The macro "RSA_AHUManSwitchNordic" provides a manual overrides signal for air handling units.

It can be used for 1 or 2 staged- and variable speed fans


It transforms three digital inputs into a manual override signal for the air handling plant strategy.

The output signals have the states:

ManSwCond

ManSwCond_MSt

0 = off

1 = off

1 = on-low

2 = on-low

2 = on-high

3 = on-high

3 = auto

4 = auto


"ManSwCond" can be connected to an analog value point but not to a multistate point, since multistate points do not support the value "0".

The signal "ManSwCond_MSt" can be connected to a multi-state point with the states: off; on-low; on-high and auto.


Connecting the output signal to the air handling unit plant strategy will override the fans to the following states:

Signal value

1 stage fans

2 stage fans

variable speed fans

off

off

off

off

on-low

fan on

fan ST1

fan minimum speed

on-high

fan on

fan ST2

fan maximum speed

auto

automatic from an

    • external (network) or BMS override
    • time schedule or calendar