Central air conditioner fuse

by Dadan

What is central air conditioner fuse?

An air conditioner fuse prevents any parts of HVAC to overload or overheat.

Is a safety (device) that tells the HVAC unit, ok - you supposed to draw 30 Amp. If any part of you draw more than 30 Amp, I’m gonna turn you off.

The fuse box should be in the line of vision; it should be within REACH from the condenser unit location. The fuse for HVAC unit is Heavy duty time delay cartridge fuses. The fuse is within the fuses holder.

The within REACH disconnect is in metal box. It is either a handle that you pull out, within this handler, there is two fuse in the fuse holder. Or there is breaker.

If there isn’t disconnect box within REACH, there should be breaker box within 5 feet from the condenser unit. The condenser switches are within the breaker box.

Important

Indoor and outdoor unit have TWO different fuses switch. Indoor unit has it owns fuse or breaker switch, the same for the outdoor unit.




Question and Answers

Can I put two different Amp fuse in the fuse holder?

Is it ok to have 2 different size fuses in the outside disconnect box? I have a 20 amp and a 30amp fuse. Could this cause the compressor to blow? The max amp is 30/30 on the AC cover

Answer:

No. If the original fuse were 30 amps. You should replace it with another 30 amps fuse. The fuse should be time delay fuse. It should say that in the fuse.


“Both fuses should be 30 amps. The fuses should be dual element, slow blow type. You likely will not hurt the system, but the 20 amp fuse will most likely open at the most inopportune time.” By Chester

5 amp fuse in air handler blows

The 5 watt fuse blows in the air handler. This only happens when the outside unit kicks on. The air handler will run if there is no power to the outside unit. Changed stat wires and it still blows the fuse.

Answer:

Sounds like you have a short between the outdoor unit and the control board on the air handler. Your technician needs to check the "Y" circuit for a short. By Chester

Condenser unit blow fuses right away. Why?

If the condenser unit is blowing fuse, there is part within the condenser unit which is pulling more than it Amps. The reason it blows fuses could be: the condenser unit is short to ground, electrical wire is loose, high discharge pressure, bad compressor..etc

If you put fuses in and it blows, don’t put anymore fuses. Have it checks by a tech – yeah, it cost money. Btw, central ac unit is on its own circuit