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RECOMMENDATIONS FOR DHW CONNECTIONS
Essential recommendations for safety
The hot water output may reach temperatures in excess of 60°C, which can cause
scalding! It is therefore necessary to install a thermostatic mixing valve after the
appliance.
The system must be fitted with an approved safety group, comprised of a 7 bar
safety valve, a check valve and a shut-off valve.*
Essential recommendations for the correct operation of the appliance
Flush the system before connecting the domestic hot water circuit. Refer to the
installation instructions.
Make sure to install a pressure reducing valve set at 4.5 bar if the mains supply
pressure is in excess of 6 bar.
It is recommended to install an expansion vessel in the DHW circuit to prevent the safety
valve from opening constantly and reduce the water hammer effect in the system.
If the appliance is used as a domestic hot water preparation tank, a primary
expansion vessel adapted to the boiler power/size and to the type of system must
be fitted in the heating circuit (if there is no built-in expansion vessel, or if the built-
in expansion vessel size is not sufficient).
Cold water
Hot water
Typical installation with internal DHW tank
Description
1. Isolating valve
2. Pressure reducing valve
3. Check valve
4. DHW expansion vessel
5. Safety valve
6. Drain valve
7. Grounding
8. Draw-off tap
9. Thermostatic mixing valve
1 2 3
1
8
4
5
6
7
9
Make sure to install the expansion vessel kit (accessory) provided for the Water
heater.
* For UK specific requirements for the discharge from safety valves, refer to «G3 Require-
ments and Guidance - UK Only» on page 34.
WaterMaster 25 - 35 - 45 - 70 - 85 - 120 : A1006482 - 664Y7300 • D
en
38
EN
FR
NL
ES
IT
DE
PL
RU
INSTALLATION
The safety valve kit :
Primary circuit safety valve at the back of the water heater
The expansion vessel kit (mandatory accessory):
A primary circuit expansion vessel MUST BE installed at the back of the water heater.
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