Panasonic WH-ADF0309J3E5CM Service Manual page 170


Before system is charged with refrigerant and before the refrigerating system is put into operation, below site test
procedure and acceptance criteria shall be verified by the certified technicians, and/or the installer.

Be sure to check whole system for gas leakage.
Preparation
(Step 1-2)
Evacuation
(Step 3-4)
Tightness Test
with Inert Gas
(Step 5-7)
Leak detection
Pressure drop?
and repair
Yes
(Step 8)
(Step 9-12)
No
Recovery of
Test Gas
(Step 13)
Evacuation
(Step 3-4)
Open
3-way valves
(Step 14-18)
Complete
Notes:
Recommended use of any of the following leak detector,
I) Universal Sniffer leak detector
II) Electronic halogen leak detector
III) Ultrasonic Leak Detector
1) Connect a charging hose with a push pin to the Low side of a charging set and the service port of the
3-way valve.
2) Attach the gauge manifold set correctly and tightly. Make sure that both valves of the manifold gauge
(low pressure and high pressure) is in close position.
3) Connect the center hose of the manifold gauge to a vacuum pump.
4) Turn on the power switch of the vacuum pump, then turn open the low side manifold gauge valve
and make sure that the needle in the gauge moves from 0 cmHg (0 MPa) to –76 cmHg (–0.1 MPa)
or vacuum until 500 microns is achieved. This process continues for approximately ten minutes.
Then close the low side manifold gauge valve.
5) Remove the vacuum pump from the centre hose and connect the center hose to cylinder of any
applicable inert gas as test gas.
6) Charge test gas into the system and wait until the pressure within the system to reach min. 1.04 MPa
(10.4 barg).
7) Wait and monitor the pressure reading on the gauges. Check if there is any pressure drop. Waiting
time depends on the size of the system.
8) If there is any pressure drop, perform step 9-12. If there is no pressure drop, perform step 13.
9) Use Gas Leak Detector to check for leaks. Must use the detection equipment with a
sensitivity of 5 grams per year of test gas or better.
10) Move the probe along the air conditioning system to check for leaks, and mark for repair.
11) Any leak detected and marked shall be repaired.
12) After repair, repeat evacuation steps 3-4 and tightness test steps 5-7.
Check the pressure drop as in step 8.
13) If no leak,
Recover the test gas. Perform evacuation of steps 3-4.
Then proceed to step 14.
14) Disconnect the charging hose from
the service port of the 3-way valve.
15) Tighten the service port caps of the
3-way valve at a torque of 18 N•m
with a torque wrench.
16) Remove the valve caps of both of
the 2-way valve and 3-way valve.
17) Open both of the valves, using a
hexagonal wrench (4 mm).
It is recommended to allow
refrigerant slowly flow into the
refrigerant system to prevent
refrigerant freezing. Slightly open
2-way valve for 5 seconds then
close the valve. Repeat this action
for 3 cycles then fully open the
valve.
18) Mount back the valve caps onto the
2-way valve and the 3-way valve to
complete this process.
Indoor Unit
Tank
Cyclinder
OPEN
Inert
Vacuum
gas
pump
Vacuum pump adaptor
Air evacuation and tightness test shall be carried out for Tank
unit and Duct unit by connecting manifold gauge seperately to
respective 3-way valve.
170
Outdoor unit
Tube connector
Liquid
side
Tube connector
Gas
side
Liquid side 3-way valve
Close
Gas side 3-way valve
Close
CLOSE