Technical data

6 720 611 445 GB (04.05)
16
Installation
B Remove the plastic caps from the boiler connec-
tions.
Fig. 14
Fixing the appliance
B Fit the washers onto the gas and water connections.
B Lift the boiler onto the wall-mounting frame. The lugs
pass through the rectangular holes in the boiler back
panel.
B Take care not to disturb the washers on the connec-
tions.
Connecting the flue assembly
B Fit flue duct connector onto appliance flue spigot.
B Secure with screws pre-fitted to flue outlet on boiler
unless additional screws are provided with flue sys-
tem.
Fig. 15
B For remaining installation of flue assembly, refer to
the relevant installation instructions.
3.7 Checking the connections
Water connections
B Check that the O-rings or seals are in place before
tightening the connection.
B Turn on the service valves for boiler flow and return.
B Check all seals and unions for leaks.
Open vent systems: It is not necessary to connect a
drain pipe to the pressure relief valve outlet as it is not
operational and should be blanked off.
Gas supply pipe
B Check that the seal is in place before tightening the
connection.
B Turn off gas cock to protect gas valve against dam-
age from excessive pressure.
B Check gas supply pipe.
B Release the pressure on the gas supply pipe.
3.8 Flue Systems
The only flue systems that may be used are those sup-
plied by Worcester Heat Systems.
The flue system must be installed in accordance with
the requirements of BS 5440:1.
Standard 100 mm flue system
The standard concentric flue system provides for a hor-
izontal length of up to 4m (R29) and 3.5m (R40). Full
instructions for fitting this flue are in Subsection 3.8.2
“Installation of the flue”.
Alternative 125 mm diameter flue systems
Installation instructions for the alternative flue
systems are sent with the appropriate flue kit.
Systems are available to give a maximum horizontal
length of 13m (R29) and 10m (R40).
A vertical flue system up to a height of 15 m (12 m R40)
is available.
45° and 90° flue bends can be used with a correspond-
ing reduction in flue length of 2 m for each 90° bend
and 1 m for each 45° bend used.
IMPORTANT: Any horizontal flue system fitted to a
condensing boiler must incline from the appliance at an
angle of 1,6 ˚ (30 mm per metre length) to prevent con-
densate dripping from the flue terminal.
Note, the standard 100mm horizontal flue requires only
a 0.5˚ incline from the boiler as the inner exhaust pipe
is inclined at 2.5˚ inside the outer pipe.
This means that the clearance above the appli-
ance must be increased to match the duct length.
Refer to fig. 1 on page 5.
1.
6 720 611 441-05.1O
2.
Retaining
Screw
Flue Turret to
Boiler Sealing
Gasket
Flue Turret
6 720 611 400-16.1O
Appliance
Flue Socket