Haier 1U71S2SG1FA Service Manual

Also see for 1U71S2SG1FA: Installation manual Service manual Installation manual

Contents

1873.Refrigerant Piping Work1). Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with thetorque wrenches.Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and escaping gas.2)To prevent gas leakage, apply refrigeration oil on both inner and outer surfaces of the flare. (Use refrigeration oilfor R32)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) R32, as well as other refrigerants, should always be recovered and never be released directly into theenvironment.4) Use a vacuum pump for R32 exclusively. Using the same vacuum pump for different refrigerents may damagethe 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 forat 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 inspectingall 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 itafter 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 thecheck is complete, wipe all soapy water off.• If using additional refrigerant, perform air purging from the refrigerant pipes and indoor unit using a vacuumpump, 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 specified tightening torque.4. Purging Air And Checking Gas LeakageWhen piping work is completed, it is necessary to purge the air and check for gas leakage.Flare Nut Tightening TorqueFlare 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 TorqueLiquid pipe 26.5-32.3N.m(270-330kgf.cm)Gas pipe 48.1-59.7N.m(490-610kgf.cm)Service Port Cap Tightening Torque10.8-14.7N.m(110-150kgf.cm)WARNING