Haier AD35S2SM3FA - Page 190

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3.Refrigerant Piping Work
1). Align the centres of both ares and tighten the are nuts 3 or 4 turns by hand. Then tighten them fully with the
torque wrenches.
Use torque wrenches when tightening the are nuts to prevent damage to the are nuts and escaping gas.
2)To prevent gas leakage, apply refrigeration oil on both inner and outer surfaces of the are. (Use refrigeration oil
for R32)
1) Do not mix any substance other than the specied refrigerant (R32) into the refrigeration cycle.
2) When refrigerant gas leaks occur, ventilate the room as soon and as much as possible.
3) R32, as well as other 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 refrigerents may damage
the vacuun pump or the unit.
Connect projection side of charging hose (Which comes from gauge manifold) to gas stop valve's service port.
Remove covers from liquid stop valve and gas stop valve.
Fully open gauge manifold's low-pressure valve(Lo) and completely close its high-pressure valve(Hi). (High-
pressure valve subsequently requires no operation.)
Apply vacuum pumping. Check that the compound pressure gauge reads-0.1MPa(-76cmHg). Evacuation for
at lease 1 hour is recommended.
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 needie 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 connection and loosening then retightening thenuts, reqeat steps 2-4. )
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 are and outdoor unit's are and valve rods. After the
check is complete, wipe all soapy water off.
• 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 at the specied tightening torque.
4. Purging Air And Checking Gas Leakage
When piping work is completed, it is necessary to purge the air and check for gas leakage.
Flare Nut Tightening Torque
Flare nut for ø 6.35 14.2-17.2N.m(144-175kgf.cm)
Flare nut for ø 9.52 32.7-39.9N.m(333-407kgf.cm)
Flare nut for ø 12.7 49.5-60.3N.m(505-615kgf.cm.)
Flare nut for ø 15.88 61.8-75.4N.m(630-769kgf.cm.)
Valve Cap Tightening Torque
Liquid pipe 26.5-32.3N.m(270-330kgf.cm)
Gas pipe 48.1-59.7N.m(490-610kgf.cm)
Service Port Cap Tightening Torque
10.8-14.7N.m(110-150kgf.cm)
WARNING