This type of sequence allows compensation of the actual fan setpoint in relation to the heating/cooling demand. The actual fan setpoints can either be decreased or increased.

The extent of the compensation is linear from "0" to "Max fan compensation". The compensation follows the output of the sequence and "Max fan compensation" is reached once output of the sequence is 100%.


The variable "Max fan compensation" has no units, meaning that default value of [100] will have different effect in different fan control types.

e.g.:

Fan control type: Pressure. Maximum fan compensation of [100] would add to the actual fan setpoints -100Pa (for decreasing compensation) or +100Pa (for increasing compensation).

Fan control type: Flow. Maximum fan compensation of [100] would add to the actual fan setpoints -100m3/h (for decreasing compensation) or +100m3/h (for increasing compensation).

Fan control type: Manual. Maximum fan compensation of [100] would add to the actual fan setpoints -100% (for decreasing compensation) or +100% (for increasing compensation).


Fan setpoint compensation




Variable

Available options & Selection

Note


Sequence selection

Configuration > Functions > Function activation > Heating/Cooling sequence setup

Sequence for heating

|...| SEQ-F Fan setpoint compensation |...|



Sequence settings

Configuration > Functions > Function activation > Heating/Cooling sequence setup > Fan setpoint compensation

Type of sequence

|Cooling | Exchanger | Heating | Damper | | Fan setpoint compensation |


Type of setpoint compensation

| Decreasing | Increasing |

Decreasing - the fan setpoint is reduced once sequence is active

Increasing - the fan setpoint is increased once sequence is active

Digital start output

| No | Yes |


Sequence output when recirculation/support

| 0% | 100% | Auto |


Sequence output min limit

0%


Sequence output max limit

100%


Sequence output when the unit is stopped

0%



PID Settings

Configuration > PID controllers > Fan setpoint compensation

P-band

[10] oC

PID settings for the sequence

I-time

[100] s

D-time

[0] s


Compensation limit

Data & Settings > Temperature control > Fan setpoint compensation

Max fan compensation

[100]

The decrease/increase in the units the fan setpoint (Pa | m3/h | % )


Overview

Data & Settings > Operation overview > Fans

Actual setpoint compensation (supply air fan)

__ (Pa | m3/h | %)

Actual compensation

Actual setpoint compensation (extract air fan)

__ (Pa | m3/h | %)


Chapter info                              

Last reviewed: 11/29/2021

Access version: 4.6-0-14 (3045)