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ENERGY STAR Homes Northwest
Geothermal Heat Pump Design and Installation Standards
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3.2.3 Manufacturer shall provide a list of all known acceptable materials used in
the closed-loop circulation system. All metal parts contacting the circulating
fluid shall be defined in terms of metallurgical content.
3.2.4 Manufacturer's recommendations should be followed when charging an earth
loop with antifreeze.
3.2.5 In cases where the antifreeze is considered flammable, the antifreeze shall be
diluted with water to a point at which it is nonflammable before it can be
used indoors.
3.2.6 All systems shall be labeled and identified at the service ports. The labels
shall be of a permanent type with the following information:
3.2.6.1 Antifreeze type and concentration
3.2.6.2 Service-date.
3.2.6.3 Company name.
3.2.6.4 Company phone number and responsible party or person.
4.0 GROUND SOURCE HEAT PUMPS
4.1 Water Source Heat Pumps.
4.1.1 Water source heat pumps used in conjunction with ground heat exchangers
shall be certified by the respective manufacturer to operate satisfactorily at
the recommended maximum and minimum entering water temperatures as
set forth in the design of the ground heat exchanger.
4.1.2 The maximum and minimum design entering water temperatures shall not
exceed the manufacturer's published data.
4.1.3 The water source heat pump will be ARI certified under rating ARI 325 for
ground water heat pumps. For ground heat exchanger designed with EWT in
the heating mode of 60 degrees Fahrenheit or greater, ARI 320 is acceptable.
4.1.4 Maximum and minimum entering liquid temperatures will be determined by
the local ground temperatures and acceptable practice and within the
manufacturer's limits.
4.2 Heat Pump Piping and materials.
4.2.1 All indoor piping, including the heat pump water heat exchanger shall be
insulated to prevent condensation.