Mini Split Heat Pump Breaker Requirements


Old 10-13-08, 07:01 PM
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Mini Split Heat Pump Breaker Requirements


I've just received a mini split having an attached label that only gives wattage requirements for this unit. Maximum wattage is 2500. Dividing this by residential voltage of 220 produces a result of 11.36 amps. I'm assuming that a double pole breaker labeled 15 amps that serves a #14 cable circuit would be appropriate. I'd appreciate someone more knowledgeable confirming this.

Also, I've noticed that many forum members use 240 volts when doing residential calculations. Since 240 volts would appear to be a rarity in a residential environment, is this ok?

Thanks in advance for any info.
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Old 10-13-08, 08:59 PM
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I agree that a 15A 240V circuit is okay for this unit given the wattage specs, but I would probably install it with #12 wire. Does the unit specify a maximum overcurrent protection (OCPD) or min circuit ampacity?

The nominal line-to-line voltage is 240V in most of North America. There are a few places that still do 230V or 220V, but 240V is typical now.
Old 10-14-08, 11:43 AM
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The branch circuit breaker must be rated for Heating and Air Conditioning. You'll need a HACR circuit breaker.

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