Electrical Requirements
44 CLCH-SVX009A-EN
Useful formulas:
kW = (Airflow x Delta T)/K
Delta T = (kW x K)/Airflow
K = 3145 (English)
K = 824.7 (SI)
Heater input current = (kW x 1000)/(Voltage x 1.73)
MCA = Minimum Circuit Ampacity
MOP = Maximum Overcurrent Protection rating or
Maximum fuse size
Fuse Sizes
The standard ampere ratings for fuses and inverse time
circuit breakers are listed in Ta ble 12. The use of fuse and
inverse time circuit breakers with non-standard ampere
ratings shall be permitted provided the rating does not
exceed the maximum fuse size defined on the unit
nameplate.
Figure 39. Interface power requirements
Table 10. Electric heat voltage ratings
Unit Voltage Heater Voltage
208 208
230 240
460 480
575 600
Line
voltage
24 Vac
Transformer
Termination board
Table 11. Electric heat kW limits (min/max)
Motor 3 6 8 10 12 14 17 21 25 30
208 V / 60 Hz / 3 PH 6/13 6/26 7/28 8/41 10/50 12/50 14/50 17/50 20/47 20/41
230 V / 60 Hz / 3 PH 6/13 6/26 7/32 8/41 10/53 12/59 14/59 17/59 20/56 20/50
460 V / 60 Hz / 3 PH 6/13 6/24 7/32 8/44 10/53 12/63 14/75 17/95 20/95 20/120
575 V / 60 Hz / 3 PH 6/13 6/26 7/34 8/44 10/53 12/63 14/75 17/95 20/95 20/120
Min airflow (CFM) 1050 2100 2800 3500 4200 4900 5950 7350 8750 10,500
Notes: Units drawing less than 100 amps are available with or without door interlocking disconnect. Units drawing more than 100 amps are not available
with door interlocking disconnect.
Units drawing less than 48 amps are available with or without line fusing. Units drawing greater than 48 amps have line fusing as standard.
Units with electric heat must not be run below the minimum cfm listed above.
Heaters available in the following kW increments: 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 41, 44, 47,
50, 53, 56, 59, 63, 67, 71, 75, 79, 83, 87, 91, 95, 100, 110, 115, 120.
Table 12. Standard fuse sizes (amperes)
15 20 25 30 35 40 45 50 60 70
80 90 100 110 125 150 175 200 225 250
300 350 400 450 500 600 700 800 1000
1200 1600 2000 2500 3000 4000 5000 6000
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