Figure 13-22.Typical refrigerant recycling recovery device.
refrigerant; for example, the flame type of leak detector
will not function, and your recovery, recycling systems
(fig. 13-22) must be kept separate and not allowed to
contaminate each other.
The components of the system also have some
differences. Hoses of an R-12 system will not withstand
the chemicals in a system using R-134A. Also, the
lubrication oils are not compatible and must not be
Finally, to reduce the chances of a mix-up of parts,
the threaded fittings of the new system components are
purposely incompatible with the old.
The chance of a military shop having to convert an
R-12 system to a R-134A system is slim. The
information here is to make you aware of the changes
Now, we will simply say do not mix refrigerants,
With all the changes in the air-conditioning industry,
there are some refrigerants on the market that are not
compatible with either system. These refrigerants are
merely blends of existing refrigerants and, in some
cases, are highly flammable. In other cases, these blend
refrigerants may break down the desiccant in the
receiver/drier and pass the debris into the rest of the
system, clogging the expansion valve/orifice tube and
possibly ruining the compressor.
DO NOT use any of these so-called blend
refrigerants. For that matter, DO NOT manufacture your
own adapters to cross match an R-12 to an R-134A
system. You will only contaminate the system and cause
damage to your equipment. Once again DO NOT mix
Most states require or, before long, will require
mechanic certification when working with automotive
When possible, recycle uncontaminated R-12 or
R-134A for reuse. Return excess uncontaminated
refrigerants to DRMO for disposition and disposal.
Remember, any refrigerant blend is unusable and you
should turn it in to DRMO, under applicable naval
station instructions, as hazardous waste.
Extension Course Institute, Air University, AFSC
47252, General Purpose Vehicle Mechanic, Gunter
Air Force Station, Montgomery, Ala., 1985.
Gousha, H. M., Car Service Manual, A Chek Chart
Publication, Simon and Shuster Inc., San Jose,
Motor Magazine, Volume 177, Number 6, Hearst
Publishing Co., New York, 1992.