RECOMMENDED CHIMNEY ARRANGEMENTS
6
Boiler House Installations
Where it is not possible to use a 15ft high chimney and
the boiler can be sited in a separate boiler house, the
Monodraught flue system may be considered.
A Code of Practice has been laid down by Trianco for this
type of installation which must be strictly adhered to for
correct operation of the boilers. Information on the
Monodraught flue systems may be obtained from:
Monodraught Flues Ltd., Unit 6 Lancaster Court,
Coronation Road, High Wycombe, Bucks. HP12 3TD
Draught Stabiliser
The draught stabiliser fitted to this boiler is designed to
cope with the excess draught produced by the average
chimney; however, in coastal areas and other places
where high winds are liable to produce exceptionally high
draughts, it may be necessary to fit an additional draught
stabiliser in the chimney to reduce the draught to an
acceptable level.
The boiler’s draught stabiliser is factory set and should not
be altered.
Blocked Flue Safety Switch
In the event of a chimney blockage the boiler should
automatically shut down to a safe condition due to the
operation of the Safety Switch. This condition is indicated
by illumination of the red ‘Fume Warning’ light on the fan
cover.
The Safety Switch is located at the top of the boiler near
the draught-stabiliser and in the event of a boiler shut
down will need resetting. It is important, however, that
the Safety Switch is only reset after the blockage has
been cleared. Push the red reset button to restart the boiler;
the warning light will then go out.
Pump Overrun Thermostat
If the boiler is employed solely for central heating and
there is no means of dissipating the residual heat by way
of a hot water cylinder or heat leak radiator, then a pump
overrun stat must be fitted to the boiler flow pipe.
Air Supply
Adequate ventilation is required to ensure that sufficient
air is available for combustion. The room in which the
boiler is installed must be provided with a permanent
fresh air opening of not less than the following:
148cm
2
- TRG 45
194cm
2
- TRG 60
258cm
2
- TRG 80
An extractor fan must not be used in the same room as
the boiler.
Chimney and Flue Connection
(See Fig. 2)
The chimney must be structurally sound and preferably
fitted with a moisture and acid resistant liner. A minimum
height of 15ft. is required with the top of the chimney
terminating in a zone not subject to down draught. The
terminal must not be fitted with any form of capping that
could impede the discharge of flue gases. A soot cleaning
door must be provided at the base of the chimney for
removal of flue deposits. The connection between boiler
and chimney must be made in cast iron or vitreous
enamelled steel flue-pipe, and any bends must have an
angle of 135 and be complete with a soot cleaning door
in class 1 stainless steel.
Note: A draught of 0.03 to 0.05 ins. w.g. is required over
the firebed when the boiler is running at its rated output.
To measure the draught without the built-in draught
stabiliser influencing the reading it is necessary to insert
a 6 or 8 mm tube through the tapping at the top of the
boiler and down one of the flue-ways, emerging about 25
mm (1”) below the bottom.
The draught should also read between 0.03 and 0.05 ins.
w.g. when the fire is slumbering with the fan off. The
reading should be taken about 15 minutes after a fan
blowing period and if in excess of 0.05 ins. w.g. then an
additional draught stabiliser may be necessary in the
flue-pipe or chimney.
