Chiltrix Inc. www.chiltrix.com
Hydronic Piping and Design Guide
Installation Methods Heating and Cooling (Heating Shown)
Note: Primary Secondary Piping or Closely Spaced Tees are NOT supported or recommended for use with this
heat pump on the supply-side of the buffer tank, or anywhere in a system without a buffer tank.
A buffer tank must be used for radiant heating. A multi-port buffer tank such as VCT37 should be used to
combine multiple heat pumps. Please do not try to balance multiple cx50 units with equal-piping or reverse
return design. It will not work as expected due to having multiple variable speed pumps.
An “additional volume” tank must be used when there is no buffer tanks and there is less than 15 gallons of
total system fluid volume.
Minimum pipe size should be no less than 1”, CPVC or Oxygen Barrier PEX, reverse return piping is preferable to
assist balancing. Reverse-return will not fully balance multiple chillers as the variable speed pumps may not
always operate at the same speed. The installer should calculate the pipe and fitting resistance to determine the
head pressure. See the examples on the following pages, maximum water flow for the cx50 is 6-7.5 gpm, design
flow is 5.2 gpm. If necessary, a second Chiltrix-provided PWM pump may be added to the loop and controlled by
the cx50. The second water pump connections are always in series with the internal pump. The loop example
above is designed with wild coils (loads). Water flows through the fan coils at all times, if there is a call for heating
or cooling the FCU controls will turn the fan on, adjust fan speed, etc. BTU leakage from a wild coil is around the
same as a light bulb, not enough to worry about. Valved options are available and Chiltrix fan coil units can
support valves, or be used to start/stop a pump, contact Chiltrix support to discuss.
An air discharge valve should be installed at the top of the circulation system, if possible, for easy air discharge. As
an alternative an automatic/manual air vent can be used inline before the pumps.
Always install a water filter or wye strainer on the return side pipe before it enters the heat
pump to prevent blockage of the heat exchanger or pump/flow meter problems.
Do not use CPVC if glycol percentage will be above 25%. Do not use PVC.
5
See Design Guide Here
https://www.chiltrix.com/documents/chiller-options.pdf
PLEASE ALWAYS SUBMIT YOUR DESIGN TO
CHILTRIX FOR APROVAL
Generic design, not all components shown.
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