Evaporator Piping - Trane RTAA-130 Installation, Operation And Maintenance Manual

Figure 22
Suggested Piping for
Typical RTAA Evaporator
Vents
Union
Drain
Vibration
Eliminator

Evaporator Piping

Figure 22 illustrates typical evaporator
piping components. Components and
layout will vary slightly, depending on
the location of connections and the
water source.
Caution: 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 internal
damage to the evaporator.
The chilled water connections are on
the left side of the unit. If it is necessary
for the chilled water piping to enter the
unit from the right side, elbows can be
used to route the piping 1800 over the
top of the evaporator, as shown in
Figure 22, for RTAA 130-200 units only.
A vent is provided on the top of the
evaporator at the return end. Be sure to
provide additional vents at high points
in the piping to bleed air from the
chilled water system. Install necessary
pressure gauges to monitor the
entering and leaving chilled water
pressures.
Valved
Pressure
Gauge
Vibration
Eliminator
Union
Flow
Gate Valve
Switch
(Optional) Balancing Valve
41
Caution: To prevent damage to
chilled water components, do not
allow evaporator pressure
(maximum working pressure) to
exceed 215 psig.
Provide shutoff 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 temperatures. Install a balancing
valve in the 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.
A pipe strainer should be installed in
the entering water line to prevent
waterborne debris from entering the
evaporator.
Gate Valve
Water
Strainer
RTAA 130-200
with Opposite-Side Connections
(View from end opposite control panel)
RTAA-IOM-3