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ENERGY STAR Homes Northwest
Geothermal Heat Pump Design and Installation Standards
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1.3.4 Thermostat Staging: Resistance electric heat shall not be energized under the
first heating stage of the indoor thermostat. Thermostat indicator lights shall
provide a visible indication when the auxiliary stage or emergency heat is
operating.
1.3.5 Emergency Heat Relay: All indoor thermostats shall include a manual
selector switch to permit all supplemental heaters to be energized under
control of the indoor thermostat (with the bypassed) when the compressor or
refrigerant system is inoperative.
1.4. Design Methods and Compliance
1.4.1 The manufacturer of GSHP equipment shall provide design standards for
minimum ground heat exchanger lengths.
1.4.2 The manufacturer's design procedure shall follow a recognized methodology
such as presented in:
1.4.2.1 Closed-Loop/Ground-Source Heat Pump Systems: Installation
Guide, GSHPA Publication, Oklahoma State University.
1.4.2.2 Data Design Manual for Closed-Loop/Ground-Source Heat Pump
Systems, ASHRAE.
1.4.3 The ground heat exchanger design shall be clearly documented as complying
with manufacturer's standards.
1.5 Equipment Installation
1.5.1 All equipment shall be located and installed according to manufacturer
specifications and guidelines, all applicable codes and standards, and
accepted industry practices.
1.6. Ground Heat Exchanger Materials
1.6.1 Acceptable pipe materials for the underground buried portion of the ground
heat exchanger are polyethylene and polybutylene.
1.6.2 The pipe and fittings of the buried system shall be warranted by the
manufacturer for ground source heat pump service.
1.6.3 Sufficient information shall be permanently marked on the length of the pipe
that allows the pipe to be properly identified.