Expansion device with low refrigerant charge monitoring

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

F - Mech Eng,Light,Heat,Weapons

25

B

F25B 49/00 (2006.01)

Patent

CA 2540033

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.

La présente invention concerne un système de réfrigération ou de climatisation comprenant un dispositif d'expansion capable de plusieurs positions de fonctionnement. Lorsque le dispositif est grand ouvert, il donne une indication de cette position à un contrôleur système. En réaction, le contrôleur recherche si l'ouverture en grand du dispositif provient d'un niveau faible de la charge de réfrigérant dans le système. Dans un cas, le contrôleur élimine toutes les autres raisons d'ouverture en grand du dispositif d'expansion. Dans un autre cas, le contrôleur arrête automatiquement les éléments appropriés du système pour éviter d'endommager des composants par manque ou insuffisance de réfrigérant dans le système.

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