Certikin COH110, Operating, Installation And Servicing Instruction

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5: FLUES
5:1 CONVENTIONAL FLUE
(FLUE 4" 5" OR 6")
CONVENTIONAL FLUE INSTALLATION ONLY.
FOR BALANCED FLUE INSTALLATIONS SEE SEC-
TION 5:3
The Heater requires a minimum stable draught of
0.1 mbar (0.04w.g.).
If the chimney exceeds 6m (20 feet) in length, it may
produce a draught exceeding 0.37 mbar (0.15" w.g.)
and a draught stabiliser should be fitted.
The chimney should comply with the latest edition of
the Building Regulations and BS5410: Part 1.
Factory built chimneys must comply with the Build-
ing Regulations and BS 4543 Parts 1 and 3.
Compliance with the Building Regulations does not
indicate that the chimney is satisfactory in respect of
draught conditions, or is positioned so that ‘down
draughts’ will not occur.
Special pots and cowls which might restrict the flow
of gases must not be fitted and should be removed.
A brick chimney must be fitted with a suitable stain-
less steel liner. Insulation between the liner and an
exposed chimney may be necessary to avoid con-
densation.
A flexible liner should be the same diameter as the
Flue Offtake size of the Heater - 4"(100 mm), 5" (125
mm) or 6” (150mm).
The Flue pipe, connecting the Heater to the chim-
ney should be the same diameter as the Heater Flue
Offtake and should not be more than 1.8m ( 6'-0")
long. Flue Pipes when fitted should satisfy or be
deemed to satisfy the Building Regulations.
Flue pipe bends - 90º bends should be avoided use
135° bends. Bends with soot doors should be used
where necessary.
5:2 AIR SUPPLY
CONVENTIONAL FLUE INSTALLATION ONLY
IMPORTANT
A permanent adequate supply of air is required for
combustion and correct operation of a draught sta-
biliser, if fitted.
This air enters the Heater at the rear. It must never
be blocked off. At least 25 mm clearance is required
at the rear for all models.
When the Heater is situated in a confined space or
chamber a permanent adequate supply of air is re-
quired for ventilation to prevent over heating.
5:2.1 Opening Sizes
The clear opening required for combustion only
should be based on a requirement of 550 mm²/kW,
(or 1in² per 4000 Btu/h).
When a draught stabilizer is fitted to the flue pipe or
chimney in the room in which the Heater is situated
the clear air intake should be 1100 mm²/ kW, (or 2in²
per 4000 Btu/h).
When the Heater is situated in a confined space with
Combustion or Ventilation air from outside Allow 550
mm²/kW, (or 1in² per 4000 Btu/h) at low level and in
addition 550 mm²/kW. (or 1in² per 4000 Btu/h) at
high level;
When Combustion and Ventilation air is taken from a
heated adjoining space the allowance should be 1100
mm²/kW, (or 2in² per 4000 Btu/h) at low level and in
addition 1100 mm²/kW, (or 2in² per 4000 Btu/h) at
high level. Ensure that the heated adjoining space
itself has an adequate supply of air.
When the Heater is installed in a basement or at low
level where air can enter only from high level, the
incoming air supply for Combustion and Ventilation
should be ducted to low level. A high level outlet
should be provided for ventilation.
If the Heater is installed in a room with an extractor
fan the combustion performance must not be affected
when the fan is running with all doors and windows
closed.
5:3 BALANCED FLUE HEATERS
Balanced Rear Flue Kits are available as optional
extras for each model. All models can be flued, at
low level, side or rear, and vertically to 6 metres.
Balanced Flues permit considerable choice of siting
of the Heater. Heaters may be installed in situations
where no chimney exists, where the existing chim-
ney is unsatisfactory or in outhouses.
Please note, because of pipe connections for the Pool
it may be necessary to choose a longer than Stand-
ard flue length for Left Hand flues.
It is important that care is exercised in choosing
a suitable location for the Heater and Flues.
9-04-02
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