Grant Spira Series - Flue System Assembly

Flue System and
Air Supply
25
7.3 Flue System Assembly
7.3.1 Fan Box & Flue Starter
The fan box supplied with the boiler
(packed in the accessories carton)
incorporates:
• Flue exhaust fan
• Draught stabiliser
• Flue starter connection (to fit Grant
‘Black’ flue system)
• Clean out hatch
The fan box is supplied with a neoprene
gasket for connection to the boiler. This
neoprene gasket is to accommodate
the low temperature wet flue system of
the Grant SPIRA boilers. Refer to
Section 4.15 for fitting details.
The lead for the flue fan (supplied
factory-fitted to the fan box) is
connected to the same 5-way plug as
the lead for the wash system solenoid
valve. Refer to Section 4.15 for
connection details.
When fitting the flue system to the flue
starter connection, on the fan box, the
lip seal supplied with the flue
component must be fitted to the inner
flue liner, and the locking band fitted to
secure the joint.
When installed, the draught stabiliser
must not be boxed in or obstructed
from operation in any way.
The clean out hatch allows access to
the inside of the fan box for inspection
and, where necessary, removal of any
ash that may have dropped down
inside the flue system. The clean-out
hatch MUST be correctly fitted during
normal boiler operation. See Section 10
-Servicing.
A condensate drain at the base of the
flue is not required as the flue system is
designed to allow the condensate to
run back into the boiler.
7.3.2 Flue System
The Grant ‘Black’ flue system is a fully
insulated stainless steel twin-wall flue -
finished with a Black Polyester Powder
paint finish. This insulated flue system
reduces the possibility of the
condensate freezing in the flue, and
also has a high corrosion resistance
suitable for solid fuel.
The 125mm (5in) ‘Black’ twin-wall flue
system is suitable for BOTH the SPIRA
6-26 & 9-36 models.
Masonry chimneys MUST be lined
using the 125mm stainless steel flexible
‘smoothbore’ liner – available as part of
the ‘Black’ system - due to the
condensate produced from the boiler.
6.3.3 Joining Components
All the ‘Black’ 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.
To join two components together:
First fit the lip seal supplied into the
groove (in the inner flue liner) at the
‘female collar’ end of the flue
component to be fitted.
All flue joints must have a lip seal
gasket fitted. The lip seal should be
fitted dry and the lubricating grease
(supplied with the component) applied
to the internal surface of the socket into
which it is to be fitted.
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 7-3.
!
NOTE
The Grant BLACK flue system is the
ONLY flue system suitable for use
with the Grant SPIRA Wood pellet
boilers. The use of other flue
systems will invalidate the product
warranty on the boiler.
Figure 7-2: Male and female flue connections
Male
collar
Insulation
Female
collar
Stainless
steel outer
case
Stainless
steel
inner liner
Capillary
break