ABB i-bus
®
KNX
Planning and application
© 2008 ABB STOTZ-KONTAKT GmbH
239
4.4.5.1
2 pipe system,
configuration
The 2 pipe system consists of just a single water circuit which is heated or
cooled alternately to suit the season. In a 2 pipe Fan Coil unit there is only
one heat exchanger with a valve.
Note
In some HVAC systems cooling is undertaken exclusively with a 2 pipe
Fan Coil unit. The heating function is undertaken by a conventional heater
or an electrical heater.