User Guide

Page 2 FEBCO Model 850 / 850U (
1
/
2
" - 2")
TABLE OF CONTENTS
Features and Operating Procedures ................................................................................................................2
Vandalism .........................................................................................................................................................2
General Service Procedures ............................................................................................................................3
Cut-A-Way Drawing ..........................................................................................................................................3
Trouble Shooting Procedures ...........................................................................................................................4
Check Module Disassembly .............................................................................................................................4
Check Module Seal Replacement ....................................................................................................................5
Check Module Re-Assembly ............................................................................................................................ 5
Exploded View ..................................................................................................................................................6
Parts List ..........................................................................................................................................................7
Repair Kits........................................................................................................................................................8
Testing ..............................................................................................................................................................9
Freeze Protection ............................................................................................................................................. 9
Other FEBCO MasterSeries
®
Products ..........................................................................................................10
Notes Page..................................................................................................................................................... 11
Warranty .......................................................................................................................................... Back Cover
FEATURES AND OPERATING PROCEDURES
The FEBCO Double Check Assembly Backflow Preventer consists of two independently operating, spring
loaded check valves. The pressure drop across the first check valve is approximately 1.0 PSIG with no flow.
The pressure drop across the second check valve is also 1.0 PSIG with no flow. A complete assembly
includes two shut-off valves and four test cocks.
VANDALISM
If the unit is installed where vandalism may be a problem, the assembly should be protected and secured.
On
1
/
2
" through 2" units the handles of shut-off valves can be removed to discourage tampering.
A protective enclosure can be installed over the unit to discourage vandals. If an enclosure is used, it should
be installed so that adequate clearance is available for maintenance and testing. Consult local codes before
installing any type of protective enclosure.