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MAINTENANCE MANUAL MODELS 825Y, 825YA, 825, 825D, 825YD & 826YD
1. The assembly should be installed in a horizontal position with a
minimum clearance of 12" between the relief valve discharge
port and floor or grade, and a minimum of 18" horizontal clear-
ance around the unit for access and ease of testing and
maintenance of the relief valve.
2. Approval agencies do not recommend installation of a
Reduced Pressure Assembly in a pit. Flooding of the pit can
result in cross connection contamination. If local codes permit
installation of a Reduced Pressure Assembly in a pit, adequate
drainage must be provided to prevent the pit from flooding
under maximum discharge conditions.
3. Placement of the assembly should be planned where water
discharged from the relief port will not be objectionable or
cause damage to property and/or equipment.
4. To be approved by the University of Southern California
Foundation for Cross-Connection Control and Hydraulic
Research (USC), the assembly must be purchased and
installed with resilient seated shutoffs to ensure bubble tight
closure for more consistent results during testing. CAUTION:
Open and close resilient seated shut-offs slowly to prevent
water hammer damage to the system and assembly.
5. Since the FEBCO Reduced Pressure Assembly is designed to
be serviced while in line, the unit need not be removed from
the line during servicing.
6. Ensure the supply water pressure does not exceed the manu-
facturer’s maximum water pressure rating of the assembly to
avoid damage to the system or the assembly caused by sys-
tem pressure. In addition, protection must be provided against
thermal water expansion, extreme backpressure and/or water
hammer.
7. Most field problems occur because dirt or debris present in
the system at the time of installation becomes trapped in
the first check seating area resulting in continuous discharge
from the relief valve in a static or backflow condition. THE
SYSTEM SHOULD BE FLUSHED BEFORE THE ASSEMBLY
IS INSTALLED. However, to effectively flush the system after
the assembly has been installed, remove the internal compo-
nents of both checks and open the inlet shut-off to allow water
to flow for a sufficient time to flush debris from the line and
assembly. If debris In the water system continues to cause
fouling, a strainer can be installed upstream of the assembly.
Installation Guidelines
Proper installation of the assembly is essential to the protection of the water supply
Typical Installations
Figure No. 3
Air Gap Drain
Drain Support
Flow
Wye Strainer
Figure No. 4
Flow
30" Max.
12" Min.
Air Gap
Drain
Support
3"
and
Larger
Maintain
approved
air gap
distance
Indoor Installation
