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5
GENERAL
Only qualified installers may carry out the
installation. The installer must follow
applicable rules and regulations and
recommendations from the manufacturer.
5.1
TRANSPORT AND STORAGE
The heat pump should always be transported and stored
in an upright position. However, the heat pump may be
tilted temporarily, but must not be laid down on its back
or sides.
5.2
SETTING UP
• The heat pump must be installed outside the building
on a level, hard standing area.
• The installer should take the sound level of the heat
pump into consideration when siting
(
chapter 15.3).
• The hdwu must be installed inside the property.
Pipework between the heat pump and the internal
unit should be kept as short as possible. All pipe work
between the outdoor and indoor unit must be well
insulated using class 0 insulation or better.
• Condensate drain water from the heat pump should
be led to a suitable drain area and the pipe work
insulated using class O insulation.
The pipe work must fall and terminate above the
drain.
• The drain pipe can also be routed into a foul water
drain outside.
• The heat pump must be installed with the specified
clearances for airflow.
• The heat pump must not be positioned so that the
recirculation of cold air can occur.
• Consideration should be given to siting the outdoor
unit directly below eaves and possible snow fall onto
the fan.
• Removing transport stay.
Fig. 2
Transport stay
6 720 641 467 (2010/01)
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5.3
MINIMUM AND MAXIMUM
OPERATING TEMPERATURES
Maximum operating return temperature: The heat
pump can operate with a maximum return temperature
of approx. 59 °C. For safety reasons the heat pump
stops as soon as this temperature is exceeded.
Maximum operating temperature heat only: The
maximum operating flow temperature is factory set to
62 °C. This can be changed by the installer to a
maximum of 70 °C. It is recommend that the factory
supplied blending valve be fitted in line with G3
regulations.
Minimum operating temperature: The heat pump stops
when the outside temperature is below - 20 °C. Only the
internal unit will then generate heat. The heat pump
restarts automatically when the outside temperature
rises again.
5.4
WEATHER COMPENSATION
CONTROL
The control unit regulates heat generation for the
heating either exclusively via the outside temperature
sensor (weather-compensated control) or via a
combination of outside temperature sensor and room
temperature sensor (room temperature-dependent
control).
For more detailed information regarding the control unit,
see the heat pump operating instructions.
5.5
DEFROSTING METHOD
The principle of defrosting in the heat pump is known as
hot gas defrosting. During defrosting, the flow in the
refrigerant circuit is reversed by means of an electrically-
controlled four-way valve.
The hot gas melts the ice on the evaporator fins. As this
happens, the heating water cools down a little. The
defrost duration depends on the thickness of the ice and
the current outside temperature. This process is
controlled by the T2, T11 and T12 temperature sensors.
An additional function enables defrosting of the fan.
Warm air is drawn through the fan and thereby prevents
it from freezing up again.
6 720 616 817-26.1I
GENERAL
7
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