Evaporator Water Piping - Trane RTAA-70 Installation & Maintenance Manual

Installation — Mechanical

Evaporator Water Piping

Figure 15 illustrates typical evaporator piping components. Components and
layout will vary slightly, depending on the location of connections and the
water source.
CAUTION
Evaporator Damage!
The chilled water connections to the evaporator are to be
"victualic" 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 (when facing the
control panel). 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 180° over the top
of the evaporator.
A vent is provided on the top of the evaporator at the leaving water 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.
CAUTION
Chilled Water Components Damage!
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 must be installed in the entering water line to prevent water-
borne debris from entering the evaporator.
26 RTAA-SVX01A-EN