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ABB i-bus
®
KNX
Planning and application
© 2008 ABB STOTZ-KONTAKT GmbH
240
4.4.5.2
2 pipe system
HEATING and
COOLING
In this system only one heat exchanger is available for HEATING and
COOLING. Depending on the weather, warm or cold water is supplied
centrally to the pipe system (2 pipes). The Room Master or the thermostat
is informed if warm or cold water is currently flowing through the system.
Depending on this setting both control values act on just a single valve.
The thermostat decides which control value (HEATING/COOLING) is
actively sent. The RM/S controls the fan speed and only one valve.