Gardner Denver PUREAIR EWD99E, Operating And Service Manual

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13-11-608 Page 12
COOLING WATER PIPING - On packages equipped with water-cooled cores, the water inlet and outlet
are located on the base frame side – See “Package Illustrations”, Figure 1-2 and Figure 1-3, pages 2 & 3,
for details. The pipe network shall be sized to support the maximum required water flow, pressure and
temperature limits listed under the “Water Flow Requirements” table.
COOLING WATER CONTROL DEVICES - Water cooled packages may be equipped with the following
optional flow control devices.
Water Flow Regulation Valve (Figure 2-3) – This device is adjustable to compensate for varying cooling
water inlet temperature and pressure, and is to be mounted in the cooling water outlet line. This valve
may be mounted outside the package confines (when acquired as a stand-alone device) or integrated into
the package pipe system (when so acquired from GD, as shown on Parts Manual 13-11-510, "Optional
Water Valve").
To decrease water flow (increase compressor discharge temperature) turn the adjusting screw from left to
right (increase spring tension), and to increase water flow (decrease compressor discharge temperature),
turn the adjusting screw the opposite way. The groove at the lower edge of the adjusting screw is a
visual reference to use with the 0 to 8 index scale. Use the compressor discharge temperature display to
monitor the adjustments made to water flow.
These valves are delicate instruments. 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 take place in
normal maintenance.
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 again, and finally finger-tighten the nut.
An occasional drop of oil on the valve stem, at the packing nut, will prolong packing life.
If the valve malfunctions, check for bends, binding, paint, or corrosion on the valve stem, fouling of the
valve internals, or damage of the capillary assembly. Use a strainer to prevent solids from blocking the
valve.
Water Flow Stop Valve – This magnetic solenoid-operated valve is energized by the package controller
to shut off water flow when the package is not operating – refer to wiring diagrams included in this manual
for interconnection details. This valve may be mounted outside the package confines (when acquired as
a stand-alone device) or integrated into the package pipe system (when so acquired from GD, as shown
on Parts Manual 13-11-510, "Optional Water Valve").
Figure 2-3 – WATER CONTROL VALVE