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STEP 2 - Remove the pressure tap cap and <br /> valve cores from both service valves. <br /> STEP 3 - Purge the refrigerant lines and indoor <br /> coil with dry nitrogen. <br /> 0 <br /> STEP 4 -Wrap a wet rag around the valve body <br /> to avoid heat damage and continue the dry nitro- <br /> gen purge. <br /> Braze the refrigerant lines to the service valves. <br /> For units shipped with a field-installed external <br /> drier, check liquid line filter drier's directional flow <br /> arrow to confirm correct direction of refrigeration <br /> flow (away from outdoor unit and toward evapo- <br /> rator coil) as illustrated. Braze the filter drier to <br /> the Liquid Line. <br /> 3-4"from valve <br /> Continue the dry nitrogen purge. Do not remove e 111` <br /> the wet rag until all brazing is completed. e <br /> e e , <br /> Important: Remove the wet rag before stopping <br /> the dry nitrogen purge. <br /> Note: Install drier in Liquid Line. <br /> NOTE: Precautions should be taken to avoid <br /> heat damage to basepan during brazing. It is <br /> recommended to keep the flame directly off of <br /> the basepan. <br /> 18-BC108D1-1 B-EN 9 <br />