boiler – see figure no.7. The connection must be tight and prevent accumulation and flow of the
condensate into the boiler. Length of the smoke conduit shouldn't be longer than 3 meters,
furthermore its drop in boiler direction should be minimum 10º, while optimum drop is 30º ÷ 45º.
Thermal insulation with thickness at less 25 mm is recommended to be applied along the whole
length of the chimney connection. Prior to operation it is very important to dry and heat the new
chimney.
While the boiler is working chimney draft in any circumstances mustn’t exceed 20 Pa!
In order to provide proper chimney draft, the smoke conduit must be equipped with a flap to
regulate draft. The chimney liner itself should be equipped with a chimney draft regulator, located
beneath a connection of the smoke conduit and the chimney liner.
Fig. 7 The Holz Master boiler chimney connection
Holz Master Manual
wer. 22/05/2012/EN/V1.0
HKS LAZAR
str.22
Flue collar
HM 20
: Ø160 ÷ Ø180
Thermal
insulation
Chimney draft
louver
Condensate
removal system
Draft regulator
