Safety Equipment To Protect Against Overfilling With Fuel And Burn-Back; Automatic Extinguishing Device (Sle) - Viessmann VITOFLEX 300-UF Technical Manual

Design information

9.8 Safety equipment to protect against overfilling with fuel and burn-back

Automatic extinguishing device (SLE)

The purpose of the automatic extinguishing device on the feed is to
safely prevent burn-back in the event of a fault, e.g. a power failure.
The automatic extinguishing device is fitted with a 25 l extinguishing
water tank and a float switch. In the event of excessive temperature,
the feed screw conveyor is flooded just enough to ensure the system
is safe. The float switch monitors the fill level or level of the extin-
guishing water tank. If the level is not reached, the solid fuel boiler
shuts down and sets a fault message. For safety reasons and in
9
order to avoid damage caused by flooding, it is not advisable to con-
nect the extinguishing device directly to the water mains (cold water
supply).
Extinguishing device with extinguishing water container
For part no., see pricelist
A
B
D
A N25 fill level monitoring
B 25 l extinguishing water container
C Material supply
D Water valve
Viesmann
92
(cont.)
C
Standard delivery:
■ Danfoss AVTA extinguishing valve, adjustable 50 - 90° with dirt
trap
■ Extinguishing water container, 25 l, with retainer and water level
monitoring (float switch)
Note
The automatic extinguishing device is included in the standard deliv-
ery of the boiler.
Note
■ Valve setting 50 - 90 °C
3 corresponds to approx. 80 °C
■ The lines must be secured in metal pipes (½").
VITOFLEX 300-UF