Product Overview

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.
Before installing the backflow preventer the pipe should be cleaned.
To protect the main public supply system install the backflow preventer after the water meter. In an internal distribution system protect the supply side by installing
the backflow preventer where contamination can occur, for example: centralized heating systems, garden water systems, etc.
18" MIN. / 54 " MAX
water meter
water
supply to
building
from
water
main
18" MIN. / 54 " MAX
to
hydronic
system
cold
water
supply
pressure
reducing/
filling valve
discharge extension pipe,
sourced separately
Installation diagram
Inspection and maintenance
The backflow preventer is a safety device and requires periodic inspection. The first sign of poor functioning, generally caused by the presence of foreign particles
(sand or other impurities) keeping the upstream check valve in open position, is seen with a constant leakage from the discharge port. This discharge is only a
first alarm and does not mean in any way that the check valve is not safe but the backflow preventer and the upstream strainer require dismantling and cleaning.
A quick method of inspection (requires less than 15 minutes) is described in a table in the instruction sheet, shipped with the backflow preventer or available
online at www.caleffi.com.
In case of leakage from the discharge port, a strong flow of water is recommended for some minutes by turning on one or more taps. This operation is often
sufficient to flush out the foreign debris and return everything to normal conditions.