
Supplied By www.heating spares.co Tel. 0161 620 6677
6
221100C
SENSING
TUBE
FITTING
ASSEMBLY
THREAD CUTTING
SCREW(Taptite)
3 mm
BACK
BOILER
SENSING TUBE
BULKHEAD CONNECTION
TUBING
NUT
BOILER AIR DUCT
SENSING
TUBE
FITTING
ASSEMBLY
FRONT FACE
OF BOILER
CASTING
FILTER
3 F i r e F r o n t P r e p a r a t i o n
2452
Diagram 3.3
SECURING
SCREW
FLUE
SPIGOT
Diagram 3.4
* 'C'
* 'C'
'P'
45
56
1558
*'C' = Distance from fire fixing wall face to
datums on back boiler air duct. This represents
the length of pipe that requires cutting off.
BACK
BOILER
AIR
DUCT
GAS FIRE
SUPPLY TUBE
FIRE FIXING
WALL FACE
3.2 Flue Spigot Assembly
Note. This is marked “Homeglow BBU”.
Leave the fire front sitting in the base tray.
Secure the spigot assembly to the fire front back with the
self tapping screws provided, from the loose items pack,
see diagram 3.3.
Note, there are eight self tapping screws in the pack, two
are spare.
3.3 Gas Supply to Fire Front
Check that gas service cock is in the Off position,
see diagram 6.3.
The inlet supply tube is packed with the fire front plinth.
This supply tube may need to be cut, at the plain end,
dependent on the model and position of the back boiler
in the opening.
Measure the distance “C”, see diagram 3.4, from the
front mark “P” on the air duct to the fire front fixing wall
face.
Use a straight edge across the opening.
Shorten the plain end of the gas supply tube by distance
“C”. No shortening is required when mark “P” is level
with the fire fixing wall face, “C” being zero.
The maximum distance for “C” will be 67mm.
Deburr the tube end inside and out.
3.4 Back Boiler Sensing Tube Fixing
Removed plastic ferrule from bulkhead connector.
Fix the flared end of the back boiler sensing tube to the
bulkhead connection on the boiler air duct with the
tubing nut provided. Slide the sensing tube mounting
bracket assembly over the back boiler sensing tube and
fix to the casting with the screw provided,
see diagram 3.5. Fit the sensing tube fitting onto the
fitting assembly, see diagram 3.5. Take care not to
damage the filter.
Important. Make sure that the mounting bracket
assembly is pushed back to the front face of the boiler
casting, and check 3mm. distance is achieved and the
back boiler sensing tube does not extend above sensing
tube fitting, see diagram 3.5.
Note. After fitting the combustion products discharge
safety device sensing tube please refer to the
'commisioning' section of the back boiler unit and relight
the boiler to test the device.
Diagram 3.5
6138