13
All flue materials should be corrosion
resistant i.e. stainless steel or galvanised
and must include a tested and approved
terminal to BS 5440 part I.
If the flue passes through any combustible
material measures must be taken to
protect against the possibility of fire.
All flues must terminate in free air space
approx. 1.5 metres from any vertical
surface of structure i.e. chimney stacks,
roof parapets, etc. If an existing chimney
or flue is to be used this should be swept
clean and be free of debris before an
approved liner is installed and connected
to the water heater.
2.1.5
Flue down draught safety
device
The draught diverter has already been
provided with a temperature probe
ex factory for signalling returning flue
gases. The probe of the down draught
supervision must remain installed on the
draught hood.
Connect the slide connectors of the down
draught supervision to the thermocouple
(see Figure 5) and install the head of the
down draught supervision in the bracket;
see Figure 5. The draught hood must be
positioned in its normal place with the
temperature probe at the front of the
boiler. Pass the wiring of the temperature
probe through the cable duct.
Note
The screws with which the down draught
supervision has been mounted in the
bracket are already in the bracket.
Important
The capillary tube of the draught diverter
should not show any sharp buckles or
kinks as this may result in damage and
subsequent failure of the water heater
The T.r.s. should never be put out of
operation. The reentry of flue gasses
may cause poisoning.
Figure 5 - Down draught supervision
installation
IMD 0422
IMD 0422
