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Pre-Installation Check List 1. Unit application sizing and plumbing planning Refer to this manual for information on the sizing and requirements/limitations for the specific application required. If in doubt, call technical support for advice. 2. Electrical Requirements The outdoor unit should be fed with mains power from the breaker and local disconnect (per NEC code). Wire sizing should be calculated based on Minimum Circuit Ampacity and wire length. The unit has a 16ft thermistor cable as standard, use a 16-2 AWG shielded wire to extend the thermistor cable from the heat pump unit to the tank. Ensure the breaker size and voltage is correct for the system. Sanden units do not have start components for the compressor, and therefore they rely on the correct power and amperage supply to start: Unit GS3-45HPA-US GUS-A45HPA Power Supply 208/230V-1Ph-60Hz 208/230V-1Ph-60Hz Breaker Size 15 Amps 15 Amps Voltage tolerance is 187V to 253V. 3. Pipe Length and Sizes Ensure that the maximum piping lengths are observed or the system will not operate correctly and will likely experience premature failure of its components. Do not upsize or alter the piping length from those published as Sanden cannot guarantee operation with incorrectly installed pipe. For a GS3-A45HPA unit the pipe length should not extend more than 50 feet in length with 16 feet in height or elevation, with a maximum of 6 bends in each pipe run between the tank and heat pump unit. Water supply to the tank, and from the tank to the building MUST be a minimum of 3⁄4” and should be either copper or PEX piping, depending on local code requirements The piping size between the heat pump and tank unit MUST be 1⁄2” diameter and should be either copper or PEX piping. 14PDF Image | Sanden SANCO2 Heat Pump Water Heater 2017
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