Maintaining Chemical Stability

Maintaining Chemical Stability

The chemical stability of the refrigeration system plays an important role in the efficient operation and longevity of the A/C system.

When air, moisture or particulate contamination are introduced into the refrigeration system, the following results will occur:
^ The chemical stability of R-134a and Polyalkylene Glycol (PAG) synthetic lubricant will change. The pressure/temperature symmetry will change.
^ The A/C system efficiency will be diminished.
^ Internal A/C system parts may corrode and/or wear in an abnormal manner.
Use the following general practices to maintain chemical stability in the refrigeration system:
^ Wipe away dirt and/or oil before you break a refrigerant connection. This will reduce the possibility of particulate contamination.
^ Cap, plug or tape both sides of an open connection as soon as possible. This will minimize the amount of dirt and moisture entering the system.
Ensure that the following remain clean and dry:
- The tools being used for the repair
- The surrounding area of the repair
- The hoses and connectors for the ACR4 machine or manifold gage set
- The replacement parts
^ When adding polyalkylene glycol (PAG) lubricant, ensure the transfer device and the container remain clean and dry to minimize moisture intrusion.
^ Do not leave the A/C system open any longer than necessary.
^ Before recharging an A/C system that has been opened, properly evacuate and vacuum test the system.
^ Service parts are dehydrated and sealed prior to shipping. Retain the parts in their sealed packages until you are ready to use them.
^ Ensure the parts are at room temperature before opening the packages. This prevents condensation on the parts from humidity in the atmosphere.
^ Attach the A/C service equipment quick-connects as soon as possible after removing the service caps.