|| Absorption refrigerating machines which use a combination of water and lithium bromide, have been ppopularized dramatically. Since its development, absorption refrigerating machines have been used widely with technological innovation in energy savings, maniaturization, reduction in weight and improvements in reliability. Currently, they have been broadened to cover not only large scale buildings and a district cooling and heating system but also medium and small scale buildings too. This experiment will approach based technological operation and research developments of absorption water chiller-heater. Moveover, developing new high COP models applied above results.