Ambirad COBRA CB40 Manuel d'installation, d'utilisation, de maintenance et d'entretien - Page 8

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9 Flue connection

Flue technical details

Model

Gas type

Mass flow rate of flue gases (kg/s)

Flue gas temperature (˚C) @ flue outlet

Flue pressure (Pa) Positive

Figure 5

C o n n e c t i o n

Air Inlet

to Fan

Flue Outlet

The flexible duct supplied MUST be

fitted between re-circulation air and fan

spigot with pipe clamps as provided.

The Cobra heater may be installed with or

without a flue to the atmosphere

providing the air supply and building

ventilation requirements as stated in BS

6896: 1991 are complied with and

providing due consideration is given to the

possibilities of condensation forming on

cold surfaces when used as an unflued

heater.

Unflued installation

For unflued heaters (UK Only) a fan baffle

must be attached to the fan outlet.

(Part No 201301).

Permanent ventilation required is as

follows:

Natural ventilation

(To be fitted at high and low level with

minimum distance between 3m).

Low level, when air change rate is less

than 33m

/h/kW of total rated input,

either: 1.4cm

for each 1m

/h/kW below

33m

/h/kW or 46cm

/kW of total rated

input.

High level, above areas where personnel

are working is as above.

Mechanical ventilation

Minimum proven air flow is 33m

total rated heated input.

CB40

Natural Gas (G20)

0.0185

If the heater is installed without a flue,

ensure that combustion gases do not

impinge on combustible materials. The

maximum permitted temperature for such

materials is 50˚C. EN416.

Flued installation

The Cobra heater may be installed with a

fixed flue. A flue kit fitting (supplied as an

optional extra by the manufacturer) must

be fitted to the flue exit, this kit connects

from the flue outlet to a 5" adaptor. The

flue fitting is designed to accept either 5"

single wall or 5" twin wall.

Propriety twin wall metal joints should be

sealed with heat resistant caulking and

faced off with fire cement.

The flue pipe should be adequately

supported at regular intervals from the

building structure and terminated

externally with a British Gas Tested and

Certified terminal.

The maximum flue length is 7m and the

maximum number of bends is two on

individually flued appliances. The flue may

be installed vertically or horizontally, but

must be terminated vertically. All

connections in the flue pipe must be

properly sealed.

Natural ventilation

(Preferably at low level)

Up to and including 60kW: 4.5cm

Over 60kW:270cm

of 60kW total rated input.

Forced ventilation

Minimum proven air flow is 2.35m

of total rated input.

For detailed information please refer to BS:

6896:1991, Installation of Gas Fired

Overhead Radiant Heaters for Industrial

and Commercial heating (2nd and 3rd)

family gases.

/h/kW of

240

120

/kW.

+ 2.25cm

/kW in excess

/h/kW

For calculation method for flue sizing see

Appendix 1 on page 14.

For Herringbone flued heaters see section

14.