Purging Air And Checking Gas Leakage - Daikin 2MXS52E2V1B Installation Manual

Refrigerant Piping Work
4.

Purging air and checking gas leakage

1) 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 (R410A) into the refrigeration cycle.
2) When refrigerant gas leaks occur, ventilate the room as soon and as much as possible.
3) R410A, as well as other refrigerants, should always be recovered and never be released directly into the environment.
4) Use a vacuum pump for R410A 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 (4mm) to operate the shut-off valve rod.
• All refrigerant pipe joints should be tightened with a torque wrench at the specified tightening torque.
1) Connect projection side (on which worm pin is pressed) of charging hose (which comes from gauge manifold) to gas shut-off
valve's service port.
2) Fully open gauge manifold's low-pressure valve (Lo) and completely close its high-pressure valve (Hi).
(High-pressure valve subsequently requires no operation.)
3) Apply vacuum pumping. Check that the compound pressure gauge reads –0.1MPa (–76cmHg).
Evacuation for at least 1 hour is recommended.
4) Close gauge manifold's low-pressure valve (Lo) and stop vacuum pump.
(Leave as is for 4-5 minutes and make sure the coupling meter needle does not go back.
If it does go back, this may indicate the presence of moisture or leaking from connecting parts. After inspecting all the connec-
tion and loosening then retightening the nuts, repeat steps 2-4.)
5) Remove covers from liquid shut-off valve and gas shut-off valve.
6) Turn the liquid shut-off valve's rod 90 degrees counterclockwise with a hexagonal wrench to open valve.
Close it after 5 seconds, and check for gas leakage.
Using soapy water, check for gas leakage from indoor unit's flare and outdoor unit's flare and valve rods.
After the check is complete, wipe all soapy water off.
7) Disconnect charging hose from gas shut-off valve's service port, then fully open liquid and gas shut-off valves.
(Do not attempt to turn valve rod beyond its stop.)
8) Tighten valve lids and service port caps for the liquid and gas shut-off valves with a torque wrench at the specified torques.
See "3 Refrigerant piping" on page 6 for details.
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