Hisense Hi-Therma Serie Manual De Instalación Y Mantenimiento página 28

SPACE HEATING AND DHW
8.3 WATER FILLING
1) Check that a water check valve (field supplied) with a shut-
off valve (field supplied) is connected to the water filling
point (water inlet connection) for filling the hydraulic circuit
(see "8.1 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.
?
N O T E
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
Water
pump
speed
ON
3WVs
OFF
?
N O T E
• 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.
?
N O T E
• 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.
16
Repeat of 240s
periodically
Seconds