20
21
2. Air purging by the refrigerant
1. Confi rm that both the 2-way and 3-way valves are set to the
“closed” position.
2. Connect the charge set and a charging cylinder to the service
port of the 3-way valve. Leave the valve on the charging
cylinder closed.
3. Air purging. Open the valves on the charging cylinder and the
charge set. Purge the air by loosening the fl are nut on the
2-way valve approximately 45° for 3 seconds then closing it
for 1 minute; repeat 3 times. After purging the air, use a torque
wrench to tighten the fl are nut on the 2-way valve.
4. Check for gas leakage. Check the fl are connections for gas
leakage.
5. Discharge the refrigerant. Close the valve on the charging
cylinder and discharge the refrigerant by loosening the fl are nut
on the 2-way valve approximately 45° until the gauge indicates
0.3 to 0.5 Mpa.
6. Disconnect the charge set and the charging cylinder, and set
the 2-way and 3-way valves to the “open” position. Be sure to
use a hexagonal wrench to operate the valve stems.
7. Mount the valve stems nuts and the service port cap.
Be sure to use a torque wrench to tighten the service port cap
to a torque 18Nm.
Be sure to check for gas leakage.
1. Confi rm that both the 2-way and 3-way valves are set to the
“open” position.
2. Connect the vacuum pump to 3-way valve’s service port.
3. Evacuate for approximately one hour. Confi rm that the
compound meter indicates -0.1Mpa.
4. Close the valve (Low side) on the charge set, turn off the
vacuum pump, and confi rm that the gauge needle does not
move (approximately 5 minutes after turning off the vacuum
pump).
5. Disconnect the charge hose from the vacuum pump.
Procedure:
Procedure:
6.7 Re-installation while the outdoor unit need to be repaired
1. Evacuation of the whole system
E963_Lennox Luna Inverter Service Manual 1c.indd 20-21
E963_Lennox Luna Inverter Service Manual 1c.indd 20-21
13/12/11 4:43 PM
13/12/11 4:43 PM
