UNT-SVX07B-EN 63
Installation—Electrical
Minimum Circuit Ampacity (MCA) and Maximum Fuse Size (MFS) Calculations
for Fan-Coils with Single Phase Electric Heat
Heater amps = (heater kW x 1000)/heater voltage
Note: Use 120 V heater voltage for 115 V units. Use 240 V heater voltage for 230 V units.
MCA = 1.25 x (heater amps + all motor FLAs)
MFS or HACR type circuit breaker = (2.25 x largest motor FLA) + second motor FLA + heater amps
(if applicable)
HACR (heating, air-conditioning and refrigeration) type circuit breakers are required in the branch
circuit wiring for all fan-coils with electric heat.
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
Fan-coil electric heat MBh = (heater kW) (3.413)
06 115 2.0 3.0
230 2.0 3.0 4.0 5.0 6.0
277 2.0 3.0 4.0 5.0 6.0
208 1.5 2.3 3.0 3.8 4.5 5.3
08 115 2.0 3.0
230 2.0 3.0 4.0 5.0 6.0 7.0
277 2.0 3.0 4.0 5.0 6.0 7.0
208 1.5 2.3 3.0 3.8 4.5 5.3 6.0
10 115 3.0
230 3.0 4.0 5.0 6.0 7.0 8.0
277 3.0 4.0 5.0 6.0 7.0 8.0
208 2.3 3.0 3.8 4.5 5.3 6.0
12 115 3.0
230 3.0 4.0 5.0 6.0 7.0 8.0 10.0
277 3.0 4.0 5.0 6.0 7.0 8.0 10.0
208 2.3 3.0 3.8 4.5 5.3 6.0
Table 11. Electric heat kW, low vertical fan-coil
Unit Size Unit Voltage kW kW kW kW
3.0 115.0 1.0 1.5 2.0
4.0 115.0 1.0 1.5 2.0 2.5
6.0 115.0 1.0 1.5 2.0 2.5
Note: Low vertical units are only available with electric heat in combination with the two-row cooling coil.
Table 10. Fan-coil electric heat kW (continued)
Unit SizeUnit VoltagekWkWkWkWkWkWkWkWkWkWkW
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