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Feature and Operating Procedures
MAINTENANCE MANUAL: MODELS 860, LF860, 860U & LF860U
1
/2"- 2" (15 – 50mm)
The FEBCO Series 860 Reduced Pressure Zone Backflow Preventer
Assembly consists of two independently operating, spring loaded check
valves with a pressure differential relief valve located between the two
checks. The pressure drop across the first check valve is approximately
7.0 psid with no flow. The relief valve consists of a hydraulically balanced
diaphragm with the high pressure side hydraulically connected to the
upstream pressure zone. The relief valve remains closed during normal
operation. The low pressure side of the diaphragm is spring loaded to
force the relief valve to open when the pressure drop the first check and
the diaphragm is reduced to approximately 3.0 psid. A complete assembly
includes two shutoff valves and four test cocks.
IMPORTANT: You are required to thoroughly read all installa-
tion instructions and product safety information before begin-
ning the installation of this product. FAILURE TO COMPLY
WITH PROPER INSTALLATION AND MAINTENANCE
INSTRUCTIONS COULD RESULT IN PRODUCT FAILURE
WHICH CAN CAUSE PROPERTY DAMAGE, PERSONAL
INJURY AND/OR DEATH. FEBCO is not responsible for dam-
ages resulting from improper installation and/or maintenance.
Local building or plumbing codes may require modifications to
the information provided. You are required to consult the local
building and plumbing codes prior to installation. If this informa-
tion is not consistent with local building or plumbing codes, the
local codes should be followed.
Need for Periodic Inspection/Maintenance: This product
must be tested periodically in compliance with local codes, but
at least once per year or more as service conditions warrant.
Replace internal components every 5 years.
Corrosive water conditions, and/or unauthorized adjustments
or repair could render the product ineffective for the service
intended. Regular checking and cleaning of the product’s inter-
nal components helps assure maximum life and proper product
function.
WARNING
!
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