6 | Assembly
44
M2250322_en | Installation instructions Wood chip boiler T4e 200-350
▪ Minimum diameter for the inlet to the safety valve as specified by EN 12828:
DN15 (≤ 50 kW), DN20 (> 50 to ≤ 100 kW), DN25 (> 100 to ≤ 200 kW), DN32 (> 200 to
≤ 300 kW), DN40 (> 300 to ≤ 600 kW), DN50 (> 600 to ≤ 900 kW)
▪ Maximum pressure setting in terms of the permissible operating pressure of the boiler,
see the section “Technical Data”
▪ The safety valve must be installed in an accessible place on the boiler or in direct
proximity in the flow pipe in such a way that it cannot be shut off
▪ Unhindered and safe escape of the steam or water that is released 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 heated water in the system, 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 installing some sort of monitoring device (such as a thermometer)
6
Expansion trap
▪ Its dimensions must comply with the design information in EN 12828 - Appendix E
▪ Installation in blow-out line immediately next to the safety valve
▪ At the bottom of the expansion trap, water must be discharged into an unobstructed
outlet without counterpressure where the flow path can be observed (e.g., discharge
funnel)
▪ At the top of the expansion trap, steam must be discharged safely into the atmosphere
NOTICE! The expansion trap can be omitted when an additional high-limit
thermostat (7.2) and an additional maximum pressure limiter (8.2) are integrated into
the installation
7.1
High-limit thermostat
▪ Integrated into the boiler at the factory
7.2
Additional high-limit thermostat
NOTICE! Omitted if an expansion trap (6) is integrated in the installation
8.1
Maximum pressure limiter
▪ The system is switched off when the maximum pressure in the boiler flow connection is
exceeded. As soon as the system has dropped to the specified working pressure, the
system is unlocked by activating the reset button manually.
8.2
Additional maximum pressure limiter
▪ The system is switched off when the maximum pressure in the boiler flow connection is
exceeded. As soon as the system has dropped to the specified working pressure, the
system is unlocked by activating the reset button manually.
NOTICE! Omitted if an expansion trap (6) is integrated in the installation
9
Water shortage safety device
▪ When the water level in the boiler is too low, the system is switched off; thus,
overheating of the boiler is prevented
NOTICE! Omitted if a minimum pressure limiter (10) is used in the installation
10
Minimum pressure limiter
▪ The system is switched off when the minimum pressure in the boiler’s return flow
connection drops below its preset value. As soon as the system has reached the
specified working pressure, the system is unlocked by activating the reset button
manually.
NOTICE! Omitted if a water shortage safety device (9) is integrated in the installation
