hergom CRAFTSBURY Installer Manual page 5

Cowls
There is a wide range of cowls for chimneys.
It is important that it be well secured and the distance from the chimney is at least the same as
its diameter.
Draught cutting valve
• In general, in a correct installation it is not necessary to fit a draught cutting valve.
• Some installations nevertheless may be benefited by having a draught cutting valve, such as
in tall chimneys that may create stronger draughts than normal.
• In any case the draught cutting valve may help to regulate the draught. A solid fuel appliance
requires a draught of between 1,5 and 2,5 mm c.a. (See the manufacturer's characteristics)
(See technical data Page 28).
• Should the chimney draught be higher, the installation of a draught cutting valve is
recommended.
• The draught valves should never totally shut out the smoke passage. A minimum of a 20%
of the passage must be kept always free.
Coverings, protectors, ...
• Respect the distances to the combustible areas of the heater and the chimney duct,
recommended by the manufacturer.
• If this is not possible, shield these materials with appropriate protectors.
• There are special protectors to fit on the combustible walls when the chimney connector
passes near or through them. Your mission it to protect the wall from the fire.
• You must install a wall protector, when you install a chimney connector through a
combustible wall, or near it, and that may be susceptible to deterioration.
• The insulating bushings internally protect the combustion wall. You must use this part when
connecting your chimney through walls or roofs.
Chimney Duct
The chimneys for solid fuel appliances, must be built with brickwork, or prefabricated with
materials that withstand high temperatures.
Therefore if you are going to build a chimney for your heating appliance, you have two
alternatives:
There are no great differences regarding the performance and operating between a brickwork
chimney and a metal one.
Whenever possible, place your chimney inside the house to obtain a better draught, and
accumulate less creosote, leading to a longer working life.
Do not install an appliance unless you are absolutely sure the chimney is valid to be used.
Before installing the appliance, examine the chimney to detect any cracks, bad connections,
oxidation, lost pieces of cement, or other deterioration and obstruction signs.
Ensure the chimney size is adequate for your appliance. Seek advice on the dimensions
recommended by the manufacturer.
To use a smaller or excessively larger chimney, may make the heating appliance not operate
adequately, contributing to the creosote formation.
• Brickwork Chimneys.
• Metal Chimneys
•