Patent ID: 11940188
Assignee: COPELAND LP
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 14:
15. The heat-pump system of claim 14, wherein:
the heat-pump system is operable in a first heating mode, a cooling mode, a defrost mode, and a second heating mode,
in the first heating mode: (a) the first and second reversing valves are in their first positions, (b) the first and second bypass valves are in their first positions, (c) the pump is shutdown, and (d) the compressor is operating,
in the cooling mode: (a) the first and second reversing valves are in their second positions, (b) the first and second bypass valves are in their first positions, (c) the pump is shut down, and (d) the compressor is operating,
in the defrost mode: (a) the first and second reversing valves are in their first positions, (b) the first and second bypass valves are in their second positions, (c) the pump is operating, and (d) the compressor is shut down, and
in the second heating mode: (a) the first reversing valve is in its second position, (b) the second reversing valve is in its first position, (c) the second bypass valve is in its second position, (c) the pump is operating, and (d) the compressor is shut down.