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Thread: R410A Question
03-28-2007, 10:44 PM #1
I have a question on this... I am trying to figure out the temps and all that with R410.... We had a mini split to install today which was a R410 system... On these units you have NO liquid side to put your gauges on... At 80 degrees we had 55 psig and the temp at the air handler on the copper line set was 45.3 degrees.... what is the superheat for this and how do you get the correct spec on the freon.... I know that it has to be about a 10 degree diff here but I am lost when you dont have the liquid side to work with....
I have been in A/C field for almost 5 years now and I am just now working with the R410A... I use to push it off on other techs but as the times change I guess it is time to buckle down with it....Sir Ace says, Don't hate the breed, just the breeder!
03-28-2007, 11:27 PM #2Professional Member*
- Join Date
- Jul 2006
i find it best to weigh in the charge on this type unit
03-29-2007, 09:53 AM #3
03-29-2007, 10:14 AM #4
You can't charge by subcooling or superheat on those systems. You must weigh the charge.Merry Christmas
03-29-2007, 08:37 PM #5
I have heard a few different things from other tech's but they dont have the experience with the 410... However, if you do it by the scale that is cool when it is empty, but what took place was we went to do the flare on it and it leaked out, put a vac on it and it held. However, for whatever reason it leaked upon releasing the 410 into the system... SO therefore, we did not know how much we lost... I over charge her and she popped on me after 20 seconds or so... I had the suction side to 150 = 55 on the psig for the 410 which held ok and was cooling just nicely... Hate to do that without getting the right specs but it had to be done for now until I can really understand the 410 temps.... Had a cold one in the hand..... Felt good to me!!! NOT!Sir Ace says, Don't hate the breed, just the breeder!
03-29-2007, 10:32 PM #6Professional Member
- Join Date
- Mar 2007
- Houston, Texas
Recovery the refrigerant out of the system, install new service port on liquid line. Pull vaccum and etc, charge up the exact weight what nameplate said or do the pressure temperture.
03-29-2007, 10:39 PM #7
Isn't there a liquid line service valve inside the unit next to the compresor?If you choose not to decide you still have made a choice.
On the train of consequences there ain't no turning back.