6
Testing
All mechanical devices should be inspected on a regular basis to
ensure proper functioning. The assembly should be tested at the
time of initial installation, after servicing or maintenance, and at least
annually thereafter. Acceptable test procedures are published by
Foundation for Cross-Connection Control and Hydraulic Research at
the University of Southern California (USC), American Water Works
Association (AWWA), American Society of Sanitary Engineering
(ASSE Series 5000), and Canadian Standards Association (CAN/
CSA B64.10). Consult the local regulatory authority for specific
information.
Air Gap Drain
1. Before installation, check local codes. This type of drain may not
be approved for use in some areas.
CAUTION
!
This drain is intended to catch moderate relief valve
discharges due to line pressure fluctuations and minor
check valve fouling. Under certain conditions relief valves
can discharge water at rates greater than the air gap drain
capacity.
2. For an indoor installation, locate the assembly near a floor drain
sized to adequately handle discharge. A strainer before the
backflow assembly is strongly suggested.
3. After installation of backflow assembly and piping, attach the
drain funnel to the relief valve as shown in the illustration by using
the self-tapping screws provided in the kit to join the drain funnel
halves together, making sure the slots in the drain funnel align with
the tabs on the relief valve port.
If the flood sensor is in use, attach the air gap directly to the
sensor. For valve sizes ½" to 1", use air gap 909AGA (ordering
code 0881399). For valve sizes 1¼" to 2", use air gap 909AGC
(ordering code 0881376).
NOTICE
The discharge of the drain funnel is a slip-fit design. The drain funnel
is not designed or able to support drainpipe weight.
VALVE SIZE
PLASTIC
PART NO.
METAL
PART NO.
1
/
2
"
905358
905532
3
/
4
"
905358
905532
1"
905358
905532
1
1
/
4
"
905359
905533
1
1
/
2
"
905359
905533
2"
905359
905533
