Refrigeration – With indicator or tester – Operatively correlated with automatic control
Patent
1993-12-30
1994-12-06
Tanner, Harry B.
Refrigeration
With indicator or tester
Operatively correlated with automatic control
62129, 62229, 236 91F, F25B 4902
Patent
active
053699572
ABSTRACT:
Methods and apparatus for checking the position and condition of a return air temperature sensor in a refrigeration system. The refrigeration system draws air from a served space in heat exchange relation with an evaporator coil, and discharges conditioned air into the served space, to maintain a predetermined set point temperature SP via selectable refrigeration cycles. The return air sensor provides a value RA responsive to the temperature of the air on the return side of the evaporator coil. A discharge air temperature sensor provides a value DA responsive to the temperature of the air on the discharge side of the evaporator coil, an evaporator coil temperature sensor provides a value ECT responsive to the temperature of the evaporator coil, and an ambient air temperature sensor provides a value AA responsive to the temperature of the ambient air. A dynamic constant C1 responsive to the AA and to the selected refrigeration cycle is provided, and a difference value D responsive to the difference between RA and ECT is determined. D and C1 are compared, and it is determined if DA and ECT indicate a stable operating condition of the selected refrigeration cycle. An alarm is provided which indicates that the return air temperature sensor should be checked when D exceeds C1 during a stable operating condition of the selected refrigeration cycle.
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Panian M. G.
Tanner Harry B.
Thermo King Corporation
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