Working Steps - Hitachi RAF-35NH5 Service Manual

. Servicing work (Rerfigerant recharging)
Ð0.1MPa
Handle Lo
Charge hose
Vacuum pump
adapter
Vacuum pump
Charge hose
Service valve (2-Way)
Ball valve
Service port
AUTION
1. Be sure to use the vacuum pump, vacuum pump
adapter and gauge manifold to refer to their instruction
manuals beforehand.
2. Ascertain that the vacuum pump is filled with oil to the
level designated on the oil gauge.
3. After closed the ball valve of charge hose, it should be
disconnected at service port side and refrigerant cylinder
side at first.
Next, after discharging the remained gas in the charge
hose by opening the ball valve a little, disconnect it at
gauge manifold side. You can prevent from being
released the refrigerant suddenly by connecting the ball
valve to service port. And you can work with more
safety.
Compound Pressure
pressure gauge
gauge
Charge hose
Ball valve
Service valve
(3-Way)
Gauge manifold
Handle Hi
Refrigerant
cylinder
Scale
- 28 -

Working steps

1. Connect the charge hose
2. Connect the vacuum pump adapter to the
vacuum pump. Connect the 1/2" conversion
adapter to the vacuum pump adapter.
Connect the charge hose
adapter.
3. Connect the charge hose
cylinder.
. Open the handle Lo .
Turn ON the power switch of the vacuum
pump & adapter.
Run the vacuum pump in specified time.
5. When the compound pressure gauge's
pointer has indicated -0.1MPa, place the
handle Lo in the fully closed position.
Turn OFF the power switch of the vacuum
pump & adapter.
6. Remove the charge hose
at portion .
7. Air purge of gauge manifold.
Open the refrigerant cylinder's valve and
push the valve core at portion
manifold. Then the refrigerant is discharge in
a moment.
8. Calculation of charged refrigerant amount.
9. Charging of refrigeration.
Open the handle Lo
the designated amount.
10. Completion of charging.
11. Be closed the valve of charge hose
12. Run the compressor at cooling operation.
13. Remove the charge hose
Remove the charge hose
Remove the charge hose
1 . Attach the caps.
15. Gas leakage check.
to outdoor unit.
to the conversion
Then, service valve
& is closed.
to the refrigerant
of vacuum pump
of gauge
in a turn and charge
.
& .
rom portion .
from portion .