Expansion device with low refrigerant charge monitoring

Details Expansion device with low refrigerant charge monitoring Expansion device with low refrigerant charge monitoring

2005-11-15

2005-11-15

Tanner, Harry B. (Department: 3744)

Refrigeration

With indicator or tester

Condition sensing

C062S131000

Reexamination Certificate

active

06964173

ABSTRACT:
An air conditioning or refrigeration system includes an expansion device that has a plurality of operating positions. When the expansion device is in a fully open position, the expansion device provides an indication to a system controller regarding that position. The controller responsively determines if the fully open position of the expansion device is caused by an undesirably low amount of refrigerant charge in the system. In one example, the controller rules out other possible reasons for the expansion device being in the fully open position. In one example, the controller automatically shuts down appropriate portions of the system to avoid any component damage that may result from having too low refrigerant amount in the system.

REFERENCES:
patent: 4876859 (1989-10-01), Kitamoto
patent: 5241833 (1993-09-01), Ohkoshi
patent: 5243829 (1993-09-01), Bessler
patent: 5623834 (1997-04-01), Bahel et al.
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patent: 6460354 (2002-10-01), Yabuki et al.
Systems & Advanced Technologies Engineering S.r.I., publication entitled “Compsys-Dynamic Simulation of Gas Compression Plants”.
Copeland Application Guideline for Refrigeration Scroll for Parallel Applications.
International Search Report, Apr. 6, 2005.

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