Ventilation Controller
With HVAC module, you can also control a ventilation. In addition to the control, you can set a fan step for manual mode in ongoing operation and change between automatic and manual mode. In automatic mode, the fan coil actuator takes over the control of the fan steps.
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HVAC controller Controller settings
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Description |
Max. 30 characters |
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Controller 1 |
Ventilation controller |
The setting of the ventilation parameters is almost identical to the fan setting in the room temperature control section. See more in Ventilation System and FCU Fan Function.
You can set up automatic fan speed control via 1-bit Fan automatic operation object. You set the message value for activating the automatic control (“1” or “0”).
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Ventilation controller |
Auto. operation on object value |
Auto = 1/Man. = 0 Auto = 0/Man. = 1 |
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State of Auto. operation after startup |
Disable/Enable |
You can select the source of the (PM2.5,CO2 or VOC).
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Ventilation controller |
Control value reference from |
PM2,5 CO2 VOC |
The control values are obtained from the bus. The fan turns off by default when an error occurs in the control value.
Threshold evaluation algorithm:
Control value = CO2 / PM2,5 / VOC
Control value < Threshold value OFF → Fan off
Control value ≥ Threshold value OFF → Low speed
Control value ≥ Threshold value low → Medium speed
Control value ≥ Threshold value medium → High speed
Example:
Control value = CO2
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Parameter |
Setting |
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Hysteresis value is threshold value in |
+/– 100 |
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Threshold value |
450 |
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Upper threshold |
450 + 100 = 550 |
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Lower threshold |
450 – 100 = 350 |
If the control value is between 350 and 550 → no change
Control value ≥ 550 / < 350 → previous / next speed
The Minimum time in fan speed setting represents the time interval after which it is possible to switch to the next/previous speed. The mode changes after time elapses.
If you set “0 s”, there is no minimum run time.