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City Multi VRF Systems
BC Controller
Branch Circuit Controller (BC Controller) is the technological heart of the CITY MULTI R2–Series. It works in unison with the outdoor unit to provide simultaneous cooling and heating, something no other two–pipe system can do.
The maximum piping length from the central BC controller to indoor units 90 m, providing flexibility in piping design. Sub-BC controllers should be used when piping length is 60 m or more.
The main BC controller is available in three outdoor unit capacity types: J Type (~40kW), JA Type (~101 kW) and KA Type (~124 kW).
For larger systems that require the use of Sub BC Controllers.
Main and sub-BC controllers are 246 mm high allowing installation in ceilings with limited space. Servicing space is required.
For systems with up to 40 kW nominal cooling capacity that require only one BC Controller (J Type).
The Main BC can connect to up to 11 sub-BC controllers, allowing for more flexibility in system design. The line-branching method enables the creation of system designs that use less refrigerant.
The BC Controller houses a liquid/gas separator, allowing the outdoor unit to deliver a mixture (2-phase) of hot gas for heating and liquid for cooling, all through the same pipe. When this mixture arrives at the BC Controller, it is separated and the correct phase delivered to each indoor unit depending on the individual requirement of either heating or cooling.