Why Replace the Receiver-Drier?

Why Replace the Receiver-Drier?
The receiver-drier must be changed each time a system is empty regardless of the reason for loss of refrigerant.
The receiver-drier is strictly a disposable item and is thought of in the same terms as a fuel, oil, or air filter. In fact, if any component fails or is replaced for any reason, the receiver-drier must also be replaced to prevent corrosion and moisture in the system.

The receiver-drier performs three functions:
1. It filters the system of non-condensables.
2. It receives the liquid refrigerant and maintains a certain level of liquid at the bottom at all times in a properly charged system.
3. It contains a stack of pellets called desiccant (drying agent) to trap and absorb moisture.
NOTE that moisture is the most harmful enemy of the air conditioning system. If any moisture is in the system, it will combine with the refrigerant to form hydrochloric acid which is extremely corrosive to metal components.

Replacing the receiver-drier is essential when servicing the A/C system. Whenever you replace a component of the A/C system you must also replace the receiver-drier. If you do not change the receiver-drier there could be serious damage to the other parts of the system, which could be very costly. You must also have proof of changing the receiver-drier in order to receive a compressor warranty.

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