In auto mode, the Y1, Y2, or Y3 signal is active when the current heating or cooling demand is higher than
the corresponding
Demand for fan speed [nr] (%)
configuration setting, as illustrated in
In manual mode, the Y1, Y2, and Y3 signals are independent of the current heating or cooling demand.
Instead, each fan speed signal is active when the corresponding fan speed is selected in the room unit or set
via communication, as illustrated in
.
Table 2-17 3-speed fan control configuration values and controller output types.
Output signal
Controller output configuration value
Controller output type
Y1
Fan speed 1
Digital
Y2
Fan speed 2
Digital
Y3
Fan speed 3
Digital
Table 2-18 3-speed fan control configuration settings.
Configuration setting
Fan mode applicability
Description
Fan control
Auto
Disabled:
Fan control in auto mode is disabled (default setting).
At cooling demand:
Fan control in auto mode is active at cooling demand.
At heating demand:
Fan control in auto mode is active at heating
demand.
At heating and cooling demand:
Fan control in auto mode is active at
both heating and cooling demand.
Number of fan speeds
Auto and manual
None:
Fan control in auto and manual mode is disabled.
1 speed:
Only the fan speed 1 signal is used.
In auto mode, this means that the controller outputs the fan speed 1 signal
instead of the fan speed 2 and 3 signals.
2 speeds:
Only the fan speed 1 and 2 signals are used.
In auto mode, this means that the controller outputs the fan speed 2 signal
instead of the fan speed 3 signal.
3 speeds:
All 3 fan speed signals are used (default setting).
Demand for fan speed 1 (%) Auto
The fan speed 1 signal is active when the current heating or cooling
demand is higher than this value and lower than the value set by the
Demand for fan speed 2 (%)
setting.
Demand for fan speed 2 (%) Auto
The fan speed 2 signal is active when the current heating or cooling
demand is higher than this value and lower than the value set by the
Demand for fan speed 3 (%)
setting.
Demand for fan speed 3 (%) Auto
The fan speed 3 signal is active when the current heating or cooling
demand is higher than this value.
Hysteresis for fan speed
decrease (%)
Auto
Specifies the hysteresis for when a decrease in fan speed occurs.
For example, if the
Demand for fan speed 2 (%)
setting is 60% and this
setting is 5%, the fan speed 2 signal is deactivated when the heating or
cooling demand decrease below 60-5 = 55%. At the same time, the fan
speed 1 signal is activated.
Fan speed at no demand
Auto
Stop:
The fan speed 1 signal is inactive when the heating or cooling
demand is lower than the value specified by the
Demand for fan speed 1
(%)
setting (default setting).
Fan speed 1:
The fan speed 1 signal is active also when the heating or
cooling demand is lower than the value specified by the
Demand for fan
speed 1 (%)
setting.
illustrates the 3-speed fan control behaviour in auto mode when no hysteresis for fan speed
decrease is applied, the fan speed 1, 2, and 3 signals are configured on digital outputs 3, 4, and 5, and the
Demand for fan speed [nr] (%)
settings are set to 20, 60, and 100, respectively.
34
Regio
Ardo
manual, Rev. D