I hear u brother When my daughter call me I may be in a ladder ,,,,,,,roof......under a mob home.....or an attic and I ll drop everything to answer the phone......,I guess is her mom legacy for me..,,,.she is gone but I got her........hey You are a great mechanic being in RTU in roofs many times n sometimes we do our best or all we know,,,,,,this is a great video. Tnks n bless you and your family
I spoke to a Trane tech support on this issue. They have a TXV conversion kit and I was told to install crankcase heaters that is one of the reasons why there's some waxing the oil gets thickened up or something like that if there's no crankcase heater. Where I work at a school district main server room is served by one carrier with that style of metering and I put crankcase heaters on there and haven't had a problem in almost 10 years
Thank you for this video. These old Carriers, Bryant’s and Tranes are surrounding me …:). I’ve got one 10 ton Carrier for tomorrow (this one is only 4-5 years old) and one Dino Carrier that is ~25 years old for another day. For r-22 I usually drill them with pretty good outcomes. Will try your method with acetylene torch. It seems a bit easier.
It works we do it too, we usually add driers with flares and ball valves. End up having to clear them several times and keep changing the driers. Love ur videos long time fan
Was looking for the metering device is just a pipe nothing more , so you recommend me to cut the liquid line before the evaporator and heat up the orifices the blow nitrogen through the suction line and didn't need to flash the system with r 11
I think I still have one somewhere, been probably over 20 years since I used it. Ahh, the god old days, when you could pinch off the liquid line on a unit with no service valves to pump it down, do your repair, and just purge the lines with refrigerant, reround the pinched off pipe, and get on to the next call. :D
How hot is your ambient temperature? And how hot was the return air temperature ? I’ve worked on the same model unit and cleared the metering device and I’ve been able to bring it down to 240 psi on a 93 degree day with 80 degree return temperatures Pressure dropped further when return temperature cooled down
I don't recall what it was when I made the video but as of mid October were just now getting down to high temps of ONLY 100. We run high temps of 100 to 120 degrees from May through October. I posted this on Sept 7th of that year so it was done then or days earlier. So probably 105 to 110 degree high temps.
Hey brother, just curious, why is 3degrees SH acceptable? In class we were thought 5 to 20 as the range, anything under 5sh you’re getting into risky territory
This was years ago so I don't recall more details but in the video I noted it was a little low at that moment. Pulling panels off and on repeatedly during the recording may have skewed it a few psi vs degrees etc. It is a fixed multi piston device. Only adjustment would be adding load via more supply fan cfm to increase superheat. Fixed metering devices otherwise have no adjustment.
Do you believe it's absolutely necessary to use that much heat? Or maybe a better way to ask the question , have you had success using less Heat? Thanks, Pete.
Thank you for the tip! I’ve got two of these guys lined ahead of me :) I used to drill these headers. Drilling does work great, but it is time consuming and it’s not very easy thing. Will try MAP gas this time.
Yes. However that only works on straight cool units. Heat pumps have header check valves and the coil feeds all tunes in parallel for evaporator mode but separate a subcool loop in condenser mode.
Is have no reason to have that information. The orifices aren't something you buy by themselves. If replaced you order the orifice header manifold for the specific system.
Someone was mentioning how one manufacture wanted the techs to run some sort of chemical through the system (on warranty) before getting parts to repair the restriction.
Did you watch the video? The coil face wasn't shown in the video and the readings do not indicate a "dirty as hell" condenser coil. A very used unit and all however the OD Coil was not the issue. The issue was a restriction in both the filter drier and the multiple parallel indoor coil fixed pistons. Something that occurs in these units occasionally and was repaired in the video.
Temporary unplug a system with overheated chemically broken down oil still circulating. Also old R-22. You didn't do anyone any favors playing cowboy tech.
Installing an actual filter drier ahead of the metering device has done wonders. I've yet to go back to any of these fixes and find them plugged again. Even the compressor has hung in there on most of them. And this repair is like $2k cheaper than replacing a coil (what most techs do to fix it) so yeah. I did them a favor and saved some $ not too mention could fix the unit in the same day.
