YJ 40812 System Analyzer

[karl k]

I just picked up one of these and love it.

Was wondering if others have had experience with them?

http://www.yellowjacket.com/product/928

[itsiceman]

http://www.youtube.com/watch?v=y4Y6kd0sK6k

I saw this the other day
Oh Boy!!? :whistle:

[jpsmith1cm]

Subcooled gas???

Drop the gauges and step away from the freezer...

[Vettgetsmwet04]

i think he meant a superheated liquid lol

to good of a tool for a tool.

[ga-hvac-tech]

I just picked up one of these and love it.

Was wondering if others have had experience with them?

http://www.yellowjacket.com/product/928

How much did that pretty puppy set you back? Just curious... I have been using a DigiCool 1200/1250 (upgraded) for 4 years now... nice tool. And to think it is in the same case as the one you have... :)

[mcjo tech]

Shouldn't adding refrigerant raise the subcooling and lower the superheat. I think he is a little confused.

He did say he was waiting for the additional refrigerant to lower his subcooling. Didn't he?

[ga-hvac-tech]

Shouldn't adding refrigerant raise the subcooling and lower the superheat. I think he is a little confused.

He did say he was waiting for the additional refrigerant to lower his subcooling. Didn't he?

I wonder if he was adding the juice as a liquid... In my experience this tends to not raise subcooling until the liquid/gas stabilizes in the system. And until the cooler gas gets back to the condenser... the SH will not go down much.

What I think the guy in the video was saying is: The readings on the YJ analyzer are suspect... However he did not explain the application well. Usually the answers are in the little details we sometimes do not look at.

[itsiceman]

That guy had no clue and said that video was for educating his employees :Faint:

[Keith73]

Subcooled gas???

Drop the gauges and step away from the freezer...

Amen brother!::DD:

[jpsmith1cm]

I actually had a tech try to blow that jive past me.

Tried fast-talking me and saying something about "over subcooled vapor"

[ga-hvac-tech]

My memory is not good here... however:

I think I remember a thread PHM started... something about charging a system and the numbers were all wrong... Stepped back and scratched his head and realized he needed to ADD more juice to lower the SC... then the SC started to rise again. Something about gas getting through the condenser.

[mcjo tech]

Looking at the pressure output of 18 low and 229 high one might reason that the unit is undercharged. He should not only be looking at the SH/SC but also the pressure changes as he tries to add refrigerant. If he continues to add refrigerant and the unit is restricted his subcooling should continue to increase as the liquid stacks in the condenser.

As he adds refrigerant to the system his subcooling does increase and the high pressre increases to 241. While his suction pressure raises slightly to 19 or so with little decrease in superheat.

It does appear as though the txv is not operating properly in this instance.

[jpsmith1cm]

Looking at the pressure output of 18 low and 229 high one might reason that the unit is undercharged. He should not only be looking at the SH/SC but also the pressure changes as he tries to add refrigerant. If he continues to add refrigerant and the unit is restricted his subcooling should continue to increase as the liquid stacks in the condenser.

You are assuming that this is a residential AC system.

Given that the rsa read r-404a and typical freezer pressures, I wouldn't make that assumption.

[mcjo tech]

You are assuming that this is a residential AC system.

Given that the rsa read r-404a and typical freezer pressures, I wouldn't make that assumption.

I was at first but it still appears to be a txv issue regardless.

[jpsmith1cm]

I agree on the TXV problem.

Without seeing the system, the superheat is way too high.

[dunkman]

I think I'm now dumber after watching that. That was painful.

[itsiceman]

I was at first but it still appears to be a txv issue regardless.

Not if there is somthing "normal" limiting suction pressure.

SH was coming down and I doubt it was from the charge added but I can't watch that even one more time :gah:

[mcjo tech]

Not if there is somthing "normal" limiting suction pressure.

SH was coming down and I doubt it was from the charge added but I can't watch that even one more time :gah:

Yea you're right. I don't really work on commercial equipment so not as familiar with the ins and outs of it. :cheers:

[mikep]

This is an R-404a LT system with TXV and most likely with a receiver and sight glass. Me thinks his high SH is due to a bad suction line temp reading and he is not reading temp at the evap outlet.

[ga-hvac-tech]

This is an R-404a LT system with TXV and most likely with a receiver and sight glass. Me thinks his high SH is due to a bad suction line temp reading and he is not reading temp at the evap outlet.

This was my thought also... Drafts, heat, exposure, etc will change temp probe (scissor or clamp type) readings. I usually wrap a rag around the clamps to keep stray airflow away... and to contain the air around the temp clamp... thus lowering the difference between the pipe, temp probe in clamp, and surrounding air.

[itsiceman]

Looks like a warm freezer with a ZPTXV that has a MOP.
I think he should just let it pull down to temp and it might need a little tweaking at the evap if anything :.02: