Hitachi RAS-4-HNPE - Outdoor Unit Stop Valve

3. Piping work and refrigerant charge
60
SMGB0079 rev.0 - 01/2013
3.2.3 Outdoor unit stop valve
1 Remove the stop valve cap before performing the air tight test after connecting the are nut. Tighten the spindle valve
in clockwise according to the following table “Tightening Torque of Stop Valves.”
2 Tighten the are nut according the specied torque. If the tightening torque is excessive, it may cause refrigerant leaka-
ge from the spindle part.
3 Perform the air tight test after the tightening work. It is more effective to perform this work after x the are nuts for the
piping connection to the stop valves.
4 Use the charging hose for the check joint connection. When removing the charging hose from the check joint, a sound
may be heard by a small quantity of refrigerant leak.However it is not abnormality. Do not apply excessive force to the
end of opening the spindle.(Tightening Torque: < 5.0N-m)
Spindle Type Ball Type
(a)

Spindle valve

Flare nut

Cap

Check joint for service port
Outdoor unit
Tightening Torque (Nm)
   
Gas valve Liquid valve Gas valve Liquid valve Gas valve Liquid valve Gas valve Liquid valve
RAS-(2-2.5)HVNP 7-9 7-9 33-42 33-42 33-42 33-42 14-18 14-18
RAS-3HVNC
RAS-3HVNPE
9-11 7-9 68-82 33-42 33-42 33-42 14-18 14-18
RAS-(4-6)H(V)NCE 9-11 7-9 68-82 33-42 33-42 33-42 14-18 14-18
RAS-(4-6)H(V)NPE - 7-9 68-82 33-42 20-25 33-42 14-18 14-18
RAS-8HN(P/C)E - 7-9 100-120 33-42 20-25 33-42 14-18 14-18
RAS-10HN(P/C)E - 7-9 100-120 50-62 20-25 33-42 14-18 14-18
RAS-12HN(P/C) - 7-9 100-120 50-62 12-14 33-42 12-14 14-18
Spindle Type
Nº Description Remarks

Cap

Allen wrench Hex 4 mm *

Refrigerant Piping Field Supplied

Flare nut

Refrigerant Pressure To Outdoor Unit

Seat Surface Fully closed position

Check Joint Only the charging those can be connected

Charge port cap

O-Ring Rubber

Spindle valve
Open – Counterclockwise
Close – Clockwise
«
Shaft
¬
Pin

Stopper
(a) Closed
This valve is opened or closed with rotating 90
degrees at the ball valve part. Rotate the shaft
until the pin touches the stopper. Do not apply the
extra force. Use a slotted screwdriver to control
the shaft. Do not leave the ball valve partly open
(b) Opened
Ball Type
(a) (b)