Haier 2U18MS2VHB Installation Manual

Also see for 2U18MS2VHB: Technical overview Service manual Installation manual Service manual

INSTALLATIONPAGE 8ENGLISHLeak Test3.1 Step - 3.1Refrigerant piping connections for the mini-split system aremade utilizing flare connections. Follow standard practicesfor creating pipe flares. When cutting and reaming the tubing,use caution to prevent dirt or debris from entering the tubing.Remember to place the nut on the pipe before creating theflare.3.2 Step - 3.2To join the lineset piping together, directly align the pipingflare to the fitting on the other pipe, then slide the nut ontothe fitting and tighten. Misalignment may result in a leakingconnection.3.3 Step - 3.3Two wrenches are required to join the flare connections, onestandard wrench, and one torque wrench. See Table 1 for thespecific torque per piping diameter.Step 3.1Half union Flare nutTorque wrenchSpannerForced fastening without careful centering maydamage the threads and cause a leakage of gas.Pipe Diameter(ǿ) Fastening torqueLiquid side6.35mm(1/4") 18N.m/13.3Ft.lbsLiquid/Gas side9.52mm(3/8") 42 N.m/30.1Ft.lbsGas side 12.7mm(1/2") 55N.m/40.6Ft.lbsGas side 15.88mm(5/8") 60 N.m/44.3Ft.lbsTable 1Step 3.2Step 3.3Hazard of Explosion! Never use an open flame to detectgas leaks. Explosive conditions may occur. Use a leak testsolution or other approved methods for leak testing. Failureto follow recommended safe leak test procedures couldresult In death or serious injury or equipment or propertydamage.Use only dry nitrogen with a pressure regulator forpressurizing unit. Do not use acetylene, oxygen orcompressed air or mixtures containing them for pressuretesting. Do not use mixtures of a hydrogen containingrefrigerant and air above atmospheric pressure for pressuretesting as they may become flammable and could result inan explosion. Refrigerant, when used as a trace gas shouldonly be mixed with dry nitrogen for pressurizing units. Failureto follow these recommendations could result in death orserious injury or equipment or property damage.Step 4.1Piping ConnectionStep 3 - Refrigerant Line ConnectionsStep 4 - Leak Test and Evacuation4.1 Step - 4.1Using a tank of nitrogen with attached regulator, chargethe system with 150 PSIG of dry nitrogen. Use adapter AD-87 (field supplied) to connect to the valve. Check for leaksat the flare fittings using soap bubbles or other detectionmethods. If a leak is detected, repair and recheck. If no leaksare detected, proceed to evacuate the system.