Installation - Mechanical
52 RTAC-SVX01J-EN
Water Pressure Gauges
Install field-supplied pressure components as shown in
Figure 22, p. 52. 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.
Note: Once the unit is installed at a site, one vertical or
one diagonal unit support can be permanently
removed if it creates an obstruction for water
piping.
To read manifolded 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
Install a water pressure relief valve in the evaporator inlet
piping between the evaporator and the inlet shutoff valve,
as shown in Figure 22, p. 52. 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.
Freeze Protection
Depending on ambient temperature the unit may be
exposed to, there are multiple options for freeze
protection.They are listed in order of highest ambient
(least freeze protection) to lowest ambient (most freeze
protection).
Note: A secondary set of pump interlock is strongly
recommended, but not required.
1. Water pump AND heaters
a. Heaters are factory-installed on the evaporator and
water piping and will protect them from freezing in
ambient temperatures down to -20°F (-29°C).
b. Install heat tape on all water piping, pumps, and
other components that may be damaged if exposed
to freezing temperatures. Heat tape must be
designed for low ambient temperature
applications. Heat tape selection should be based
on the lowest expected ambient temperature.
Important: Heaters alone will provide low ambient
protection down to -20°F (-29°C), but will
NOT protect the evaporator from freezing as
a result of charge migration.Therefore, it is
required that water pump control be
used in conjunction with heaters.
c. CH530 controller can start the pump when freezing
conditions are detected. For this option the pump
must to be controlled by the RTAC unit and this
function must be validated.
d. Water circuit valves need to stay open at all times.
e. Verify heat tape is installed as noted in Step b.
Note: Water pump control and heater combination will
protect the evaporator down to any ambient
Figure 22. Suggested piping for typical RTAC evaporator
Flow Switch
(Factory Installed)
NOTICE:
Evaporator Damage!
To prevent shell damage, install pressure relief valves in
the evaporator water system.
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