Switch Off - Webasto Air Top Evo 3900 Workshop Manual

3 Function description
3.5 Control pause
After the temperature set on the control element has been
reached the heat output is reduced.The speed of the heat-
ing and combustion air blower and the delivery rate of the
metering pump are reduced.
If, at minimum heat output, the intake temperature set on
the control element is exceeded, the metering pump is
shut down and the combustion process ended.To burn off
the flame properly the blower speed falls after 20 seconds
to low-fire rate speed and then returns to the initial speed
after 15 seconds, after which it falls to the control pause
speed in 3 minutes, where it remains for the entire control
pause.
The control pause speed is 0 if an external temperature
sensor is used.
If the temperature set on the control element is exceeded
at the temperature sensor, the heater will restart.
Changes to the setting on the control element are
implemented by the control unit and heater after a delay.
3.6

Switch off

When the heater is switched off the ON control LED on the
control element goes out. If no fuel has been transported
or if the heater is in the control pause, the heater is
switched off immediately without a slow down time.
If the fuel transport has been started it is ended when the
heater is switched off.The heater is switched off using the
same method as the transition from control mode to
control pause.The heater is then switched off
automatically.
The heater may be switched on again during the slow
down time. In this case the slow down time is completed
and the heater is then restarted.
302
NOTE
NOTE
Air Top Evo 3900/5500
3.7 Heater functions when installed in
ADR vehicles
NOTE 24V
Only for Air Top Evo 3900/5500 D heaters that are
installed in vehicles for transporting hazardous
substances (ADR).
If the heater is switched off using the control element the
slow down time remains unchanged.
A brief slow down time (max. 40 seconds) is started
automatically if
• the vehicle's engine is switched off
• a transport device is started.
After an ADR shut down process the control unit is in the
"Fault lock-out" position.Before it can be restarted the con-
trol element must be set to "OFF".
3.7.1 Extract from Directive 2001/56/EC
Annex IX
Start of extract.
ANNEX IX
3 TECHNICAL PROVISIONS
3.1. General (EX/II, EX/III, AT, FL and OX vehicles)
3.1.1. The combustion heaters and their exhaust gas
routing shall be designed, located, protected or
covered so as to prevent any unacceptable risk of
heating or ignition of the load. This requirement shall
be considered as fulfilled if the fuel tank and the
exhaust system of the appliance conform to the
provisions set out in the points 3.1.1.1 and 3.1.1.2.
Compliance with those provisions shall be verified on
the completed vehicle.
3.1.1.1. Any fuel tanks for supplying the appliance
shall meet the following requirements:
a) in the event of any leakage, the fuel shall drain to
the ground without coming into contact with hot
parts of the vehicle or the load;
b) fuel tanks containing petrol shall be equipped with
an effective flame trap at the filler opening or with a
closure enabling the opening to be kept
hermetically sealed.
3.1.1.2. The exhaust system as well as the exhaust
pipes shall be so directed or protected to avoid any
danger to the load through heating or ignition. Parts of
the exhaust system situated directly below the fuel
tank (diesel) shall have a clearance of at least 100 mm
or be protected by a thermal shield.
3.1.2. The combustion heater shall be switched on
manually. Programming devices shall be prohibited.
3.2. EX/II and EX/III vehicles
Combustion heaters using gaseous fuels are not
permitted.