Installation and Maintenance Manual

Installation - Mechanical
RLC-SVX09H-EN 41
Drainage
Locate the unit near a large capacity drain for water vessel
drain-down during shutdown or repair. Condensers and
evaporators are provided with drain connections. Refer to
“Water Piping.” All local and national codes apply.
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.
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 lines to monitor
entering and leaving water temperatures. Install a
balancing valve in leaving water line to control water flow
balance. Install shutoff valves on both entering and
leaving water lines to isolate evaporator for service.
A pipe strainer must be installed in entering water line to
prevent water-borne debris from entering the evaporator.
Reversing Water Boxes
Water boxes on evaporator and condenser can NOT be
rotated or swapped end for end. Altering water boxes will
lead to poor efficiency, poor oil management and possible
freeze-up of evaporator.
Evaporator Piping Components
“Piping components” include all devices and controls
used to provide proper water system operation and unit
operating safety.These components and their general
locations are given below.
Entering Chilled Water Piping - Field Installed
• Air vents (to bleed air from system)
• Water pressure gauges with shutoff valves
• Vibration eliminators
• Shutoff (isolation) valves
• Thermometers (if desired)
• Cleanout tees
• Relief valve
• Pipe strainer
Leaving Chilled Water Piping - Field Installed
• 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 (not required if factory installed flow
switch option is selected)
Evaporator Flow Switch (Optional)
If factory installed flow switch option is selected, switch is
programmed based on the operating conditions
submitted with the order.The leaving evaporator
temperature, fluid type and fluid concentration affect the
selected flow switch. If the operating conditions on the job
site change, the flow switch may need to be replaced.
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:
Equipment Damage!
Do NOT rotate or swap evaporator or condenser water
boxes end-for-end. Altering water boxes can affect
equipment operation and can cause equipment
damage.
Figure 19. RTWD water boxes
NOTICE:
Water Born Debris!
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.
NOTICE:
Evaporator Damage!
The chilled water connections to the evaporator are to
be grooved-pipe 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).