Is charging a R410a system the same as a R-22 system... - DIY Chatroom

paulie pizza · 03-17-2009, 08:09 PM

is charging a 410a the same as Charging a R-22 system......other than charging a 410a in a liquid form

beenthere · 03-17-2009, 09:16 PM

Charged by superheat and subcool.

paulie pizza · 03-18-2009, 05:55 PM

thanks..
I bought a fieldpiece subcooling and superheat meter........I have not used it yet.....im going to read up on the instructions and go that route on charging by superheat and subcooling........can you charge a system when it is cold out?......On r-22 you can wrap the condensor with a tarp and clear the sightglass to fool the unit....is that a good way to do it and if it is, would that work for 410a......and does this make sense to you ?

yuri · 03-18-2009, 06:04 PM

If life were only that simple. I use the charts that give you superheat and subcooling and (Lennox, approach) methods and are included with the unit. You have a lot to learn but we will try and help you if you have a bit of thick skin. You have to understand the type of load (heat, humidity) airflows and how they affect a unit. A lot of different conditions can affect charging a unit an fool you into overcharging etc. A dirty A coil will slow down the air/lower suction pressure etc so I would recommend you do the NATE courses and learn about all this. I will rarely charge a unit when it is less than 70 deg F outside AND you need a load in the house. Wrapping the condensor rarely is accurate and unless you have LOTS of experience it will go badly for you and generate lots of callbacks. Lennox has lots of internal training courses for their dealers and if you deal a major brand then check with them if they have one for you. Make sure you understand all the dangers of working with high pressure refrigerants. Safety glasses, gloves, NO damaged or dubious quality hoses.

Good Luck

beenthere · 03-18-2009, 06:11 PM

Using a tarp and clearing the sight glass isn't a great way to charge in cold climate conditions.

A tent, or tarp is find.
but, you need to have the subcool for those outdoor temp conditions you are simulating.

If its a piston/fixed metering system. then you need to simulate a warm/hot out door day, that matched the indoor conditions.

Simulating a 95° outdoor temp, with a 50° indoor wetbulb, won't get your charge correct.

With that indoor condition, a 60° outdoor temp would be what you would simulate.

kenmac · 03-18-2009, 06:43 PM

I would also get a set of low loss fittings for your guage hoses..don't use the same hoses / fittings with R410 & then try to use them on R22... Make sure your hoses are rated for the pressures of R410

paulie pizza · 03-18-2009, 06:56 PM

Thanks for help Beenthere and Yuri......
I bought a 410a book today and going to read up on it....I'm going to take the class next month. I want to be ahead of the class I have installed units in the winters(410A)....brand new systems...all 9 yards...ducts,piping and etc.... installed a sight glass and drier. I measured the pipng to the exact or closest feet of Refrigeration lines....leak checked, pulled a vacum on system and weighed in correct ammount of 410a for the length of pipe run...I've put in about 10 systems over the winter and as the weather starts to get warm, I will be ready to check theses systems for proper operation......
thanks all for your time
Paulie Pizza

biggles · 03-18-2009, 08:42 PM

with the unit not powered up....and the VAC completed go right to the king valve on the condenser with a single hose and the 30lb drum of freon.connect the hose to the upright tank crack the tank to bleed a slight gas pressure and hook it up to the king valve and open it half way.open the tank valve 100% and flip the tank......liquid will fill the LL into the air handler and the bottom of the condenser till the pressures equalize.you are now 80-90% charged without even running the compressor

.shut the freon tank off all the way up on the king valve stem to full open running position disconnect the single hose.the rest if any of the charge will be determined by the SH/SC readings with some what of a load on the evap coil...check your amps on the runnibf compressor inlet air into the condenser pus 30F to see how the head is wit the days temperatures.then fine tune it with those readings..forget the sight glass being clear

if you have a laser thermometer hit the bottom bends on the condenser working your way up the rise in temp will be the difference between the liquid and the hot gas.2 to 3 rows on the bottom for liquid.

hvaclover · 03-18-2009, 08:43 PM

Quote:

Originally Posted by paulie pizza

Thanks for help Beenthere and Yuri......
I bought a 410a book today and going to read up on it....I'm going to take the class next month. I want to be ahead of the class I have installed units in the winters(410A)....brand new systems...all 9 yards...ducts,piping and etc.... installed a sight glass and drier. I measured the pipng to the exact or closest feet of Refrigeration lines....leak checked, pulled a vacum on system and weighed in correct ammount of 410a for the length of pipe run...I've put in about 10 systems over the winter and as the weather starts to get warm, I will be ready to check theses systems for proper operation......
thanks all for your time
Paulie Pizza

I'm gonna have to talk to my Godfather. If 'da pizza guzys is gonna cross into our territory wez is gonna do 'da same. How do you guys like your pie?

Hey Beenthere, by pass the slef cleaning lock on the kitchen stove. We got pizza to make

beenthere · 03-18-2009, 08:54 PM

Quote:

Originally Posted by hvaclover

I'm gonna have to talk to my Godfather. If 'da pizza guzys is gonna cross into our territory wez is gonna do 'da same. How do you guys like your pie?

Hey Beenthere, by pass the slef cleaning lock on the kitchen stove. We got pizza to make

LOL...

Acouple years ago, I could have got you 2 of Dominos old electric pizza ovens.

POS from day one.

hvaclover · 03-18-2009, 09:13 PM

Dominos is headquartered here.

Pizza sucks. We have a large local chain franchise called Jets. Cheap price but taste great!

Just had some an hour ago and my mouth is watering thinking of it.