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AirFoX Desuperheater Water Heater  


Heat Water with your A/C or Heat-Pump –
By reclaiming your Air Conditioning Wasted Heat Energy! 

HEAT RECOVERY UNIT FOR DOMESTIC HOT WATER
FROM RESIDENTIAL AND COMMERCIAL HVAC SYSTEMS 

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The AirFoX Heat Recovery Unit (desuperheater) captures waste heat discharged from the refrigerant cycle in an Air Conditioning or Heat Pump system. Then transfers that heat into the water heater tank - creating hot water.  Not only does the AirFoX reduce the amount of energy required to provide hot water, it also improves the cooling efficiency of the Air Conditioner or Heat Pump while it is operating.

The refrigerant side of the AirFoX is installed in the refrigerant hot gas line between the compressor and condenser.  If installed on a Heat Pump System - between the compressor and reversing valve. The water side  is connected to the water heater tank to form a circulation loop. Power is drawn from the compressor contactor. Waste heat may be collected when the compressor operates, and the water circulating from the water heater tank is less than 140ºF. A minimum refrigerant temperature of 125ºF is also required to allow Heat Recovery Operation.
 


 

AirFoX Residential Unit

 

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INSTALLATION

Refrigerant: Run copper hot gas line from the A/C compressor to the AirFoX and back to the condensor coil. See installation instruction for line sizing -never reduce hot gas line size below that in the A/C. On Heat Pumps: run the line from the compressor to the AirFoX and back to the heat pump ahead of the 4 way reversing valve.  When possible install above compressor. Insulate all lines.

Water: Run lines above ground or roof on 4x4" blocks.  Place check valve in water line (out) on muliti-unit applications to prevent recirculation.Use copper pipe for longest life.

Cabinet: May be installed horizontally or vertically. Never install with pump or access door facing down.


SG AirFoX Installation Diagram-Model B


APPLICATION CAUTION: Installations subject to freezing ambients must make provision for freeze protection. Heat Recovery Units containing freezestats must draw power from the line side of the compressor contactor. Drainable hand valves are a more positive freeze protection approach.


  SPECIFICATIONS AND INFORMATION

MOUNTING/LOCATION: Heat Recovery Units may be mounted indoors or outdoors. They must be mounted vertically, at a height above the top of the condenser. While normally located outdoors near the air conditioning equipment, they can be located in any convenient place, such as the garage or laundry room; but the refrigerant run should be kept to a minimum.

CONTROLS: All models contain a water high limit control. It is factory set to 140ºF. Models also contain a refrigerant gas low limit. It is factory set to 125ºF. Models with optional freeze-protection are equipped with a water low limit. It is factory set to 50ºF, and is designed to operate when water temperatures of 40ºF or less are detected, in order to provide water circulation independent of compressor operation, in the event of freezing ambients.

HEAT EXCHANGER: Heat Recovery Units contain a corrosion resistant all-copper double wall heat exchanger of counterflow twin tube design. Continuously vented along its entire length, the Heat Exchanger meets strict IAPMO safety criteria, and exceeds UL requirements. Operating pressure, 650 psig, refrigerant, 150 psig water side (for use with R-12, 22, 410, 500 and 502.)

CIRCULATOR PUMP: Heat Recovery Units contain a low wattage wet rotor in-line single stage circulator. Standard Models use a Taco 006 series circulator. This water cooled pump is rated at 90 watts, 230 volts and 0.40 amps. It is designed for 125 psi working pressure and up to 220ºF fluid temperature. The pump housing is bronze and the bearings are ceramic.

Warranty Heat Recovery Units offer a limited Parts Warranty as follows:
Heat Exchanger- 5 Years;Pump- 3 Years; All other components- 1 Year.

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