means. The reservoir also provides limited air storage
for control and gauge actuation.
COMPRESSOR OIL SEPARATOR located in a sepa-
rate housing, consists of a renewable cartridge–type
separator element and provides the final removal of oil
from the air stream. Oil from inside the separator ele-
ments is returned through tubing to the compressor cyl-
inder. (FIGURE 5–9).
Oil carryover through the service lines may be caused
by a faulty oil separator, faulty minimum pressure
valve, over–filling of the oil reservoir, oil that foams, oil
return line malfunction or water condensate in the oil.
If oil carryover occurs, inspect the separator only after
it is determined that the oil level is not too high, the oil