He didn't know the difference between Zeroing and calibrating

[Zeiss Nut]

http://www.youtube.com/watch?v=XnTRB...eature=related

I left a comment but it has to be approved by him to be shown.
Make me thinking about making a video on how to calibrate gauge instead of zeroing.

[monkeyspanners]

I don't think you can calibrate mechanical gauges, you can zero them, or set them to read, say 80psi, but the calibration is down to the mechanism and its state of repair.

If they are not reasonably accurate across their scale its time for replacement.

[Zeiss Nut]

I don't think you can calibrate mechanical gauges, you can zero them, or set them to read, say 80psi, but the calibration is down to the mechanism and its state of repair.

If they are not reasonably accurate across their scale its time for replacement.

You are right.
there is no way i could ensure the calibration across the scale.

but my method is : tape a temperature probe to jug side and insulate the jugs. leave the jugs in a room that has pretty stable room temperature for about 24 hours or so.
Hook the gauge to it and calibrate the gauge to the corresponding P/T chart.

this will at least give me the confidence that the gauge is accurate at that particular pressure.

[Six]

Meh.....
That isn't up to par with whats typically posted on the Wall of Shame.

Technically not correct but it's really no big deal

[TriplePoint]

He posted your comment and said thanks for clarifying. :thumbup:

JASON sent this from his DUMB-PHONE

[Juan Madera]

Put refrigerant jug (your choice of flavors) in ice, let it mellow a while and then check that the pressure reflects the 32F saturated vapor on your gauges!

Melting ice is always 32F, or at least close enough for analog gauges.............

[amd]

This video is far worse: http://www.youtube.com/watch?v=fNxQX4EIyjI&feature=plcp

"Kung Fu Maintenance demonstrates how to charge an air conditioner through the suction side only by feel."

[local 392]

Haven't you ever heard of the beer can cold method of charging. It's the latest way of doing it.I think he would have been alot better off drinking that water rather than pouring it over a compressor that is running. Maybe that is how it is done on his planet.

[amd]

He advocates only checking the low side, as if all problems are caused by not enough gas. Restriction or underfeeding txv? Better dump some gas in.

How widespread is that practice?

[KB Cool]

This video is far worse: http://www.youtube.com/watch?v=fNxQX4EIyjI&feature=plcp

"Kung Fu Maintenance demonstrates how to charge an air conditioner through the suction side only by feel."

And then folows it up with a can of super seal

[mark beiser]

And then folows it up with a can of super seal

And Zerol Ice!

[AtticAce]

Now hold on who do you think teaches hacks? Right, the Hackmeister.

You Tube has created an online Hack University.

I took an extra 15 pounds of R-22 out of a unit that holds 14 pounds. The other guy also used the touchy feelie suction only charging method. He was confused on a subsequent call as to why the 40 amp breaker was tripping sometimes on start up, so a 60 amp breaker fixed that problem, but then the points on the contactor blew off three times.

So this obviously meant the 2 year old unit needed to be replaced, mostly because he told her it already had a hard wired start cap and relay and they are the best or some such smoke and mirrors get out the door with a check explanation.

I found a partially blocked liquid dryer at the air handler the frost was a dead give away.

I am going to put up some video's under the handle Kung Po hvac.

[amd]

You Tube has created an online Hack University.

There are some excellent youtube hvac channels, but they're probably outnumbered by the bad ones.