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5CSL0-06B
Example:
During of pressurizing: 3.8MPa 25˚C
24 hours later: 3.75MPa 20˚C
Although the gauge pressure is dropped from 3.8MPa to
3.75MPa, it can be safely assumed that there is no leakage
because the gauge pressure can also drop due to
the change in outdoor temperature.
(MPa)
3.8
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
3 minutes
5 minutes
Step 3 3.8MPa x 24min
Step 1 1.5MPa x 5min
Step 1 0.3MPa x 3min
Gas Pipe
Outdoor Outdoor Outdoor temperature(℃)
temperature(
temperature(°C)
24 hours
Liquid Pipe
2.6.3 Checking for leakage
[Check 1] (Where pressure falls while carrying out Steps 1
to 3 described on previous page)
▶ Check by measure gage......gas detector.
▶ Check by ear......Listen for the sound of a major leakage.
▶ Check by hand......Check for leak by feeling around jointed
sections with hand.
▶ Bubble check ......Bubbles will reveal the presence of a
leakage.
[Check 2] (When searching for a minor leak or when there
has been a fall in pressure while the system has
been fully pressurized but the source of the leak
cannot be traced.)
1. Release the nitrogen until the pressure reaches 0.3MPa.
2. Increase pressure to 1.5MPa using gaseous
refrigerant(R410).
3. Search for the source of the leakage using a leackage
detector such as a halide torch or a propane or electrronic
detector.
4. If the source of the leakage still cannot be traced then
repressurize with nitrogen up to 3.8MPa and check again.
(The pressure must not be increased to more than
3.8MPa.)
3.75
25°C
20°C
15°C
(Time)
(System sample)
(R410A gas)
Nitrogen gas Gauge Vacuum pump
Do not open the
service valve during
the airtight test.
Air tight test
Important points
1. Where the lengths of piping involved are particularly long
then the air tight test should be carried out block by block.
1) Indoor side
2) Indoor side + vertical pipes
3) Indoor side + vertical pipes + outdoor side
CAUTION
2-way valve
(Open)
3-way valve
(Close)
Liquid side
Hexagonal wrench
Liquid Pipe
Manifold gauge
Gas side
Guideline for each installation process 311
Gas Pipe
Soap water method
1. Remove the caps from the 2-way and 3-way valves.
2. Remove the service-port cap from the 3-way valve.
3. To open the 2-way valve turn the valve stem counterclockwise
approximately 90°, wait for about 2~3 sec,
and close it.
4. Apply a soap water or a liquid neutral detergent on the
indoor unit connection or outdoor unit connections by a
soft brush to check for leakage of the connecting points
of the piping.
5. If bubbles appear then those points have leakage.
Cap