Loss of Freon When Checking Subcooling Superheat ??
When a technician is testing the charge level or subcooling or superheat, and is using gauges with hoses that are several feet long, how much Freon is lost from filling up the hoses? Should the technician have a canister of Freon with him to replace what is lost when he completes his system check? Thanks.
With low loss fittings and proper techniques you won't lose enough to make a difference with regular service. Should they put more in just because they hooked up? No. The amount you are talking about is not readily measurable, so all they would do is screw the charge up.
Be careful, many of the techs on this site and many in the field use one set of gauges for all residential refrigerant types. Which means they dump the charges on their gauges after each use. If your system is near critical and the tech has 6 foot hoses it could affect system performance.
I STARTED WITH NOTHING, AND I STILL HAVE MOST OF IT!
Be careful, many of the techs on this site and many in the field use one set of gauges for all residential refrigerant types. Which means they dump the charges on their gauges after each use. If your system is near critical and the tech has 6 foot hoses it could affect system performance.
(cough)
Bull****
Please explain to this group what you mean by "critical charge" on a residential unit and how loosing less than on ounce of refrigerant will matter.
Be careful, many of the techs on this site and many in the field use one set of gauges for all residential refrigerant types. Which means they dump the charges on their gauges after each use. If your system is near critical and the tech has 6 foot hoses it could affect system performance.
I dump the charge from my hoses after every check. Matter of fact I disconnect from the high side of the equipment first, open the high side of the guage to the crossover and then slowly open the low side of the guage to the crossover. IE: I put what liquid I took out of the system right back in. The only thing thing left in my guage set when im done is whatever gas it'll hold at the pressure of the low side. Anyone ever measured how much that is? Oh........ I run 5' hoses if someone is going to do the measurement.
Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.
I said to be careful. I now all you amazing techs out there, like myself, dump your charge back into the system on the low side. Or I have a set of gauges for 410 and 22 with low loss fittings and valves, the best method IMO.
There are however techs out there who don't and you lose a oz. or 2 every-time they hook up. Over time that adds up, and the last tech to hook up could be the one that drops that charge just enough to make a noticeable difference.
The odds on this happening are small, so I will back down.
I was trying to be technical and I will never do it again.
I STARTED WITH NOTHING, AND I STILL HAVE MOST OF IT!
Originally Posted by emoney1971
