Honeywell GmbH
5
MU1H-1225GE23 R1109
GB
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
Backflow preventers are divided into three zones -
inlet-, middle- and outlet zone.
When the differential pressure between inlet zone and
middle zone drops below under 10 % of inlet pressure
the backflow preventer discharges by venting the
middle zone to atmosphere. There is no possibility to
control the safety arrangement by measuring.
3. Application
4. Technical data
5. Scope of delivery
The backflow preventer consists of:
• Housing
• Integral strainer
• Valve cartridge
• Outlet check valve
• Connection fittings
• Discharge connection
6. Assembly
6.1 Installations Guidelines
• Install shutoff valves before and after backflow
preventer
• Install in horizontal pipework with the discharge
valve downwards
• Ensure good access
o Simplifies maintenance and inspection
• Backflow preventers of this type have an integral
strainer which protects the device from the ingress
of dirt. With highly polluted water a fine filter should
be installed upstream to ensure the correct function
of the device.
o This protects the appliance against dirt
• Do not install in places where flooding can occur
• The installation environment should be protected
against frost and ventilated well
• Install discharge pipework which has adequate
capacity
6.2 Assembly instructions
1. Thoroughly flush pipework
2. Install backflow preventer
• Install in horizontal pipework with discharge connec-
tion directed downwards
• Note flow direction (indicated by arrow)
o Install without tension or bending stresses
3. Attach drain pipe to discharge connection (plastic
pipe HT 40)
Medium
Water
Maximum inlet
pressure
max. 10.0 bar
Minimum inlet pressure
1.5 bar
Installation position
Horizontal with discharge
valve downwards
Operating temperature up to 65 °C
Discharge pipe
connection
HT 40
Approvals
KIWA-UK
KIWA
WRAS
BELGAQUA
NF (DN15)
tested according to prEN
14367 (DN15)
Noise class 1
DN15
Noise class 2
DN20
The rules of the drinking water regulation must
be considered during the assembly!
