6 | Installation
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M1820921_en | Installation instructions Dual fuel boiler SP Dual compact
6
1.1
2
3
5
4
1.2
1.3
1.5
1.6
1.7
1.4
M
SP Dual compact
1
Thermal discharge valve
▪ The thermal discharge safety device must be connected in accordance with ÖNORM/
DIN EN 303-5 and as shown in the diagram above
▪ The discharge safety sensor must be connected to a pressurised cold water mains
supply (temperature ≤ 15°C) in such a way that it cannot be shut off
▪ A pressure reducing valve (1.5) is required for a cold water pressure of ≥ 6 bar
Minimum cold water pressure = 2 bar
1.1 Sensor of thermal discharge safety device
1.2 Thermal discharge valve (opens at approx. 95°C)
1.3 Cleaning valve (T-piece)
1.4 Dirt trap
1.5 Pressure reducing valve
1.6 Backflow preventer to prevent stagnation water from entering the drinking water
network
1.7 Free outlet without counter pressure with observable flow path (e.g. discharge funnel)
2
Safety valve
▪ Safety valve according to EN 12828 with a minimum diameter of DN15 (< 50 kW) or
DN20 (50 – 100 kW)
▪ The setting pressure must not exceed 3 bar
▪ The safety valve must be installed in an accessible place on the heat generator or in
direct proximity in the flow pipe in such a way that it cannot be shut off
▪ An unhindered and safe drainage of escaping steam or water must be ensured
3
Return temperature control
4
Diaphragm expansion tank
▪ The diaphragm pressurised expansion tank must conform to EN 13831 and hold at least
the maximum expansion volume of the system’s heated water including a water seal
▪ Its size must comply with the design information in EN 12828 - Appendix D
▪ Ideally it should be installed in the return line. Follow the manufacturer’s installation
instructions
5
We recommend fitting some sort of control device (e.g. thermometer)
6
Internal pipe connection
▪ Pellet unit outfeed to return firewood boiler (included in delivery)
