Refrigerating cycle apparatus

A refrigerating cycle apparatus having a compressor, a condenser, a first pressure-reducing device, an evaporator, said refrigerating cycle device comprising:

• a hot gas bypass conduit for directly connecting a discharge side of the compressor to the inlet side of the evaporator;
• a second pressure-reducing device provided in the hot gas bypass conduit for reducing in pressure gas refrigerant delivered by the compressor;
• a valve means for switching a connection between the discharge side of said compressor and the hot gas bypass conduit, said valve means switching a connection between the discharge side of the compressor and the condenser, wherein said evaporator generates heat and acts as a radiator from gas refrigerant provided by the discharge side of the compressor and directly through the hot gas bypass conduit when in a hot gas bypass heating mode;
• first control means controlling the valve means such that refrigerant flows to a condenser side during hot gas bypass heating mode when physical quantity representing a high-side pressure at the compressor discharge side rises:
• above a set value;
• and
• second control means for restoring the valve means to a heating mode operation state when a physical quantity representing a heating capacity of the evaporator falls below a set value, said set value indicating that there is no heating capacity.

A refrigerating cycle apparatus having a compressor, a condenser, a first pressure-reducing device, an evaporator, said refrigerating cycle apparatus comprising:

• a hot gas bypass conduit directly connecting the discharge side of the compressor to the inlet side of the evaporator;
• a second pressure-reducing device provided in the hot gas bypass conduit for reducing in pressure gas refrigerant delivered by the compressor, wherein said evaporator is heated and acts as a radiator when in a hot gas bypass heating mode, said radiator being heated by gas refrigerant from a discharge side of said compressor directly through said hot gas bypass conduit;
• stop control means stopping the compressor when a physical quantity representing a high-side pressure at a compressor discharge side rises above a set value during the hot gas bypass heating mode;
• and
• operation restart control means which restarts the compressor when a time which the compressor has been stopped reaches a set value.