37
English
AGLLI10/20NFJ 07/11_4528572_00
ADDITIONAL CONTROLS
EMERGENCY FUNCTIONING
The ventilation in this case is always
performed according to the ON-OFF
cycles, however, increasing the ON
phase from the central position. In
this way the maximum ventilation can
be required with the selector at the
minimum position for cooling opera-
tion season and likewise there is maxi-
mum ventilation with the selector in
the maximum position. For the heating
operation season. The total duration of
the ON-OFF cycle is again 5’20’’. The
following table gives duration exam-
ples of various ON and OFF cycles
based on the position of the tempera-
ture selector:
The two following failure cases are fore-
seen when the thermostat operates in
the described manner.
NO WATER PROBE
- Ventilation is always active
- The season change is made on the
basis of the difference between the set-
ting made and the actual ambient tem-
perature. If the ambient temperature
exceeds by a value equal to the dead
band, the Heating setpoint switches to
the Cooling mode. If the ambient tem-
perature drops by a value equal to the
dead band below the Cooling setpoint,
it switches to the Heating mode.
- The turning on/off of the resistance
does not depend in this case on the
temperature of the water but on the
sheer demand for the thermostat opera-
tion
AMBIENT PROBE ABSENT (2 PIPES)
In this case the thermostat operates as
follows:
- OFF - Aux Mode
The valve is closed
The fan is off
- AUTO, V1, V2, V3 mode:
The valve is always open.
Operating season always hot.
- The ventilation runs On-Off cycles.
The duration of the ON cycle is pro-
portional to the setpoint set in the
VMF-E4 panel. The total duration of
the ON-OFF cycle corresponds to
5’20’’. The following table gives dura-
tion examples of various ON and OFF
cycles based on the position of the
temperature selector:
AMBIENT PROBE ABSENT (4 PIPES)
In this case the thermostat operates as
follows:
- OFF - Aux Mode
The valves are closed
The fan is off
- AUTO, V1, V2, V3 mode:
The operating season is decided
according to the position of the tem-
perature selector and it is activated by
the respective valve as shown in the
Figure
SetPoint
ON cycle
duration
OFF cycle
duration
Min value
Nil
'20"
20 C°
2'20"
2'60"
Max value
'20"
Nil
Position
ON cycle
duration
OFF cycle
duration
Min value
'20"
Nil
20 C°
Nil
'20"
Max value
'20"
Nil
VENTILATION CYCLES OF 2-PIPE SYSTEM WITHOUT AMBIENT PROBE
VENTILATION CYCLE OF THE 4-PIPE SYSTEM WITHOUT AMBIENT PROBE
Keys used to
modify the
setpoint value
Cold water valve opening, ventilation
period proportional to the deviation
of the median position
Hot water valve opening, ventilation
period proportional to the deviation
of the median position
Minimum value
Maximum value
SETPOINT