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SHT Heiztechnik,
aus Salzburg
Operating instructions
M21/HB M27/GB
Page 4
SHT Heiztechnik aus Salzburg GmbH, A-5020 Salzburg-Bergheim, Rechtes Salzachufer 40 Tel. 0662-450444-0, Fax-DW 9
Our current general terms and conditions apply.Errors, printing faults and technical changes reserved
2
Technical data
Name plate and serial number
The name plate can be found on the rear panel of the boiler.
Important information:
Ensure you retain all supplied documentation. In the event of a claim under the warranty or for the
subsequent delivery of spare parts we will always require the serial number of the boiler. Without the
serial number and date of purchase, we cannot recognize any warranty.
3
Functional description and technical features
The
tested
fully-automatic
combi
boiler
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from SHT Heiztechnik aus Salzburg GmbH consists of a
pellet combustion chamber and a split log combustion chamber made of
refractory concrete, a tubular heat exchanger with cleaning coils, electric
ignition and automatic grate de-ashing. The pellet feed into the pellet
combustion chamber is by means of IBS * tested input.
In the default setting (combined pellet and split log operation) the system
is operated automatically by the microprocessor system with associated
sensors and switches.
*
Institute for Fire Protection and Safety Research (IBS)
Mode of operation:
In the pellets/split logs automatic operating mode everything runs fully automatically, therefore no
further adjustments need to be made to the boiler. The boiler runs as a fully automatic pellet heating
system (only the pellet burner operates) until split logs are placed in the boiler. After the split logs are
placed in position they are ignited automatically by the pellet burner and burn for their individual
duration of combustion. During the full combustion period of the split logs the pellet burner is turned
off. If the system (heating & hot water) still requires energy after the combustion of split logs then the
pellet burner re-ignites automatically.
Furthermore, the installation offers an additional mode, pure split log operation (gasifying wood boiler).
In this operating mode, manual or automatic ignition can be implemented via the pellet burner.
The supply of fuel (pellets) is implemented from the right via a feed channel. Using a variable-speed
flue gas fan, primary air is supplied to the fuel through the grate, and secondary air at the outlet of the
combustion chamber to the combustion gases. The combustion gases flow through the split log fuel
chamber and are directed through the tubular heat exchanger to the flue.
At regular intervals an electrical drive empties the ash from the pellet combustion chamber into the
underlying ash pan.
The supply of fuel (split logs) is via manual insertion into the fuel chamber. The air supply for split log
operation is ensured by primary and secondary air ports. The combustion gases also flow via the
tubular heat exchanger to the flue.
The entire combustion control is via a lambda probe and a flame temperature sensor, the power control
via a boiler temperature sensor. Total air management is achieved via a primary and a secondary air
valve and variable speed induced draught. This ensures a stable negative pressure in the combustion
chamber and the conveying of the combustion gases to the chimney.
The tubular heat exchanger is cleaned by means of an integrated automatic cleaning mechanism (at
the TDA 15/25 manually with the lever).