eta PelletsCompact PC33, Installation Manual

Page: 17 / 76

Safety Safety devices
17
Heat dissipation is limited by the selected
maximum flow temperature in the heating circuits
and the target hot water temperature.
Safety shutdown by safety temperature limiter
For additional safety against boiler overheating, a
safety temperature limiter is built into the boiler. When
a boiler temperature of 100 °C (tol0°/-6 °C) is
reached, the power supply to the draught fan and the
fuel intake is interrupted. When the boiler temperature
decreases back below 70°C, the safety temperature
limiter can be manually released for a restart of the
boiler.
Safety valve against overpressure
A safety valve with 3 bar opening pressure has already
been installed on the boiler at the factory. If solar or
other heat sources provide energy to the buffer
storage tank via a heat exchanger, a safety valve
(3 bar maximum) is also required on the buffer storage
tank.
Fig. 6-3: Safety valve
Normally an expansion tank that is too small or
defective, or blocked heating lines are the cause of the
safety valve activation.
DANGER!
Safety valve outlet
The safety valve outlet must be directed to the ground
in a pipe so nobody is endangered by hot water or
steam.

The safety valve outlet must be fed to the sewage
system (e.g. duct) via a clearly visible, open route
(siphon funnel), This will ensure that malfunctions,
especially a failure of the safety valve to close, can
be detected. If no connection is available to the
sewage system, the outlet must be directed to the
ground in a pipe.