Polytropic PAC 16 Manuel D'instructions page 24

Polytropic
Water connection
Generalities
The heat pump is connected to a filtration circuit with a by-pass.
It is imperative that the by-pass is placed after the pump and the filter.
The by-pass generally consists of 3 valves.
This makes it possible to regulate the water flow which passes through the heat
pump and to isolate the heat pump completely for any maintenance work, without
cutting the flow of filtered water.
If your installation is equipped of a water treatment with product adductions
(chlorine, brominates, salt...) the by-pass must be installed before the water
treatment, with a non-return valve between the by-pass and water treatment.
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