Overheating of the HTFr
Using the wrong switch setting for cooling down
− If the switch on the HTFr is set to position 0 before the furnace has cooled
down sufficiently, this may result in overheating and the triggering of a
safe state. The cooling cannot take place on setting 0 because the HTFr
is without power on setting 0, and the fan is therefore also turned off. The
HTFr must be set to level 1 to cool down.
• Set the HTFr to level 1 on the switch to cool down.
• Only turn the HTFr to level 0 once it has cooled down sufficiently.
The safety circuit ensures that the HTFr can only be commissioned under safe conditions.
The safety circuit places the machine in a safe state by interrupting the power supply to the
heating elements. The machine is automatically moved to a safe state when the following faults
occur:
• Excess current
• Excess temperature on the machine
• Fan is stationary when it should not be
• Triggering of the temperature switch on the top of the furnace
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