Specifications include, but are not limited to: Heat Pump Sizing: The heat pump system shall be sized in accordance with the manufacturer’s specifications and applicable codes to ensure adequate heat. If the system provides adequate heat at the winter design temperature, a separate back-up system (supplemental heat) is not required. Otherwise, the system shall be designed to include zonal electric resistance heat (either in unit or as separate zone heaters) up to the total capacity required by the house. Sizing of the DHP shall take into consideration the planned thermal improvements to the building through the weatherization program.; Refrigerant Tubing: Factory tubing flares and fittings are NOT to be reused. Create new flares using appropriate R410a flaring tool and measurement gauge. Apply refrigerant oil to the end of each flare. Connect tubing with R410a nuts (supplied with indoor and outdoor units) using a torque wrench tightened to manufacturer’s specifications.; Refrigerant Charge: Technician shall follow manufacturer’s guidelines when charging a new system and make any needed adjustments for non-standard line set lengths using a programmable refrigerant charging scale.; Electric Wiring: When attached to the exterior walls shall be in conduit to protect them from contact and exposure. All field wiring, line and low voltage, shall comply with the manufacturer’s recommendations, the National Electrical Code and all applicable local codes and ordinances. All interior wiring is to run along walls where possible and along the edge of the ceiling where it is necessary to run on the ceiling.; Filters: Indoor unit shall come with air filters installed from the factory.; Noise and Vibration Abatement: Outdoor units should be located to avoid transmission of objectionable noise to adjacent properties, sleeping areas or other areas where noise control is critical. Outdoor units shall comply with all state and local noise control ordinances. The LA shall be responsible for any modifications necessary to reduce noise. Unit base shall not be connected to the foundation.; Refrigerant Piping: This section applies to the copper refrigerant line sets;
