Mitsubishi Electric Y Series Manual page 71

Benefits of the WR2-Series
Double heat recovery (WR2-Series)
Mitsubishi Electric now offers double heat recovery operation.
The first heat recovery is within the refrigerant system. Heat is recovered between the indoor units to allow simultaneous
cooling and heating operation.
The second heat recovery is within the water loop, where heat is recovered between the PQRY units.
This double heat recovery operation substantially improves energy efficiency and delivers an ideal solution to the
requirements of modern office buildings, where some areas require cooling even in winter.
• WR2 system diagram
First Heat recovery
between indoor units
• Double heat recovery (WR2)
Cooling tower
Heating Heating Heating Cooling
Heating Heating Heating Cooling
Cooling Cooling Cooling Heating
Cooling Cooling Cooling Heating
BC controller
Heat source unit
Second Heat recovery
Water circuit
Expansion tank
Pump Water piping
Heat taken from water
Second
Heat radiated to water
GL
Heat source unit
Heat
Auxiliary heat
exchanger
source
Pump
Thermal
* The water
storage tank
circuit is closed.
Indoor units
BC controller
First
Indoor units
First Heat recovery
Refrigerant circuit
Heat recovery
between heat source units
Heat recovery
Heating
Cooling
71