Samsung EHS AE050RXYDEG/EU Manual page 183

10. Maintenance
2 Operate the vacuum pump to vacuum the recovery cylinder, the hoses, the recovery unit and the manifold via opening
the service valves on manifold, recovery unit and recovery cylinder. When a vacuum below 270Pa is reached, close the
manifold valve to the vacuum pump and turn the vacuum pump off.
3 Operate the recovery unit in "liquid mode" and open gradually the circuit liquid service valve first and gas service valve
secondly. Continue recovering refrigerant until the pressure in the circuit is 0bar. Close the valves on the manifold to
the circuit and recovery unit. Set the recovery unit to purge mode and gradually close the line to the manifold (avoid
too high pressures). Close the valves on the cylinder and disconnect the hoses. Weigh both the recovery unit and the
cylinder. All additional weight was taken from the system. Check the recovered amount with the factory charge as
indicated on the name plate. Any shortage must be additionally charged with new refrigerant.
4 Reconnect the vacuum pump and the recovery cylinder. Vacuum the hoses firstly, then the circuit to below 270Pa.
Stand time for vacuum is 30 minutes at least. If satisfied, open the recovery cylinder and recharge the system with it's
content. The remaining refrigerant in the cylinder can be sucked into the circuit by operating the refrigerant charging
procedure. Finally the missing charge can be similarly charged to the system, make sure not to exceed the factory
charge.
Adding refrigerant in running condition
1 Operate the outdoor unit and indoor unit. Or press K1 or K2 on the outdoor unit PCB to run the test mode.
2 After 30 minutes of operation, open the charging ports on low pressure side in heat pump.
3 Vacuum the manifold hose.
4 Open the valve of the low pressure side in the manifold gauge to recharge the remaining refrigerant.
5 After completing, close the valves in manifold gauge and eliminate the hoses from Charging Ports.
Installer reference guide / Mono tank integrated type
Manifold gauge
Low pressure side High pressure side
Scale
High pressure side Low pressure side
Charging port
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