Panasonic WH-ADC0309H3E5 Service Manual page 30

5) Please note that the system's pressure may rise
slightly if the test is carried out on mid day, due to
temperature rise. The inverse may happen when
there is temperature drop at night. However, this
variation will be minimal.
6) Waiting time depends on the size of the system.
Larger systems may require 12 hours of waiting
time. Leak detection within smaller system can be
achieved in 4 hours.
7) Check if there is a constant pressure drop. Move
to next step "Step 2: Refrigerant leak detection..."
if there is any pressure drop. Otherwise, release
the Nitrogen gas and, move to "Step 3: Vacuum
test".
8) Next, insert a small amount of same refrigerant
into the system through the centre hose, until the
pressure reaches about 1MPa (10 BarG).
(Low/Gas)
pressure
gauge
7
3
4 8
N R - # # #
2
Step 2: Refrigerant leak detection through Electronic
halogen leak detector and/or ultrasonic leak detector:
1) Use any one of below detector to check leaking.
i) Electronic halogen leak detector.
i-a) Switch on the unit.
i-b) Cover the test area from direct draft.
i-c) Pass the detection probe near test area and
wait for audible and visible signals.
ii) Ultrasonic Leak Detector
ii-a) Make sure the area is quiet.
ii-b) Switch on the ultrasonic leak detector.
ii-c) Move the probe along your air conditioning
system to test for leaks, and mark for repair.
2) Any leak detected at this level shall be repaired
and retested, starting from "Step 1: Pressure test".
NOTE:
- Always recover the refrigerant and Nitrogen gas into
recovery cylinder after completion of a test.
- You must use the detection equipment with
Detectable Leak Rate of 10
- Do not use refrigerant as test medium for system
with total refrigerant charge more than 5kg.
- Test shall be performed with dry Nitrogen or another
non-flammable, non-reactive, dried gas. Oxygen, air
or mixtures containing them shall not be used.
(High/Liquid) pressure gauge
2
2
An example illustrations of setup for
refrigerant leak detection.
-6 3
Pa.m /s or better.
Step 3: Vacuum test:
1) Perform Vacuum test to check leak / moisture if
present.
2) Refer to section "EVACUATION OF THE
EQUIPMENT" to vacuum gas out of the air
conditioning system.
3) Wait for a few hours, depending on the size of the
refrigerating system and monitor the pressure rise.
If the pressure rises until 1 bar absolute, then
there is leak.
If the pressure rises, but it is lower than 1 bar
absolute, then moisture is present.
Next, remove the moisture, or repair, and redo the
refrigerant leak testing, starting from "Step 1: Pressure
test".
(Low/Gas)
pressure
gauge
3
Handle
Vacuum pump
(High/Liquid) pressure gauge
2
2
An example illustrations of setup for
refrigerant leak detection.