18
If the boiler is not connected to a suitable flue system (not
enough height, wrong diameter of the chimney, dirt or heavily
polluted boiler), there is a possibility that fire can spread from
the burner into the silo.
Note all Flues must be to Building Regulations Ap-
proved Document J.
A part of the combustion air supply is led through the screw
channel and thus prevents backfire in the pellet silo. This air
current is present at all times during operation but if the flue
gas/chimney system is badly designed or heavily polluted, the
air supply may not be enough to stop the fire spreading up the
auger feed.
A thermal valve and a probe are mounted on the boiler ex
works. If a temperature of 95 °C or more is measured by the
inbuilt thermal valve (in the auger feed) it is activated and re-
leases water (from a pre charged vessel) extinguishing the fire
The installer must provide a water supply to the thermal valve
(1/2“ connection) and comply fully with regulations in force .
Fire Prevention of the Biotec
COMMISSIONING
THERMAL VALVE
Boiler auger showing the thermal valve
and probe
The commissioning of the Biotec boiler may only be car-
ried out by STREBEL or an experienced installer with the
approval of Strebel If the start-up is not carried out cor-
rectly, the boiler and the system can be damaged or
destroyed and be un-repairable.
Injury could result from non observation of this manual
and general health and safety rules
This manual lists many items that should be checked
before commissioning
Commissioning the Biotec Boiler
Precautions for the first commissioning
1.) Check if the red main switch is off
2.) Disconnect the boiler from the power supply.
3.) Check that the following parts are installed profession-
ally and working correctly
- All mechanical parts of the boiler including burner and
firebricks, fan, boiler pump and circuit pump/pumps and
safety valve. Check the Hydraulic scheme complies with
the examples shown on page 10, 11, & 12
4.) Check all electrical components, connections and de-
vices for correct installation IE gear motor, fan, controller
and display.
- protect all unused connections,
- check earthing
- check the power supply.
Risk of electric shock
Actions required after thermal valve release
1.) Disconnect the boiler from the power supply.
2.) Remove the screw and gear motor.
3.) Remove wet or damp pellets from the silo and the screw
channel.
4.) Remove residual water and dry all system parts.
NOTE Moisture can cause electrical shorts.
5) Remount the screw and gear motor.
6 )Re fill the silo with dry pellets
7.) Connect to the power supply and test.
If wet or damp pellets are not removed completely the screw
and motor may jam. The manufacturer rejects responsibility
and the warranty expires if material damage occurs because
of such failures.
Thermal valve
probe
STRE-
Programming the Control should be carried out before
lighting the Boiler.
