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6.5 Adding the refrigerant after running the system for many years
Electronic scale
6.6 Re-installation while the indoor unit need to be repaired
1. Collecting the refrigerant into the outdoor unit
1. Connect the charge hose to the 3-way service port, open the
2-way valve and the 3-way valve. Connect the charge hose
to the valve at the bottom of the cylinder. If the refrigerant is
R410A, make the cylinder bottom-up to ensure liquid charge.
2. Purge the air from the charge hose. Open the valve at the
bottom of the cylinder and press the check valve on the charge
set to purge the air (be careful of the liquid refrigerant).
3. Put the charging cylinder onto the electronic scale and record
the weight.
4. Operate the air conditioner in the cooling mode.
5. Open the valves (Low side) on the charge set and charge the
system with liquid refrigerant.
6. When the electronic scale displays the proper weight (refer to
the gauge and the pressure of the low side), disconnect the
charge hose from the 3-way valve’s service port immediately
and turn off the air conditioner before disconnecting the hose.
7. Mount the valve stem caps and the service port. Use a torque
wrench to tighten the service port cap to a torque of 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
Remove the valve stem caps and confi rm that the valve stems
are in the “open” position.
Be sure to use a hexagonal wrench to undo the valve stems.
2. Connect the charge hose with the push pin of handle Lo to the
3-way valve’s gas service port.
3. Air purging of the charge hose. Open the handle Lo valve of the
manifold valve slightly to purge air from the charge hose for 5
seconds and then close it quickly.
4. Set the 2-way valve to the “closed” position.
5. Operate the air conditioner on the cooling cycle and stop it
when the gauge indicates 0.1MPa.
6. Set the 3-way valve to the “closed” position immediately.
Do this quickly so that the gauge ends up indicating 0.3 to
0.5Mpa. Disconnect the charge set, and tighten the 2-way and
3-way valve’s stem nuts. Use a torque wrench to tighten the
3-way valves service port cap to a torque of 1.8 kgf.m. Be sure
to check for gas leakage.
Procedure:
Procedure:
E963_Lennox Luna Inverter Service Manual 1c.indd 18-19
E963_Lennox Luna Inverter Service Manual 1c.indd 18-19
13/12/11 4:43 PM
13/12/11 4:43 PM
