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• When piping work is completed, it is necessary to purge the air and check for gas leakage
WARNING
1) Do not mix any substance other than the specified refrigerant (R32) into the refrigeration cycle.
2) When refrigerant gas leaks occur, ventilate the room as soon and as much as possible.
3) Refrigerants should always be recovered and never be released directly into the environment.
4) Use a vacuum pump for R32 exclusively. Using the same vacuum pump for different refrigerants may damage the vacuum pump or the unit.
• If using additional refrigerant, perform air purging from the refrigerant
pipes and indoor unit using a vacuum pump, then charge additional
refrigerant.
• Use a hexagonal wrench 5/32" (4mm) to operate the stop valve rod.
• All refrigerant pipe joints should be tightened with a torque wrench at
the specified tightening torque.
1) Pressurize the liquid pipe and gas pipe from the service ports to 604psi (4.17MPa) (do not pressurize more than
604psi(4.17MPa)) for 1 hour minimum, 24 hours recommended. The test pressure after removal of pressure source
shall be maintained for at least 1 hour with no decrease of pressure indicated by the test gauge, with test gauge
resolution not exceeding 5% of the test pressure.
If there is a pressure drop, check for leaks, make repairs and perform the pressure test again.
2) Connect the gauge manifold's charging hose to the gas stop valve's service port.
3) Fully open the low-pressure valve (Lo) on the gauge manifold and fully close the high-pressure valve (Hi).
(High-pressure valve will require no further operation.)
4) Evacuate system using vacuum pump to below 500 microns for 1 hour minimum or as required for compliance with
national and local codes and standards, which may vary between residential, commercial, and industrial building.
5) Close the low-pressure valve (Lo) on the gauge manifold, stop vacuum pumping and remove the vacuum pump.
(Maintain this condition to make sure the pressure does not rise above 1500 microns within 10 minutes.)
6) Remove the valve caps from the liquid stop valve and gas stop valve.
7) To open the liquid stop valve, turn the rod of the valve 90° counter clockwise using a hexagonal wrench.
Close it after 5 seconds and check for gas leakage.
Using soapy water, check for gas leakage from the indoor unit's flare and outdoor unit's flare and valve rods.
After the check is complete, wipe all soapy water off.
8) Disconnect the charging hoses from the service port for the gas stop valve, then fully open the liquid and gas stop
valves.
(Do not attempt to turn the valve rods further than they can go.)
9) Tighten the valve caps and service port caps for the liquid and gas stop valves with a torque wrench to the specified
torques.
Refer to "4. Refrigerant piping" on page 1-11 for details.
All field made refrigerant joints of indoor shall be tested with refrigerant detector with sensitivity of 0.18oz (5 g) per
year of refrigerant or better under a pressure of at least 153 psi (1.05MPa) and no leak shall be detected.
*1
If the compound pressure gauge pointer swings back, the refrigerant may have water content or there may be a
loose pipe joint.
Check all pipe joints and retighten nuts as needed, then repeat step 3) through 5).
PURGING AIR AND CHECKING GAS LEAKAGE
Compound
pressure gauge
Low-pressure
valve
Charging
hoses
1-14
Pressure meter
Gauge
Liquid
manifold
Valve
stop
High
caps
valve
pressure
valve
Vacuum pump Service port
*1
Gas stop
valve
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