19
installation
Fitting the Twin Pipe (Ø80 / 80)
Note: See table for maximum and minimum ue runs.
Where it is not possible to terminate the ue within the distance
permitted for coaxial ues, the twin ue pipe can be used by
tting a special adaptor to the ue connector and using the aper-
ture for the air intake located on top of the combustion chamber.
Always ensure that the ue is adequately supported, using one
ue bracket per extension and avoiding low points. (MTS supply
suitable clamps as Part No. 705778).
To utilise the air intake it is necessary to:
1) Take the air intake cover o the top of the appliance
2) Assemble the ange on the header supplied with the boiler
3) Insert the header on the tube or the elbow up until the lower
stop (you do not have to use the washer).
4) Insert the elbow/header in the boiler air intake hole and fasten
it with screws.
The twin ue pipes can be tted with or without additional
elbows and need no clamps, simply ensure that the red o-ring is
inserted in the female end of the ue pipe and push the exten-
sion piece fully into the previous section of ue pipe or elbow,
check that the o-ring is not dislodged when assembling the ue
(greasing the seal will aid assembly).
Twin pipe can also be converted back to Coaxial ue to enable
vertical termination with a coaxial kit by using the pipe bridge
(Twin - Coaxial Adaptor - Part No. 3318089). When running the
twin ue pipe vertically.
It is not possible to terminate concentrically horizontally. Termi-
nation is only possible with separate air and exhaust terminals.
When siting the twin ue pipe, the air intake and exhaust
terminals must terminate on the same wall, the centres of the
terminals must be a minimum of 280 mm apart and the air intake
must not be sited above the exhaust terminal (refer to Fig. 10).
The air intake pipe can be run horizontally, however, the terminal
and the nal 1 metre of ue must be installed either horizontally
or with a slight fall away from the boiler to avoid rain ingress.
It is also strongly recommended that the air intake pipe run be
constructed of insulated pipe to prevent condense forming on
the outside of the tube.
The maximum permissible ue length for twin ue is dependent
on the type of run used (see table on page 21).
For further information relating to ue runs not illustrated, please
contact the Technical Department on 0870 241 8180.
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