Trane RTXC-XE Series Installation, Operation And Maintenance Manual page 25

Minimum Water Loop Volume
Flow Switch
RTXC-SVX003D-EN
Equipment Damage!
All inlet and outlet shutoff valves shown in
circulated by Symbio 800 controlled pump to avoid freezing when the units in operation or
standby condition.
Figure 8. Typical chilled water piping system design
Entering Water Piping
• Water strainer
•
Vibration eliminators
• Water pressure gauges with shutoff valves
• Thermometers (if desired)
•
Shutoff (isolation) valves
• Drain valve
Leaving Water Piping
• Drain valve
• Shutoff (isolation) valves
• Vibration eliminators
• Balancing valve
•
Thermometers (if desired)
• Flow switch
• Water pressure gauges with shutoff valves
• Air vents (to bleed air from system)
In order to obtain leaving water temperature stability for comfort cooling applications, a
minimum water loop volume of 20 liters per kW for 110, 130, 140 models and 9 liters per kW for
160, 180, 200, 220, 250, 280 is recommended on all unit sizes. If the total water system volume
lower than required, including water volume of evaporator, water piping and indoor unit, it may
be necessary to add a tank or increase pipe sizes to provide sufficient liquid volume. Any storage
tank that is placed in the water loop should have internal baffles to allow thorough mixing of the
fluid.
To provide protection, install and wire flow switches in series with the water pump interlocks as
required of wiring diagrams. Flow switches must prevent or stop compressor operation if either
system water flow drops off below the required minimum shown on
for flow switch installation are outlined below as
• Mount the flow switch upright, with a minimum of 5 pipe diameters straight, horizontal run
on each side. Or install in a vertical pipe if the flow in the upward direction.
• Do not install close to elbows, orifices, or valves.
CAUTION
Figure 8 should be always open to enable water
Figure 9. Flow Switch
Table 4. General guidelines
Installation.
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