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The regulation logic is as follows:
100
0
Temp.
PBH
(
I22
)
Outputs
BHS
(
I07
)
AO1
ECM speed 1
% opening valve
Fan
ECM speed 3
(
I31
)
0%
100%
HH
(
I18
)
DIFF
(
I20
)
DO1
AO2
If the operating temperature drops below
I07
,
the valve starts opening (output
AO1
). Icon
turns on.
The valve can be regulated with PI action if the
integral time
I24
is non-zero or with only propor-
tional action if
I24
=0.
The fan (output
AO2
) starts when the valve
reaches the minimum aperture given by param-
eter
I31
, and after the fan start delay
I36
has
expired.
The speed increases linearly as the valve opens.
Speed 3 is reached when the valve is fully open
(see
“EC motor automatic speed control logic
with 0..10 V modulating outputs” page 28
).
If the temperature drops below
I07
-
I20
-
I18
,
the electric resistance output (
DO1
) is activated
and icon
turns on .
If the temperature returns above
I07
-
I20
, the
electric resistance output is deactivated and
icon
turns off.
A timer now starts (parameter
I35
) during which
the fan cannot be turned off even if the setpoint
is reached. Once delay
I35
has expired, the fan can be turned off if necessary.
When the electric resistance turns on, the fan turns on immediately regardless of the ventilation delay set in parameter
I36
and the position of the minimum thermostat (if in use).
Icon turns off when the valve closes again, in which case the fan stops if
I28
=0 or 2. The fan maintains speed 1 if
I28
=1 or 3.
The fan maintains speed selected manually if
I28
=4 or 6.
N.B.: if the minimum thermostat function is active, the thermostat itself must be closed when the valve is in regulation,
otherwise the fan will not start. If, on the other hand, the electric resistance turns on, the fan starts immediately regardless
of the position of the minimum thermostat.
Cooling regulation is controlled as follows for 2 pipe heating/cooling mode (
M01
=5, 6, 7):
In half seasons, when cooling is still active, certain days may be colder than others. While keep cooling mode active, you
can enable an electric resistance to heat the room when its temperature is too low.
To enable this function, set
M15
=1.
To disable it, set
M15
=0.
- Operation without half season function (
M15
=0):
The “
COOL
” icon is on to indicate cooling mode.
The regulation logic is as follows:
Temp.
ECM speed 1
% opening valve
Fan
ECM speed 3
100
0
BCS
(
I08
)
PBC
(
I23
)
(
I31
)
0%
100%
Output valve
AO1
AO2
If the operating temperature rises above
I08
the
valve starts opening (output
AO1
). Icon turns
on.
The valve can be regulated with PI action if the
integral time
I24
is non-zero or with only propor-
tional action if
I24
=0.
The fan (output
AO2
) starts when the valve
reaches the minimum aperture given by param-
eter
I31
, and after the fan start delay
I36
has
expired.
The speed increases linearly as the valve opens.
Speed 3 is reached when the valve is fully open
(see
“EC motor automatic speed control logic
with 0..10 V modulating outputs” page 28
).
Icon turns off when the valve closes again, in
which case the fan stops if
I28
=0 or 3. The fan
maintains speed 1 if
I28
=1 or 2.
The fan maintains speed selected manually if
I28
=4 or 5.
