26
Operation and function4
Description of functions
Switching on / starting the heater
When the heater is switched on, the control lamp in
the control unit lights up.
The fan starts up in the fan stage "LOW". The glow
plug starts with a 3 second delay. After approx.
45 seconds the fuel supply starts and the fuel / air
mixture in the combustion chamber ignites.
The fan switches from fan stage "LOW" to fan stage
"MEDIUM". The glow plug is switched off after
165 seconds, when a stable flame has formed.
The fan switches from fan stage "MEDIUM" to fan
stage "HIGH".
In order to quickly reach the heater’s operating
temperature, the heater is run at a higher heating
output of 5.5 kW ("POWER" control stage). If the
heater’s operating temperature has been reached,
the heating output is reduced to 4.8 kW ("HIGH"
control stage). The length of time for which the heater
is run with an increased heating output depends on
the ambient temperature.
Control in heating mode
If the intake or ambient temperature set at the control
device (10 °C up to 30 °C) has been reached, the
heater switches to the “LOW“ control level and then
continues to run with a low fan motor speed.
If the heat flow at the “LOW“ control level of 1.2 kW
or 2.0 kW is insufficient, the heater switches to the
“MEDIUM“ control level. The fan continues to run at a
low speed. In most cases the “LOW – MEDIUM –
LOW“ control at a low speed will cover the heating
requirements.
If the heat flow at the “MEDIUM“ control level is
insufficient, the heater switches back to the “HIGH“
control level. This in turn requires the full fan motor
speed.
If, in special cases, even less heat flow is required than
supplied by the heater at the “LOW“ control level, the
heater switches to “OFF“.
The fan then continues to run for approx. 4 – 5 minutes
and, only in recirculation mode, constantly ventilates
until it is restarted. The restart takes place at the
“MEDIUM“ control level at a low fan motor speed.
Ventilation mode
If the heater is set to “Ventilation“ at the control
element, the fan runs at maximum speed.
Switching off
When the heater is switched off, the control lamp goes
out and the fuel delivery is switched off.
The fan continues to run for approx. 4 – 5 minutes to
cool down.
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