Best Of
Re: Remove PTAC unit for servicing
That looks like a modified PTAC to me. I've done plenty of PTAC"S and never seen the hot water coil on the discharge, external to the unit. Generally PTAC"S are a packaged unit that slides out of their casing so it can be repaired. preferably on a bench. Take the old one out and slide another one that's already been repaired. Maybe that's so old and that how they did it. looks like it will still slide out if you can support the coil. hang it from the window sill. might have to call McGyver
pedmec
Re: Rust in one pipe system
Any pipe above the boiler water line usually lasts forever. It's just the pipe below the water line that causes issues.
Re: What are the most well-established US manufacturers of residential electric boilers
If going all electric just put electric baseboards in each room!
At least you'll be able to control each room separately.
pecmsg
Re: Daikin 2-Zone - Which port to charge? - Instructions confusing
If you didn't vac it down, it isn't going to work.
ratio
Re: Heating Help Partners with SkillCat for App-Based HVAC Learning
Very smart partnering…whenever access to education is made easier, everyone benefits. Mad Dog
Re: Megapress G
We are not allowed to use galvanized steel on gas piping in Massachusetts. I wouldn't recommend spray paint if you do have to paint the pipe. it just gets everywhere. roof, rooftop unit, cloths etc. We brush it on just to keep the site clean.
pedmec
Re: Daikin 2-Zone - Which port to charge? - Instructions confusing
Both lines are on the low pressure side of the system, which is why they only give you one service port. You will get the same reading if they gave you a service valve on the line labeled "liquid". The TEV is in the condenser so the line labeled liquid is the outlet of the TEV which during the operating sequence will be mostly liquid even thou its starting its phase change.
if you have a system operating with 410a refrigerant, you have a blended refrigerant. Because you have a blend you have (2) refrigerants working together but they have different boiling points. if you charge in vapor there is a real chance that you will fractionalization, the separation of the refrigerants. You can have one entering the system more than the other so the composition will not be correct.
to avoid that you turn the cylinder upside down and allow the refrigerant to leave the cylinder as a liquid. but this doesn't mean to allow liquid into the system. you meter it in with your gauge or you can buy a tool that will help you with that.
pedmec
Re: Megapress G
I did multiple Viega training at their New Hampshire facility and was specifically told not to silicone the gap. its not an approved installation practice by Viega. I can't remember why.
As far as painting gas pipe. It all needs to be painted outdoors. why would a Viega fitting be any different. its carbon steel.
pedmec
Re: Daikin 2-Zone - Which port to charge? - Instructions confusing
Liquid (bottle upside down) into the suction port. Probably doesn't matter which head, as long as the entire system is operating.
ratio
Re: heating oil tank manufacturer's warranty voided by transfer of oil from the old tank?
This is one of those things like "you must always install a drop header" or "you must use all boiler supply tapings on a steam boiler" or "don't use Teflon tape on oil lines".
All oil tanks collect water from condensation because basements are usually cooler that the outdoor temp in the summer.
A lot of people transfer oil from old to new tanks. Is it a problem? Who knows.
The MFGs stich their orr in the water to CTA. Just like they do with Teflon tape. We used Teflon for years before that rule changed with no issue.
Something happens down the road with a tank and the MFg anit gonn pay no matter what they are long gone. We all know that. they don't pay when boilers crack either. They can always find an excuse.