IOM-F-DC/DCDA
I N S T A L L A T I O N , O P E R A T I O N , M A I N T E N A N C E
Maintenance Manual
Double Check and Double Check Detector Assemblies
Series 850, 856, 870V & 876V
2
1
⁄
2
" - 10" (65 – 250mm)
Read and understand this manual prior to installing,
operating or servicing this equipment.
Table of Contents
Features and Operating Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
How to Order Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Trouble Shooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Vandalism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Freeze Protection Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
General Service Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Service Procedures for Models 850, 856, 870V & 876V (2
1
⁄
2
" - 10") . . . . . . .6
Service Procedures for Model 805YB —
3
⁄
4
" Bypass . . . . . . . . . . . . . . . . . . .7
Parts Selection Guide Model 850/856 (2
1
⁄
2
" - 10") . . . . . . . . . . . . . . . . . . . . . .8
Parts Selection Guide Model 870, 870V / 876, 876V (2
1
⁄
2
" - 10") . . . . . . . . .9
Parts Selection Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
Series 850
Series 876V
