CVGF-SVN02B-E4
52
Installation:
Mechanical
Figure 12. Typical thermometer, valving, and manifold pressure gauge set-up
Evaporator
waterflow
Pressure
differential
gauge
Thermometers
Relief
valve
Shutoff
valves
Manifold
Flow
switch
Relief
valve
Condenser
water flow
Pressure
differential
gauge
Thermometers
Shutoff
valves
Manifold
Flow switch
Isolation
valves
Water Pressure Gauges
and Thermometers
I
nstall field-supplied
thermometers and pressure
gauges (with manifolds
whenever practical) as shown in
Figure 12. Locate pressure
gauges or taps in a straight run
of pipe; avoid placement near
elbows, and so forth. Be sure to
install the gauges at the same
elevation on each shell if the
shells have opposite-end water
connections.
To read manifolded water
pressure gauges, open one valve
and close the other (depending
upon the reading desired). This
eliminates errors resulting from
differently calibrated gauges
installed at unmatched
elevations.
Water Pressure-Relief
Valves
CAUTION
Shell Damage!
Install a pressure-relief valve in
both the evaporator and
condenser water systems.
Failure to do so could result in
shell damage.
Install a water pressure-relief
valve in one of the condenser,
and one of the evaporator, water
box drain connections, or on the
shell side of any shutoff valve.
Water vessels with close-
coupled shutoff valves have a
high potential for hydrostatic
pressure buildup during a water
temperature increase. Refer to
applicable codes for pressure-
relief valve installation
guidelines.
Flow-Sensing Devices
Use field provided flow switches
or differential pressure switches
with pump interlocks to sense
system water flow. Flow switch
locations are schematically
shown in Figure 12.
To provide chiller protection,
install and wire flow switches in
series with the water pump
interlocks, for both chilled-water
and condenser-water circuits
(refer to the Installation Electrical
section). Specific connections
and schematic wiring diagrams
are shipped with the unit.
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