Refrigerating circuit device for air conditioning apparatus and

Details Refrigerating circuit device for air conditioning apparatus and Refrigerating circuit device for air conditioning apparatus and

1988-04-19

1989-07-25

Tanner, Harry B.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62158, 62227, 622284, 62229, F25D 2106, F25B 100

Patent

active

048502006

ABSTRACT:
When the temperature of an internal heat-exchanger decreases below a first value in cooling mode, a normal operation, wherein a variable capacity compressor operates in response to the temperature in a space to be cooled, stops temporarily, and a defrost operation, in which the driving frequency of the compressor periodically decreases by a prescribed value until the temperature of the internal heat-exchanger increases above a second value greater than the first value, begins. When the temperature of the internal heat-exchanger increases above a second value greater than the first value, the compressor operates in response to the temperature in the space. When the compressor stops during the defrost operation, the temperature of the internal heat-exchanger is compared with a third value greater than the second value and the operation of the compressor responding to the temperature in the space is inhibited until the temperature of the internal heat-exchanger increases above the third value. When the temperature of the internal heat-exchanger increases above the third value, the compressor operates in response to the temperature in the space. This control operation may prevent the frost from being left on the internal heat-exchanger when the normal operation starts again.

REFERENCES:
patent: 4535607 (1985-08-01), Mount
patent: 4537042 (1985-08-01), Nishi et al.
patent: 4604872 (1986-08-01), Miyazaki et al.

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