Sanden GS3-45HPA-US Installation Manual page 8

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This product cannot be connected to a solar water heater.
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The piping must be insulated with ¾" to 1" closed cell insulation.
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Self Regulating Heat tape (3-5W per foot) must be installed on both Water Lines to the
Heat Pump to protect the water piping in areas with freezing temperatures.
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If the piping needs brazing, make sure that all flux and flux splatter is wiped away with
a wet cloth. When brazing, ensure connections are protected using a wet cloth.
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As the hot-water supply pipe will expand and contract, use sleeves when penetrating
through concrete walls or slabs.
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With buried piping, an outer cover will need to be used that has had both ends sealed
to avoid any ingress of rain.
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Use only heat-resistant and corrosive-resistant material to seal the pipe joints.
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Cutting and wrenching the piping material may result in oil and dust adhering to it. After
processing, clean the material with a mild detergent before doing any piping work and
smooth the edges to remove any scratches and burrs. (After flowing water through it
verify whether any debris has accumulated on the filter of the faucet and heat pump
unit pipe.)
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When using PTFE sealing tape, ensure that no tape is sticking out of the threads.

Any heat-resistant PVC piping use is NOT recommended due to high outlet water
temperature for between the heat pump and the tank as well as the tank and the
mixing valve.
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Follow the manufacturer's instruction manual for the type of bond, amount to be
applied, curing time, and other specifications.

If any bond or flux has entered the tank unit and the hot water has a chemical/acrid
smell, take the following countermeasures.
a) After heating the water in the tank unit, drain it and clean inside the tank unit. Fill
the tank unit with 26 gallons (100 litres) of water and exchange twice.
b) Clean or change the filter.
c) Fill up the tank unit.
d) Drain water from the relief valve for one to two minutes.
e) Run water from all the hot water supply faucets in the house for about ten minutes
to clean inside the pipes.
Sanden Heat Pump – Installation Manual
Page 8 of 36