Honeywell GmbH
5
MU1H-1301GE23 R0512
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
Diaphragm safety valves of this type are directacting safety
valves in which the disc is pushed up by the pressure from the
system against a spring which is holding the valve closed. If
the opening force exceeds the force exerted by the spring,
then the valve disc is lifted off the valve seat and the valve
discharges the medium. In accordance with the requirements
of the standard, the full discharge capacity of the valve will be
achieved when the system pressure climbs to no more than
10% above the set pressure of the valve. Full shutoff must be
achieved if the system pressure falls to below 80% of the
nominal set pressure of the valve.
3. Application
For closed water heaters in compliance with DIN 4753, Part 1
and DIN 1988. Tested to TRD 721 for pressure range 2.0 bar
to 10.0 bar.
4. Technical data
5. Options
6. Scope of delivery
The safety valve comprises:
• Angled housing
• Safety valve exchange insert, approved and comprising
screw-in section with hexagon, spring bonnet, security cap
with certification and rating plate, venting knob, sealing
disc, diaphragm, setting spring
7. Assembly
7.1. Installations Guidelines
• Safety valve must be installed in the cold water supply
pipework before the water heater
• The installation must be carried out so that:
- no shut-off fittings, restrictions or strainers are located
between safety valve and heat generator
- Good access is provided for service and maintenance
- The safety valve is fitted above the top of the water
heater to avoid the need for draining down when
exchanging the safety valve insert
• If there is no drainage facility in the room where the heater
is installed, then the safety valve may be fitted in an adja-
cent area. DIN 1988, part 2 is to be observed
Medium
Water
Installation positionHorizontal with safety cap pointing up
Opening pressure Factory preset to 6.0, 8.0 or 10.0 bar
Special settings between 2.0 bar and
10.0 bar are also available
Subsequent alteration of the setting is not
permitted and is impossible without
destroying the security cap
Operating tempe-
rature
Max. 95 °C
Connection size
1
/
2
" - 11/
4
"
Valve size is defined by the size of the inlet connection
SM152-...AA
Not chrome plated, 6.0 bar
SM152-...AB
Not chrome plated, 8.0 bar
SM152-...AC
Not chrome plated, 10.0 bar
SM152-...BA* Chrome plated, 6.0 bar
SM152-...BC* Chrome plated, 10.0 bar
SM152-...Z
special setting, when ordering, be sure to
indicate set pressure
’ Connection size 1/2“ only
Special Versions available on request
Connection size