Refrigeration – Automatic control – Withdrawing or adding refrigerant from or to normally closed...
Reexamination Certificate
2011-01-11
2011-01-11
Denion, Thomas E (Department: 3748)
Refrigeration
Automatic control
Withdrawing or adding refrigerant from or to normally closed...
C062S129000, C062S209000, C062S127000, C062S210000
Reexamination Certificate
active
07866172
ABSTRACT:
Vapor compression air conditioning systems are provided with a flow restrictor for transferring working fluid to and from at least one of the compressor low pressure inlet conduit and compressor high pressure outlet conduit to provide for accurate charge adjustment to achieve predetermined fluid sub-cooling. Pressure and temperature measurements are taken at a condenser fluid outlet conduit and provided to a microcontroller for determining fluid sub-cooling and comparing sub-cooling with a predetermined target sub-cooling. A charge addition or recovery apparatus may include a solenoid valve controlled by the microcontroller to more accurately control the addition or recovery of refrigerant fluid charge.
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Douglas Jonathan David
Schaefer, Jr. James Thomas
Walters Gregory F.
Brown, Jr. J. Robert
Carton Michael
Conley & Rose, P.C.
Denion Thomas E
Trane International Inc.
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