ABB i-bus
®
KNX
Planning and application
© 2008 ABB STOTZ-KONTAKT GmbH
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4.4.5.3
2 pipe system
HEATING or COOLING
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 (HEATING/COOLING) and the RM/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.