Apparatus with method and means for diagnosing failure of a pres

Details Apparatus with method and means for diagnosing failure of a pres Apparatus with method and means for diagnosing failure of a pres

1987-08-13

1989-07-18

Tanner, Harry B.

Refrigeration

With indicator or tester

Operatively correlated with automatic control

62129, 622283, F25B 4900

Patent

active

048480967

ABSTRACT:
A refrigeration systems diagnoses its pressure sensors by turning the system off, determining whether the pressure sensors on the high-pressure-side and on the low-pressure-side of a refrigeration circuit detect unvarying pressures, and comparing the pressure values detected by a high pressure sensor and a low pressure sensor with each other. The high pressure sensor or the low pressure sensor is regarded as defective when the difference between the two pressures detected falls outside a tolerance range. In one embodiment an analyzer compares the pressures to produce a signal indicating failure when the pressure difference falls outside the tolerance range.

REFERENCES:
patent: 4106306 (1978-08-01), Saunders
patent: 4122720 (1978-10-01), Podl
patent: 4337516 (1982-06-01), Murphy et al.
patent: 4381549 (1983-04-01), Stamp, Jr. et al.
patent: 4602484 (1986-07-01), Bendikson
patent: 4653280 (1987-03-01), Hansen et al.

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