Febco 856 Maintenance Manual
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Febco 856 Maintenance Manual

Double check and double check detector assemblies
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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
Double Check and Double Check Detector Assemblies
Read and understand this manual prior to installing,
operating or servicing this equipment.
Maintenance Manual
Series 850, 856, 870V & 876V
2
⁄
" - 10" (65 - 250mm)
1
2

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
Service Procedures for Model 805YB -
Parts Selection Guide Model 850/856 (2
Parts Selection Guide Model 870, 870V / 876, 876V (2
Parts Selection Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
IOM-F -DC/DCDA
Series 850
Series 876V
⁄
" - 10") . . . . . . .6
1
2
⁄
" Bypass . . . . . . . . . . . . . . . . . . .7
3
4
⁄
" - 10") . . . . . . . . . . . . . . . . . . . . . .8
1
2
⁄
" - 10") . . . . . . . . .9
1
2

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Summary of Contents for Febco 856

  • Page 1: Table Of Contents

    General Service Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Service Procedures for Models 850, 856, 870V & 876V (2 ⁄...

  • Page 2: Features And Operating Procedures

    MAINTENANCE MANUAL SERIES 850, 856, 870V & 876V 2 ⁄ "- 10" (65 – 250mm) Feature and Operating Procedures Double Check Valve Assembly Operation How to Order Parts/Repair Kits The FEBCO Double Check Valve Assemblies consist of two indepen- 1) Locate item number and kit number in this maintenance manual .

  • Page 3: Vandalism

    MAINTENANCE MANUAL SERIES 850, 856, 870V & 876V 2 ⁄ "- 10" (65 – 250mm) Troubleshooting Symptom #1 CauSe: Solution: Check fails to hold 1.0 psid minimum A. Debris on sealing surfaces Inspect and clean B. Leaking shutoff valve Inspect and clean, or repair C.

  • Page 4: Freeze Protection Procedures

    MAINTENANCE MANUAL SERIES 850, 856, 870V & 876V 2 ⁄ "- 10" (65 – 250mm) Freeze Protection The Double Check Backflow Prevention Assembly may be subject to damage if the internal water is allowed to freeze . The unit must be pro- tected from freezing using a heated enclosure, insulation using heat tape, or other suitable means .

  • Page 5: General Service Procedures

    6 . Use caution to avoid damaging any guiding surfaces while handling bly, slowly close the inlet shutoff valve, remove the covers and spring parts . Do not force parts together . The O-ring seals used in FEBCO assemblies of both check valves and open the inlet shutoff valve to...
  • Page 6 MAINTENANCE MANUAL SERIES 850, 856, 870V & 876V 2 ⁄ "- 10" (65 – 250mm) Service Procedures for Series 850, 856, 870V & 876V 2 ⁄ "-10"(65-250mm) Check Valve Disassembly and Reassembly 1 . Spring Module Removal a . Slowly close outlet shutoff valve and inlet shutoff valve .
  • Page 7 905276 905277 Items 43, 45, 46, 47 Part # 905277 * Bulkhead fittings are not furnished on late models . Very early productions of Series 856 may require a different bulkhead fitting . Consult your FEBCO representative for assistance .

  • Page 8: Repair Parts

    905276 905277 Items 43, 45, 46, 47 870V 876, Part # 905277 876V * Bulkhead fittings are not furnished on late models . Very early productions may require a different bulkhead fitting . Consult your FEBCO representative for assistance .

  • Page 9: Bypass

    MAINTENANCE MANUAL SERIES 850, 856, 870V & 876V 2 ⁄ "- 10" (65 – 250mm) Service Procedures for Series 805YB — ⁄ " Bypass 1 . Bypass Check Valve Inspection/Repair Series 805YB ⁄ " . c . If the seat disc has been severely cut along the seat ring diameter, the assembly is being subjected to extremely high back pressure a .

  • Page 10: Repair Parts

    MAINTENANCE MANUAL SERIES 850, 856, 870V & 876V 2 ⁄ "- 10" (65 – 250mm) Repair Parts 805YB and Bypass item DeSCription materialS item DeSCription materialS Water Meter Body Bronze Bronze Nipple Brass Nipple Brass O-ring Buna-N Nipple Brass Disc Holder...
  • Page 11 Series 850 Series 860 For nearly half a century, customers have looked to FEBCO for quality products, reliable low head-loss performance, and great value . Today, with the new FEBCO MasterSeries designs, FEBCO has once again taken the initiative with patented product innovations .
  • Page 12 For additional information, visit our web site at: www.FEBCOonline.com Limited Warranty: FEBCO warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge.

This manual is also suitable for:

876v870v850

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