Trane RTRA Series Installation Operation & Maintenance page 12

Figure 8 - Suggested piping for typical RTRA evaporator
Vent
Drain
* = User option
** = Chilled water flow
A pipe strainer should be installed in the entering water line
to prevent water-borne debris from entering the system.
Water pipe should be self supported.
Entering chilled water piping
- Air vents (to bleed air from system).
- Water pressure gauges with shutoff valves
- Vibration eliminators
- Shutoff (isolation) valves
- Thermometers (if desired)
- Cleanout tees
- Pipe strainer
Caution : To prevent tube damage install strainer in
evaporator water inlet piping.
Valved pressure
gauge
Thermometer
Vibration
Flow
eliminator
switch**
Relief valve
Vibration
eliminator
Gate valve
Balancing valve
Leaving chilled water piping
- Air vents (to bleed air from system).
- Water pressure gauges with shutoff valves.
- Vibration eliminators.
- Shutoff (isolation) valves.
- Thermometers.
- Cleanout tees.
- Balancing valve.
- Flow switch (if desired).
Caution : To prevent evaporator damage, do not exceed
14 bar evaporator water pressure.
Evaporator drain
A 3/4" drain connection is located under the outlet end of
the evaporator. This may be connected to a suitable drain
to permit evaporator drainage during unit servicing. A
shutoff valve must be installed on the drain line.
If a drain line is not provided, install the drain plug that is
shipped with the unit.
Evaporator flow switch
Chilled water flow protection is provided by the UCM-CLD
without the need for a chilled water flow switch. A flow
switch for chilled water is strictly discretionary but if not
installed, a signal must be sent to the chiller to indicate that
water flow has been established, eg. chilled water pump
motor starter auxiliaries.
If additional chilled water flow protections is desired, use
a field-installed flow switch or differential pressure switch
with the pump interlock to sense system water flow. Install
and wire the flow switch in series with the chilled water
pump motor starter auxiliaries.
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Thermometer*
Gate valve
Water
strainer