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ABB i-bus KNX
4.1.5.3
2-pipe system
HEATING or COOLING
© 2010 ABB STOTZ-KONTAKT GmbH
Planning and application
In this system one heat exchanger is available for HEATING or COOLING.
The control value for HEATING or COOLING is provided by a thermostat.
Only warm or only cold water is supplied centrally to the pipe system (2 pipes).
Depending on this setting one control value acts on one valve. The thermostat
sends the control value (COOLING) and the FCA/S controls the fan speed and
the valve.
Note
Both 2-pipe systems can be established using a 3 speed fan or blower.
Depending on the control value (1 byte or 1 bit) which is sent from
a thermostat, the Fan Coil Actuator determines the corresponding fan
speeds via programmable threshold values.
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