38 MS-SVN056C-EN
Outdoor Unit Installation
5. Leak detection
Check all couplings with leak detector or with soapy water. See next graphic.
A ...... Low pressure valve
B ...... High pressure valve
C, D....Connecting pipe coupling to indoor unit
Note: Isolate entire surface of all exposed parts on flared piping.
Note: Incomplete isolation may cause leaks due to condensation.
6. Vacuum test
• Use a vacuum pump that reaches a level below -0.1MPa and with capacity for discharge above 40L/min.
• Outdoor unit does not require a vacuum test. Therefore both gas and liquid shutoff valves should be
maintained in closed position.
• After 2 hours or more of operation, ensure that the pump reaches a -0.1MPa reading or less. If after 3 hours
of operation the pump did not reach the -0.1MPa reading or less, test to verify the presence of water or gas
leaks in the piping.
Flared nut
Shutoff port
Cap
Valve body
Valve stem
BA
D
C
Point of detection
(indoor unit)
Point of detection
(outdoor unit)
Connect vacuum pump
Operate pump (during 2 hours or more)
Once reaching vacuum level
-0.1MPa, pump should work
additional 20-60 min.
Shut down
vacuum pump
Place state of pump not utilized (1 hour or more)
1. Close vacuum gauge
2. Close connection
between pressure gauge
and vacuum pump
3. Close vacuum pump
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