13–9/10–641 Page 42
FIGURE 5–8 – WATER CONTROL VALVE
after the oil cooler (FIGURE 5–1, page 34). Use the
compressor discharge air temperature gauge on the
instrument panel in setting the flow control valve. The
compressor discharge temperature must be main-
tained a minimum of 10
_
F (5
_
C) above the dew point
temperature at the maximum anticipated ambient; re-
fer to FIGURE 5–9 for the dew point temperature at the
operating pressure and ambient temperature of the ap-
plication.
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 the 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 34) – A magnetic solenoid–oper-
ated water shutoff valve rated at 150 psig (10.3 Bars)
water pressure should be mounted in the water outlet
FIGURE 5–9 – DEW POINT TEMPERATURE VS. AMBIENT TEMPERATURE
(100% RELATIVE HUMIDITY)
