EVACUATION
When moving the unit to new location,
perform evacuation using vacuum pump.
Make sure the refrigerant added into the air
conditioner is liquid form.
Caution in handling the packed valve
Open the valve stem until it hits against the
stopper. Do not try to open it further.
Securely tighten the valve stem cap with a
wrench.
Valve stem cap tightening torque (See
Tightening torque table in previous page ).
When Using the Vacuum Pump
(For method of using a manifold valve, refer
to its operation manual.)
1. Completely tighten the flare nuts, A, B, C, D,
connect the manifold valve charge hose to a
charge port of the low-pressure valve on the
gas pipe side.
2. Connect the charge hose connection to the
vacuum pump.
3. Fully open the LOW valve of the manifold valve.
4. Operate the vacuum pump to evacuate. Check
guage for proper vacuum.
After the evacuation is complete, fully close
the LOW valve of the manifold valve and stop
the operation of the vacuum pump.
5. Run evacuation for 30 minutes or more and check
that the vacuum meter indicates
-76cmHg (-1x10
5
Pa).
6. Turn the stem of the packed valve B about
45
degrees counter clockwise for 6~7 seconds
to purge the line of air, then tighten the flare nut
again. Make sure the pressure display in the
pressure indicator is a little higher than the
atmosphere pressure.
7. Remove the charge hose from the LOW
pressure charge port.
8. Fully open the packed valve stems B and A.
9. Securely tighten the cap of the packed valve.
Refrigerant
Outdoor
Indoor
unit
unit
A
Gas side
C
Liquid side
D
B
Packed valve
Half union
Fig.59
Flare nut
Stopper
Cap
Valve body
Valve stem
Fig.60
Manifold valve
Compound meter Pressure gauge
-76cmHg
Handle Lo
Handle Hi
Charge hose
Charge hose
Vacuum pump
Low pressure valve
Fig.61
24