Installation and Maintenance Manual

Installation - Mechanical
42 RLC-SVX09H-EN
The sensor head includes 3 LEDs, two yellow and one
green.Wait 15 seconds after power is applied to the sensor
before evaluating LEDs for flow status. When wired
correctly and flow is established, only the green LED
should be lit. Following are the LED indicators:
• Green ON, both yellow OFF — Flow
• Green and outside yellow ON — No Flow
• Center yellow ON continuously — Miswire
Important: If using an acidic commercial flushing
solution, construct a temporary bypass
around the unit to prevent damage to
internal components of the evaporator.
Dirt, scale, products of corrosion and other foreign
material will adversely affect heat transfer between the
water and system components. Foreign matter in the
chilled water system can also increase pressure drop and,
consequently, reduce water flow. Proper water treatment
must be determined locally, depending on the type of
system and local water characteristics.
Neither salt nor brackish water is recommended for use in
Trane air-cooled Series R
®
chillers. Use of either will lead
to a shortened life to an indeterminable degree.TheTrane
Company encourages the employment of a reputable
water treatment specialist, familiar with local water
conditions, to assist in this determination and in the
establishment of a proper water treatment program.
Using untreated or improperly treated water in these units
may result in inefficient operation and possible tube
damage. Consult a qualified water treatment specialist to
determine whether treatment is needed.
Indexing Flow Switch
To properly index the flow switch, the following
requirements must be met:
• Dot must be at a position no greater than 90° off Index.
• Torque must be between 22 ft-lb min and 74 ft-lb max.
• A minimum distance of 5x pipe diameter must be
maintained between flow switch and any bends,
valves, changes in cross sections, etc.
Flow Proving Devices
Important: If factory installed flow switch option is not
selected, installer must provide flow
switches or differential pressure switches
with pump interlocks to prove water flow.
To provide chiller protection, install and wire flow switches
in series with the water pump interlocks, for both chilled
water and condenser water circuits (see “Installation -
Electrical” chapter). Specific connections and schematic
wiring diagrams are shipped with the unit.
Flow switches must prevent or stop compressor operation
if either system water flow drops off below the required
minimum shown on the pressure drop curves. Follow the
manufacturer’s recommendations for selection and
installation procedures. General guidelines for flow switch
installation are outlined below.
• Mount the switch upright, with a minimum of 5 pipe
diameters straight, horizontal run on each side.
• Do not install close to elbows, orifices or valves.
Note: The arrow on switch must point in direction of
water flow.
• To prevent switch fluttering, remove all air from water
system.
Note: CH530 provides a 6-sec time delay on flow switch
input before shutting down unit on loss-of-flow
diagnostic. Contact a qualified service organization
if nuisance machine shutdowns persist.
• Adjust switch to open when water flow falls below
minimum. See General Data tables for minimum flow
recommendations. Flow switch is closed on proof of
water flow.
NOTICE:
Proper WaterTreatment!
The use of untreated or improperly treated water in this
equipment 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.
Figure 20. Proper flow switch indexing
NOTICE:
Evaporator Damage!
For all RTUD units, chilled water pumps MUST be
controlled by the Trane CH530 to avoid catastrophic
damage to the evaporator due to freezing.
NOTICE:
Evaporator Damage!
To prevent evaporator damage, do not use water flow
switch to cycle the system.
Flow
Top Vi e w
Index
The flow switch must have the dot in the shaded area
to the left of this line for proper indexing (±90° off Index)