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3.24 OPERATING LOGIC
Central heating mode
Following a request during the room heating mode, the electronics decide, according to the external temperature, whether to activate the
outdoor unit, or (with cold temperatures) the indoor unit (Fig. 66).
The management electronics select which heat source to be used according to the combination of the parameters set in the integration
menu of the control panel. The indoor unit may activate when the external conditions are favourable to the operation of the outdoor unit;
this may happen after a time proportional to the "Heating waiting time" parameter.
Alternatively, a fixed outside switching temperature can be set (manual mode in parameter "Integration mode" by setting the tempera-
ture with "Manual activation temp."). The DHW demand is met by the indoor unit in priority mode over a possible space heating demand.
Y
Y2
A
55 °C
Y1
-14
106
B
X1
Key (Fig. 66):
X
- Outside temperature
X1
- Integration activation temperature
Y
- Central heating / C.H. set
Y1
- Minimum
Y2
- Maximum
A
- Exclusive operation of the indoor
unit
B
- Outdoor unit operation The system
logic calculates an elapsed activa-
tion time which also starts the indoor
unit according to the external tem-
perature
X
25
66
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