i-32V5
Air/water inverter heat pumps with axial fansi
21
If the unit needs to be drained completely, first close the manual inlet and outlet gate valves (not included in supply) and then detach the pipes
on the outside of the water inlet and outlet to drain liquid from the unit (to make this operation easier, it is recommended to install two drain
valves between the unit and manual gate valves on the outside of the water inlet and outlet).
B
A
If it is necessary to top up the system or adjust the glycol content, the service tap can be used.
Unscrew the cap of the service tap (A) and connect a pipe of 14 or 12 mm (inertial diameter
measurements - check the tap model installed on your unit) connected to the water mains to
the hose connector, then fill the system by unscrewing the ring nut (B). Once the operation is
completed, tighten the ring nut (B) again and screw the cap (A). In any case, it is advisable to
use an external tap to fill the system.
5.7.7 Service sleeves
In the hydraulic circuit of the unit, 2 service sleeves with gap (1/4”G) are installed
dowstream and upstream of the circulator (ref. SM unit functional diagram paragraph
5.6.2); when removing/mounting the cap, use 2 spanners as shown in the figure to
avoid damaging the pipes.
5.7.8 Air venting valve
The unit is fitted with an air venting valve to automatically remove air that has built up in
the circuit, preventing undesirable effects such as premature corrosion and wear, lower
performance and low exchange output.
The device has also a safety function in that, in the event of exchanger breakdown, it
allows the refrigerant gas to escape into the outside air, preventing it from being trans-
ported to the internal terminals.
The valve can be kept in a closed position by closing the plug on the drain; by loosening
the plug, the valve remains in open position and air is vented automatically.
In the event of observing a water leak, it is mandatory to replace the component, by
loosening it with a wrench, as pictured below.
