Boots – shoes – and leggings
Patent
1986-03-27
1988-07-05
Lall, Parshotam S.
Boots, shoes, and leggings
62126, 62129, 62149, F25B 4500
Patent
active
047559578
ABSTRACT:
Method and apparatus for servicing air-conditioning systems employing electronic processing means for initially diagnosing the air-conditioning system and, thereafter, if tests or repairs are needed, for guiding the mechanic to correction of its defective operation and for charging the system with refrigerant and oil. The apparatus, according to a preferred embodiment, includes a microprocessor operable in three modes: a "system selection" mode during which the type of system being serviced is identified; a "diagnose" mode during which the microprocessor receives signals indicative of the high and low side pressures of the air-conditioning system and develops a list of possible causes of system malfunction, and a "charging" mode during which the microprocessor automatically charges the system with the desired amount of refrigerant and oil. The apparatus further includes means controlled by the microprocessor for automatically compensating for changes in the viscosity and temperature and, hence, of the flow rate of the oil to ensure the air-conditioning system will always be correctly filled. The invention permits accurate diagnosis and repair to be carried out by relatively inexperienced personnel in a straightforward, efficient manner.
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Training Manual, Automotive Air-Conditioning Basic Service, 1985 Edition, pp. 115-139, White Industries, Inc.
Hancock John
White Daniel
Black Thomas G.
K-White Tools, Incorporated
Lall Parshotam S.
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