6
Control functions
6.1
Supply air temperature limit
The intention of the supply air temperature limit is to reduce the draft when supply air that is
fairly cold is blown in. The temperature range within which the supply air temperature may
vary is determined by the parameters
Supply air temperature minimum limit and Supply air
temperature maximum limit. If the supply air temperature is the control variable, i.e. for sup-
ply air temperature control or exhaust air or room temperature cascade controI, the control-
ler only permits set point shifts within this range.
If F1 or AE1 is just used as a limit input, i.e. for exhaust air or room temperature control, this
deviation is included in the control when the supply air temperature exceeds or fall below the
limit values, to counter any further drifting of the supply air temperature.
Functions
WE
Configuration
Sensor F1, supply air temperature
or
assignment of inputs AE1 to AE4
OFF
Fb1 = ON
Fb18 = ON,
option:
AE1F1
Parameters
WE
Range of values
Supply air temperature minimum limit
18 °C
0 °C up to supply air temp. maximum limit
Supply air temperature maximum limit
26 °C
Supply air temp. minimum limit up to 50 °C
6.2
Supply air humidity limit
For exhaust air or room humidity control, the parameters
Supply air humidity minimum limit
and
Supply air humidity maximum limit restrict the humidity range within which the supply
air humidity may vary. If it leaves this range, the deviation is included in the system deviation
to prevent any further drifting of the supply air humidity.
The main purpose of the supply air humidity maximum limit is to prevent condensation form-
ing in the supply air duct.
Functions
WE
Configuration
Sensor F6, supply air humidity
or
assignment of outputs AE1 to AE4
OFF
Fb6 = ON
Fb18 = ON,
option:
AE2F6
Parameters
WE
Range of values
Supply air humidity minimum limit
40 %rH
0 %rH up to supply air humidity max. limit
Supply air humidity maximum limit
60 %rH
Supply air humidity max. limit up to 100 %rH
EB 5477 EN
53
Control functions