Trane R Series, Installation Operation & Maintenance

Page: 33 / 188

RLC-SVX07A-EN 33
Installation - Mechanical
CAUTION
Use Piping Strainers!
To prevent evaporator or condenser damage, pipe strainers must
be installed in the water supplies to protect components from
water born debris. Trane is not responsible for equipment-only-
damage caused by water born debris.
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
Equipment Damage!
To prevent evaporator damage, do not exceed 215 psig (14.6 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.
Chilled Water Flow Switch
On RTWA and RTUA units, chilled water flow protection is provided by the
UCM 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 auxiliary contacts, building automation system,
etc.
If additional chilled water flow protection is desired, use a field-installed flow
switch or differential pressure switch, with the pump motor starter auxiliary
contacts, to sense system water flow. Install and wire the flow switch in
series with the chilled water pump motor starter auxiliaries (refer to
Paragraph
"Interconnecting Wiring" on Page 62 .
Specific connection and schematic wiring diagrams are shipped with the unit.
Some piping and control schemes, particularly those using a single water
pump for both chilled and hot water, must be analyzed to determine how and
or if a flow sensing device will provide desired operation.
Follow the manufacturer's recommendations for selection and installation
procedures. General guidelines for flow switch installation are outlined below:
1. Mount the switch upright, with a minimum of 5 pipe diameters of straight
horizontal run on each side. Do not install close to elbows, orifices or
valves.