Install Instructions
Installation
The installation of backflow preventer should only be carried out by qualified personnel in accordance
with applicable codes and regulations.
The backflow preventer includes an upstream and downstream shut-off valve.
Install the unit in an accessible area which is not susceptible to accidental flooding. The equipment
is to be installed horizontally only. The air gap, complying with the ASSE 1013 standard, must be
connected in accordance with local codes. See page 9 and 10 for discharge extension pipe size and
type, sourced separately.
Before installing the backflow preventer the pipe should be cleaned with a high-capacity water jet.
In order to protect the public supply system the backflow preventer is installed after the water meter
and, to protect supplies for sanitary purposes in the internal system, it is installed where contamination
can take place, eg: centralized heating systems, garden watering systems etc.
min
1.5 ft
1.5 to 4.5 ft
2
123 4
GROUND, FLOOR, GANGWAY
Discharge air gap
Sewer tunnel
Pipe
Shut-o valve
Shut-o valve
Backow preventer valve
Discharge extension pipe* to sewer
*source extension pipe separately
Installation diagram
4