La Nordica Focolare 80 Bifacciale Hybrid [21/76] Chimney cap

This valve must be opened (and therefore completely pushed), in detail, for the combustion of wood, so that unburnt carbon can be

subject to a post-combustion, increasing the yield and assuring the cleaning of the glass (see chapter NORMAL OPERATION).

It is possible to get the air SECONDARY directly from outside through a exible tube (reproof NOT furnished

Picture 14 at page 67 Ref B1). It is necessary to remove the underlying semi-blanks. (see Ref a or a1).

The adjustment of the registers necessary to reach the rated caloric yield is the following one:

Fuel PRIMARY air SECONDARY air TERTIARY AIR

Focolare 80 Bifacciale Hybrid Wood Closed Open /

Focolare 100 Bifacciale Hybrid Wood Closed Open /

5. FLUE

• observe the technical data of the instructions manual;

Should the ues have a square or rectangular section, internal edges must be rounded with a radius not lower than 20 mm. For the

rectangular section, the maximum ratio between the sides must be = 1.5.

A too small section causes a decrease of the draught. It is suggested a minimum height of 4 m.

The following features are forbidden and therefore they endanger the good operation of the device: asbestos cement, galvanized steel,

rough and porous internal surfaces. In Picture 3 at page 62 gives some examples of execution.

The minimum section must be 4 dm

2

(for example 20 x 20 cm) for devices whose duct diameter is lower than 200 mm or 6.25 dm

2

(for example 25 x 25 cm) for devices with diameter greater than 200 mm.

The draught created by the ue must be sufcient, but not excessive.

5.1. CHIMNEY CAP

The draught of the ue depends also on the suitability of the chimney cap.

Therefore, if it is handicraft constructed, the output section must be more than twice as big as the internal section of the ue.

Should it be necessary to exceed the ridge of the roof, the chimney cap must assure the discharge also in case of windy weather

(Picture 5 at page 63 - Picture 6 at page 64).

The chimney cap must meet the following requirements:

• have internal section equivalent to that of the stack.

• have a useful output section twice as big as the ue internal one.

• be manufactured in such a way as to prevent the penetration of rain, snow, and any other foreign body in the ue.

• be easily checkable, for any possible maintenance and cleaning operation

condensate produced in the initial start-up phases and/or the excessive gripping of soot and moreover it avoids the slowing down of the

smokes at output.

The failed tightness of the connection can cause the malfunction of the device.

The internal diameter of the connection pipe must be equal to the external diameter of the smokes stub pipe of the device. This is assured

by the pipes complying with DIN 1298.

For a better working of the appliance, it is suggested to have a ue draught of 12 Pascal (=1.2 mm of column of water).

The measurement has always to be carried out with hot device (rated thermal performance).

When the depression exceeds 17 Pa (=1.7 mm of column of water), it is necessary to reduce the same by installing an additional draught

regulator (buttery valve) on the exhaust pipe or in the chimney, according to the regulations in force.

IMPORTANT: When using metallic pipes, they must be insulated with proper materials (coatings in insulating bers resistant up