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Flow switch
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
below as
Figure 9 Flow switch
•
Mount the flow switch upright, with a minimum straight and horizontal length of 5 times its internal diameter
before and after it. Or install in a vertical pipe if the flow in the upward direction.
•
Do not install close to elbows, orifices or valves.
•
Refer to
Table 4 Paddle
•
Ensure the paddle arm extends into the main run of the pipe and the arrow on the switch mustpoint in the
direction
water flow after switch tighten to final position.
•
To prevent switch fluttering, remove all air from the water system.
•
Adjust the switch to open when water flow falls below the required minimum shown onthe pressuredrop
curves
10. Flow switch contacts are closed on proof of water flow.
•
Wire flow switches in series with the water pump interlocks as in Trane wiring diagrams.
Note: Dual flow switch for assembly unit RTXC310/330/360/400/440XE, install appropriate water flow
switches at the water outlet of each unit, refer to Section of Master - slave unit.
Table 4 Paddle Size of Water Flow Switch
Evaporator
water pipe
Model
size
RTXC110XE
DN100
RTXC160XE
DN150
RTXC180XE
DN150
RTXC200XE
DN150
RTXC220XE
DN150
Table
installation.
Size, select and trim the paddle to the right length.
Figure 9 Flow switch installation
Recommended main
water pipe size
> DN100
> DN150
> DN150
> DN150
> DN150
4.General guidelines for flow switch installation are outlined
Rated water
Trim to
flow rate(L/s)
Length
A(mm)
28
18
70
28
60
31
51
32
41
36
22
of the
as
Figure
Min water flow
Max water flow
rate(L/s)
rate(L/s)
9.1
27.3
13.9
41.7
15.3
45.9
16.2
48.5
17.9
53.9
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