Siemens RDF870KN Series Manual page 17

CO2 application (dual duct parallel connected fan)
Dual duct parallel connected fan fresh air unit or purifier with built-in PM2.5 filter
Basic parameter settings: APP = 3, DISP (CO
on/off fan or ECM fan
RDF870... unit can be set up as a CO
X1 to control the fan operation of a fresh air unit (i.e. dual duct parallel connected fan fresh
air unit with/without PM2.5 built-in filter).
The fan speeds are switched as per the actual CO
The built-in PM2.5 filter already purifies the outside air before entering indoors.
This fresh air unit operates in similar way as per single duct type. With the dual duct type, air
exchange performance is better.
If fans must be connected in parallel, connect one fan directly, for additional fans, one relay
for each speed.
Siemens
Smart Infrastructure
CAUTION
= 1), SEN1 =4, FAN =1-/3-/4-speed
2
controller with an external CO
2
value and the CO
2
sensor connected to
2
setpoint.
2
17
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2021-03-31