Mark HCNI 533, Technical Manual

Page: 29 / 84

29
EN
5.3.2 Outdoor Unit
Evacuation for the whole system:
(Indoor unit)
(Liquid side)
(Gas side)
2-way valve
Open
3-way valve
Open
(Outdoor unit)
CLOSE
OPEN
Vacuum pump
Hi Lo
Procedure:
1. Confirm that the 2-way and 3-way valves are opened.
2. Connect the vacuum pump to the 3-way valve’s service port.
3. Evacuate the system for approximately 1 hour. Confirm that the compound meter indicates -0.1
MPa (14.5Psi).
4. Close the valve (Low side) on the charge set and turn off the vacuum pump.
5. Wait for 5 minutes then check whether the gauge needle moves after turning off the vacuum
pump. If the gauge needle moves backward, check whether there is gas leakage.
6. Disconnect the charge hose from the vacuum pump.
7. Mount the caps of service port and 2-way and 3-way valves.
8. Use a torque wrench to tighten the caps to a torque of 18 N•m.