R-22 replacements: R421, R422b, R422d, nu22, R22a

 
Thread Tools Search this Thread Display Modes
Old 06-24-2013, 08:35 PM   #1
Junior Member
 
Tony2218's Avatar
 
Trade: HVAC Repair
Join Date: Jun 2013
Posts: 6
Default

R-22 replacements: R421, R422b, R422d, nu22, R22a


I have recently started researching some R-22 replacements, but have received mixed reviews. So far the Mfg says r421 is the most efficient substitute. R422 b and d are also a good substitute and can be dropped in or added to r22. Nu22 and r22a are Eco friendly and can also be dropped on or added to R22. I spoke with a Manufacturing Engineer who has tested the Nu22 and r22a and said that they had a very slight loss of efficiency. Does anyone know some facts they can contribute. I am getting ready to use the 422d ($230 for 25#), but I am hesitant to add on to R-22. Figured I would recover the R22 first and charge with R422d. Any thought?

Tony2218 is offline  
Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. HVACSite.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

Old 06-24-2013, 08:43 PM   #2
Junior Member
 
Tony2218's Avatar
 
Trade: HVAC Repair
Join Date: Jun 2013
Posts: 6
Default

Re: R-22 replacements: R421, R422b, R422d, nu22, R22a


Other note: frostycool is selling r22a at $140. That is hard to beat if Otis efficient and can be dropped in,
Tony2218 is offline  
Old 07-04-2013, 11:31 AM   #3
Senior Member
 
beenthere's Avatar
 
Trade: Service/Installation
Join Date: May 2009
Posts: 857
Default

Re: R-22 replacements: R421, R422b, R422d, nu22, R22a


Quote:
Originally Posted by Tony2218 View Post
Other note: frostycool is selling r22a at $140. That is hard to beat if Otis efficient and can be dropped in,
Considering its not approved for use in the USA on systems that contain more then 5 ounces. If your in the USA, don't use it.
__________________
How many times must one fix something before it is fixed?
beenthere is offline  
Old 07-06-2013, 03:19 AM   #4
Junior Member
 
ThatHVACguy's Avatar
 
Trade: HVAC and Plumbing
Join Date: Jul 2013
Location: idaho falls, id
Posts: 6
Default

Re: R-22 replacements: R421, R422b, R422d, nu22, R22a


Just my 2 cents... If you are worried about effiency then the why are we talking about an R22 system?
ThatHVACguy is offline  
Old 07-09-2013, 08:59 AM   #5
Junior Member
 
Tony2218's Avatar
 
Trade: HVAC Repair
Join Date: Jun 2013
Posts: 6
Default

Re: R-22 replacements: R421, R422b, R422d, nu22, R22a


I have a bunch of rental property that have r22 systems and would not be economical to change them out.
Tony2218 is offline  
Old 07-11-2013, 06:05 PM   #6
Junior Member
 
PenguinAir's Avatar
 
Trade: Heating, Ventilation, Air Conditioning, and Refrigeration
Join Date: Apr 2013
Location: Tempe, Arizona
Posts: 3
Default

Re: R-22 replacements: R421, R422b, R422d, nu22, R22a


R422D has been known to have issues at medium to low temperatures, so if you're somewhere that it gets chilly I wouldn't recommend it, and I would just say go with Nu-22b, it's a consistent product, and when those units need to be replaced you can get something with a little more efficiency.
PenguinAir is offline  
Old 07-22-2013, 11:20 AM   #7
Junior Member
 
Tony2218's Avatar
 
Trade: HVAC Repair
Join Date: Jun 2013
Posts: 6
Default

Re: R-22 replacements: R421, R422b, R422d, nu22, R22a


Thanks for the input. I purchased the 422d but have been apprehensive to use it yet u til I have all the info. I am in GA, where it doesn't get to cold.
Tony2218 is offline  
Old 07-22-2013, 11:48 PM   #8
Junior Member
 
WyrTwister's Avatar
 
Trade: Electrician
Join Date: Jul 2013
Posts: 13
Default

Re: R-22 replacements: R421, R422b, R422d, nu22, R22a


Quote:
Originally Posted by Tony2218 View Post
Other note: frostycool is selling r22a at $140. That is hard to beat if Otis efficient and can be dropped in,

Is that the propane and / or butane stuff ?

God bless
Wyr
WyrTwister is offline  
Old 10-10-2013, 11:00 AM   #9
Junior Member
 
coolingitrite's Avatar
 
Trade: hvac
Join Date: Oct 2013
Location: south jersey
Posts: 11
Default

Re: R-22 replacements: R421, R422b, R422d, nu22, R22a


hec with this crap. we should send a bunch of evaporators into space and run the ductwork down to earth.. then we can use water as a refrigerant

its all crap.

if 410 is ozone friendly, why can't we vent it.. keep the 22.. I am half way to death anyways.. got about 25 good more years .
coolingitrite is offline  
Old 10-10-2013, 11:14 AM   #10
Junior Member
 
WyrTwister's Avatar
 
Trade: Electrician
Join Date: Jul 2013
Posts: 13
Default

Re: R-22 replacements: R421, R422b, R422d, nu22, R22a


Quote:
Originally Posted by coolingitrite View Post
hec with this crap. we should send a bunch of evaporators into space and run the ductwork down to earth.. then we can use water as a refrigerant

its all crap.

if 410 is ozone friendly, why can't we vent it.. keep the 22.. I am half way to death anyways.. got about 25 good more years .

If I had to bet , I would say the ozone hole and global warming are a scam .

God bless
Wyr
WyrTwister is offline  
Old 10-10-2013, 05:24 PM   #11
Senior Member
 
beenthere's Avatar
 
Trade: Service/Installation
Join Date: May 2009
Posts: 857
Default

Re: R-22 replacements: R421, R422b, R422d, nu22, R22a


Quote:
Originally Posted by coolingitrite View Post
hec with this crap. we should send a bunch of evaporators into space and run the ductwork down to earth.. then we can use water as a refrigerant

its all crap.

if 410 is ozone friendly, why can't we vent it.. keep the 22.. I am half way to death anyways.. got about 25 good more years .
Only because the EPA made the reg that says no venting of refrigerants. Same as you are not allowed to vent R134A. R410A wasn't even invented when the no venting regs came out.
__________________
How many times must one fix something before it is fixed?
beenthere is offline  
Old 01-26-2014, 02:35 PM   #12
Junior Member
 
wetbar's Avatar
 
Trade: hvac
Join Date: Jun 2012
Location: North Carolina
Posts: 13
Default

Re: R-22 replacements: R421, R422b, R422d, nu22, R22a


I know this thread is old, but had one question. Tony said "Nu22 and r22a are Eco friendly and can also be dropped on or added to R22." I didnt think you could add nu22 to an R-22 system. So I don't have to recover and pull a vac and start clean?
wetbar is offline  
Old 02-02-2014, 07:26 AM   #13
Senior Member
 
beenthere's Avatar
 
Trade: Service/Installation
Join Date: May 2009
Posts: 857
Default

Re: R-22 replacements: R421, R422b, R422d, nu22, R22a


Don't mix refrigerants. You end up with unknown saturation temps.
__________________
How many times must one fix something before it is fixed?
beenthere is offline  


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?


SEO by vBSEO 3.6.1