Chiltrix AC series Heating & Cooling series CX30, Installation And Operation Manual

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Chiltrix Inc. www.Chiltrix.com
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Purging Air from the Fan Coils
Close the input valve to each fan coil except the first coil (1). Turn the pump on and run it, when
the bubbles stop coming out of the discharge hose turn on the ball valve on coil (2), wait for the
bubbles to stop, then do the same for coil number (3), then (4). All CX Chillers have a flow switch
installed in the loop. Air in the system may cause a flow switch alarm; the controller will display a
P5 or P6 error code.
All CXI fan coils have an air purge screw near the water inlet port, always purge the fan coils before
starting the chiller.
The CX30 chiller also has a bleeder valve with a ¼” clear tube attached to it located near the brazed
plate heat exchanger.
Proper and even flow through each fan coil is critical for both heating and cooling. This can be done
with balance valves or ball valves installed at each fan coil supply or return pipe. Set each fan coil to
the same temperature and fan speed. Using an accurate digital thermometer adjust each ball valve
until the coil return temperatures are even. This must be done in heating mode so proper flow can
be verified to protect the heat exchanger from freezing up in cooling mode.
If a fan coil is powered on but the fan isn’t running, there is a good possibility that there is air trapped in
that particular part of the loop.