huh?
what so differant about R-22?

 

r-22 is a very heavy gas used in household air conditioning.

 

save your self a headache use rb-276



APPLICATIONS
...
FREE ZONE RB-276 refrigerant is formulated to match the thermodynamic properties and operating characteristics of R-12; it is designed to facilitate a "Quick Change" which does not require any retrofit parts, (except EPA required
service port fittings) adjustments or system flushes.
. <CENTER>CHEMICAL PROPERTIES
.
134a (1,1,1,2-tettrafluorethane) 79.0%
142b (1-chloro-1, 1-difluoroethane) 19.0%
Napthenic (hydrophobic) lubricant 2.0 %</CENTER><HR width="100%">

PHYSICAL AND CHEMICAL PROPERTIES
. <CENTER><TABLE cols=3 width="90%"><TBODY><TR><TD>PROPERTY</TD><TD>VALUE</TD><TD>UNITS</TD></TR><TR><TD>Molecular Mass</TD><TD>101.72</TD><TD>Grams/Mole</TD></TR><TR><TD>Component Mole Fraction </TD><TD>79.8/20.2</TD><TD>134a/142b</TD></TR><TR><TD>Bubble Point Temperature</TD><TD>-23.5/-10.3 </TD><TD>°C/°F</TD></TR><TR><TD>Dew Point Temperature</TD><TD>-21.6/-10.3</TD><TD>°C/°F</TD></TR><TR><TD>Maximum Temperature Glide </TD><TD>1.9 </TD><TD>°C</TD></TR><TR><TD>Saturated Vapor Pressure </TD><TD>477.9
69.3 </TD><TD>KPA
PSIA</TD></TR><TR><TD>Critical Temperature</TD><TD>117.9/244.2 </TD><TD>°C/°F</TD></TR><TR><TD>GWP (Global Warming Potential) </TD><TD>1440, as compared to </TD><TD>CO<SUB>2</SUB></TD></TR><TR><TD>ODP (Ozone Depletion Potential)</TD><TD>0.01, mole weighted average</TD><TD></TD></TR><TR><TD>Flammability </TD><TD>None, ASTM E-683, </TD><TD>CSMA Flame</TD></TR><TR><TD>Flash Point</TD><TD>None, closed cup "Seta Flash"</TD><TD></TD></TR><TR><TD>Flammable Limits in Air </TD><TD>None</TD><TD></TD></TR><TR><TD> Liquid Density</TD><TD>1.23</TD><TD>70°F</TD></TR><TR><TD vAlign=top align=left>Vapor Density (Lb/ft<SUP>3</SUP>)</TD><TD>1.53
3.92 </TD><TD>70°F
130°F</TD></TR><TR><TD vAlign=top align=left>Vapor Pressure </TD><TD>67.4 psig
183.3 psig </TD><TD>70°F
130°F</TD></TR><TR><TD vAlign=top align=left>Temperature Glide</TD><TD>2.0 degrees
2.3 degrees</TD><TD>130°F
70°F</TD></TR></TBODY></TABLE></CENTER><HR width="100%">

 

here is a pressure tem<TABLE width="50%" border=1><TBODY><TR><TD></TD></TR></TBODY></TABLE>p chart that shows just how close rb-276 is to r-12

 

I will be useing RB-276. RB-276 is the #1 replacement for R-12 in the future. Call the people at HECO (makers of FreeZone) and ask if there is someone near you that installs Freezone.