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Retrotec DM-2A Manuel d'utilisateur Page 55

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©Retrotec Inc. 2012
Appendix A: System Flow Equations for all Devices
The following equation can be used to determine flow, using the variables listed in the table below.
Each fan has a different flow equation, incorporating N and K values related directly to that particular
fan.

  
  
where: FP is the fan pressure, and CR is the corrected room pressure
Note: CR can be determined by subtracting bias pressure from room pressure, by using the “Baseline”
feature on the DM-2, or by retrieving corrected pressure from FanTestic.
To determine the fan flow for a particular fan pressure, insert the values for FP, CR, and the N and K
values (based on the type of fan and its Range Plate/Range being used).
The Fan Pressure (FP or "PrB" reading on the DM-2) must be greater than the minimum Fan Pressure,
“MF” in the Table 8, and greater than (PrA*K2)
Table 8. N and K coefficients for all DM-2 supported fans.
Range
N
K
K1
K2
K3
MF
DU220
Open
0.5115
30.7774
0.000
0.2
0.0000
10
Mid
0.5415
5.9146
0.000
0.5
0.0000
25
Low
0.6125
1.0056
-0.024
0.5
-0.0002
25
Retrotec
1000 / 2000 /
3000 /
3000SR
Open
0.5214
519.6
-0.070
0.8
-0.1150
8.6
A
0.5030
265.0
-0.075
1.0
0.0000
12
B
0.5000
174.8824
0.000
0.3
0.0000
10
C8
0.5000
78.5000
-0.020
0.5
0.0160
10
C6
0.5050
61.3000
0.054
0.5
0.0040
10
C4
0.5140
39.3000
0.080
0.5
0.0005
10
C2
0.5500
20.0000
0.139
0.5
-0.0027
10
C1
0.5410
11.9239
0.122
0.4
0.0000
10
L4
0.4800
4.0995
0.003
1.0
0.0004
10
L2
0.5020
2.0678
0.000
0.5
0.0001
10
L1
0.4925
1.1614
0.100
0.5
0.0001
10
Mn
DuctBlaster
Open
0.5032
108.7000
0.000
1.0
0.0000
25
Ring 1
0.5038
40.5000
0.000
1.0
0.0000
25
Ring 2
0.5064
15.2700
0.000
1.0
0.0000
25
Ring 3
0.5140
5.8400
0.000
1.0
0.0000
4
Mn Model 3
110 V
Open
0.4879
506.8000
0.000
1.0
0.0000
25
A
0.4876
190.1000
0.000
1.0
0.0000
25
B
0.4955
60.6700
0.000
1.0
0.0000
25
C
0.5132
21.3700
0.000
1.0
0.0000
15
D
0.4942
7.2160
0.000
1.0
0.0000
15
E
0.5267
2.7260
0.000
1.0
0.0000
15
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