Page 1 of 5 DUCTLESS HEAT PUMP SPECIFICATIONS 1. NEW EQUIPMENT REQUIREMENTS a. Materials Equipment shall be a split system Ductless Heat Pump (DHP) with an inverter-driven, variable speed compressor, a variable speed outdoor fan, and a multispeed or variable speed indoor blower unit. Equipment shall be manufactured by a company listed in the Air Conditioning, Heating and Refrigeration Institute (AHRI) Unitary Directory. King County Housing Authority (KCHA) promotes sustainability while conducting its weatherization program; the firm (Firm) performing this work for KCHA is encouraged to utilize green materials and products wherever possible and make every effort to recycle waste material. b. Ratings Heat pump equipment shall meet the performance, safety, and rating requirements as given in the latest revision of AHRI Standard 240. Units shall be listed by Underwriters Laboratories or equivalent and shall display the AHRI symbol of certification. The DHP equipment shall be listed by model number on the most current Bonneville Power Administration s Qualified Products List. Last accessed from http://www.bpa.gov/ee/sectors/residential/pages/ductless-heat-pumps.aspx on May 7, 2015. The heat pump equipment shall be rated with an HSPF of 12 or greater. c. Heat Pump Sizing The heat pump system shall be a single head unit sized to displace at least 1,000 square feet of living space with a minimum size of one ton heating capacity (12,000 BTUs at 47 degrees Fahrenheit OD temperature). Sizing of the DHP shall take into consideration the planned thermal improvements to the building through the KCHA weatherization program. d. Warranty Heat pump equipment shall be warranted by the manufacturer against defects in material and workmanship for a minimum of two years from the date of start-up of the equipment. In addition, the compressor shall be warranted by the manufacturer against defects in material and workmanship for a minimum of five years from the date of startup. This warranty should not be considered to cover equipment failure caused by failure to perform normal maintenance, abuse or external causes beyond the control of the Firm. A Statement of Warranty must accompany your invoice and must be provided to the building owner. 2. FIRM REQUIREMENTS a. Training The Firm shall be responsible for the technical competence and qualifications of his or her salespeople, installers, and service technicians. Technicians must attend the Northwest Ductless Program orientation and be listed on the Northwest Ductless website. At least one technician working on the job site must have received certified installation training from the manufacturer of the installed DHP equipment and be certified as a Type II technician as required by 40 CFR Part 82, Subpart F.
b. Electrical - All electrical connections and repairs are to be performed by individuals who, working for a licensed electrical contractor, have received appropriate electrician certifications from the Washington State Department of Labor and Industries (L&I). Electrical repairs are to be conducted under the supervision of an electrical administrator. L&I provides both electrician and administrator certifications for various levels of electrical work. The Firm is responsible for obtaining required certifications and licensing for self-performance of electrical repairs or for subcontracting electrical repairs to a properly licensed electrical contractor. c. Owner Instruction The Firm shall instruct the building owner in proper operation and maintenance of the DHP system. The Firm shall provide the building owner with the manufacturer s owner s manual, demonstrate filter replacement/cleaning and demonstrate the operation of indoor thermostat controls and indicator lights. The Firm shall explain to the building owner the different operating modes of the heat pump system (e.g. heating, cooling, defrost). All this information shall be provided in the owner s manual given to the building owner. The Firm shall instruct the building owner how to operate the DHP in coordination with the existing zonal systems in the home. Instructions shall include adjusting other zonal thermostats so the DHP is the primary heating system. d. Safe Work Practices KCHA is reasonably certain that this work will not disturb lead based paint nor asbestos. All work that may disturb lead based paint must be performed in accordance with federal and state regulations, including the use of Lead Safe Weatherization practices (LSW) and in compliance with the EPA s Renovation, Repair, and Painting Rule (RRP). The Firm must document crew certification for compliance with LSW and RRP. In addition, the Firm must keep abreast of changes in federal or state requirements regarding lead based paint and comply accordingly. Failure to utilize LSW/RRP, where required, may lead to immediate work stoppage, clearance testing, relocation of occupants, clean-up and/or legal claims. The Firm is responsible for costs of activities that arise from a failure to follow the lead safe protocol. 3. NEW EQUIPMENT INSTALLATION Pursue compliance with federal, state, and local building and environmental codes for the installation of this product. Follow manufacturer s installation instructions and specifications. The following specifications are not intended to replace manufacturer s specifications. a. Permits The Firm shall be responsible for all permits required by State and local ordinances for the installation of the heat pump system. The Firm shall provide the building owner and KCHA with copies of all permits related to the work. b. Access Equipment shall be located to allow easy service access and adequate working space for servicing any component without removal of piping or other permanently installed fixtures. Page 2 of 5
