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9
Overview of the unit
Notes:
The unit is only to be used in a
closed water system. Application
in an open water circuit can lead to
excessive corrosion of the water
piping:
•
Never use Zn-coated parts in
the water circuit. Excessive
corrosion of these parts may
occur as copper piping is used
C
in the unit's internal water
circuit.
•
When using a 3-way valve in
the water circuit. Preferably
choose a ball type 3-way valve
to guarantee full separation
between the domestic hot water
and floor heating water circuit.
•
When using a 3-way valve or a
2-way valve in the water circuit.
The recommended maximum
changeover time of the valve
should be less than 60 seconds.
9.4.4
Water circuit anti-freeze
protection
All internal hydronic parts are insulated to reduce
heat loss. Insulation must also be added to the
field piping.
In event of a power failure, the above features
would not protect the unit from freezing.
The software contains special functions using the
heat pump and backup heater (if it is aviliable) to
protect the entire system against freezing. When
the temperature of the water flow in the system
drops to a certain temperature, the unit will heat
the water, either using the heat pump, the electric
68 / 276 EN
heating tap, or the backup heater. The freeze
protection function will turn off only when the
temperature increases to a certain valve.
Water may enter into the flow switch and
cannot be drained out and may freeze when
the temperature is low enough. The flow switch
should be removed and dried, then can be
reinstalled in the unit.
Note:
C
Counterclock wise rotation, remove
the flow switch. Drying the flow
switch completely.
Heat Pump Monobloc Inverter / User Manual
Keep dry
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