Chiltrix CX34, Installation And Operation Manual

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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.
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.
An “additional volume” tank must be used when there is less than 15 gallons of total system
fluid volume.
Generic design shown below, not all components shown
Buffer Tank
Ducted Air
Handler
Fan Coil
Fan Coil
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 CX34 is 6-7.5 gpm, design
flow is 4.8 gpm. If necessary, a second Chiltrix-provided PWM pump may be added to the loop and controlled by
the CX34. 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, 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 supply pipe before it enter 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.
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