York EVEREST R22 Installation Manual page 13

When relocate the unit to another place, perform evacuation using vacuum pump.
Make sure the refrigerant added into the air conditioner is liquid form in any case.
(Not applicable to the units with R22 refrigerant)
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 spanner or the like.
Valve stem cap tightening torque (See Tightening torque table in previous page ).
Refrigerant
Outdoor
unit
A
B
Packed valve
Fig.22
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,
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 handle Lo of the manifold valve.
4. Operate the vacuum pump to evacuate. After
flare nut of the Lo valve on the gas pipe side
(Operation noise
0 instead of minus)
5. After the evacuation is complete, fully close
handle Lo of the
operation of the vacuum pump.
Make evacuation for 15 minutes or more
check that the
-76cmHg (-1x10 Pa).
6. Turn the stem of the packed valve B about 45
counterclockwise for 6~7 seconds after the gas
coming out, 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 hose.
8. Fully open the packed valve stems B and A.
9. Securely tighten the cap of the packed valve.
12
Air purging
Indoor
unit
Gas side
C
Liquid side
D
Half union
of the vacuum
manifold valve and stop the
compound meter indicates
5
Valve body
connect the manifold
starting evacuation,
and check that the air is entering
pump changes and a com
the
and
Charge hose
o
Flare nut
Stopper
Cap
Valve stem
Fig.23
valve charge
slightly loose the
pound meter indicates
Manifold valve
Compound meter Pressure gauge
-76cmHg
Handle Lo
Charge hose
Low pressure valve
Fig.24
Handle Hi
Vacuum pump