The life and efficient operation of the air conditioning system
depends upon the chemical stability of the refrigerant system. When foreign
materials, such as dirt, air or moisture, contaminate the refrigeration
system, the following conditions may result:
| • | Changes in the stability of R-134a and polyalkaline gylcol (PAG)
refrigerant oil |
| • | Changes in the pressure-temperature relationship |
| • | Reduced efficiency of the system |
| • | Abnormal wear of moving parts |
Use the following general practices in order to ensure chemical stability
in the system:
| • | Whenever a hose connection is disconnected, wipe away any dirt
or oil at or near the connection. This action eliminates the possibility of
dirt entering the system. |
| • | Cap, plug or tape both sides of the connection as soon as possible
in order to prevent the entrance of dirt and moisture. (Remember that air
contains moisture. Air that enters any part of the refrigeration system
will carry moisture with it. The exposed surface will collect the moisture
quickly. |
| • | Keep the tools clean and dry. This includes the Manifold Gage
Set and all of the replacement parts. |
| • | When adding polyalkaline glycol (PAG) refrigerant oil, ensure
that the container/transfer tube through which the oil will flow is exceptionally
clean and dry. Refrigerant oil must be as moisture-free as possible. |
| • | When opening an air conditioning system, have everything needed
ready so that as little time as possible is used to perform the operation.
Do not leave the air conditioning system open to the atmosphere any longer
than necessary. |
| • | Any time that the air conditioning system has been opened, properly
evacuate the air conditioning system before recharging the system. |
