307D, 311D, 312D, 313D, 315D, 318D, 319D, 320D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 340D, 345D, 349D, 374D, 390D and M325D Excavators Air Conditioning and Heating Refrigerant Receiver-Dryer Caterpillar


Refrigerant Receiver-Dryer
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Illustration 1g01129049

(1) Inlet for refrigerant

(2) Outlet for refrigerant

(3) Receiver-dryer

(4) Desiccant

(5) Strainer

(6) Receiver tube

(7) Receiver tank

Receiver-dryer (3) consists of receiver tank (7) , desiccant (4) , strainer (5) and receiver tube (6) .

Receiver tank (7) - The revolution of the compressor varies greatly in response to engine speed. Accordingly, an adequate amount of refrigerant in the cooling circuit varies. Receiver tank (7) receives varying amounts of refrigerant. When the cooling system is not in need of much refrigerant, the remaining refrigerant is temporarily stored in receiver tank (7) . When the cooling system requires additional refrigerant, the receiver tank sends out refrigerant through receiver tube (6) to the cooling tank. Receiver tank (7) also stores an excess amount of refrigerant in order to replenish small amounts of refrigerant that has leaked out of the system. Such leaks are caused by the balance of refrigerant charge or porous rubber hoses.

Desiccant (4) (drying agent) - Moisture in the cooling circuit can cause many problems: deterioration of the compressor, deterioration of the compressor oil, corrosion of metallic components and clogging of the expansion valve. The cooling circuit utilizes synthetic zeolite as a desiccant. The desiccant absorbs moisture that enters the circuit during charging of the system. In the event of a frozen expansion valve, the desiccant is deteriorated. If desiccant (4) is not effective, replace the receiver-dryer.


NOTICE

If the refrigerant system has been open to the outside air (without being plugged) for more than 30 minutes, the receiver-dryer must be replaced. Moisture will enter an open refrigerant system and cause corrosion which will lead to component failure.


Note: Refer to Operation and Maintenance Manual, "Maintenance Interval Schedule" for the proper intervals for replacement .

Strainer (5) - Any amount of dust or debris that enters the cooling circuit causes clogging of the expansion valve. When a refrigerant compressor is failing, debris may be created. The cooling system will not cool adequately. Strainer (5) filters the dust and debris out of the refrigerant. Replace strainer (5) when the strainer becomes clogged.

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