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How to Use Chillers for Hydronic Heating

Hydronic heating is a domestic heating system that uses hot water circulating in pipes installed beneath the floor, in wall panels and along skirting boards. The source of heat may be a reverse cycle chiller, also called an air source heat pump. This device consists of an evaporator, compressor and condenser, together with a circulating refrigerant. A fan brings outside airflow into the device that, in turn, evaporates a circulating refrigerant. The resulting gas is compressed and increases in temperature. The gas condenses and passes on its heat to the house heating system, leaving a liquid refrigerant that circulates back to the outside airflow.

Things You'll Need

  • Qualified HVAC (Heating, Ventilation and Air Conditioning) installer
  • Reverse cycle chiller
  • Power supply
  • Copper tubing ducts to the heating system
  • Walls brackets
  • Anti-vibration mounts
  • Measuring tape
  • Spade
  • Gravel
  • Power drill and drill bits
  • Anti-vibration flexible tubing
  • Indoor heat exchanger unit
  • Storage tank for domestic hot water
  • Tubing insulation and waterproofing
  • Home insulation
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Instructions

    • 1

      Position the chiller outside on flat, smooth ground or secure wall brackets where there is plenty of space for air supply and servicing. A sunny wall is the best location. Leave a distance of 1 foot between the unit and the wall and ensure that the chiller rests on an anti-vibration mount.

    • 2

      Dig a channel 6 inches wide and 2 inches deep around the unit to provide for condensation run-off. Fill the channel with medium-sized gravel. Channel the water runoff to an external domestic drain.

    • 3

      Drill three access holes through the exterior wall of the house: one for the power supply cable to the chiller and two for the copper tubing from the chiller to the indoor heat exchanger. Enlist the HVAC engineer to install the connections between the chiller, heat exchanger, hot water storage tank and domestic heating system. The flexible tubing dampens vibration from the chiller and is installed outside.

    • 4

      Insulate and waterproof all external tubing and power supply connections from the chiller to the house. Insulate and draft proof your home for the system to work effectively.

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