Hisense Hi-Therma Serie Manual De Instalación Y Mantenimiento página 27

SPACE HEATING AND DHW
8.2.4 Additional Information about hydraulic circuit
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An additional special water filter is highly recommended to be
installed on the space heating (field installation), in order to
remove possible particles remaining from brazing which cannot
be removed by the field supplied shut-off valve with filter.
Put insulation on the pipes in order to avoid heat losses.
•
• Whenever possible, sluice valves should be installed for water
piping, in order to minimize flow resistance and to maintain
sufficient water flow.
• Ensure that the installation complies with applicable legislation
in terms of piping connection and materials, hygienic measures,
testing and the possible required use of some specific
components like thermostatic mixing valves.
•
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.
• The water pressure can be read on master controller, detected
by the water pressure sensor located at inlet of plate heat
exchanger. If water pressure exceeded 3 bar, the water pressure
displayed on master controller would flash.
• Ensure that the drain pipes connected to the safety valve and to
the air purge valve are properly driven to avoid water being in
contact with unit components.
Make sure that all field supplied components installed in the
•
piping circuit can withstand the water pressure and the water
temperature range in which the unit can operate. The units are
conceived for exclusive use in a closed water circulation.
• The internal air pressure of the expansion vessel will be
adapted to the water volume of the final installation (factory
supplied with 1 bar of internal air pressure).
• Drain taps must be provided at all low points of the installation
to permit complete drainage of the circuit during servicing.
• The maximum piping length depends on the maximum
pressure availability in the water outlet pipe. Please check the
pump curves.
• 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 purge valves (field supplied) should be
installed to ensure no air enters the water circuit.
For heating floor system, the air should be purged by mean of
•
an external pump and an open circuit to avoid air bags.
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