Sdge 24v Trasformer Blows Again on the High Voltage Side Sdge Surges

Yo fellas! Then i have a fleck of a head scratcher here. Installed a make new furnace, condenser, and curl. Nosotros also retro fit a Honeywell zoning system. Against what I prefer to exercise we had to put the zoning dampers directly on the plenums. All of the wiring has been inspected, no snags or shorts, but the 3amp fuse keeps blowing on this furnace. I keep wondering if in that location is a short that i am just non seeing. But the fuse doesnt blow right away. Information technology keeps happening a couple weeks autonomously. Also each fourth dimension the HONEYWELL ZONING Control Board was but fine, its only the furnace.

Nosotros installed it, three weeks subsequently the fuse blew. Inspected the wiring and put a new fuse in and then the fuse blew once again about ii weeks subsequently. I set the bypass damper to the least resistance setting and set the dampers to iii/4 setting when closed so I could dominion out static pressure and the fuse even so blew. The only reoccurring cistron is every time the fuse has diddled it was during or correct afterwards a rain.

What exercise y'all guys think? thank you guys. God bless!

Some other transformer for the zone organization cantankerous stage with FAU transformer peradventure?

What's the low voltage current & voltage? How many transformers, what are the VA ratings?

Quote Originally Posted by mgenius33 View Post

What's the depression voltage current. How many transformers, what are the VA ratings?

thanks for your response! Depression voltage is coming in at 123-130 at the plug, 1 24v transformer for the honeywell control board and one 24v transformer in the furnace. I am not currently on the site, I do non have a VA reading. Sorry

Quote Originally Posted by Juan Madera View Post

Another transformer for the zone organization cross stage with FAU transformer perchance?

hey juan. Can you explain? I am not post-obit what you lot are maxim, but im interested!

How many watts for the furnace transformer and what's the actual load ?

Quote Originally Posted by VTP99 View Post

How many watts for the furnace transformer and what's the actual load ?

I dont have a watt reading. information technology is a 120 to 24v transformer. The fuse that is blowing is the 3 amp control board fuse. When the electrician on site called me earlier he said he was getting 123 to the outlet. It is a Goodman furnace.

the fuse simply blows considering the load on it is too high, right? so, what is the load on it? trace the wires, look for shorts. As another affiche suggested, could yous have 2 transformers feeding the same circuit?

in your case here, loftier voltage is 120V. depression voltage volition be the 24V circuit.

You need to supersede the 3 amp manufactory fuse with a 5 amp fuse. And so add another three amp fuse in-line for the yellow cooling wire to the outdoor unit. When it rains again yous need to see what one blows. Have the cooling fuse visible to the owner so they tin see it. Or, they can exam cooling after a rain to come across if it still works. If it is a problem with the wires to outdoor unit it volition blow the 3 amp and the oestrus volition still work with the 5 amp fuse however good.

Quote Originally Posted by HVAC_Marc View Post

the fuse but blows because the load on information technology is as well high, right? so, what is the load on it? trace the wires, expect for shorts. As another poster suggested, could you accept 2 transformers feeding the aforementioned circuit?

in your case here, high voltage is 120V. low voltage volition be the 24V excursion.

Correct. I traced the wire. No shorts.
It'southward weird that it'due south only doing information technology afterward a certain amount of time. Well-nigh shorts pop the fuse immediately

The Honeywell zoning lath transformer 120 side is wire nut'd to the 120 hot and neutral for the furnace, then the 24v side of that transformer goes to the power terminal for the Honeywell zoning. board which.

The zoning board (which is a 2' wire run from the furnace) has equipment 24v terminal blocks that connnct to the furnace. That thermostat wire going from HW zoning board is clean. No shorts.

If the three thermostat wires going from the board to the thermostat had a short it would cause a trouble with the board. The lath is responding and operating perfectly.

