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Each unit is therefore fitted with a hole on the base of the hydronic kit (on the coil side) to drain condensation which could drip
from the pipes of the plumbing system. Since these pipes are well insulated, a minimum amount of condensation is produced
anyway and therefore it is not mandatory to connect a drain pipe to this fitting.
5.6.5
Filling the system
CAUTION: supervise all filling/top-up operations.
CAUTION: before filling/topping up the system, disconnect power to the units.
CAUTION: the system must always be filled/topped up in controlled pressure conditions (max 1 bar). Make sure
that a pressure reducer and safety valve have been installed on the filling/top-up line.
CAUTION: the water on the filling/top-up line must be appropriately pre-filtered from any impurities and
suspended particles. Make sure that a removable cartridge filter and dirt separator are installed on the line.
CAUTION: regularly check and vent the air built up in the system.
CAUTION: install an automatic air venting valve at the highest point of the system.
5.6.6
Discharge of the plant
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).
5.6.7
Service sleeves
2 service sleeves with cap (1/4”G) are installed in the unit’s water circuit, downstream and
upstream of the circulator (ref. SM unit functional diagram paragraph 5.6.2); when
disassembling/fitting on the cap use 2 spanners as pictured to prevent damaging the pipes.
5.6.8
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 also features a safety function because, in the event of exchanger breakdown, it allows
the refrigerant gas to escape outside, preventing it fro being conveyed 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.
When it is required to top up the circuit or to adapt the glycol level, please use the service
valve. Unscrew and remove the cap from the service valve and connect a 14 or 12 mm
pipe (inside diameter - check the valve model installed on your unit), connected to the
water mains, to the hose connector and then drain the circuit by unscrewing the specific
ring nut. After the end of the operation, retighten the ring nut and screw the cap back on.
In any case it is recommended to use an external valve to fill the system which can be set
up by the installer.
Cap with gasket
Ring nut
