Assortment / System Description

Fan

Powered Box

Application examples

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An application with serial fan must transfer the fan state to the VAV controller

so that the VAV supplies only fresh air if the fan is also operating. This ensures

that no fresh air enters the room via the return air duct. The following image is

a diagram of the various locking and monitoring signals of a serial fan powered

box applications.

P Primary volume flow AirFlSu Supply air flow sensor

R Return air volume flow AirFlMx Mixed air flow sensor

F Fan volume flow TSu Supply air temperature sensor

AirFlSt Air flow state AirFlVavRe

VAV request signal to fan

FanSt Fan state AirFlHReq Request signal from heating

AirFlHldH Switch-off delay signal from

heating register to fan

Figure: Serial FPB application