Nailor Industries, Inc. reserves the right to change any information concerning product or specification without notice or obligation.
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
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
Page 4 of 10
7-6-23 IOM-FPTU
MCA and MOP Calculations
.40
.02
.03
.04
.05
.06
.07
.08
.09
.20
.50
.60
.70
.80
.90
1.0
.30
.10
.15
30
300 400
700 1000
1500
5000
3000
2000
80
60
50
40
200
100
150
500
CFM
DIAMOND FLOW SENSOR
FIELD CALIBRATION CHART
MODEL SERIES: 3100, 3230, 3240, 33SZ, 35N, 35S,
35SST, 36VRR, 37N, 37S & 37SST
DFSCC-2
11-2022
SENSOR
∆
P
(INCHES W
.G.)
SIZE 4 ROUND
SIZE 5 ROUNDSIZE 6 ROUNDSIZE 7 ROUNDSIZE 8 ROUND
SIZE 9 ROUND
SIZE 10 ROUND SIZE 14 x 10 RECT
.
SIZE 14 ROUND
SIZE 16 ROUND
SIZE 18 OV
AL
Inlet
K-Factor
Size
4 Round
182
5 Round
325
6 Round
455
7 Round
657
8 Round
899
9 Round
1158
10 Round
1497
12 Round
2048
14 Round
2742
16 Round
3683
14 x 8 Rect. 2035
14 x 10 Rect. 2417
18 Oval
4323
CFM = K x
∆
P
ALLOWABLE PNEUMATIC LO
SETTING MIN.
∆
P = O.O3" W.G.
SIZE 12 ROUND (14x8 RECT
.)
Sample Diamond Flow Sensor Calibration Label
ECM MOTOR FAN CALIBRATION TABLE
FAN POWERED TERMINAL UNIT
MODEL SERIES: 35S & 35SST • UNIT SIZE 3 • 120/208/230/277 VAC
2/26/23
0-10
0-10
0-10
0-10
VDC
VDC
VDC
VDC
REF.
REF.
REF.
REF.
138
0.50
429
2.89
747
5.29
1023
7.68
146
0.57
438
2.96
756
5.36
1030
7.75
155
0.64
448
3.03
765
5.43
1037
7.82
163
0.71
457
3.10
774
5.50
1044
7.89
171
0.78
466
3.17
783
5.57
1051
7.96
179
0.85
475
3.24
791
5.64
1058
8.03
188
0.92
485
3.31
800
5.71
1065
8.10
196
0.99
494
3.39
809
5.78
1072
8.17
204
1.06
503
3.46
818
5.85
1079
8.24
213
1.13
513
3.53
826
5.92
1086
8.31
221
1.20
522
3.60
835
5.99
1093
8.38
229
1.27
531
3.67
843
6.06
1100
8.45
238
1.34
541
3.74
852
6.13
1108
8.52
246
1.41
550
3.81
860
6.20
1115
8.59
254
1.49
560
3.88
869
6.27
1122
8.66
263
1.56
569
3.95
877
6.34
1129
8.73
271
1.63
579
4.02
885
6.41
1136
8.80
280
1.70
588
4.09
893
6.48
1143
8.87
288
1.77
598
4.16
901
6.55
1151
8.94
297
1.84
607
4.23
909
6.62
1158
9.01
305
1.91
616
4.30
917
6.69
1166
9.09
314
1.98
626
4.37
925
6.76
1173
9.16
322
2.05
635
4.44
933
6.83
1181
9.23
331
2.12
645
4.51
941
6.90
1189
9.30
340
2.19
654
4.58
949
6.97
1197
9.37
349
2.26
663
4.65
956
7.04
1205
9.44
357
2.33
673
4.72
964
7.11
1213
9.51
366
2.40
682
4.79
971
7.19
1222
9.58
375
2.47
691
4.86
979
7.26
1230
9.65
384
2.54
701
4.93
986
7.33
1239
9.72
393
2.61
710
5.00
994
7.40
1248
9.79
402
2.68
719
5.07
1001
7.47
1257
9.86
411
2.75
728
5.14
1008
7.54
1266
9.93
420
2.82
737
5.21
1016
7.61
1276
10.00
THIS UNIT HAS BEEN FACTORY SET AT ____________ CFM.
www.nailor.com
SUBJECT TO CHANGE WITHOUT NOTICE
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)
‐
0.34000
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.
CFM vs VDC (Imperial Units)
CFM
CFM
CFM
CFM
Application Charts for ECM Motors
Airflow Direction (affixed to inlet collar)
AIR FLOW (ECOULEMENT DE L'AIR)
AIR FLOW (ECOULEMENT DE L'AIR)
LOW (BAS) HIGH (HAUT)
HIGH
(HAUT)
LOW
Table 1.
