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Translation from original instructions
2.2.4 Installing the flow switch
Normally the units are equipped with a differential pressure switch between the inlet and the output of the evaporator or
there is a flow switch mounted on the unit’s output.
Where the differential pressure is normally present, a flow switch which must be connected by the installer can be provided
as an accessory.
The "flow switch kit" supplied as an accessory, consists of a "T" joint with female ends 1 ", 1 ¼" or 2" according to the units.
In "flow switch kits" with 1" or 1" ¼ “T” coupling, the water flow sensing paddle is already fitted on the flow switch that has a
cable for the electrical connection, whereas for the kit with 2" “T“ coupling, it is necessary to connect the set of foils adapted
to the pipe diameter and check that they can move freely after installation.
The "T" joint must be inserted on the water line in output from the unit in a straight part of the pipe away from filters, valves
etc. with a distance of at least 5 times the diameter of the pipe both upstream and downstream.
The arrow on the switch must be aligned with the water flow.
The flow switch is factory calibrated for installation on a horizontal pipe.
The push rod must be in the vertical position.
The connections of the flow switch with the terminal board in the electrical control panel must be made using the common
terminal and the one that is normally open when there is no water circulation.
Check the wiring diagram for the terminals intended for the flow switch.
Use a 2 x 1 mm2 cable or at most a 2 x 1.5 mm2 cable, with diameter between 6 and 9 mm, suitable for installation.
Lock the cable in place with cable ties in the section between the flow switch and the inlet to the electrical control panel.
2.2.5 Unit operating in heat pump mode
The performance of units in heat pump operation goes down as the external air temperature falls.
The units can be equipped with anti-freeze heater for heating the exchanger.
This heater starts working with the unit off, when the temperature of the water leaving the evaporator drops below the an-
ti-freeze calibration temperature.