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Siemens Building Technologies Electronic Air / Fuel Ratio Control System CC1P7873.1en
HVAC Products 17 Engineering notes 15.10.2002
17.4 Requirements placed on the variable speed
drive and the fan speed feedback signal
The variable speed drive controls the amount of combustion air via the fan speed.
Based on the feedback signal received, the RVW26... controls the fan speed.
To ensure constant and steady combustion, accurate fan variable speed drive is very
important.
To provide control, the variable speed drive must have the following inputs:
· Analog input DC 0...10 V
· Start / stop
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