Air-conditioning dryer

The dryer stores the liquid coolant to ensure a constant flow to the thermostatic expansion valve under widely varying operating conditions.
The dryer contains a desiccant to absorb any moisture from the system.
Any moisture in the air conditioning system is extremely damaging.
Moisture that is not absorbed by the dehydrator circulates with the coolant and droplets can collect in the thermostatic expansion valve and freeze out.
This process blocks the coolant flow and interrupts the cooling effect.
Water vapour also reacts with the coolant to form a corrosive acid.
The desiccant can only absorb a limited amount of moisture before it reaches its saturation point.
For this reason, the desiccant should be replaced after every replacement of system components.