Air Handling seq.- user manual
DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2
Produced by Danfoss Electronics spa Graphic Department, 10-2009
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5.1.1| ON/OFF dampers
If dampers are of the ON/OFF type, they are controlled by the digital outputs “RDD - Mixing Damper” and “EDD
- External Damper”.
Since their operation is mutually antagonistic, opening one closes the other. Opening occurs when the demand is
for more than 50%. When both require 50%, the mixing damper opens.
Fig 16 _ [Dampers and Energy recovery control - ON/OFF dampers ]
5.1.2| 0/10V dampers
If dampers are of the modulating type, they are controlled by the analog outputs “RDA - Mixing Damper” and “EDA
- External Damper”.
Since their operation is mutually antagonistic, if the external damper is opened to 25%, the mixing damper will be
opened to 75%, as described in the following gure.
Fig 17 _ [Dampers and Energy recovery control - 0/10V dampers]
5.1.3| Damper locked
The external damper locked alarm A02 and mixing damper locked alarm A05 indicates that the digital input used to
monitor damper opening “CSE - ExtDamp Closed” and “CSR - MixDamp Closed signals that the damper is closed and,
at the same time, the damper control is active for at least 3 seconds.
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