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30 BCXC-SVX01B-EN
Installation Electrical
See Table 13 for electric heat kW and Table 14, p. 31 for motor FLAs.
Select a standard fuse size or HACR type circuit breaker equal to the MCA.
Use the next larger standard size if the MCA does not equal a standard size.
Standard fuse sizes are: 15, 20, 25, 30, 35, 40, 45, 50, 60 amps
Useful Formulas
kW = (cfm x ΔT)/3145
ΔT = (kW x 1000)/voltage
Single phase amps = (kW x 1000)/voltage
Three phase amps = (kW x 1000)/(voltage x 1.73)
Electric heat MBh = (Heater kW) (3.413)
Table 13. Available electric heat, min–max (kW)
Voltage
Unit size
12 18 24 36
54
72 90
115/60/1 1–3 1–3 1–3 1–3 1–3 1–3 1–3
208/60/1 1–4 1–6 1–8 1–8 1–8 1–8 1–8
230/60/1 1–4 1–6 1–8 1–8 1–8 1–8 1–8
277/60/1 1–4 1–6 1–8 1–11 1–11 1–11 1–11
208/60/3 1–4 1–6 1–8 1–11 1–12 1–12 1–12
230/60/3 1–4 1–6 1–8 1–11 1–12 1–12 1–12
460/60/3 1.5–4 1.5–5 1–8 1–11 1–16 1–21 1–30
575/60/3 2–4 2–4 1–8 1–11 1–16 1–21 1–30
220/50/1 1–4 1–6 1–8 1–8 1–8 1–8 1–8
240/50/1 1–4 1–6 1–8 1–8 1–8 1–8 1–8
380/50/3 1–4 1–5 1–8 1–11 1–16 1–20 1–28
415/50/3 1.5–4 1.5–5 1–8 1–11 1–16 1–21 1–30
190/50/3 N/A N/A N/A N/A N/A N/A N/A
Notes:
1. Heaters are available in the following Kw increments: 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5,
6.0, 6.5, 7.0, 7.5, 8.0, 9.0, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18.0,19.0, 20.0, 21.0,
22.0, 24.0, 26.0, 28.0, 30.0.
2. Magnetic contactors are standard. Mercury contactors are available on horizontal units only.
3. Units with electric heat are available with or without door interlocking disconnect switch.
4. Units with electric heat are available with or without line fuses.
5. Units with electric heat must not be run below the minimum cfm listed in the general data section.
6. Electric heat is balanced staging: 1 stage = 100%, 2 stages = 50%/50%
7. Electric heat is not available on 190/50/3 units.
8. For two-speed units not being controlled by the Tracer™ family of controls, a 0.2-second delay for
speed switching needs to be incorporated into the control sequence.