Was checking pressures, and a thunderstorm came over me, so I went inside and kept my pressures up on my field piece app and watched them. As as it stormed it dropped from like 97ish to like 89-90ish outside in like 15 min. It’s crazy how much the liquid side changed in that short amount of time because of temp drop and water hitting the coil. This system is a little overcharged before I got to it though.
I was at this building today replacing thermostat wire for some outdoor units because a squirrel has been nesting in all the line hide and chewing the stat wire in half. Cleaned all the squirrels nests and patched the entrances to the line hide and fixed the low voltage and never seen the squirrel til I was about to leave he showed up mad that I patched his houses.
I recently switched to commercial HVAC from residential. I’ve always been a b tank turbo torch guy. Never really liked oxy acetylene. Anyway I’ve always used the a8 size for most residential brazing, but now I work on walk ins and reach in refrigeration with smaller pipes. I was looking to get a smaller torch head for my set up. I think the a3 or a5 look adequate but does anyone have any experience with those sizes or have opinions? Also don’t hate on me for using b tank I was taught by old timers and that’s what they used so that’s what I use now.
Ive heard so many different opinions on the correct way to charge a fully recovered fully vacuumed system. Some guys say all liquid. Some guys say all through the vapor side. My old supervisor who trained me at my first job always said he weighed everything into the vapor side. I’ve had other coworkers say they weigh it in into the liquid side. My teacher in HVAC school back in the day said to do both. The liquid guys are worried about flooding the compressor. The suction guys are worried about flooding the metering device. Can someone please tell me the 100% correct way so I’m doing the correct thing. I usually take my old teachers advice and put like 50-60% through the liquid and then like 20% through the vapor side. And then start the system and meter the rest in. What’s the real answer? I’ve never had a more contested question when asking different techs.
I did residential for 2 years, got bored and went into restaurant commercial starting last week. Me and the guy that’s training me have came up on a few walk in freezers and coolers on service calls. And I’m starting the understand the basics of pump downs and fan delays and defrost clocks and stuff. But one thing that confuses me is, how is full vapor making it back to the compressor with such a low heat load across the evaporator coil? Wouldn’t that make the refrigerant not boil off completely and get some liquid into the compressor. I know in residential heat pumps, we have accumulators for this kind of thing. But the refrigeration units we’ve looked at don’t have them. Is there any major tips you guys can give me for being new into walk in refrigeration?