Requesting a litle advice - ac correct r22 charge.

[Jersey ED]

Recently we had a new York furnace and evaporator coil (with txv) installed to replace aging units. We had it installed when it was still quite cold outside and I have a question regarding the freon R22 charge which was set after the coil was installed. The tech simply checked the charge by adjusting it to suction 65psi. I feel he should have set the charge by using the subcool method. I believe the outside temperature on the installation day was about 60 degrees. Should I insist that they come back to recheck the charge or is their "rule of thumb" method really good enough and to be trusted/accepted? The 65 degrees suction pressure is approx. 38 degrees at the evap coil, but is the system going to perform as it should?
Thanks for your input!

[Jay 41]

I didn't know there was a rule of thumb, you might want to invite him back over.

[beenthere]

They just guessed based on whatever.
It should be checked by SC, SH, and temp drop across the coil.

[Jay 41]

They just guessed based on whatever.
It should be checked by SC, SH, and temp drop across the coil.

Does rule of thumb mean, if you put your thumb on the big line and it's cold, you're O.K.?

[iraqveteran]

Does rule of thumb mean, if you put your thumb on the big line and it's cold, you're O.K.?

no.

rule of thumb is two fold. You use your left thumb to check return air and right thumb to check supply air. Once done, return left thumb to arse and return right thumb to mouth. Be sure you do the L test before returning thumbs!!

rule of beer states beer can cold is proper operatin levels for the cold stuff

rule of wave states wave your hand in front of register. If you feel air coming out, you have proper CFM.



And the final rule.......


If the customer is happy, I'm haulin arse before they change their mind!!!!

[Jay 41]

no.

rule of thumb is two fold. You use your left thumb to check return air and right thumb to check supply air. Once done, return left thumb to arse and return right thumb to mouth. Be sure you do the L test before returning thumbs!!

rule of beer states beer can cold is proper operatin levels for the cold stuff

rule of wave states wave your hand in front of register. If you feel air coming out, you have proper CFM.



And the final rule.......


If the customer is happy, I'm haulin arse before they change their mind!!!!

Nice, very nice, thanks for the in depth answer.lol

[I_bend_metal]

Here's the formula he was using....


Outdoor Ambient
(minus)
Indoor Wetbulb
(plus)
Physical weight of unit
(plus)
Ounces in a 12 pack
(minus)
Technician's I.Q.

Equals 65




Just call him back and make him do it right.

[tinknocker service tech]

call them and get it checked

that is not how to ajust anything and you may even be over charged