Components that require frequent attention, such as filters, shall be located in easily accessible areas. Installations located in attics or crawlspaces are not allowed. c. Location of Indoor Unit Indoor unit shall be located in the main living area of the original mobile home, not an addition, located for best air circulation. Unit shall be installed level and located high on the wall. d. Location and Support of Outdoor Units Outdoor units shall be anchored to risers which are secured with an adhesive and mechanical connection to pads for proper drainage and prevention of water, snow or ice buildup. A minimum clearance shall be provided as per manufacturer s instructions and recommendations. In any installation there shall be a minimum of 3 of free and clear area under the outdoor coil drainage area. Outdoor units shall be located to avoid restrictions in the outdoor airstream. Defrost melt shall not drain onto areas where ice formation may create a hazard (walkways etc.). Outdoor units must be installed level. e. 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. f. 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. g. 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. h. Filters Indoor unit shall come with air filters installed from the factory. i. Ductless The heat pump will be fully ductless. Units using any type of field installed duct system are NOT eligible. 4. NOISE AND VIBRATION ABATEMENT a. 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 Firm shall be responsible for any modifications necessary to reduce noise. Unit base shall not be connected to the foundation. Page 3 of 5
5. REFRIGERANT PIPING This section applies to the copper refrigerant line sets a. Materials Field-supplied refrigerant piping shall be clean, dehydrated, sealed and seamless copper tubing or the manufacturer s pre-charged tubing. Fittings shall be wrought copper. Field supplied tubing shall be evacuated to 500 microns and purged and pressure tested as per manufacturer s recommendation, soft solders shall not be permitted. b. Sizing To maintain oil return to the compressor and avoid inefficiency and capacity loss, refrigeration piping or refrigeration line set shall be sized and installed in accordance with the manufacturer s instructions and recommendations. Piping between the two sections of split units shall not exceed the manufacturer s maximum recommended length, horizontally or vertically, and shall be run parallel to building lines and in a straight and workmanlike manner to prevent oil traps. c. Support Refrigerant piping shall be properly supported in accordance with manufacturer s specifications, AHRI and IMC (International Mechanical Code). d. Penetrations Refrigerant piping passing through openings in the unit cabinet or the building structure shall be installed to prevent wear or sound generation due to contact with the cabinet or building structure. All penetrations in the envelope of the building shall be properly sealed with an insulative sealant. e. Insulation Refrigerant lines shall be insulated with a minimum of ½ thick continuous closed-cell foam rubber. Insulation must cover entire line set length. Where refrigeration line sets run on the exterior of the buildings they shall have a rigid line hide weatherproof covering. f. Leak Testing, Evacuation and Charging Factory as well as field-fabricated joints shall be checked, and any leaks found shall be repaired. Evacuation and charging shall be done in accordance with the manufacturer s instructions and recommendations. 6. CONDENSATE SYSTEM a. Condensate Drain Line shall be sized no smaller than line leaving the indoor unit with proper drain connections, slope downhill to allow for gravity flow of condensate to terminate outside of the buildings. b. Piping Material Condensate drain piping shall meet IMC and should be copper, plastic or other corrosion-resistant material recommended by manufacturer. Page 4 of 5
c. Drains Condensate drain lines shall run to an open drain or location outside of the building foundation. Condensate shall not drain onto areas where ice formation may create a hazard (walkways etc.). Under no circumstances may condensate be drained into a crawl space or direct connected into a sewer line. d. Condensate Pump Condensate pumps are not recommended unless there is no other alternative. If a condensation pump must be installed, follow the manufacturer s installation requirements. 7. INDOOR THERMOSTATS a. Wireless Remote Control A wireless remote control is standard equipment for adjusting the indoor comfort. Wireless remote controls are to be provided to KCHA s property manager. b. Wall Mounted Wired Thermostats Wall mounted wired thermostats are also requested. Indoor thermostats should be located and installed according to the manufacturer s instructions and recommendations. Thermostats are generally installed five feet off the floor and located on an inside wall where they are not exposed at any time to direct sunlight or any other heat source. 8. EXISTING EQUIPMENT a. All existing baseboard heaters and furnaces are to remain operational. Power for the ductless heat pump will be pulled from the extra space in the electrical panel. 9. DAMAGES a. The Firm will be held responsible for any and all damages created during the performance of the work. b. All debris resulting from the work will be removed and legally disposed of with every effort made toward recycling waste material. Page 5 of 5