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Controller operation
Heating / cooling mode
Heating / cooling mode is selected:
•
on the user interface by pressing the mode (M) button
•
through external contacts if code 106.4 is set to 0 (see
paragraph Input Related Functions)
The water temperature is determined according to the
outside air temperature, through a climatic curve that the
installer is free to set.
The room temperature setpoint is set by the user (see user
interface manual).
In heating / cooling modes, the system will also take care of
domestic hot water production (if combined with domestic
hot water tank).
Water frost protection is active.
Climatic curves
In heating / cooling modes, the water setpoint is
determined through climatic curves.
Code 112 for heating and code 119 for cooling allow
choosing between pre-set climatic curves or custom
climatic curves.
Pre-set climatic curves are shown in fig. 2 for heating and
fig. 3 for cooling.
Domestic Hot Water mode
Domestic Hot Water mode is selected on the user interface
by pressing the mode (M) button.
When this mode is selected, space heating / cooling is not
operating; the system is only taking care of meeting the
OFF mode
When OFF mode is selected, space heating / cooling and
domestic hot water heating are not performed.
Water frost protection is active.
Home antifreeze protection is active if enabled (code 1.0).
Domestic hot water function
Domestic hot water can be managed by the system control
or by an external contact (code 133 ).
Domestic hot water is managed by the system control when
the unit is combined with a domestic hot water tank listed
in paragraph Accessories.
In this case the system control manages domestic hot
water production on the base of domestic hot water
temperature to optimize overall comfort (see priority logic
below), activates booster heater if needed and performs
disinfection function.
Domestic hot water is managed by an external contact
when it is controlled by an ON/OFF contact (connected to
the domestic water input of the system control).
In this case overall comfort is not optimized, booster heater
is not activated and disinfection function is not performed.
In all cases, domestic hot water valve is managed by the
system control.
If custom curves are used, involved codes are shown in fig. 5
for heating and fig. 6 for cooling.
In fig. 5, 6, 7, 8:
A: Water Temperature
B: Outdoor temperature
If code 105.0 is set to 1 or 4 (see paragraph Zone Control
Settings), water setpoint calculated through climatic curves
is adjusted so that the room temperature matches the room
setpoint.
Backup Heaters (heating mode only)
If the outdoor temperature is lower than code 129 and if
the difference between the water setpoint and the water
temperature is higher than code 130 for more than code
131 minutes, backup heater 1 is turned on.
If electric heater activation conditions are still valid after
code 131 minutes since backup heater 1 activation, backup
heater 2 is turned on.
If the outdoor unit is not running because of failure, it is
possible to perform the heating duty through backup
heaters. See code 1.4 in the variable table.
domestic hot water duty.
Water frost protection is active.
Home antifreeze protection is active if enabled (code 1.0).
In case no domestic tank is connected, set code 133 to 3 and
code 106.1 to 0.
Domestic hot water production with outdoor unit or backup
boiler is based on priorities (fig. 9 and 10).
Fig. 9
A: Domestic hot water temperature
B: Domestic hot water priority
C: Domestic water setpoint
a: Normal domestic hot water priority line
b: Domestic hot water priority line in case of boiler backup
c: Domestic hot water priority line during disinfection cycle
in case of boiler backup
Fig. 10
A: Room temperature
B: Room priority
C: Room setpoint
80AWX- 80AWH
23
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