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Old 08-28-2008, 03:55 PM   #1
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installing split system>410


i've installed s/s that had f-22, no problem. was wondering any difference to installing one [precharged] that uses the new f-410??? what is normal lo-side press reading?? thanks

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Old 08-29-2008, 05:10 AM   #2
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installing split system>410


You must mean R-22 and R-410. Not a whole lot of difference in the instal. Normal suction pressure for any refrigerant will vary based on operating conditions. You would want to keep the suction pressure above freezing. After you finish the instal, call a certified tech to do the start up. R-410 has a higher operating pressure than R-22, and requires gauges and hoses that are rated for it.

A precharged system is only a starting point for a system. It does not mean it will perform correctly in every application.

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Old 08-30-2008, 03:41 AM   #3
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installing split system>410


Thanks for the reply. yes, i did mean R-22/410, thank you. i understand applications will vary and 410 requires different gauges but was wondering; as a rule of thumb, if i'm within manf' spec' with line set and btu sizing what would be equivlent reading of low side, r-22 unit runs around 60-65# sweats on lines, cycles good, and cools nicely. in this area most/all reputable tech's don't want to get involved with an install by diy. i repair residential refrigerators but don't do sealed systemns anymore. Thanks.
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Old 08-30-2008, 01:35 PM   #4
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installing split system>410


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Old 08-31-2008, 12:37 PM   #5
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installing split system>410


90 to125psi.
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Old 08-31-2008, 09:00 PM   #6
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installing split system>410


The unit must be charged with superheat and subcool. Pressures vary alot with the conditions and are in no way supposed to be charged to a certain pressure.
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Old 09-06-2008, 06:16 AM   #7
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installing split system>410


Thanks guys for taking the time to respond. if i understand you correctly, i can install a new r410 precharged unit [keeping within manf' specs as to lenght of line set, pulling vac', etc] as easily as i can an r-22 unit. i would use guages only to ascertain that unit was operating within normal press' range. also; are uncertified [EPA] persons allowed to install precharged units?? Thanks.
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Old 09-06-2008, 07:45 AM   #8
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installing split system>410


Yes you can, however, a certfied tech should do the start up not only for warranty purposes, but because you must be certified to handle refrigerant. If the charge is low when its started, and your not certfied your screwed.

If you do quality work, most techs wont mind helping a DIY. Just dont expect to have a lower standard be acceptable to us just because you DIY. We have to do it right...so do you. Do quality work,take the test, get certified. You dont need a universal certification to handle refrigerant, you only need to pass the level that best applies to you.


Last edited by 8 Ball; 09-06-2008 at 07:55 AM.
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