Honeywell GmbH
5
MU1H-1247GE23 R0614
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
BA type backflow preventers are divided into three pressure
zones. The pressure in zone
c
is higher than in zone
d
,
which in turn is higher than in zone
e
. A discharge valve is
connected to zone
d
which opens at the latest when the
differential pressure between zones
c
and
d
drops to 0.14
bar. The water from zone
d
discharges to atmosphere, both
check valves close and therefore separate zone
d
from zone
c
and
e
. In this way the danger of back pressure or back
syphonage into the supply network is prevented. The pipe-
work connection is interrupted and the drinking water network
is protected.
3. Application
4. Technical data
5. Scope of delivery
The backflow preventer consists of:
• Upper housing part with integrated shutoff facility and test
socket incl. plug
• Complete tested replacement unit with
- rotatable lower housing part with test socket incl. plug
- Strainer (mesh size 0.5 mm)
- Valve cartridge with integral check valve and discharge
valve
- Outlet check valve
- Retaining clip
- Seal brackets
• Threaded adapter
• Two test sockets (third is integrated in the blind plug of the
optionally available maintenance set WS295STN)
6. Options
7. Assembly
7.1. Installations Guidelines
• Direct installation to 1/2" wall socket with discharge
connection downwards
• 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.
• The installation location should be protected against frost.
For use on outside taps, the backflow preventer has to be
dismounted if there may be danger of frost.
7.2. Assembly instructions
1. Close shutoff valve upstream the valve
2. Install to 1/2" wall socket with discharge connection
downwards
3. Install threaded adapter 1" IG to 3/4" AG if necessary
4. Install discharge connection if necessary
5. Open shutoff valve upstream the valve
Medium
Drinking water
Maximum inlet pressure
10.0 bar
Minimum inlet pressure
1.5 bar
Installation position
Vertical with discharge valve
downwards
Max. operating temperature 65 °C
Discharge pipe connection
DN40
Nominal diameter
1
/
2
"
BA295D-1/2AS = Standard version with R1/2" (ISO 2999)
threaded connection on inlet and G1"
(ISO 228-1) threaded connection on
outlet , 1" IG to 3/4" AG threaded adapter
included