Note!        This chapter is only valid for Access 4.5-1-01 and later revisions


The fan compensation sequences normally starts in the standard order, meaning that the higher start priority number it has - the later it will be activated.

Under special conditions the fan compensation sequences are required to start despite their priority number. This is achieved by enabling the jump to fan compensation sequences.


Once the jump function is enabled, the fan compensation sequence is activated while all of the following conditions are met:

  • Room/extract cascade (outdoor compensated) setpoint is not reached.
  • "Actual setpoint supply air" is within the minimum and maximum range.
  • The first two conditions have been present for the set time (default 10 min).


While jump function is active - the starting order of the fan compensation sequences is determined by their position in the sequence list (SEQ-A has highest priority... SEQ-J has the lowest priority).


e.g.:

Position

Heating

Cooling

Start Heating

Start Cooling

Name


SEQ-A

9

Off

0%

0%

Heating 3 (El. heater)


SEQ-B

1

1

0%

0%

Exchanger


SEQ-C

4

Off

0%

0%

Heating 1 (Run-around)


SEQ-D

2

2

0%

0%

Recirculation 1


SEQ-E

3

3

0%

0%

Recirculation 2


SEQ-F

6

5

0%

0%

Fan compensation 1

 Will start 1st

SEQ-G

5

Off

0%

0%

Heating 2 (DX or water)


SEQ-H

Off

4

0%

0%

Cooling 2 (DX or water)


SEQ-I

7

6

0%

0%

Fan compensation 2

 Will start 2nd

SEQ-J

8

7

0%

0%

Fan compensation 3

 Will start 3rd



Configuration of jump to fan compensation sequences



Variable

Available options & Selection

Note


Enabling jump to sequences

Configuration > Functions > Function activation

Run fan setpoint comp. to increase cool/heat capacity at min/max supply air setpoint

| Yes | No |



Operational settings

Data & Settings > Temperature control > Supply air controller

Min limit supply air

[12.0] oC

Conditions to engage jump to sequences:


12-1 oC < Supply air temperature

30+1 oC > Supply air temperature


is longer than 10 minutes

Max limit supply air

[30.0] oC

Room/Extract air min setpoint deviation to run fan setpoint comp.

[1] oC

Start delay fan setpoint compensation

[10] min


Chapter info                              

Last reviewed: 11/29/2021

Access version: 4.6-0-14 (3045)