Section 7: Flue System and air Supply
Page 22
7.4 Flue System assembly
7.4.1 Boiler Flue Connection
The Grant External Vecta boiler is supplied with a flue outlet located
on the top of the boiler in the rear left corner and is designed to fit the
Grant ‘Biomass’ flue system. Refer to Figure 7-3.
Figure 7-3:
Boiler flue connection
The flue system must include the Grant Inspection Pipe (Grant Ref.
WPBOM/IP), which should be fitted to the outlet of the boiler. This
incorporates both a combustion test point and a flue inspection hatch.
Refer to Figure 7-4 and also Section 7.4.5.
Figure 7-4:
Inspection pipe
When fitting the flue to the boiler flue outlet, the lip seal supplied with
the flue component must be fitted into the groove around the inside
surface of the flue, and the locking band fitted to secure the joint.
the inspection Pipe should be positioned such that the cover
plate faces to the left, not towards the right or front of the
boiler.
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7.4.2 Joining Components
All the ‘Biomass’ system twin-wall flue components (with the
exception of the elbows) use a ‘twist lock’ jointing system. The ‘male
collar’ end of the flue component MUST always be uppermost when
fitted.
Male collar
Insulation
Female collar
Viton gasket
seal detail
Figure 7-5:
Male and female flue connections
Figure 7-6:
Twist lock joint between components
to join two components together:
All flue joints must have a lip seal gasket fitted. This seal is supplied
with the flue component.
To temporarily assemble the flue system components, to check
component lengths, alignment of connections, etc. DO NOT fit the lip
seals. However, for FINAL assembly the lip seals provided MUST be
fitted at EVERY joint.
First fit the lip seal supplied into the groove (in the inner flue liner) at
the ‘male collar’ end of the flue component. Refer to Figure 7-5. The
lip seal should be fitted ‘dry’, i.e. with no lubricating grease applied at
this stage. The lubricating grease (also supplied with the component)
should be applied to the seal after it is fitted but before fitting the two
flue components together.
Loosen the locking band at the ‘female collar’ end. Insert the ‘male
collar’ into the ‘female collar’ and twist through 1/6 of a turn to lock in
place. Refer to Figure 7-6.
Ensure that the two beaded ends of the flue components are in
contact with each other all round. Position the locking band and so
that it grips the beaded edge of both components and fasten using
the spring clip. The locking bands provided MUST be fitted at ALL flue
joints. Refer to Figure 7-7.
To allow for alignment, the female collars of the elbows do NOT have
the twist lock flutes, but the locking band MUST still be used to secure
the two flue components together.
Locking
band
Figure 7-7:
Fitting of locking band
