Trane Flex II Series Installation Operation & Maintenance page 23

8.8.5 Flow switch installation
To ensure adequate water flow through the evaporator, it is essential to install a flow switch on the water circuit. The flow
switch must be installed on the inlet pipe of the water on which the pump is. The purpose of the flow switch is to stop the
unit in case of an interruption of the water flow while protecting the evaporator from freezing.
The flow switch can be mounted in any position far from elbows or bottlenecks and with the arrow in the direction of flow.
For installations on vertical piping is necessary to calibrate the device to compensate for the weight of the headstock. If
the unit is mounted to the bottom, WARNINGS deposits must be made. The appliance must be installed in a straight pipe
with no filters, valves, etc.
Have at least 5 times its diameter, both upstream and downstream.
Blade type flow switches are available as loose accessories and are suitable for harsh environments and for
pipes with diameters from 1" to 8". The flow switch has a contact which must be wired, by the contractor, on
the jobsite. Check the unit wiring diagram for more information. See the instruction sheet inside the flow
switch box for information about positioning and settings.
Mounting instructions
Dimensions (mm)
Paddle (model without "T" piece)
PIPES TABLES
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