You are right.
He is wrong.

Xfmr va should equal OEM spec.

 

Yea, the 2TEC3F60 comes with a 75va. Gotta be a reason

 

Ditto. If Trane could get away with a 40VA, don't you think they'd do it? It's cheaper. His reasoning doesn't pass the sniff test. Glad you're smarter than he!

 

when the 40va burns out send him back with the 75 with orders to do it right this time

 

on his dime

I would cal the customer now and let him him your tech made a mistake, the right part has been order and the tech will be back to put the right part in.

 

You should send him back immediately as the 40 VA usually will not fail quickly and as it gets overloaded the output drops where the circuit board could be damaged. Then you have two replacements in place of one.

Solid state stuff does not like to work on less or more than factory specs when it comes to voltage.

 

Yep,yep,yep!



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Yes Sir, seen that happen in the winter too. Unit called for defrost contactor at the heat strips were badly burned and the defrost board was baked. Its to bad I did not know about this site them would of made a nice pic in the wall of shame!

p.s its on the schedule first thing 2morrow!

 

Just install the one 40 va and leave the other one at the site as a spare.

 

twilli used to be a 40va transformer. now he's upgraded to a 75.

 

Go twilli


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with or without the reset breaker????

 

A 40va transformer can only safely deliver 40va that is only about 1/2 the wattage (power) that the 75va can deliver. That should be changed to the correct size transformer before secondary damage occurs. Circuit boards, contactors, etc... Those devices all require a specified amount of current and that 75va transformer was OEM because it could deliver the required power. The smaller transformer will undoughtedly be supplying low voltage conditions since it is being overloaded, well until it lets the smoke out anyways.

 

<sniffs> I LOVE the smell of burnt transformers in the mornin'

 

I hadn't even noticed that they came with a 75va transformer...
How did a transformer managed to get killed in the unit anyway? Someone bypass the fuse?

 

On this Trane unit a m/n# TWE there was no fuse I don't know if it was cut out by some other tech? There was a short at the condenser insulation broke of the wiring! Oh and the 75va for that Trane unit is about half the size of our after market part 75va.

 

Would it be blasphemy to suggest wiring 2 standard 40's in parellel? And add a fuse.

 

A purist would say yes, I do believe.

However, Aaon uses 2 75 VA Tx's instead of using 1 150 VA Tx. The 1st thing that comes to my mind is how much available space is there? 2nd thing is why not just use the right stuff the 1st time and not worry about getting creative?


Aaon...*shudder*

 

V A stands for Volt Amps. So to make this simple lets say the transformer is 25 volts. So 40va divided by the 25 volts = 1.6 amps. if the circuit pulls over this, well we all know the smell or are about to. So 75 va divided by 25 volts = 3 amps, nearly double the load. Hope this makes sense.

 

Related?

I had my muffler replaced at a reputable shop. It didn't sound right, so I looked under the car. It was installed BACKWARDS!

I took it back. The car was returned. It still didn't sound right. It was still on BACKWARDS!!

I took it back the third time and an EXPERIENCED tech took a look at it and when I went to pick it up is said that the exhaust pipe that was installed was bent improperly from the factory and that the kid that installed it said "IT FIT BETTER THAT WAY".

Sounds like the 45 VA xformer fitting in the 75 VA space.