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ABB i-bus KNX
3.2.3.5
HVAC system –
2 Control value/4-pipe
© 2010 ABB STOTZ-KONTAKT GmbH
Commissioning
If option 2 Control values/4-pipe is selected, additional parameters appear:
Toggle via automatically
This parameter serves as a note or remark.
Valve HEATING/Valve COOLING
The HEATING valve is controlled via the communication object
Control value HEATING.
The COOLING valve is controlled via the communication object
Control value COOLING.
Toggling between HEATING and COOLING is implemented by
updating the control values. The HEATING/COOLING status is then
set accordingly.
Note
The switchover between HEATING/COOLING should occur
exclusively in the respective thermostat. Here only HEATING or
COOLING is always active depending on the last control value
received.
- If a control with a value > 0 is received, the fan and the
corresponding valve are controlled.
- The other valve is closed.
- If a control value with a value = 0 is received, this is ignored if the
other control value > 0.
For further information see:
page 124
Operation HEAT/COOL after
bus voltage recovery
Options:
unchanged
HEATING
COOLING
Using this parameter the reaction after bus voltage recovery is set.
unchanged: After bus voltage recovery the state which existed before
bus voltage failure is set.
HEATING: After bus voltage recovery the HEATING state is set.
COOLING: After bus voltage recovery the COOLING state is set.
Design of a HVAC system with Fan Coil
Units,
34
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