Test Run and Others
5
TD831077
V-12
3-1. Method of gas leak inspection after completing the tubing
1. Procedure
Connect the indoor unit, tubing, and outdoor unit, and check for gas leakage according to the following procedure (also
check the service valve and the sealing of spindle).
3. Installation Standards
2. Seal inspection
1) Pressurizing & standing time
Pressurize nitrogen gas from the narrow tube and wide tube of the charging port of service valve of each refriger-
ant tubing system.
1 Step 1 Pressurize with 3 kg/cm
2
at first, and then 15 kg/cm
2
: Allow 5 min. or more each time
‘
Check of large leaks possible
2 Step 2 Pressurize with 30 kg/cm
2
: Leave standing for 24 hrs. or more
‘
Check of fine leaks possible
2) Evaluation of leaks
1 In case of no pressure drop
OK
2 In case of pressure drop
✳ Check the leaking spots with soap water.
✳ In case no leaking spot can be detected with soap water
Inspect with gas leak tester, after sealing freon gas.
However, if there is a difference in ambient temperature at the time of pressuring and pressure drop checking, invariably
evaluate by allowing for the compensation.
(The pressure changes by about 0.1 kg/cm
2
per 1 °C).
Refrigerant tubing work
(tube, indoor unit side)
Pressurize nitrogen gas
(3 15 kg/cm G)
Check for pressure
drop
In case of a drop (check & rectify the leaking spot)
OK
Check for pressure
drop
Pressurize nitrogen gas
(30 kg/cm G)
In case of a drop (check & rectify the leaking spot)
2
2
1099_1143
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