18
SPACE HEATING/COOLING AND DHW
The unit is equipped with an air purge valve (factory
supplied) at the highest location of the unit. If this
location is not the highest of the water installation, air
might be trapped inside the water pipes, which could
cause system malfunction. In that case additional air
ensure no air enters the water circuit.
mean of an external pump and an open circuit to avoid
air bags.
9.3 WATER FILLING
9.3.1 To ll the water circuit
(1)
hydraulic circuit (see “9.1 Additional hydraulic necessary
elements).
(2) Make sure all the valves are open (water inlet/outlet
installation components).
(3) Ensure that the air purge valve of the unit is open when
installation (Loosen the screw cap of air purge valve
properly to completely discharge the air inside and
ensure the air purge valve is open).
(4) Check that the drain pipes connected to the safety valve
(keep the outlet of drain pipes located in the drain pan)
are correctly connected to the general draining system.
The safety valve is later used as an air purging device
(5) Fill the water circuit with water until the pressure
displayed on the controller reaches 2.0 ± 0.2 bar. During
all the operation conditions, the normal pressure range
of water circuit is 1 ~ 2.5 bar.
to operate the safety valve manually so as to help with the air
purging procedure.
(6) Remove as much air from inside the water circuit as
possible through the air purge valve and other air vents
in the installation (fan coils, radiators...).
(7) There are two methods to start the air purge procedure:
a. Using the master controller to start air purge.
(Refer to the master controller manual)
b. Using DSW4-1 of the PCB1:
DSW4-1 ON: Start air purge
DSW4-1 OFF: Stop air purge
(8) If a little quantity of air is still remaining in the water
circuit, it will be removed by the automatic air purge
the air in the installation has been removed, a reduction
of water pressure in the circuit is very likely to occur.
pump until water pressure returns to approximate 2.0
bar.
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