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ABB i-bus KNX
3.2.3.4
HVAC-System –
2 Control value/2-pipe,
with switching object
© 2010 ABB STOTZ-KONTAKT GmbH
Commissioning
If option 2 Control values/2-pipe, with switching object is selected,
additional parameters appear:
Toggle via separate object
Valve COOLING not usable
This parameter serves as a note or remark.
Valve HEATING/Valve COOLING
The valve is controlled via the communication object Control value
HEATING.
Toggle between HEATING and COOLING is implemented via the
communication object Toggle HEATING/COOLING.
Caution
With a 2-pipe HVAC system both the Control value HEATING as
well as the Control value COOLING act on the HEATING valve
(electronic outputs O, P). Please note that always the last control
value received and the switching object control the HEATING
valve.
For 2-pipe systems only the communication objects for the
HEATING valve are relevant.
The communication objects in conjunction with the COOLING
valve, e.g. status, forced operation or valve purge are not effective.
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,
32
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