User Manual

Functions
Fan control
4
A6V11545892_en--_a 85 | 146
● The output for the 1
st
stage (YHC1) in heating mode is also the 1
st
stage in
cooling mode
● This function is available for DC/3-speed/1-speed fans
We recommend enabling the swap function on applications with fan coil system
and floor heating/cooling systems. In this application, the fan runs during cooling
demand (fan coil unit and floor cooling) and only in the 2
nd
heating stage (with the
fan coil unit).
Set P254 to ON or OFF, depending on the selected control signal (swap function),
and set P350 to 4 (fan in the 2
nd
stage).
The fan runs during heating demand and only in the 2
nd
cooling stage, e.g. for
applications with fan coil system and radiant heating/cooling panels.
This setting is available only when P350 is set to 5, and the swap function is
selected (P254 to ON or OFF).
Example 2:
P350=4
Example 3:
P350=5
Heating mode Cooling mode
● Swap function: The output for the 1
st
stage in heating mode is the 2
nd
stage in
cooling mode
● This function is available for DC/3-speed/1-speed fans
The following table shows for the 2-pipe / 2-stage applications the relation between
the fan behavior (switching range fan XpH
Fan
/XpC
Fan
according to look-up table or
proportional band XpH/XpC) depending on the selected output signals and on the
synchronization of the fan with the first or second sequence.
Combination
1
st
stage
signal
2
nd
stage
signal
Fan type Fan synchro Fan behavior
1 On/off On/off DC 1
st
sequence
XpH
Fan
/XpC
Fan
,
P-control
2 DC DC DC 1
st
sequence
XpH/XpC,
P/PI control
3 On/off On/off DC
2
nd
sequence
XpH
Fan
/XpC
Fan
,
P-control
4 DC DC DC
2
nd
sequence
XpH/XpC,
P/PI control
5 On/off DC DC 1
st
sequence
XpH
Fan
/XpC
Fan
,
P-control
Notes
Example 2
Example 3
Notes
Examples, other
combinations