Honeywell North 5400,7600, RU6500 Series Instruction Manual

f. Place the larger of the O-rings (P/N 80861A) onto the speech diaphragm housing and insert the speech diaphragm assembly into the larger port of the lens so thekeys in the port line up with the notches in the housing, and the O-ring is between the inside of the lens and the speech diaphragm housing. When inserted properly the threads of the housing will be completely through the lens and the housing will be flush up against the inside of the lens. g. Insert the outer nut (P/N 80862-H5) onto the housing threads and hand-tighten by turning clockwise. h. Put the remaining inhalation valves (P/N 770017) on the valve seats (P/N 80814A) for the oral/nasal cup (P/N 80815-H5 for medium/large or 80800-H5 for small) making sure they lie flat against the seats. Insert the seat and inhalation valve assembly into the oral/nasal cup. i. Position the oral/nasal cup by first pulling the lower flange on the cup through the small port on the lens so it lies flush with the lens. Straighten the cup by turning it so the peak of the nasal area is on top. Work larger opening of the cup into groove of the speech diaphragm housing that is furthest from the lens. j. Insert the exhalation valve (P/N 770018) into the exhalation valve seat (P/N 80862-H5) and pull in the tab until you hear a “click”. When inserted correctly the flat end of the exhalation valve will be on the thread side of the seat and sit flush with the seat. k. Push the exhalation valve assembly through the lower opening of the oral/nasal cup that is now assembled onto the facepiece. You may need to use a slight pressure to push the assembly completely through. Insert the exhalation housing guard (P/N 80867-H5) onto the housing threads and hand-tighten by turning clockwise.

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