Hisense Hi-Therma Series Installation & Maintenance Manual page 30

● 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.
s
● The unit will stop for at least 6 min before starting next air purge cycle.
SPACE HEATING/COOLING AND DHW
19
Repeat of 240s
periodically