Installation and Operation Manual
●
Fan Coil Controller – EZstat
EC-EZstat
Date: 9-2014
Supersedes: NEW
Engineered Comfort reserves the right to change any information concerning product or specification without notice or obligation.
Page 23 of 36
ECM MOTOR FAN CALIBRATION TABLE
CFM vs VDC (Imperial Units)
HIGH PERFORMANCE HORIZONTAL FAN COIL UNIT
MODEL SERIES: 35FH • UNIT SIZE 8 • 120/208/230/277 VAC
CFM
0‑10
VDC REF.
CFM
0‑10
VDC REF.
CFM
0‑10
VDC REF.
CFM
0‑10
VDC REF.
0
0.00
412
2.84
595
5.25
770
7.66
190
0.50
418
2.91
600
5.32
775
7.73
199
0.57
423
2.98
605
5.39
780
7.80
207
0.64
429
3.05
610
5.46
785
7.87
216
0.71
434
3.12
616
5.53
790
7.94
224
0.78
440
3.19
621
5.60
795
8.01
232
0.85
445
3.26
626
5.68
800
8.09
240
0.93
451
3.34
632
5.75
805
8.16
248
1.00
456
3.41
637
5.82
810
8.23
255
1.07
462
3.48
642
5.89
815
8.30
263
1.14
467
3.55
647
5.96
819
8.37
270
1.21
472
3.62
653
6.03
824
8.44
277
1.28
478
3.69
658
6.10
829
8.51
284
1.35
483
3.76
663
6.17
834
8.58
291
1.42
488
3.83
668
6.24
839
8.65
298
1.49
494
3.90
673
6.31
844
8.72
304
1.56
499
3.97
679
6.38
849
8.79
311
1.63
504
4.04
684
6.46
854
8.87
318
1.71
510
4.12
689
6.53
859
8.94
324
1.78
515
4.19
694
6.60
864
9.01
330
1.85
520
4.26
699
6.67
868
9.08
337
1.92
526
4.33
705
6.74
873
9.15
343
1.99
531
4.40
710
6.81
878
9.22
349
2.06
536
4.47
715
6.88
883
9.29
355
2.13
542
4.54
720
6.95
888
9.36
361
2.20
547
4.61
725
7.02
893
9.43
367
2.27
552
4.68
730
7.09
899
9.50
373
2.34
557
4.75
735
7.16
904
9.57
378
2.41
563
4.82
740
7.24
909
9.65
384
2.49
568
4.90
745
7.31
914
9.72
390
2.56
573
4.97
750
7.38
919
9.79
396
2.63
579
5.04
755
7.45
925
9.86
401
2.70
584
5.11
760
7.52
930
9.93
407
2.77
589
5.18
765
7.59
935
10
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. IF OPERATING IN THE SHADED AREA AT LOW VOLUMES, VARIATIONS IN FLOW MAY BE GREATER THAN 5%. 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 SUBJECT TO CHANGE WITHOUT NOTICE
Procedure
Steps
Display
Set fan speeds
for modulating
speed fans
How to Setup Fan CFM example:
Refer to the 35FH ECM Motor Fan Calibration Table. The VDC value
correlates to the CFM on the calibration chart.
Fan percentages are entered into the EZstat and convert output to
VDC.
For an example:
10% = ~1.0VDC
50% = ~5.0VDC
100% = ~10.0VDC
Digital Control Algorithm:
CFM = 0.0149(Vdc)5 ‑ 0.4423(Vdc)4 + 5.0126(Vdc)3‑ 27.6276(Vdc)2 + 149.7246(Vdc) + 121.2664
Vdc= ‑2.419E‑14(CFM)5 + 7.788E‑11(CFM)4 ‑ 1.007E‑07(CFM)3 + 6.674E‑05(CFM)2 ‑ 9.435E‑03(CFM) + 4.870E‑01
