Hitachi RAS-8-FSNM - AIR TIGHT TEST

b. Liquid valve
Ref. Pressure
Do not apply a force by spanner
at this portions.
If applied, leakage may occur.
Use two spanners
here to squeeze
the are nut.
O-Ring (Rubber)
Hexagonal Wrench (Size: 4mm)
(To open/close spindle valve)
Stop Ring
Liquid Valve
Cap
Tightening Torque: 37N.m
This cap is attached after work
Check Joint
(Connectable only for
charging hose)
Charge Port Cap
Tightening Torque: 16N.m
Spindle Valve
Counterclockwise ...... Open
Clockwise .................. Close
Closed before shipment
Refrigerant Piping
! CAUTION
• Donotapplyanabnormalbigforcetothespindlevalveattheend
of opening (5.0N.m or smaller). The back seat construction is not
provided.
• Do not loosen the stop ring.  If the stop ring is loosened, it is
dangerous,sincethespindlewillhopout.
• Atthetestrun,fullyopenthespindle.Ifnotfullyopened,thedevices
willbedamaged.
8.3 AIR TIGHT TEST
1 Connect the manifold gauge using charging hoses with a
nitrogen cylinder to the check joints of the liquid line and the
gas line stop valves.
- Perform the air-tight test.
- Do not open the stop valves. Apply nitrogen gas pressure
of 4.15 MPa.
2 Check for any gas leakage at the are nut connections, or
brazed parts by gas leak detector or foaming agent.
? NOTE
aDonotusetheformingagentforairtighttestasfollows.
- Formingagentwhichgenerateammoniagas(NH3)bychemical
reaction.
- Householddetergentwithunknown-composition.
bTherecommendedformingagentsarefollows(Exemple):
Forming Agent Manufacturer
Snoop Nupro (U.S.A.)
Guproex Yokogawa & CO.,Ltd
3 After the air tight test, release nitrogen gas.
Procedure
Completion
of ref. piping
Applying
nitrogen
gas
Repairing
of leakage
part
Pass
Check of
pressure
decrease
! DANGER
Besuretouse nitrogen gasforairtighttest. If othergasessuch
asoxygengas,acetylenegasoruorocarbongasareaccidentally
used,itmaycauseexplosionorgaspoising.
REFRIGERANT PIPING & REFRIGERANT CHARGE
PMML0390B REV.0 - 11/2015 - P5416649
14