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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 proportional action if
I24
=0.
The fan (output
AO2
) starts when the valve reaches the
minimum aperture given by parameter
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 mo-
tor 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 manu-
ally if
I28
=4 or 5.
The electric resistance is always off in this application.
- Operation with half season function (
M15
=1):
The “
COOL
” icon is on to indicate that cooling mode is active.
The regulation logic is as follows:
A01
I27 = 100%
100
0
Temp.
PBC
(
I23
)
Outputs
HH
(
I18
)
DZ
(
I21
)
ECM speed 1
% opening
valve
Fan
ECM speed 3
(
I31
)
0%
100%
AO2
FB
(
I27
< 100%)
AO2
Temp.
DO1
BCS
(
I08
)
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 proportional action if
I24
=0.
The fan (output
AO2
) starts when the valve reaches the minimum aperture given by parameter
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 auto-
matic 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.
If the operating temperature drops below
I08
-
I21
-
I18
, relay
DO1
(electric resistance) is activated and the fan starts
immediately at speed 1 without considering the activation delay
I36
. The speed then increases as the operating tempera-