Quote Originally Posted by JKopp View Post

You need to replace the 3 amp manufactory fuse with a 5 amp fuse. And so add some other 3 amp fuse in-line for the yellowish cooling wire to the outdoor unit of measurement. When it rains again you demand to come across what one blows. Have the cooling fuse visible to the possessor then they tin can see information technology. Or, they can test cooling after a rain to see if information technology still works. If it is a problem with the wires to outdoor unit it will blow the 3 amp and the estrus will still work with the 5 amp fuse withal proficient.

I similar that idea. They take just ran oestrus though, they haven't ran the cooling yet. without power going to the condenser wire would it really be a factor?

I have seen a tech miss wire the zone board and had a common from the furnace on the board or something to that result, anyways it would crusade problems merely every now and and so. I would double check to make sure the equipment and the zone lath don't have a misplaced wire or a thread of wire hit something.

Are yous sure the thermostat hasn't been set to cool (either past the homeowner or by an car function?)

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Quote Originally Posted past Snaple4 View Post

I take seen a tech miss wire the zone board and had a mutual from the furnace on the board or something to that consequence, anyways it would crusade bug only every now and and so. I would double bank check to make sure the equipment and the zone board don't have a misplaced wire or a thread of wire hitting something.

Are you lot certain the thermostat hasn't been ready to absurd (either by the homeowner or past an car function?)

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The homeowner said cooling has not been touched, merely you lot never know! I inspected our wiring thoroughly, everything is tight and in the correct place. What'south throwing me off is that I am non getting a lick of problem from the board, only the furnace. But the furnace wire is a 3' run, I tin can say for sure there are no shorts in it.

..... tough one to be sure. Endeavor ohming out the different 24v circuits that are hooked to the furnace. Maybe you have ii components that are on the edge and when run together they pull to much... Otherwise perhaps a bad board just I don't like to take that every bit a viable option until the very end.

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Quote Originally Posted by HE>I View Post

Yo fellas! So i have a flake of a head scratcher here. Installed a brand new furnace, condenser, and coil. We as well retro fit a Honeywell zoning system. Against what I prefer to do we had to put the zoning dampers directly on the plenums. All of the wiring has been inspected, no snags or shorts, simply the 3amp fuse keeps blowing on this furnace. I proceed wondering if in that location is a short that i am just not seeing. Only the fuse doesnt blow correct abroad. Information technology keeps happening a couple weeks apart. Too each time the HONEYWELL ZONING CONTROL Lath was just fine, its only the furnace.

We installed it, 3 weeks later on the fuse blew. Inspected the wiring and put a new fuse in and so the fuse blew again about 2 weeks later. I fix the featherbed damper to the least resistance setting and prepare the dampers to three/4 setting when closed then I could rule out static pressure and the fuse all the same blew. The merely reoccurring factor is every time the fuse has blown it was during or right later on a pelting.

What exercise you lot guys recollect? thanks guys. God anoint!

My thought was based on after the pelting y'all mentioned is only when it blows. Information technology could likewise be a leaking flashing from flue pipe getting things moisture inside fau. Proper sized B-vent installed correct? Look for show of water intrusion.

Remove clear and reseat all molex and other connectors. It could exist shorting when a certain path is take. If possible remove the CU and zone and allow information technology run for a week or two. Isolate the furnace equally much as possible. Debug one office at a time.

Put your VOM leads on the ii transformers "R" leads. If they are phased correctly, the voltage volition exist "0" and if out of phase y'all will get a nominal 48V. If this happens, bandy leads on ane of the transformers and try again. Should go to zero.

I check for shorts past disconnecting all t stat wires first. Put a jumper where the fuse goes. Put an amp probe on the jumper. Put t stat wires on one by one. If information technology amps upwards at all, that wire is your short. Just a jumping off point anyway

I don't hateful to sound like an a**, just you lot practice have a brusk somewhere. Fuses don't blow by themselves on a regular basis. I ran my cocky crazy looking for 1 in my house. You say it's only heating manner? Go a box of fuses and put them online with all safeties, and stats and the zone board. Who always blows is the winner, at least you know where to look.

Had a contractor kick my ass once
Disconnect low voltage to condensing unit then encounter if it fuse blows

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Sdge 24v Trasformer Blows Again on the High Voltage Side Sdge Surges

Furnace fuse bravado!

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