Refrigeration – With indicator or tester – Condition sensing
Patent
1996-09-12
1997-11-25
Tanner, Harry B.
Refrigeration
With indicator or tester
Condition sensing
62204, 622283, F25B 4902
Patent
active
056899637
ABSTRACT:
Compressor discharge temperature, ambient outdoor air temperature and thermal load are used as control parameters for controlling the expansion valve setting and indoor fan speed. Diagnostics monitor a feedback signal from the fan motor to detect fan over-speed and increased speed due to decreased air flow caused by a dirty indoor air filter. Discharge pressure of the compressor is monitored to detect a blocked outdoor fan. The difference between actual and optimum compressor discharge temperatures and suction pressure of the compressor are monitored to detect a stuck-closed expansion valve or low refrigerant charge. Compressor "short-cycling" is limited to prevent reduced reliability of the compressor. The difference between compressor discharge temperature and outdoor coil temperature is measured before and after startup to detect compressor failure.
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Bahel Vijay
Greschl Gerald L.
Herroon Gregory P.
Hickey Mickey
Millet Hank
Copeland Corporation
Tanner Harry B.
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