Required Flow-Sensing Devices; Paddle Switches; Water Flow Detection Controller And Sensor - Trane CVHE Installation, Operation And Maintenance Manual

I I n n s s t t a a l l l l a a t t i i o o n n : : W W a a t t e e r r P P i i p p i i n n g g
Install a strainer in the entering side of each piping
circuit to avoid possible tube plugging in the chiller
with debris.

Required Flow-Sensing Devices

Use flow paddle switches (refer to
Switches," p. 28), differential pressure switches, or ifm
efector® flow detection controllers and sensors (refer
to "Water Flow Detection Controller and Sensor," p.
28) in conjunction with the pump interlocks to verify
evaporator and condenser water flows.
To ensure adequate chiller flow protection, wire the
chiller water and condenser water proof of flow devices
per the as-built schematics and submittal, and in
accordance with associated notes.
Unless stated otherwise, all flow sensing devices must
be field supplied. Be sure to follow the manufacturer's
recommendations for device selection and installation.
Also, review the following general flow switch
installation guidelines.

Paddle Switches

Figure 10. Flow paddle switch installation
1. Flow switch body
2. One (1) pipe size larger bushing to avoid paddle
interference
3. Pipe coupling
4. Flow switch paddle
5. Five (5) pipe diameters (no turns or fittings)
Paddle switch installation:
1. Mount the flow paddle switch upright in horizontal
section of pipe. Allow at least five pipe diameters of
straight, horizontal run on each side of the switch.
Whenever possible, avoid locations adjacent to
elbows, orifices, and valves.
2. To ensure that the flow switch operates as
designed, adjust the length of the flow switch
paddle to compensate for the pipe diameter and the
28
"Paddle
height of the coupling used to install the switch.
3. Install the flow switch using a coupling that is large
enough to allow the insertion of a bushing one pipe
diameter larger than the flow switch base as shown
in the preceding figure. This will prevent
interference with the flow switch paddle.
4. Verify that the direction-of-flow arrow on the switch
points in the same direction as actual water flow
through the piping circuit.
5. Remove all air from the piping circuit to prevent
possible flow switch "fluttering".
6. Adjust the flow switch to open when water flow is
less than normal.
Water Flow Detection Controller and
Sensor
I I m m p p o o r r t t a a n n t t : : Before installing the ifm efector ® flow
detection controller and sensor, use a
marker to draw a line on the probe at 3.5 in.
(8.9 cm) from the end of the probe. Do NOT
insert more than 3.5 in. (8.9 cm) of the
probe length into the pipe. Refer to the
following figure.
Figure 11. Installation of ifm efector® ® flow detection
controller and sensor
1. Mount the 1/2-in. NPT adapter in a horizontal or
vertical section of pipe. The maximum distance
from the control panel must not exceed 29.5 ft (9 m)
(see item labeled "1" in the preceding figure). Allow
at least five pipe diameters straight run of pipe
CVHE-SVX02M-EN