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    Spec 

Sheet 

    Fuel 

Conveyance 

System 

    Funnel 

Extraction 

System 

 

 

Köb Holzheizsysteme GmbH, Flotzbachstr. 33,  A-6922 Wolfurt, Tel. +43/5574/6770-0, Fax 65707, E-Mail: office@kob.cc 

Subject to technical changes 

8240-1

2009-03-01_GB

Funnel Extraction System up to D 6.0 m ECO 

[Art.-Nr. AP-11 / 7387794] 

Funnel Extraction System up to D 6.0 m PYR 

[Art. No. AP-21 / 7387899] 

Funnel Extraction System up to D 7.5 m ECO 

[Art. No. AP-12 / 7387958] 

Funnel Extraction System up to D 7.5 m PYR 

[Art. No. AP-22 / 7387929]

 

 
Function: 
The repeatedly proven material extraction for round silos takes place with an agitator built into the extraction housing, in 
the centre of the agitator an extraction auger is driven by a massive cardan joint. When the silo is full, the auger tends 
toward an upright position. The funnel limits the inclined position of the auger when the silo is empty. The drive is carried 
out by a helical worm gear motor to the sweeping mechanism. 
With material compacting in the extraction housing, the conveyance direction of the auger is automatically changed for a 
period of time set at the factory, as a result of increased power consumption of the drive. This loosens up the 
compacting, and a malfunction is prevented. 
 
Scope of delivery: 

Funnel  Extraction System according to the order data with drive unit 3 x 400 V, 

Automatic control of the drive for the worm spur gear motor for both rotational directions  

-

 

Safety limit switch mounted on the maintenance lid of the extraction system casing. 

 
 

Table 1: Designs and drives 

 

Up to boiler [kW]    

                  2)

 

[Art. No.]  

Boiler 
control 
system 

Motor control 

in the switch cabinet 

with: 

Pellets 
S 650 

Forest 
wood 
chips S 
200 

Shaving

S 130 

Torque

 1) 

at auger 

 
 

[Nm] 

Diameter  

Extraction circle  

on a project-by-

project basis 

 

Max[m] 

11 

7387794

 

ECO 

Electronic softstart 

 

AP- 

21 

7387899 

PYR 

Protection switch/ 

Contactor 

3000 1250 1250  Approx. 

1500 

6.0 

12 

7387958

 

ECO 

Electronic softstart 

 

AP- 

22 

7387929

 

PYR 

Protection switch/ 

Contactor 

2500 2500 2500  Approx. 

3000 

7.5 

 

1) Rotational speed/output: Project-specific and dependent on boiler capacity and fuel, dimensioning by Viessmann construction 
2) When  the silo height H = approx. 1.8 x D is exceeded, the guarantee of extraction performance is cancelled because of the danger of hang-up. (fuel-

dependent)! 

 

 
 

Additional Outlet Flange 

[Art. No. AP-Z01 / 7388520] 

 

A second connecting point for feed systems on the extraction system casing for double-boiler plants.  

 
 
Enlarged funnel

  [Art.-No. AP-Z02 / 7388042] 

 

Extra charge for funnel diameter of 3000 mm. 
Observe: funnel diameter of 3000 mm required from AP-12 to AP-22. 
 
 
 

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