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Lyndal
heating unit flipping breaker

We have a Westinghouse heating/air conditioning unit that is about two years old. Never had any problems until now, and in the last six weeks, the breaker has flipped off three times when the unit is on. The person who installed the unit insists it is the breaker. We had the breaker replaced two days ago, and this morning it flipped off. The unit only draws 60 amps tops, and the breaker is a 70 amp. What could be causing this? Any suggestions?

canuk
Re: heating unit flipping breaker
Lyndal wrote:

We have a Westinghouse heating/air conditioning unit that is about two years old.

paretoslaw wrote:

A continuous full load of 60 amps at code required 80% load would require 72amps, or an 80amp breaker minimum.

Wire size should be considered as well.

I would post a link but the board would more than likely delete my account as spam....:rolleyes:

Hmm ---- interesting though it would seem this wasn't an issue originally.
Considering the OP mentioned the breaker is 70 amps would more than likely be 80% of that value and not having 60 amps running continious.

So ---- 70 x 0.80 = 56.6 amp
Allowing for the 115% thermal overload protection requirements for motors would likely put the amount to be around 58 amps ---- the way I see it.

Quote:

Never had any problems until now, and in the last six weeks, the breaker has flipped off three times when the unit is on. The person who installed the unit insists it is the breaker. We had the breaker replaced two days ago, and this morning it flipped off. The unit only draws 60 amps tops, and the breaker is a 70 amp. What could be causing this? Any suggestions?

Well it doesn't sound like the breaker since it had been replaced and still doing it.
I'm assuming this is a heat pump.

A few things that might cause this .........

capacitor

Loose electrical connection -- especially if aluminum wire is used

compressor

Low voltage to the house

JLMCDANIEL
Re: heating unit flipping breaker

Have you had the unit serviced? It could be a dirty filter or dirty blower causing the motor to draw a little more current.
Jack

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