Re: [DML] Constant tripping of the cooling fan breaker
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Re: [DML] Constant tripping of the cooling fan breaker



Hi Ken

With a multimeter set to Current (most DMMs will do 20A), using the fan-fail socket, and the fan relay socket next to it (ie un plug the fanzilla) you can measure the current drawn by each fan. I expect you will discover neither draw more than 15A (both mine are fused at 15A and the fuses are fine).

The way a circuit breaker works is a bi-metalic strip - it works like a thermostat and breaks contact WHEN it gets hot. Extra heat can be generated by dirty contacts to the breaker itself, a nearby heat source, and a lack of ventilation. Ventilation you can't do much about, but see if anything next to it also gets hot, and clean or even re-crimp the connectors on it.

Martin
#1458

Montgomery, Ken wrote:

Hi gang,

I've come across a problem I've not been able to solve. The circuit breaker
to the cooling fans keeps tripping when the air conditioner or the otterstat
has them switched on. It happens after the car and fans have been running
for a while and the breaker has become hot. I thought I may have just had an
old or defective breaker (40 amp) but the replacement does the same thing. I
have a FanZillia, the fuses on it are holding and both fans turn easily. Why
are they drawing so much current? I'd just jump the breaker and rely on the
fuses but That's just not a good answer.

Does anyone have any suggestions?

Ken








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