King valve - does it require cooling when brazing

[rogressem]

Another observation when my evaporator was replaced. King valve at the condenser had no cooling when the filter dryer was brazed in, but he did do a good job of cooling the TXV. Whats the best practice on king valves when brazing - cooling required or not?

I've also since learned that the filter dryer really should have been installed up at the evaporator. Reason for re-installing at the condenser was "because thats where the old one was".

[carmon]

no reason to install at evaporator...thats a load of bull.... cooling the valve depends on the torch... and how fast it was done... and how close drier was....

[Southern Mech]

Actually, we in ocean side resort areas install them @ the evap. I have replaced so many rotted dryers from salt corrosion... That was until the copper spun dryers came out. Other than that it doesnt matter the placement of the dryer...as long as there is one.

On the king valve, I have never cooled them while brazing, I will cool after though

[carmon]

GOOD POINT..... I can understand putting it inside under those conditions..... serves same purpose inside or out though.....

[catmanacman]

Its good practice to wrap the valve with a wet rag before brazing surely wont hurt any thing on the drier as long as it has one

[cuchulain]

actually it's bad to put the drier up at the evaporator in a hot attic environment. One purpose of the DRIER is to dry the refrigerant (capture any moisture not pulled out during a vacuum). If that drier is up in an attic where the temps are above the evaporation point of water. Well guess what. the moisture that he drier has captured suddenly evaporates and is pushed back into the system. And yes I'm in an excessively corrosive environment, and yes we do see driers up in the attic. But it's not the best place for them.

[hvac-learning]

I`ve used this stuff called Hot Damn . It`s red in color and reuseable , it will keep the heat from destroying valves and TXV`s

[vstech]

The sporlan txv rep recommended dryers be placed as close to the txv as possible for best protection of the txv. he also strongly advised good nitrogen flow during brazing, and a proper micron test during evacuation to eliminate any traces of moisture before charging. also that the dryer be of solid core type, not the bead style of dryer.

[udarrell]

The sporlan txv rep recommended dryers be placed as close to the txv as possible for best protection of the txv. he also strongly advised good nitrogen flow during brazing, and a proper micron test during evacuation to eliminate any traces of moisture before charging. also that the dryer be of solid core type, not the bead style of dryer.

Good advice.

All air handlers &/or furnaces are not installed in attics; in WI they are normally in the basement; I wish there were none installed in attics anywhere...

[Failure2Comply]

A "King Valve" is the liquid line shut off valve at a receiver tank. A liquid line service valve is what you find on outdoor units. I ALWAYS wrap and cool with water ANY valve that I solder in, or very close to.

[hvac wiz 79]

I`ve used this stuff called Hot Damn . It`s red in color and reuseable , it will keep the heat from destroying valves and TXV`s

I just heard about that stuff recently myself. I'm looking to try some

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