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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 instruc-
tions. Any other use will not be considered to comply
with requirements and would invalidate the
warranty.
4. Please take note that any assembly, commis-
sioning, servicing and adjustment work may only be
carried out by authorized persons.
5. Immediately rectify any malfunctions which may
influence safety.
2. Functional description
NK300soft consists of a refilling combination that
combines a backflow preventer, pressure reducing
valve and ball valve and a softening unit.
Function backflow preventer
The backflow preventer is a safety device in accor-
dance with EN 1717 to protect systems against back
pressure, back flow and back syphonage of non-
potable water into service pipe, plants and equip-
ments.
The backflow preventer is separated in three cham-
bers (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 pressure on
the inlet side (admission pressure) to the level of the
desired pressure on the outlet side (outlet pressure) in
individual cases.
The pressure reducing valve functions on a force
equalisation 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
MU1H-1546GE23 R0908
GB
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 (admission pressure) has no influ-
ence on the regulating valve of the pressure reducing
valve. Inlet pressure fluctuation does not influence the
outlet pressure, thus providing inlet pressure balan-
cing.
The refilling combination can be connected in accor-
dance to DIN EN 1717 constantly by hose line or
piping. (KTW 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..
Function softening unit
The softening unit, installed directly after the refilling
combination, works according to the ionic exchange
principle and replaces the alkaloids of soil such as
calcium and magnesium with sodium ions.
Dependant on the regional water hardness, the water
is either partially softened (<8°dH) or completely
softened (<0,11°dH) by adjusting the blending unit.
3. Application
Medium
Inlet pressure
Outlet pressure
Liquid category Backflow
preventer BA
Suitable for heating systems with the following
materials: steel, copper, copper alloys and plas-
tics.
Treated water has modified corrosive chemical
parameters. Conditioning by means of inhibi-
tors is to be provided for separately.
4. Technical data
Installation position
Operating temperature
k
-value
vs
Connection ball valve
Backflow preventer
Connection size
Discharge
Connection size
13
Water
max. 10.0 bar
1.5-4 bar adjustable, preset
to 1.5 bar
4 (toxic, highly toxic, tumou-
rigenic, radioactive mate-
rials)
horizontal pipework with
discharge connection
directed downwards
max. 30 °C
0.45 m
/h
3
G
/
"
1
4
HT 50
/
" External thread
1
2
Honeywell GmbH
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