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Re: A/C Capacitor Voltage
I've seen capacitors rated for all kinds of voltages
16, 35,50,63,75, 600 etc.
ChrisJ
Re: Your thoughts and opinions please
Your curriculum is excellent for a well seasoned person with years of experience as a brush up and review...A full day class, no less. It's a pretty good bet, the class experience will vary greatly. Could it be that this is the client's wish list? Cover all bases AND in 3.5 hours?
Just covering all those points, without anyone asking a single question is rough. I would run my concerns by the client, hopefully he will modify accordingly. All salient points from the guys. Mad Dog
Always assume the old steam boiler was installed wrong, this weeks video
This never happened with the old boiler is phrase I heard often until I started thinking every steam boiler was installed wrong until I proved it wasnt. There is a hidden clause when installing steam boilers that you dont discover until the boiler is installed, You own all the system problems. Hope you enjoy
Re: A/C Capacitor Voltage
That's why I never dug too far into it.
I just automatically buy 440v caps, regardless, specifically Titan HD which say they're made in USA.
ChrisJ
Re: A/C Capacitor Voltage
If you need a 370 V capacitor you can use a 440 v capacitor. If you need a 440 V capacitor you can not use a 370 V capacitor. So if you don't know if you need a 370 or 440 then you should use the 440. If you can find the original specification in the equipment docs, and it specifies a 370, the you are good to go.
Re: A/C Capacitor Voltage
TL;DR: it's probably fine. If in doubt, get the higher rating.
Compressor, fan, dual? If you went to the supply house & they looked it up from the unit model & serial, I would imagine that's the right one. If you just crossed it over from the existing, I would've expected a 440 volt one, or dual rated. Like @ChrisJ and @EdTheHeaterMan said, a higher voltage rating will substitute for a lower—but not vice versa.
It's my understanding that the motor design determines the voltage of the cap. (I read that on the Internetz some time in the last few decades, so it must be true!) In any case, you can verify the voltage by simply measuring the voltage across the cap with the unit operating, it'll be around 370 volts, or it'll be around 440 volts. The outdoor fan motor and the compressor both should have a nameplate that specifies the capacitance and voltage of the required cap. Two separate ones work the same as a dual. Oval vs round is merely mechanical, you can use either if you can get it tucked up in there somewhere.
ratio
Re: 1 Ton = 400 CFM??
Just for fun, I ran some numbers. If your indoor temperature is 74F, your air handler is running at 400 CFM and your AC is delivering 12,000 BTU/hr:
- At a dewpoint of 46F or below (37% RH) the air comes out at 46F
- At a dewpoint of 50F (42% RH) the air comes out at 48F
- At a dewpoint of 60F (63% RH) the air comes out at 55F
- At a dewpoint of 70F (90% RH) the air comes out at 63F
The SHR ratio for those four scenarios is 100%, 92%, 65%, 38%.
AC is kind of magic this way, the more humid it is, the more dehumidification it does.
