Thermo E 200 / 320 4 Heater functions
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switching threshold for starting the controlled break is set.
In addition, the burner is also switched back on again after
the controlled break at a lower switching threshold.
This prevents residual heat triggering the overheating
protection.
If the temperature rise (temperature gradient) is
again within permissible limits, the thresholds are reset to
normal values immediately (lower threshold 72°C, upper
threshold 82°C).
4.2.3 Switching off
Switching the heater off ends the combustion process.
The operating display expires and purge cycle is initiated.
The solenoid valve closes, the flame expires, the combus-
tion air fan and circulating pump continue running.
The purge cycle ends approx. after 120 seconds. The
combustion air fan is switched off.
If a malfunction occurs during purge cycle (e.g. flame
detection), the purge cycle may be shorter than 120
seconds.
During purge cycle it is permitted to switch the heater back
on. The burner will restart after a purge cycle time of 30
seconds and subsequent initial cycle time.
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