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9.3 WATER FILLING
(1) Check that a water check valve (field supplied) with
a shutoff valve (field supplied) is connected to the
water filling point (water inlet connection) for filling the
hydraulic circuit (see "9.1 Additional hydraulic necessary
elements).
(2) Make sure all the valves are open (water inlet/outlet
shut-off valves and the rest of valves of the water circuit
installation components).
(3) Ensure that the air purge valve of the unit is open when
installation (turn the screw cap of air purge valve twice
at least).
(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
during the water filling procedure.
(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.
While the system is being filled with water, it is highly recommended
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
s
The unit will stop for at least 6 min before starting next air purge cycle.
(8) If a little quantity of air is still remaining in the water
circuit, it will be removed by the automatic air purge
valve of the unit during the first hours of operation. Once
the air in the installation has been removed, a reduction
of water pressure in the circuit is very likely to occur.
Therefore, additional water should be filled by booster
pump until water pressure returns to approximate 2.0
bar.
●
The unit is equipped with an automatic air purge valve (factory
supplied) at the highest location of the unit. Anyway, if there
are higher points in the water installation, air might be trapped
inside water pipes, which could cause system malfunction. In
that case, additional air purge valves (field supplied) should
be installed to ensure no air enters into the water circuit. The
air purge valve should be located at points which are easily
accessible for servicing.
●
The water pressure indicated on the master controller may vary
depending on the water temperature (the higher temperature,
the higher pressure). Nevertheless, it must remain above 1 bar
in order to prevent air from entering the circuit.
●
Fill in the circuit with tap water. The water in the heating
installation must comply with EN directive 98/83 EC.
Non-sanitary controlled water is not recommended (for
example, water from wells, rivers, lakes, etc.) .
●
The maximum water pressure is 3 bar (nominal opening
pressure of the safety valve). Provide adequate reduction
pressure device in the water circuit to ensure that the maximum
pressure is NOT exceeded.
●
For heating floor system, air should be purged by means of an
external pump and an open circuit to prevent the formation of
air pockets.
●
Check carefully for leaks in the water circuit, connections and
circuit elements.
●
During water filling, it is necessary to ensure that water
enters the unit from the water inlet to ensure that all water
passes through the shut-off valve with filter to filter impurities,
otherwise it may block the components inside the unit.
17
REFRIGERANT CIRCUIT
Repeat of 240s
periodically
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