Panasonic 26PEK2U6 26PEK2U6 Service Manual - Page 5

3. Different tools required 3-1. Tool specifications have been changed due to the characteristics of R410A. Some tools for R22- and R407C-type refrigerant systems cannot be used. Item Manifold gauge Charge hose Vacuum pump Leak detector Flaring oil New tool? R407C tools compatible with R410A? Remarks Yes No Types of refrigerant, refrigerating machine oil, and pressure gauge are different. Yes No To resist higher pressure, material must be changed. Yes Yes Use a conventional vacuum pump if it is equipped with a check valve. If it has no check valve, purchase and attach a vacuum pump adapter. Yes No Leak detectors for CFC and HCFC that react to chlorine do not function because R410A contains no chlorine. Leak detector for HFC134a can be used for R410A. Yes No For systems that use R22, apply mineral oil (Suniso oil) to the flare nuts on the tubing to prevent refrigerant leakage. For machines that use R407C or R410A, apply synthetic oil (ether oil) to the flare nuts. * Using tools for R22 and R407C and new tools for R410A together can cause defects. Manifold gauge Vacuum pump Outlet Inlet 3-2. Use R410A exclusive cylinder only. When charging with a refrigerant cylinder, use an electronic scale for charging refrigerant. In this case, if the volume of refrigerant in the cylinder becomes less than 20% of the fully-charged amount, the composition of the refrigerant starts to change. Thus, do not use the refrigerant if the amount in the charging cylinder is less than 20%. Also, charge the minimum necessary amount to the charging cylinder before using it to charge the air conditioning unit. Configuration and characteristics of cylinders Valve Valve Liquid Single valve Charge liquid refrigerant with cylinder in up-side-down position. Fig. 1 Liquid Single valve (with siphon tube) Charge with cylinder in normal position. Fig. 2 iv