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IOM-F-DC/DCDA <br />Maintenance Manual <br />Double Check and Double Check Detector Assemblies <br />Series 850, 8561 870V &= <br />21/2" - 10" (65 — 250m m ) <br />Series 850 <br />Table of Contents <br />Features and Operating Procedures................................2 <br />How to Order Parts.............................................2 <br />Trouble Shooting Guide..........................................3 <br />Vandalism.....................................................3 <br />Testing.......................................................3 <br />Freeze Protection Procedures.....................................4 <br />General Service Procedures......................................4 <br />Service Procedures for Models 850, 856, 870V & 876V (21/" -10") .......6 <br />Service Procedures for Model 805YB — 3/4" Bypass ...................7 <br />Parts Selection Guide Model 850/856 (2'/z"-10")......................8 <br />Parts Selection Guide Model 870, 870V / 876, 876V (2'/z" - 10") .........9 <br />Parts Selection Guide ....................................... <br />10-11 <br />Read and understand this manual prior to installing, <br />operating or servicing this equipment. <br />FEBCO� <br />