Refrigerating apparatus

A refrigerating apparatus comprising:

• a refrigerating cycle having compressors, a condenser, a liquid receiver, expansion valves and evaporators;
• and
• a suction pressure sensor for detecting a pressure on suction sides of the compressors;
• wherein when the suction pressure has at least a capacity-up pressure value, it causes an increase in the number of compressors being operated or the operating frequency;
• and when the suction pressure has at most a capacity-down pressure value, it causes reduction in the number of compressors being operated or the operating frequency;
• and
• wherein when a rate of a change in the suction pressure is larger than a predetermined value, at least one of the capacity-up pressure value and the capacity-down pressure value is made larger than said each pressure value.

A refrigerating apparatus comprising:

• a refrigerating cycle having compressors, a condenser, a liquid receiver, expansion valves and evaporators;
• and
• a suction pressure sensor for detecting a pressure on suction sides of the compressors;
• wherein when the suction pressure has at least a capacity-up pressure value, it causes an increase in the number of compressors being operated or the operating frequency;
• and when the suction pressure has at most a capacity-down pressure value, it causes reduction in the number of compressors being operated or the operating frequency;
• wherein the compressors are plural in number, and when a time period having elapsed from a point of time, at which the suction pressure has at least the capacity-up pressure value, to a point of time, at which one of the plurality of the compressors stops, is determined, and is shorter than a predetermined duration, at least one of the capacity-up pressure value and the capacity-down pressure value is made larger than said each pressure value.

A refrigerating apparatus comprising:

• a refrigerating cycle having compressors, a condenser, a liquid receiver, expansion valves and evaporators;
• and
• a suction pressure sensor for detecting a pressure on suction sides of the compressors;
• wherein when the suction pressure has at least a capacity-up pressure value, it causes an increase in the number of compressors being operated or the operating frequency;
• and when the suction pressure has at most a capacity-down pressure value, it causes reduction in the number of compressors being operated or the operating frequency;
• when a time period having elapsed from a point of time, at which the suction pressure has at least the capacity-up pressure value, to a point of time, at which the suction pressure has at most the capacity-up pressure value, is determined, and is shorter than a predetermined duration, at least one of the capacity-up pressure value and the capacity-down pressure value is made larger than said each pressure value.