Dantherm DanX AF Series, User Manual

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4. COMMISSIONING
17
If the green LED is flashing the reason could be that the + and
– tube have been switched
when connecting to the pressure transducer. Please check this first. Another reason for the
green LED flashing can be that the pressure range setting is wrong. Change of setting can
be done with the potentiometer (SW2).
The DIP switches (SW1) are factory set as follows and should not been changed:
4.3.3 Air volume check
If you want to check the air volume of the unit with a differential pressure meter, the two
measuring probes (+/-), which are located beneath the pressure transducer, can be used.
The differential pressure, measured at these two points, compares the static pressure in
front of the inlet ring with the static pressure in the inlet ring of the narrowest point. The
differential pressure between the static pressures is related to the air volume via the energy
conservation rate as follows:
Where k takes into account the specific ring characteristics.
Model K nozzle coefficient Model K nozzle coefficient
DanX 3/6 154 DanX 12/24 (EC fans) 616
DanX 5/10 197 DanX 12/24 (AC fans) 490
DanX 5/10 (2 x 2.4 kW) 308 DanX 12/24 (AC fans) 490
DanX 7/14 308
DanX 7/14 (2 x 5.2 kW) 394
EXAMPLE: If you have measured a static pressure difference of 700 Pa for a DanX 5/10
then the air volume will be:
m 3 /h
Pressure range SW2
0..+500 Pa 0
0..+1000 Pa 1
0..+1600 Pa 2
0..+2000 Pa 3
0..+2500 Pa 4
0..+3000 Pa 5
0..+4000 Pa 6
0..+5000 Pa 7
DIP 1 DIP 2 DIP 3
OFF (0-10V signal) OFF (Damping 0,4s) OFF (No function)
Pw k V
 =
*
5212 700 * 197
= =
V