Honeywell R295 Einbauanleitung Seite 4

1. Installation
It is necessary during installation to comply with
local requirements, to follow codes of good
practice and to follow the installation instructions.
The installation location should be protected
against frost and be easily accessible.
1.1 Installation Guidelines
The opening pressure of the backflow
●
preventer must be correctly selected
to match the system which is to be protected.
(see section „The correct opening pressure").
● Flush connecting pipework thoroughly before
installation
● Install the backflow preventer with good
accessibility and with flow in the correct
direction.
● Install the backflow preventer only in horizon
tal pipework and with the discharge tundish
6 downwards
● A clearance of Amin must be provided above
the backflow preventer for maintenance
purposes
Rp 1 / " to 1"
2
A 100 mm
min
● It is recommended that a Y-strainer 2
(e.g. FY 30) be fitted upstream to protect the
backflow preventer against coarse dirt.
● Fit shutoff valves 1 and 5 either side of the
backflow preventer.
● Connect discharge pipe (DN 40 plastics pipe
or R1" threaded pipe) to discharge tundish 6
● The pressure gauge connection is fitted on
the inlet side of the backflow preventer
If there is a possibility, that at zero flow the
water in the downstream system may be
heated, then a safety valve must be fitted to
allow for water expansion and prevent the
pressure rising above the permitted level.
If soldered union connectors are used the
backflow preventer must not be connected
to the union connectors during soldering.
GB
1 1 / " to 2"
4
150mm
4
1.2 Commissioning
As supplied the backflow preventer is in the
shutoff position.
Commissioning should be in the following
sequence:
1. Slowly open shutoff valve 1 (when the
minimum inlet pressure is reached the
backflow preventer goes to the flow position)
2. Slowly open shutoff valve 5 . Fill and vent the
system.
3. When the system has been filled, the backflow
preventer is ready for use (the backflow
preventer is then in the flow position).
4. If the inlet pressure falls to the level of the set
pressure of the backflow preventer, then the
valve automatically goes to the shutoff position
and provides a minimum air gap of 20 mm.
5. The operating position is indicated on the
spring bonnet 3 .
● Shutoff position: Green on spring bonnet 4 is
visible.
● Flow position: Green on spring bonnet 4 is
not visible.
2. Inspection and Testing
The EN 805-6 (Specifications for installations
inside buildings conveying water for human
consumption – Part 5: Operation and
maintenance) must be regarded.
2.1 Testing of Function
● Close the valve 1 fitted before the backflow
preventer.
● Relieve the pressure in the isolated section
through the small drain off valve 7
● Visually check that the backflow preventer
goes to the shutoff position (see section 1.2.5).
2.2 Checking for Seal
Visually check that no water is emitted when
●
backflow preventer is in the flow position.