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 flare 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
!
C A U T I O N
• 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 flare nut connections, or
brazed parts by gas leak detector or foaming agent.
?
N O T E
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.)
Guproflex
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
!
D A N G E R
Be sure to use nitrogen gas for air tight test. If other gases such
as oxygen gas, acetylene gas or fluorocarbon gas are accidentally
used, it may cause explosion or gas poising.
REFRIGERANT PIPING & REFRIGERANT CHARGE
PMML0390B REV.0 - 11/2015 - P5416649
14