Liebert CR020 - R410 A Precharge for Air-Cooled (A) Units

Chapter 4 Refrigeration Connections 23
Liebert.CRV Series Air Conditioner User Manual
Suction and supply line connection for vacuum creation is shown in Figure 4-4.
Figure 4-4 Suction and supply line connection for vacuum creation
Liquid line connection for vacuum creation is shown in Figure 4-5.
Figure 4-5 Liquid line connection for vacuum creation
Connection after thermostatic valve for vacuum creation and refrigerant charge is shown in Figure 4-6.
Figure 4-6 Connection after thermostatic valve
4.2.1 R410A Precharge For Air-Cooled (A) Units
1. Open all cocks of the system including those used for pressurizing (ambient unit and condensing unit).
By this operation all the components of the refrigerating circuit must be subject to vacuum.
2. Connect a proper, high efficiency vacuum pump (10) suitable for polyester oils to the couplings:
 Compressor intake and delivery using, if available, the three-way Rotalock cocks, coupling 1/4” SAE (make sure
that all three ways are open), otherwise the Schrader valves brazed on the pipings.
 Coupling 1/4” SAE of the liquid receiver (12).
 Coupling 1/4” SAE of the evaporator coil (14).
3. Provide for a connection with refrigerant cylinder before making vacuum.