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Working principle of the water heater
18 Instruction manual SGE
2
gis
Temperature protection for solar heating system
2.7 Safety of the solar
heating system
2.7.1 Expansion vessel
The solar heating system must be equipped with an expansion vessel. An
expansion vessel serves to limit pressure variations in the system. The
expansion vessel in the solar heating system can withstand a maximum
pressure of 600 kPa (6 bar). The supply pressure to the expansion vessel
depends on the static head of the system.
The system is protected from overpressure by an expansion
valve (2.7.1 "
Expansion vessel") as well as the expansion vessel.
2.7.2 Expansion valve
The solar heating system is equipped with an expansion valve. The expansion
valve monitors the pressure in the solar heating system. Should the pressure
become higher than 600 kPa (6 bar), the valve will open. The hot water can now
flow out of the installation. The valve remains open until the unsafe situation has
passed, i.e. until the pressure has fallen back to below 600 kPa (6 bar).
Note
Because a closed system is pressurized and is not filled automatically, the
system will have to be filled (5 "
Filling") again when the expansion valve has
been activated. A system with a drain-back tank is not pressurized and does not
have an expansion valve.
Protection Description
Maximum temperature:
- S
1
> 130°C
The pump of the solar heating system switches off
when the temperature of the heating fluid at S
1
exceeds the maximum value. The solar heating
system enters error mode. The error is also visible
on the display of the SGE water heater