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.................................................... 1 1.4. DESIGN METHODS AND COMPLIANCE................................................................................ 2 1.5 EQUIPMENT INSTALLATION................................................................................................ 2 1.6. GROUND HEAT EXCHANGER MATERIALS.......................................................................... 2 1.7 PIPE JOINING METHODS ...................................................................................................... 3 1.8 FLUSHING, PURGING, PRESSURE AND FLOW TESTING ....................................................... 3 1.9 PIPING ARRANGEMENT ....................................................................................................... 4 2.0 PIPE PLACEMENT AND BACKFILLING ................................................................. 4 2.1. HORIZONTAL SYSTEMS ...................................................................................................... 4 2.2 VERTICAL BORE HOLES. .................................................................................................... 4 3.0 INDOOR PIPING AND CIRCULATION SYSTEM.................................................... 5 3.1 CIRCULATOR SIZING AND SYSTEM AND COMPONENTS ..................................................... 5 3.2. ANTIFREEZE SELECTION AND USE. .................................................................................... 5 4.0 GROUND SOURCE HEAT PUMPS.............................................................................. 6 4.1 WATER SOURCE HEAT PUMPS............................................................................................ 6 4.2 HEAT PUMP PIPING AND MATERIALS. ................................................................................ 6 5.0 COMMISSIONING AND VERIFICATION FOR GROUND SOURCE HEAT PUMPS .............................................................................................................................. 7 ENERGY STAR Homes Northwest Geothermal Heat Pump Design and Installation Standards 1.0 CLOSED LOOP GROUND HEAT EXCHANGERS 1.1 Installation Personnel and Training Required. 1.1.1 The loop contractor shall have a certified installer (technician) trained by IGSHPA or an IGSHPA certified manufacturer's training program. 1.1.2 Ground heat exchanger fabricators shall have completed a heat fusion school in which each participant has performed a heat fusion procedure under direct supervision of an IGSHPA Association Certified Heat Fusion Technician or DOT certified heat fusion technician. 1.1.3 Certified technicians shall attend a retraining school annually. A single failure of a fusion joint will void the certification, and the technician shall be retested to demonstrate satisfactory performance. 1.1.4 Local and State laws and ordinances as they pertain to buried pipe systems shall be strictly followed, or the necessary variance obtained from the proper jurisdiction. 1.2 System Sizing 1.2.1 The recommended method and form for heating and cooling load calculations is available in the Air Conditioning Contractors of America (ACCA) Manual J. This or an equivalent method shall be performed using Component U-values and F-values in the heat loss and heat gain coefficients that reflect the actual construction of the building. Heating loss calculations shall be made using 70°F indoor design temperature. The recommended ASHRAE winter design temperature and cooling design temperature for the nearest weather station representative of the installation shall be used. Heat pump system shall be sized to meet or exceed the heating design load of the house. Installed auxiliary heating shall not exceed 150% of the heating design load. All supplemental heaters greater than 5 kW shall be staged. Sizing documentation shall be provided to the ENERGY STAR Homes Northwest Verifier. 1.3 Thermostats 1.3.1 An electronic thermostat shall be installed to control the heating and cooling system. Thermostats used for both heating and cooling shall have a manual changeover feature or heating/cooling lockout to prevent cross-cycling between heating and cooling. 1.3.2 Heat Pump Thermostat Capability: Heat pump thermostats shall have the capability of supporting a lock out to limit supplemental heater use. The thermostat shall have a minimum of two stage heating control. ENERGY STAR Homes Northwest Geothermal Heat Pump Design and Installation Standards 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...