DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2
Produced by Danfoss Electronics spa Graphic Department, 10-2009
32
Air Handling seq. - user manual
Fig 19_ [Temperature control sequences - Damper control sequences]
Through the oset D04 and D05 you can dene the modulation starting point of the damper in freecooling and in
freeheating respect to the freecooling and freeheating selected setpoint.
* In the previous gures are
displayed positive values of the
oset.
As described in the gure above, there are two possible way of working for the damper, freeheating and freecooling.
They are mutually exclusive.
6.1.1| Freecooling/Freeheating selection
The selection between freecooling or freeheating is obtained in the following ways.
Assign two probes for the comparison through the parameters D07 and D08.
If Probe(D07) <= Probe(D08) then freecooling
If Probe(D07) >= Probe(D08) + D09 then freeheating
If D07=DI, through digital input “FDI - FreeHeatCool”.
* If, during the input
conguration phase, you set
“Polarity = N.C”., freeheat is
selected when the input is open.
If D08=SET, then probe selected with D07 is compared to parameter D09.
If Probe(D07) <= D09 then freecooling
If Probe(D07) >= D09 + 2,0 then freeheating
6.1.2| Minimum opening
For granting a minimum amount of fresh air , it is possible to dene a minimum opening of the external damper
with D10.
1.
2.
3.
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