Panasonic UQ09 E8 Series, Руководство по установке

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5
ENGLISH
4. Close the Low side valve of the charging set and turn off the
vacuum pump. Make sure that the needle in the gauge does not
move after approximately fi ve minutes.
Note : BE SURE TO FOLLOW THIS PROCEDURE IN ORDER
TO AVOID REFRIGERANT GAS LEAKAGE.
5. Disconnect the charging hose from the vacuum pump and from the
service port of the 3-way valve.
6. Tighten the service port caps of the 3-way valve at a torque of
18 N•m with a torque wrench.
7. Remove the valve caps of both of the 2-way valve and 3-way
valve. Position both of the valves to “OPEN” using a hexagonal
wrench (4 mm).
8. Mount valve caps onto the 2-way valve and the 3-way valve.
•
Be sure to check for gas leakage.
CAUTION
If gauge needle does not move from 0 cmHg (0 MPa) to –76 cmHg
(–0.1 MPa), in step
3
above take the following measure:
•
If the leak stops when the piping connections are tightened
further, continue working from step
3
.
•
If the leak does not stop when the connections are
retightened, repair location of leak.
•
Do not release refrigerant during piping work for installation
and reinstallation. Take care of the liquid refrigerant, it may
cause frostbite.
AIR-TIGHTNESS TEST ON THE REFRIGERATING SYSTEM
Before system charged with refrigerant and before the refrigerating
system in put into operation, below site test procedure and
acceptance criteria shall be verifi ed by the certifi ed technicians, and/
or the installer:-
Step 1: Pressure test for refrigerant leak detection:
1) Steps for pressure test, in accordance to ISO 5149.
2) Evacuate the system from refrigerant before the leak test, attach
the gauge manifold set correctly and tightly. Charging hose
of Low side connect to Gas side. (Charging hose of High side
connect to Liquid side if applicable.)
3) Adjust the knob on the service valves, and regulator on the
gauge set, so that test gas can be inserted through the centre
manifold of the gauge set.
4) Insert Nitrogen gas into the system through the centre manifold
and wait until the pressure within the system to reach about
1MPa (10 BarG) wait for a few hours and monitor the pressure
reading on the gauges.
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).
7
2
4 8
2
3
N
2
R - # # #
(Low/Gas)
pressure gauge
(High/Liquid) pressure gauge
An example illustrations of setup for
refrigerant leak detection.
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
-6 Pa.m 3 /s or better.
-
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-
fl ammable, non-reactive, dried gas. Oxygen, air or mixtures
containing them shall not be used.
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”.
2
2
3
Vacuum pump
Handle
(Low/Gas)
pressure gauge
(High/Liquid) pressure gauge
An example illustrations of setup for
refrigerant leak detection.