Flow Switch Installation - Trane CGCN Installation Operation & Maintenance

Flow switch installation

To ensure correct water flow through the evaporator, install a flow switch on the water circuit. The flow switch may
be either installed on both the inlet pipe of the water on that output. 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. If the unit is
equipped with total heat recovery, install another flow switch to ensure the flow of water before it is modified unit
operation in heating mode (Heat Recovery Mode). The flow on recovery circuit prevents shutting down the unit for
high pressure.
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, we must pay attention that deposits that can form. 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.
A flow meter specially selected for this purpose, is offered optionally. This flow switch, the blade type, is suitable
for applications in harsh environments and suitable for pipes with diameters from 1 "to 8". The flow switch is
provided with a contact which must be wired to terminals 11B and 12 (evaporator) of the terminal X (check the
wiring diagram of the car for more information). For more information on the positioning and settings of the device,
read the instruction sheet specific place inside the box of the device.
Electrical connection
Connect to the contact to the white and red of the micro-switch (fig. 1). The red-white contact opens when the flow
drops below the set value. In the absence of flow the contact red-blue closes and can be used as a contact signal
or alarm.