Daikin Modular T Smart ATB Installation, Use And Maintenance Manual page 42

Selection of the optimal ventilation speed
The fine adjustment of the fan speed can be done correctly by modifying the following parameters:
- Initial fan speed: High or Very High
- Supply fan speed step setting: Steps 1 to 15
- Return fan step setting: Steps 1 to 15
You can access the parameters in question by following the procedure "Service Settings Configuring 
on the field settings page, as illustrated in the List of settings paragraph.
Both supply fans and return fans have an optimal speed value, described in terms of RPM (number of revo-
lutions per minute), which can be found directly in the AED Unit Selection Software report, as shown below:
3) Fan supply
Model
Type
Material
Quantity
External static pressure
Internal static pressure
Total static pressure
Dynamic pressure
Project flow
K factor
Operating rotation speed • Max
Efficiency (Reg327/2011)
Efficiency
Absorbed electrical power
Power class • PMREF (EN13053)
SFPv class • SFPv (EN13053)
3) Fan return
Model
Type
Material
Quantity
External static pressure
Internal static pressure
Total static pressure
Dynamic pressure
Project flow
K factor
Operating rotation speed • Max
Efficiency (Reg327/2011)
Efficiency
Absorbed electrical power
Power class • PMREF (EN13053)
SFPv class • SFPv (EN13053)
Knowing the size of the unit, it is possible to proceed with the setting of the step relating to the
corresponding supply/return fan on the BRC controller, in compliance with the following speed selection
tables (we recommend you consider the rpm value for the "Heat return function").
In the absence of unit selection through the Daikin device software, check the performance for the indi-
vidual unit size from page 36 onwards.
42
Optimal RPM values for supply and return (exhaust) fans
GR281-61D.BD.CR_S
EC
Composite
1x (single fan)
100 Pa
330 Pa
430 Pa
17 Pa
2200 m /h
3
85
2621 RPM • 3110 RPM
67.8%
65.7%
0.49 kW
P1 • 0.82 kW
SFP1 • 731 W/(m
/s)
3
GR281-6ID.BD.CRS
EC
Composite
1x (single fan)
100 Pa
306 Pa
406 Pa
17 Pa
2200 m /h
3
85
2585 RPM • 3110 RPM
67.4%
65.3%
0.47 kW
P1 • 0.78 kW
SFP1 • 698 W/(m
/s)
3