CGWF-SVX01A-EN 33
Installation Mechanical
Flow switches must stop or prevent compressor operation if chilled water flow drops
off drastically. Follow the manufacturer's recommendations for selection and
installation procedures. General guidelines for flow switch installation are outlined
below:
1. Mount the switch upright with a minimum of 5 pipe diameters straight, horizontal
run on each side. Do not install close to elbows, orifices, or valves.
Note: The arrow on the switch must point in the direction of water flow.
2. To prevent switch fluttering, remove all air from the water systems.
Note: The MP provides a 6-second time delay before shutting the unit down on a
loss-of-flow diagnostic. Contact a qualified service organization if nuisance
machine shutdowns persist.
Install a pipe strainer in the evaporator water supply line to protect components from
water-borne debris.
Evaporator Drain.
The evaporator drain connection should be piped to a suitable drain facility to empty
the evaporator during service or shutdown. Provide a shutoff valve in the drain line. If
the evaporator drain connection is not piped, remove the drain plug from its shipping
location in the control panel and install it in the drain connection.
CAUTION
Use Pipe Strainers!
To prevent evaporator or condenser damage, pipe strainers must be
installed in the water supplies to protect components from water born
debris. The Trane Company is not responsible for equipment-only-
damage caused by water born debris.
Condenser Water Piping
Condenser Water Connections.
Condenser water inlet and outlet types, sizes and locations are given in Figure 7 -
Figure 11.
Condenser Piping Components.
Condenser piping components and layout vary, depending on water source and
connection locations. Figure 15 illustrates typical piping components for a well water
(city water) condensing source. Typical components for a cooling tower condensing
source are ALSO shown in Figure 16.
Condenser piping components generally function identically to those in the
evaporator piping system. Refer to “Evaporator Piping”. In addition, cooling tower
systems may include a manual or automatic bypass valve that can alter water flow
rate to maintain condensing pressure. Well (city) water condensing systems should
include a pressure reducing valve and water regulating valve (Figure 15).
A pressure reducing valve should be installed to reduce water pressure entering the
condenser. This is required only if water pressure exceeds 300 psig. This is necessary
to prevent damage to the disc and seat of the water regulating valve that can be
caused by excessive pressure drop through the valve.
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