Installation and Maintenance Manual

Installation Mechanical
24 RTAE-SVX001B-EN
Evaporator Piping
RTAE units are available with 2 or 3 pass configurations.
See Figure 16.
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 source.
A vent is provided on the top of the evaporator at the
chilled water inlet. 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.
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
Figure 16. Evaporator pass configurations
2-Pass Evaporators
Control Panel End
Control Panel End
3-Pass Evaporators
Top Vie w
(Condenser removed for clarity)
End View
(Non-control panel end)
Outlet Waterbox
Inlet Waterbox
Top Vie w
(Condenser removed for clarity)
End View
(Non-control panel end)
Inlet Waterbox
(Outlet waterbox
opposite end)
Outlet Water
Connection
Inlet Water
Connection
Outlet
Inlet
NOTICE:
Proper WaterTreatment!
The use of untreated or improperly treated water could
result in scaling, erosion, corrosion, algae or slime. It is
recommended that the services of a qualified water
treatment specialist be engaged to determine what
water treatment, if any, is required. Trane assumes no
responsibility for equipment failures which result from
untreated or improperly treated water, or saline or
brackish water.
NOTICE:
Evaporator Damage!
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).