New Holland CX720 Repair Manual page 3043

BODY AND STRUCTURE - ENVIRONMENT CONTROL Air-conditioning system
Receiver/drier - Static description (E.40.C.35 - C.30.A.20)
Receiver/Dryer Description
The receiver/drier, located on the right side of the engine compartment is a storage tank that receives the high-pres-
sure liquid refrigerant from the condenser through an inlet line.
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A sight glass (1) is installed so that the general condition of the refrigerant charge can be determined. The decision to
add refrigerant should not be based on the indication of the sight glass alone. Perform the appropriate steps described
in ENVIRONMENT CONTROL Air-conditioning system - Service instruction (E.40.C - F.10.A.05).
A moisture indicator (2) is provided on the drier. A blue color indicates that the drier is in satisfactory condition. When
the drier is saturated with moisture, the indicator will be pink. The drier section contains a desiccant to absorb mois-
ture but can only absorb a limited amount of moisture before reaching a saturation point. The ability to retain moisture
absorbed is dependent upon temperature. As the outside temperature increases, the ability to retain absorbed mois-
ture decreases. This is why an air conditioning system with a saturated drier may operate satisfactorily when outside
temperatures are low, but stop cooling when the temperature increases.
The refrigerant exits the receiver/drier through an outlet connection and flows to the thermostatic expansion valve.
NOTE: Any moisture in the air conditioning system is extremely harmful. Moisture not absorbed by the drier will
circulate with the refrigerant. Droplets may collect and freeze in the thermostatic expansion valve restricting refrigerant
flow. The moisture circulating in the system may also react with the refrigerant to form hydrochloric acid.
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