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General Piping Information
Evaporator water connections are grooved.
Thoroughly flush all water piping to the unit before
making the final piping connections to the unit.
Components and layout will vary slightly, depending on
the location of connections and the water sources. See
"Component Locations," p. 9
An air vent is located on each evaporator waterbox. See
Figure 11, p.
28. Be sure to provide additional air vents at
the highest points in the piping to remove air from the
chilled water system. Install necessary pressure gauges to
monitor the entering and leaving chilled water pressure.
Provide shut off valves in lines to the gauges to isolate
them from the system when they are not in use. Use
rubber vibration eliminators to prevent vibration
transmission through the water lines.
If desired, install thermometers in the lines to monitor
entering and leaving water line to control water flow
balance. Install shutoff valves on both the entering and
leaving water lines so that the evaporator can be isolated
for service.
To prevent damage to chilled-water components, do not
allow evaporator pressure (maximum working pressure)
to exceed 150 psi (10.5 bar).
Figure 12. Evaporator water piping
6
5
8
1
Bypass Valve
2
Isolation Valve
3
Vibration Isolators
4
Evaporator - End View (2-pass)
5
Evaporator Waterbox
6
Vent
7
Strainer
8
Drain
RTAF-SVX001K-EN
for more information.
4
7
B
2
2
8
C
Note: When free-cooling option is selected, waterside
working pressure is 90 psig.
A pipe strainer must be installed in the entering water line.
Failure to do so can allow waterborne debris to enter the
evaporator.
NOTICE
Evaporator Damage!
Failure to follow instructions below could cause
damage to the evaporator.
The chilled water connections to the evaporator are to
be "victaulic" type connections. Do not attempt to
weld these connections, as the heat generated from
welding can cause microscopic and macroscopic
fractures on the cast iron waterboxes that can lead to
premature failure of the waterbox. To prevent damage
to chilled water components, do not allow evaporator
pressure (maximum working pressure) to exceed 150
psig (10.5 bar).
Evaporator Piping Components
Piping components include all devices and controls used
to provide proper water system operation and unit
operating safety. A typical RTAF evaporator piping is
shown below.
2
3
A
2
3
Pi
Pressure Gauge
FT
Water Flow Switch
T1
Evaporator Water Inlet Temperature Sensor
T2
Evaporator Water Outlet Temperature Sensor
A
Isolate unit for initial water loop cleaning
B
Vent must be installed at the high point of the line
C
Drains must be installed at the low point of the line
Installation Mechanical
1
A
A
29
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