7
7.
Chimney
The chimney flue must at all times develop a sufficient draught to be able to reliably exhaust
combustion products to the outside environment. A separate independent chimney flue of proper
dimensions should be installed for the chimney to function properly. The proper function of a boiler
depends on the chimney draught. The chimney draught depends on the chimney’s section area, height and
the roughness of the chimney’s walls’ internal surface. The D 28 boiler requires an operating chimney
draught of 15 Pa. No other appliance should be connected to the boiler’s chimney.
For the boiler D 28, approximate dimensions of the boiler’s section area are:
20 x 20 cm
Minimum height 7 m
ø 20 cm
Minimum height 8 m
15 x 15 cm
Minimum height 12 m
Exact dimensions of a chimney for this purpose are governed by Slovak Technical Standards STN
734201 and STN 734210. The manner in which the a chimney must be connected is determined by the
provisions of SR Ministry of Interior's Decree No. 84/1997 Coll, Articles 4 and 15.
8.
Accessories Supplied with the Boiler
Inlet Valve
1 pc
Sweeping scraper
2 pc
Operation and maintenance warranty certificate
1 pc
RT3 draught control unit plus operation manual
1 pc
9.
Possible Malfunctions and the Method of Correcting Malfunctions
Malfunction
Cause
Method of Remedy
Your boiler is failing to give
- too little water in the heating system,
- refill/add water to the system,
The required output capacity
- the heating system has not been deaerated
heating system ,
- deaerate,
- your boiler is not of appropriate size/capacity
for your hot-water system
- revise the design
- fuel of low quality, high moisture
content (over 20 %),
- use dry fuel (dry wood)
large logs
and wood waste
- poor chimney draught,
- clean your chimney, check the
connection,
- insufficiently clean boiler
- clean the boiler,
- blocked filter in the heating system,
- clean the filter.
The door is not tight fitting
- defective/damaged caulking cord,
- replace the cord.
10.
Fire Protection During the Use of Heating and Heat Consuming Devices and During
the Installation of Such Devices
A boiler must be installed in accordance with the STN 061008 standard – Fire Safety of Local
Heating and Heat Consuming Devices. During the installation of a boiler a safe distance between the boiler
and any building materials must be at least 200 mm. The same safe distance is also required for a smoke
flue located near inflammable materials of the B, C1, and C2 Combustibility Classes (for Combustibility
Classes please see the table below).
If your boiler and the smoke flue are located near any inflammable materials with C3 Combustibility
Class, the safe distance of 200 mm must necessarily be doubled!
The safe distance of 200 mm must also be doubled if the Combustibility Class of any materials
located near your boiler and/or your smoke flue is unknown.
The safe distance may be reduced to half of the normal safe distance (100 mm) when using a
thermally insulating shield/screen of a minimum thickness of 5 mm. Such shield/screen must be located 25
mm from the inflammable material it is intended to protect. The cover shield or a thermal barrier must
extend at least 150 mm beyond either of the lateral edges of a boiler (together with the smoke flue outlet)
and at least 300 mm beyond the upper edge of a boiler.
If your boiler is placed on the floor that is made of inflammable material(s), such floor must be
shielded with a thermally insulating fireproof board extending at least 300 mm beyond the ground plan on
