4.1- Fresh water circuit

Important notice: The fresh water circulation must be adequate to the fan coil capacity.Check that this capacity is > or = as to the value specified on the central unit.The compressor cannot run without fresh water circulation. Reduced or no water circu-lation will cause freezing situation and might damage the evaporator coil because of ice.The following safeties prevent the unit to be damaged by the lack of fresh water circula-tion. a) Antifreeze solution: b) Safety flow switch (option): The fresh water circuit must be filled with water and antifreeze solution (20%). The addition of antifreeze lowers the freezing point of the water and adds an additional safety to the circuit. Check that the fresh water circuit pressure gauge shows 1,5 bars. This device stops the unit if the water flow stops below the preset minimum. As explained at chapter 3.2, a safety flow switch is installed in the fresh water circuit outlet manifold. It is very important to make sure that this safety device is properly wired to the control box: To do this, it is possible to simulate a lack of fresh water flow just pushing the lever inside the switch protecting cup. Warning: The flow switch is connected to the main electri- cal box and this check must be done by expert engineers only, keeping in mind all the safety precautions.
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