Honeywell GmbH
5
MU1H-1225GE23 R0616
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 appli-
cations detailed in these installation instructions. Any
other use will not be considered to comply with require-
ments 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
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 atmos-
phere. There is no possibility to control the safety arrange-
ment 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
- 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 upst-
ream to ensure the correct function of the device.
- 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 connection
directed downwards
• Note flow direction (indicated by arrow)
• 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 (WRAS: max. 60°C)
Discharge pipe
connection
HT 40
Approvals (DN15)
KIWA-UK
KIWA
WRAS
BELGAQUA
NF
tested according to EN 14367
Noise class 1
DN15
Noise class 2
DN20
The rules of the drinking water regulation must be
considered during the assembly!