Honeywell NK300S Einbauanleitung Seite 6

1. Safety Guidelines
1. Follow the installation instructions.
2. Use the appliance
• according to its intended use
• in good condition
• with due regard to safety and risk of danger.
3. Note that the appliance is exclusively for use in the
applications detailed in these installation instructions. Any
other use will not be considered to comply with
requirements and would invalidate the warranty.
4. Please take note that any assembly, commissioning,
servicing and adjustment work may only be carried out by
authorized persons.
5. Immediately rectify any malfunctions which may influence
safety.
2. Description of function
The refilling combination combines backflow preventer,
pressure reducing valve and ball valves in one appliance.
Function backflow preventer
The backflow preventer is a safety device in accordance with
EN 1717 to protect the quality of potable water against back
pressure, back flow and back syphonage of non-potable
water from plants and connected equipment..
The backflow preventer is separated in three chambers (inlet,
middle and outlet chamber).
If no water is drawn from the downstream system, the
backflow preventer is in normal position. The up- and
downstream check valves and the discharge valve are
closed.
If water is drawn from the downstream system, the backflow
preventer is in flow position. The check valves up- and
downstream are opened and the discharge valve is closed.
The backflow preventer changes to shut-off position (back
pressure) if the differential pressure between middle- and
inlet chamber falls under 0.14 bar. The check valves are
closed and the discharge valve is opened.
Function pressure reducing valve
The pressure reducing valve reduces the inlet pressure to the
desired set-pressure on the outlet side.
The pressure reducing valve works according to the force
comparison principle. The force of a diaphragm operates
against the spring force of the regulating valve. If the outlet
pressure and therefore diaphragm force fall because water is
drawn, then the greater force of the spring causes the valve
to open. The outlet pressure then increases until the forces
between the diaphragm and the spring are equal again.
The inlet pressure has no influence on the regulation of the
pressure reducing valve. Inlet pressure fluctuation does not
influence the outlet pressure, thus providing inlet pressure
balancing.
The refilling combination can be connected in accordance to
DIN EN 1717 constantly by hose line or piping. (KTW
Honeywell GmbH
GB
approval for hose line neccessary).
In order to prevent an uncontrolled refill of the heating system,
the shut off valvemust be closed after the filling procedure..
3. Application
Medium
Inlet pressure
Outlet pressure
Liquid category
Backflow Preventer BA
4. Technical data
Installation position
Operating temperature
Connection ball valve
Backflow preventer
Connection size discharge 40 mm
Connection size
5. Scope of delivery
The refilling combination consists of:
• Shut off valve, up- and downstream
• Complete backflow preventer with discharge connection,
valve cartridge (incl. integrated check valve and discharge
valve, upstream), integrated strainer upstream (mesh size
approx. 0.2 mm), check valve downstream and three test
points
• Complete pressure reducing valve with valve insert (incl.
diaphragm and valve seat), spring bonnet (incl. adjustment
screw), adjustment spring and pressure gauge
6. Options
NK300S-1/2A = Standard version with threaded connection
R / "
1
2
7. Assembly
7.1. Installations Guidelines
It is necessary during installation to follow the installation
instructions, to comply with local requirements and to follow
the codes of good practice.
• Install in horizontal pipework with discharge connection
directed downwards
• The installation may not take place in areas or ducts where
poisonous gases or vapours may be present or where
flooding can occur
• The installation environment should be protected against
frost and ventilated well
• The installation location has to be easily accessible
- Simplified maintenance and cleaning
- Pressure gauge at the pressure reducing valve can be
read off easily
6
Water
min. 2.0 bar
max. 10.0 bar
1.5-4 bar adjustable, preset to 1.5 bar
4 (toxic, highly toxic, tumourigenic,
radioactive materials)
horizontal pipework with
discharge connection directed
downwards
max. 65 °C
G / "
1
4
/ " external threads
1
2
MU1H-1556GE23 R1114