Absorption Chiller Maintenance -
One manufacturer's absorption chillers has a
single motor/multiple pump configuration for refrigerant and solution flow
and a purge unit. Other manufacturers use individual hermetic solution and
refrigerant pumps cooled and lubricated by the pumped solution. Another uses
open motors with a shaft seal.
Pictured here are two hermetic, refrigerant cooled and lubricated pump
assemblies. The hermetically sealed motor drives the solution and
refrigerant pump impellers. In this multiple pump arrangement, motor coolant
and lubrication is by the fluid being pumped. Hermetic pump designs
eliminate the need for external shaft seals – a maintenance item and
potential source of air leakage.