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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 com-
ply with requirements.
4. All assembly operations should be carried out by
competent and authorised personnel.
5. Immediately rectify any malfunctions which may in-
fluence safety.
2. Functional description
2.1 Generally
The refilling combination serves automatic filling and
refilling from closed heating systems to DIN EN
12828:2003.
The refilling combination combines backflow prevent-
er, pressure reducing valve and ball valve in one appli-
ance.
The backflow preventer is a safety device in accord-
ance with DIN 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 non return valves and the discharge valve
are closed.
If water is drawn from the downstream system, the
backflow preventer is in flow position. The non return
valves up- and downstream are opened and the dis-
charge valve is closed.
The backflow preventer change to shut-off position
(back pressure) if the differential pressure between
middle- and inlet chamber falls under 0.14 bar. The up-
stream non return valve is closed and the discharge
valve is opened.
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 oper-
MU1H-1229GE23 R0905
GB
ates 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 (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 balanc-
ing.
The refilling combination can be connected in accord-
ance to DIN EN 1717 constantly by hose line or piping.
In order to prevent an uncontrolled refill of the heating
system, the shut off valvemust be closed after the fill-
ing procedure..
2.2 Construction type
Application and construction type in accordance
i
with DIN EN 1717
3. Application
Medium
Inlet pressure
Outlet pressure
Liquid category
Backflow Preventer
4. Technical data
Installation position
Operating temperature
Minimum pressure drop
Pressure reducing valve
Connection ball valve
Backflow preventer
Connection size
Discharge
Connection sizes
5. Scope of delivery
The refilling combination consists of:
• Ball valve, up- and downstream
• Complete backflow preventer with discharge con-
nection, valve cartridge (incl. integrated non return
valve and discharge valve, upstream), integrated
strainer upstream (mesh size approx. 0,5 mm), non
return valve downstream and three ball valves with
closing cap
7
Water
min. 1,5 bar
max. 10,0 bar
1,5-6 bar adjustable
4 (toxic, highly toxic, tumouri-
genic, radioactive materials)
horizontal pipework with
discharge connection
directed downwards
max. 65°C
1 bar
G 1/4"
HT 50
1/2" AG
Honeywell GmbH
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