Electrical Requirements
52 CLCH-SVX009J-EN
Important recommendation
Do not bundle or run interconnection wiring in parallel
with or in the same conduit with any high-voltage wires
(110 V or greater). Exposure of interconnection wiring to
high-voltage wiring, inductive loads, or RF transmitters
may cause radio frequency interference (RFI). In addition,
improper separation may cause electrical noise problems.
Therefore, use shielded wire (Beldon 83559/83562 or
equivalent) in applications that require a high degree of
noise immunity. Connect the shield to the chassis ground
and tape at the other end.
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 Table 13. 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 57. Interface power requirements
Line
voltage
24 Vac
Transformer
Termination board
Table 11. Electric heat voltage ratings
Unit Voltage Heater Voltage
200 200
230 230
460 460
575 575
Table 12. Electric heat kW limits (min/max)
Motor 3 6 8 10 12 14 17 21 25 30
200 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 13. 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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