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13-21-616 v00 Page 66
WATER FLOW CONTROL VALVE FOR HEAT EXCHANGER (Optional Equipment)
(Figure 5-10, page 65)
The water flow control valve is adjustable to compensate for varying water inlet temperatures and pressures
and is to be mounted in the water outlet line after the oil cooler (Figure 5-11). Use the compressor discharge
air temperature gauge on the instrument panel in setting the flow control valve. The compressor discharge
temperature must be maintained a minimum of 10
F (5
C) above the dew point temperature at the maximum
anticipated ambient; refer to Figure 5-1 & 5-2, for the dew point temperature at the operating pressure and
ambient temperature of the application.
To decrease water flow
(increase compressor discharge air temperature) turn the adjusting screw from left to
right, increasing spring tension.
To increase water flow
(decrease compressor discharge air temperature) 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 obtaining 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 inlet
water line is recommended.
Figure 5-11 FLOW DIAGRAM - WATER COOLED SYSTEM