Ames Fire & Waterworks LFC300, LFC300N Lead Free Double Check Detector Assemblies - Manual (Page 2)

2
Basic Installation Instructions
Guidelines
Most field problems occur because dirt and debris present in the system at the time
of installation becomes trapped in the check valves.
The system should be flushed
before the valve is installed. If the system is not flushed until after the valve is
installed, remove both check modules from the valve and open the inlet shutoff to
allow water to flow for a sufficient time to flush debris from the water line. If debris
in the water system continues to cause fouling, a strainer can be installed upstream
of the backflow assembly.
The Series C200 and C300 may be installed in either horizontal or vertical position
as long as the backflow assembly is installed in accordance with the direction of the
flow arrow on the assembly and the local water authority approves the installation.
The assembly should be installed with adequate clearance around the valve to allow
for inspection, testing and servicing. 12" (300mm) should be the minimum clearance
between the lower portion of the assembly and the floor or grade.
NOTICE
Assembly body should not be painted.
Horizontal Installation
Vertical Instal-
lation
WARNING !
Prior to servicing any Ames valve, it is mandatory to shut down
the water system by closing both the inlet and outlet shutoff
valves. After shutoff valves are closed, open test cock #2, #3 &
#4 to relieve pressure within the backflow assembly.
1. After #3 test cock has been opened to relieve pressure,
remove #3 test cock from housing. (Figure A)
2. Insert a #3 screwdriver through the hole on the top of the
cover sleeve and using both hands rotate the cover sleeve
approximately
1 /
4
-turn clockwise and 1 /
4
-turn counter-clock-
wise to break the sleeve O-ring seals. Using the screwdriver,
slowly slide the cover sleeve to the downstream side of the
housing. (Figure B)
3. Remove the stainless steel check retainer from the housing.
(Figure B)
4. Remove the #1 check module (Figure C) by inserting two flat
blade screwdrivers into the slots on either side of the check
module and gently pry the check module toward the
open zone.
5. Remove #2 check module with the same instructions as in
#4 above. For servicing 6" (150mm) checks see 8" – 10"
(200 – 250mm) instructions on p.3.
6. To clean or inspect either check module, insert a #3 screw-
driver through the downstream side of the check module
as shown in Figure D & E. When the screwdriver is in place,
remove the “E”-clip (Figure F) and pin connecting the structural
members and the check clapper will open with no tension.
7. Thoroughly clean the seating area. The sealing disc may be
removed, if necessary, by removing the screws connecting
the keeper plate to the clapper. The sealing disc may be
reversed and reinstalled if the elastomer is cut or damaged.
8. Wash check module and O-ring and inspect for any dam-
age. If damaged, reinstall new parts.
9. After thorough cleaning, lubricate O-ring w/FDA approved
lubricant, replace pin and “E”-clip in structural members,
remove screw driver and reinstall check modules and as-
semble housing in reverse order of these instructions.
Instructions
Figure D Figure E Figure F
Figure A Figure B Figure C
Maintenance Instructions 2 1 /
2
" – 6" (65 – 150mm)