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NFPA 90a Installation of Air Conditioning and Venitlating Systems 2002
NFPA 90b Installation of Warm Air Heating and Air Conditioning Systems 2006
NFPA 91 Standard for Exhaust...

Thanks for the reply. I have made a lot of final connections at furnaces, but the whole underground thing is making me question the method I should use. I don't like flare fittings on refrigeration,...

I want to run a 1/2in gas line from my gas meter to a small appliance. The distance is only about 5 or 6 feet where it would penetrate a brick wall. I would like to run it underground and was...

I was just refering to start assists that are all in one type devices (simply plug onto run cap). I live in Florida and have never heard of or had any trouble with the superboost not working in hot...

Some people don't like the start assist type devices (superboost, kickstart, etc). I have had problems with kickstart, but I've had good success with the superboost SPP6. It is a solid state type...

I used to work for a Lennox dealer and we used to never match a different brand condenser to a Lennox A/H. This was only true for heat pumps. I know it is better to do a complete change out, but some...

I'm have trouble finding a part for a refrigerator. The part number is WR12667 or WR120667. Do you know of a place on the web I can go to find hard to get parts? Or, maybe a place that sells used...

I have been an HVAC technician for about 5 years now, so I'm not a conventional student. I do get ideas about how it could have been done better or how something could have been designed better to...

Are there any mechanical engineers that visit this site? I just started my third year/junior year at a university and was thinking about changing my major to mechanical engineering. I haven't done...

When the power goes off in commercial buildings and the power is switched to a generator, does the power only feed low power consumption devices? Will it still power A/C condensers if the transfer...

No need to get pissy. I don't do work for myself. I can ask my boss why we don't. There aren't a whole lot of 90 % in central Florida, and there definitely aren't a whole lot of people that would...

I have noticed on some changeouts that the flue pipe is smaller than would be put in if it were new construction. For example, a 100,000btu furnace with a 40,000 water heater tied into a 5" flue. Is...

I know some of you here like being in the HVAC business, but if you had the chance to do something else, would you do it? I know there are doctors out there that would change their career if they...

In my area, we are only suppose to do electrical work from the after the disconnect. However, it is very common for installer/technicians to replace the box. I think this unit is extremely dangerous...

We do primarily residential work, but we do deal with some commercial. I was installing a 3 phase condenser and notified my boss that there was no ground coming into the disconnect box. He told me...

I had this same problem in Florida with an A/H in the garage. Do you have a variable speed A/H? See if the dip switches are set correct and make sure the installers didn't hook the yellow wires to...

I am a service tech that just does HVAC. My friend called me up today and said his refrigerator at his house wasn't working. I haven't worked on a refrigerator since HVAC school. Well, I found that...