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-   -   R-410a (http://www.diychatroom.com/f17/r-410a-11149/)

rjordan392 08-31-2007 06:26 AM

R-410a
 
Are there pressure guages to measure high and low side pressures just for R410A refrigerant or can a serviceman use guages designed for R22 and automotive refrigerants?
What would the error be if he did?

Rookietinner 08-31-2007 10:48 PM

I have a set of uniweld gauges that work with r-22 and 410a.

rjordan392 09-01-2007 05:39 AM

Thanks,
I had responces in another forum that the oil in R410A is differant then whats in R22 and that they should not be mixed. There seems to be a conflict there. Perhaps the way the gages are hook up and removed prevents any contamination from getting into the compressor; would that be a reasonable assumption?

rojacman 09-01-2007 01:21 PM

jordan yes , the issue of the oils not compatible is valid . The pressures are very different , very much higher , as are the operating head and suction pressures. the manifolds and hoses are of different construction . Please get certified in 410a uses b/4 trying to use it. high side guages go up to 800 psi. We automatically change linesets when using 410 to aviod any problems. Good luck Jack:thumbup:

rjordan392 09-01-2007 02:30 PM

Thanks,
I will not be handling the refrigerant. I am just aquiring information to make sure that the people I hire are using correct procedures.

Buckeyetech 09-01-2007 06:07 PM

The combination R-22 and 410A guages are convenient, but the accuracy may not be good.

Go Bucks

rjordan392 09-01-2007 07:33 PM

Thanks.
While I have your attention, whats your opinion on using a Mason's hygrometer as a calibrating tool to set correct humidity readings on a thermostat. It has a dry and wet bulb spirit thermometers and I usually direct a flow of air towards it to give somewhere near 500 feet a minute to promote evaporation. Thats part of the directions in its use.

Buckeyetech 09-01-2007 09:13 PM

I've never used a Mason Hygrometer. I'm now using a Fluke #971 but I can't think of a stat that we have around here that needs the humidity set, but any good hygrometer should do the job.

rjordan392 09-01-2007 09:43 PM

I am not even sure it makes a differance as it may just be a monitor on the stat. But on the other hand, I can program the desired humidity level and the stat may be influence by the monitor reading. This is why I calibrated it to cover myself.


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