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Installation Mechanical
Water Pressure Gauges and Thermometers
Install field-supplied thermometers and pressure gauges
(with manifolds, whenever practical) as shown in
Figure 13, p.
30. Locate pressure gauges or taps in a
straight run of pipe; avoid placement near elbows, etc. 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
NOTICE
Evaporator Damage!
Failure to follow instructions below could cause
damage to the evaporator.
To prevent evaporator damage, install pressure relief
valves in the evaporator water system.
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 on a water temperature
increase. Refer to applicable codes for relief valve
installation guidelines.
Flow Sensing Devices
Note: The installer must provide flow switches or
differential pressure switches with pump interlocks
to sense system water flow. Flow switch locations
are schematically shown in
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.
Flow switches must stop or prevent compressor operation
if either system water flow drops off below the required
minimum shown on the pressure drop curves. Follow the
manufacturer's recommendations for selection and
installation procedures. General guidelines for flow switch
installation are outlined below.
•
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 the water flow.
•
To prevent switch fluttering, remove all air from the
water system
Note: The Symbio™ 800 provides a 6-second time delay
on the flow switch input before shutting down the
unit on a loss-of-flow diagnostic. Contact a
34
Figure 13, p.
30.
qualified service organization if nuisance machine
shutdowns persist.
•
Adjust the switch to open when water flow falls below
nominal. See
"General Information," p.
tables for minimum flow recommendations for
specific water pass arrangements. Flow switch
contacts are closed on proof of water flow.
Refrigerant Pressure Relief Valve Venting
WARNING
Confined Space Hazards!
Failure to follow instructions below could result in
death or serious injury.
Do not work in confined spaces where refrigerant or
other hazardous, toxic, or flammable gas may be
leaking. Refrigerant or other gases could displace
available oxygen to breathe, causing possible
asphyxiation or other serious health risks. Some gases
may be flammable and/or explosive. If a leak in such
spaces is detected, evacuate the area immediately and
contact the proper rescue or response authority.
Note: Vent pipe size must conform to the ANSI/ASHRAE
Standard 15 for vent pipe sizing. All federal, state,
and local codes take precedence over any
suggestions stated in this manual.
All relief valve venting is the responsibility of the installing
contractor.
All RTHD units use evaporator, compressor, and
condenser pressure relief valves
must be vented to the outside of the building.
Relief valve connection sizes and locations are shown in
the unit submittals. Refer to local codes for relief valve
vent line sizing information.
NOTICE
Equipment Damage!
Failure to comply with specifications may result in
capacity reduction, unit damage and/or relief valve
damage.
Do NOT exceed vent piping code specifications!
Relief valve discharge setpoints and capacities rates are
given in
Table 8.
Once the relief valve has opened, it will re-
close when pressure is reduced to a safe level.
Note: Once opened, relief valves may have tendency to
leak and must be replaced.
9, general data
(Figure 17, p.
35) that
RTHD-SVX01K-EN
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