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17. Fancoil with 3 speed on-off motor (models TH-2xxSx1, TH-3xxSx1,
TH-4xxSx1)
Parameter
M13
=1.
The device can control 3 speed on-off fancoils. Parameter
M14
is not considered in this case.
• 3 speed on-off motor speed control logic with on/off outputs
Depending on the value of the stage 1 differential, a fan temperature band (FB) is set, within which the fancoil speed can
vary from speeds 1 to 3.
Hysteresis
0.5 - 1.0 °C
> 1.0...1.5 °C
> 1.5...2.0 °C
FB
2.0 °C
3.0 °C
4.0 °C
speed 1
Fan
speed 3
BHS
(
I07
)
speed 2
(
I26
)
(
I27
)
ON
OFF
Temp.
HH
(
I18
)
Output
Temp.
FB
The graph refers to heating mode operation.
Set the 3 speed on-off motor parameters as follows:
- Set parameters
I26
,
I27
to define the activation points of
speeds 2 and 3 within the fan band.
Example: if Stage 1 hysteresis=0.5°C, FB=2°C and
I26
=50%,
I27
=100%, then speed 2 starts at 0.75°C → [
I26
x (FB - hys
-
teresis)] below the activation point of speed 1 and speed 3
starts 1.5°C → [
I27
x (FB - hysteresis)] below the activation
point of speed 1.
The hysteresis of speeds 2 and 3 corresponds to 20% of the
FB band.
The activation/deactivation of speed 1 correspond to the ac-
tivation/deactivation of stage 1.
N.B.: parameters
I25
,
I29
and
I34
are not used in this ap-
plication.
• 3 speed on-off motor speed control logic with 0...10V modulating outputs
We take the example of control in heating mode.
speed 1
% opening
valve
Fan
speed 3
(
I25
)
0%
100%
BHS
(
I07
)
speed 2
(
I26
)
(
I27
)
Set the 3 speed on-off motor parameters as follows:
- Set parameters
I25
,
I26
and
I27
to define the activation points of speeds 1, 2 and 3 in relation to the valve opening.
Example: with
I25
=5%,
I26
=50%,
I27
=100%
speed 1 starts when the valve is at ≥ 5% of its total aperture.
speed 2 starts when the valve is at ≥ 50% of its total aperture.
speed 3 starts when the valve is at ≥ 100% of its total aperture.
Speed 1 is deactivated when the valve is closed.
The hysteresis of speeds 2 and 3 corresponds to 20% of the respective activation point.
In the above example:
