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STEP 5 - Replace the pressure tap valve cores <br /> after the service valves have cooled. <br /> Section 8. Refrigerant Line Leak Check <br /> 8.1 Check For Leaks <br /> STEP 1 - Pressurize the refrigerant lines and <br /> evaporator coil to 150 PSIG using dry nitrogen. 150 PS I G <br /> STEP 2 - Check for leaks by using a soapy <br /> solution or bubbles at each brazed location. <br /> Remove nitrogren pressure and repair any leaks <br /> before continuing. <br /> 0 <br /> 10 18-BC108D1-1 B-EN <br />