Daikin R32 Split Series Installation Manual page 12

Refrigerant piping work
4.
Evacuating the air with a vacuum pump and checking for gas leakage
WARNING
• Do not mix any substance other than the specified refrigerant (R32) into the refrigeration cycle.
• When refrigerant gas leaks should occur, ventilate the room as soon and as much as possible.
• R32, as well as other refrigerants, should always be recovered and never be released directly into the environment.
• Use a vacuum pump for R32 or R410A exclusively. Using the same vacuum pump for different refrigerants may damage the
vacuum pump or the unit.
• Use tools for R32 or R410A (such as the gauge manifold, charging hose, or vacuum pump adapter).
• During tests never pressurize the appliances with a pressure higher than the maximum allowable pressure (as indicated on the
nameplate of the unit).
• Never directly touch any accidental leaking refrigerant. This could result in severe wounds caused by frostbite.
• When piping work is completed, it is necessary to purge the air and check for gas leakage.
• 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 stop valve rod.
• All refrigerant pipe joints should be tightened with a torque wrench to the specified tightening torque.
1) Connect projection side of charging hose (which comes from gauge manifold) to gas stop 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) Perform vacuum pumping and make sure 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.
(Keep this state for 4-5 minutes to make sure that the compound pressure gauge pointer does not swing back.
If it does go back, this may indicate the presence of moisture or leaking from connecting parts. After inspecting all the
connection and loosening then retightening the nuts, repeat steps 2-4.)
5) Remove covers from liquid stop valve and gas stop valve.
6) Turn the liquid stop 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 stop valve's service port, then fully open liquid and gas stop valves.
(Do not attempt to turn valve rod beyond its stop.)
8) Tighten valve caps and service port caps for the liquid and gas stop valves with a torque wrench at the specified torques.
See "3. Refrigerant piping" on page 8 for details.
9
English