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Sample Diamond Flow Sensor Calibration Label
1.0
.90
.80
.70
.60
.50
.40
.30
.20
.15
.10
.09
.08
.07
.06
.05
.04
.03
.02
30
40
50
60
80
100
150
Airflow Direction (affixed to inlet collar)
LOW (BAS)
HIGH (HAUT)
AIR FLOW (ECOULEMENT DE L'AIR)
MCA and MOP Calculations
If the calculated MOP does not equal the standard current rating of an Overcurrent protective device (typically even multiples of 5),
then the marked MOP is the next lower standard rating.
Exceptions:
1. The marked MOP will be the next higher standard rating than the computed value, if the next lower standard rating is less than 125
percent of the current rating of an electric heater load when such heater is involved.
2. If the computed value for MOP is less than the MCA, then the marked MOP is increased to the largest MOP appropriate for the
MCA.
3. If the MCA does not correspond to a standard protective device rating, the next higher standard rating of the protective device will
be marked if this rating does not exceed 800 A.
For Nailor Fan Powered Terminal Units and Fan Powered Terminal Units, Load 1 is the largest motor current, Load 2 is the sum
of all other motor currents, and Load 3 is the heater current. Load 4 is used for other loads greater than 1.0 ampere and can be
considered zero for most standard products.
For Nailor Variable Air Volume Units, Load 1 and Load 2 are considered zero.
Load 3 is the heater current Load 4 is used for other loads greater than 1.0 ampere and can be considered zero for most standard
products.
(Motor currents are determined by product application test in accordance with UL 1995 and may not be the same as the motor
manufacture's FLA marking.)
All formulae, definitions, and exceptions are cited from Underwriters Laboratories Inc. Standard for Safety for Heating and Cooling Equipment, UL
1995 Fifth Edition (Sec. 44.14.44.15) CAN/CSA-C22.2 No. 236 Fifth Edition
Table 1.
Page 4 of 10
Nailor Industries, Inc. reserves the right to change any information concerning product or specification without notice or obligation.
DIAMOND FLOW SENSOR
FIELD CALIBRATION CHART
MODEL SERIES: 3100, 3230, 3240, 33SZ, 35N, 35S,
35SST, 36VRR, 37N, 37S & 37SST
ALLOWABLE PNEUMATIC LO
SETTING MIN. ∆P = O.O3" W.G.
200
300 400
500
700
1000
1500
CFM
Minimum Circuit Ampacity
MCA = 1.25 x (Load 1 + Load 2 + Load 3 + Load 4)
Maximum Overcurrent Protection
MOP = (2.25 x load 1) + load 2 + load 3 + load 4
Application Charts for ECM Motors
DFSCC-2
11-2022
FAN POWERED TERMINAL UNIT
MODEL SERIES: 35S & 35SST • UNIT SIZE 3 • 120/208/230/277 VAC
CFM
138
146
155
163
171
179
188
196
204
213
Inlet
221
K-Factor
Size
229
4 Round
182
238
5 Round
325
246
6 Round
455
254
7 Round
657
8 Round
899
263
9 Round
1158
271
10 Round
1497
280
12 Round
2048
14 Round
2742
288
16 Round
3683
297
14 x 8 Rect. 2035
305
14 x 10 Rect. 2417
314
18 Oval
4323
322
CFM = K x ∆P
331
340
349
357
366
375
384
2000
3000
5000
393
402
411
420
THIS UNIT HAS BEEN FACTORY SET AT ____________ CFM.
RE-CALIBRATION IS NOT REQUIRED UNLESS THE ZONE DESIGN AIRFLOW REQUIRMENT HAS CHANGED. THE BOLD LINES INDICATE MIN AND
MAX CFM FOR THE UNIT. VARIATIONS IN FLOW IS IN +/- 5% or +/- 30 CFM WHICHEVER IS GREATER EXCEPT IN GRAY AREA. DATA
REPRESENTED IN THIS CHART IS AT STANDARD CONDITIONS OF TEMPERATURE, PRESSURE AND HUMIDITY I.E. SCFM. FAN TURNS OFF
BELOW 0.50Vdc.
www.nailor.com
Digital Control Algorithm:
CFM = 0.027717307(VDC)5 ‐0.61146699(VDC)4 +4.155391639(VDC)3 ‐8.60626115(VDC)2 + 124.7107364(VDC) + 77.19940471
VDC = ‐1.2214E‐14(CFM)5 +3.95345E‐11(CFM)4 ‐4.43622E‐08(CFM)3 +2.07462E‐05(CFM)2 +4.104313E‐03(CFM) ‐0.340841705E+00
ECM MOTOR FAN CALIBRATION TABLE
CFM vs VDC (Imperial Units)
0-10
0-10
0-10
CFM
CFM
VDC
VDC
VDC
REF.
REF.
REF.
0.50
429
2.89
747
5.29
0.57
438
2.96
756
5.36
0.64
448
3.03
765
5.43
0.71
457
3.10
774
5.50
0.78
466
3.17
783
5.57
0.85
475
3.24
791
5.64
0.92
485
3.31
800
5.71
0.99
494
3.39
809
5.78
1.06
503
3.46
818
5.85
1.13
513
3.53
826
5.92
1.20
522
3.60
835
5.99
1.27
531
3.67
843
6.06
1.34
541
3.74
852
6.13
1.41
550
3.81
860
6.20
1.49
560
3.88
869
6.27
1.56
569
3.95
877
6.34
1.63
579
4.02
885
6.41
1.70
588
4.09
893
6.48
1.77
598
4.16
901
6.55
1.84
607
4.23
909
6.62
1.91
616
4.30
917
6.69
1.98
626
4.37
925
6.76
2.05
635
4.44
933
6.83
2.12
645
4.51
941
6.90
2.19
654
4.58
949
6.97
2.26
663
4.65
956
7.04
2.33
673
4.72
964
7.11
2.40
682
4.79
971
7.19
2.47
691
4.86
979
7.26
2.54
701
4.93
986
7.33
2.61
710
5.00
994
7.40
2.68
719
5.07
1001
7.47
2.75
728
5.14
1008
7.54
2.82
737
5.21
1016
7.61
7-6-23
2/26/23
0-10
CFM
VDC
REF.
1023
7.68
1030
7.75
1037
7.82
1044
7.89
1051
7.96
1058
8.03
1065
8.10
1072
8.17
1079
8.24
1086
8.31
1093
8.38
1100
8.45
1108
8.52
1115
8.59
1122
8.66
1129
8.73
1136
8.80
1143
8.87
1151
8.94
1158
9.01
1166
9.09
1173
9.16
1181
9.23
1189
9.30
1197
9.37
1205
9.44
1213
9.51
1222
9.58
1230
9.65
1239
9.72
1248
9.79
1257
9.86
1266
9.93
1276
10.00
SUBJECT TO CHANGE WITHOUT NOTICE
IOM-FPTU
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