VOKERA Mynute EHE Installation & Servicing Instructions Manual - page 13
11
mounted securely. Once the bracket has been secured to
the wall, mount the appliance onto the bracket.
IMPORTANT
The vertical flue terminal is 1.0 metre in length and cannot
be cut; therefore it may be necessary to adjust the height
of the appliance to suit or use a suitable extension.
Connect the vertical flue assembly to the boiler flue spigot
using the 100mm clip, gasket & screws (supplied), ensur-
ing the correct seal is made. The flue support bracket
(supplied with the vertical flue kit) can now be fitted.
If the vertical flue requires extension/s or additional bend/
s, connect the required number of flue extensions or bends
(up to the maximum equivalent flue length) between the
boiler and vertical flue assembly (see fig. 8).
Ensure that any
horizontal sections of the flue system have a minimum 1º;
maximum 3º fall back to the boiler (1º = 17mm per 1000mm).
NOTE
When cutting an extension to the required length, you
must ensure that the excess is cut from the plain end of the
extension (see fig. 8). Remove any burrs, and check that
any seals are located properly.
You must ensure that the entire flue system is properly
supported and connected.
4.5.3
TWIN FLUE SYSTEM
The Vokera twin flue system enables greater flue distances
to be achieved (see 4.4.2) than that of a concentric flue
system. It can be used for horizontal or vertical applica-
tions, however the twin flue system must be converted to the
dedicated concentric flue kit for termination. It is essential
that the installation of the twin flue system be carried out in
strict accordance with these instructions.
FLUE RESTRICTOR RING (parallel or twin flue)
To ensure maximum efficiency of the appliance, it may be
necessary to fit one of the supplied flue restrictor rings to the
appliance flue outlet (see tables below).
GUIDANCE NOTES ON TWIN FLUE INSTALLATION
●
The flue must have a have a minimum 1º; maximum 3º
(1º = 17mm per 1000mm) fall back to the appliance to
allow any condensate that may form in the flue system to
drain via the condensate drain. Consideration must also
be given to the fact that there is the possibility of a small
amount of condensate dripping from the terminal.
●
Ensure that the entire flue system is adequately sup-
ported, use at least one bracket for each extension.
●
The entire flue system must be adequately insulated to
maintain heat within the flue system thereby reducing the
possibility of condensate production.
●
As the exhaust outlet pipe can reach very high tempera-
tures it must be protected to prevent persons touching the
hot surface.
●
The condensate drain pipe must be connected in ac-
cordance with building regulations.
MOUNTING THE BOILER
The fixing holes for the wall-mounting bracket should now
be drilled and plugged, an appropriate type and quantity
of fixing should be used to ensure that the bracket is
mounted securely. Once the bracket has been secured to
the wall, mount the appliance onto the bracket.
Part No.
Description
Length
0225805
Horizontal flue terminal
1.0 metre
0225810
Vertical flue terminal
1.0 metre
430
Twin adapter kit
N/A
0225770
Pitched roof flashing plate
N/A
0225765
Flat roof flashing plate
N/A
0225815
Condensate drain kit
N/A
0225820
0.25m extension (pair)
250mm
0225825
0.5m extension (pair)
500mm
0225830
1.0m extension (pair)
1000mm
0225835
2.0m extension (pair)
2000mm
0225840
45º bend (pair)
N/A
0225845
90º bend (pair)
N/A
0225850
Twin bracket (5)
N/A
0225855
Single bracket (5)
N/A
Twin flue ccessories
B
C
A
Fig. 10
Fig. 11
4.5.3.1 INSTALLATION OF TWIN ADAPTOR KIT (fig. 10 & 11)
●
Insert the exhaust connection manifold (
A
) onto the
appliance flue outlet.
●
Remove the blanking plate (located to the right of the
appliance flue outlet) and – using the same screws –
install the air inlet plate (
B
).
●
Using the hole in the exhaust connection manifold as a
guide, drill a 3mm hole in the appliance flue spigot and
secure the exhaust manifold connection to the flue spigot
using the screw provided (
C
).
●
Using the two holes in the air inlet plate as a guide, drill
a 3mm hole in each and secure the air inlet pipe/bend
using the screws provided.
The twin flue pipes extensions and accessories can now be
installed by pushing together (the plain end of each extension
or bend should be pushed approximately 50mm into the female
socket of the previous piece).
4.5.3.2 HORIZONTAL TERMINATION (fig. 12)
The twin flue system must be converted to the dedicated
concentric flue kit for termination.
●
The horizontal terminal is supplied with a built-in con-
verter box and cannot be shortened.
●
A 130mm hole is required for the passage of the concen-
tric terminal through the wall.
●
The air inlet pipe must always be level with or below, that
of the exhaust pipe.
Depending on site conditions it may be preferable to install
the terminal assembly prior to fitting the twin flue pipes.
Mark and drill a level 130mm hole for the passage of the
horizontal flue terminal. Insert the terminal assembly into
the flue hole.
Bend
Reduction in maximum flue length for each bend
45º bend
0.5 metre
90º bend
1.0 metre
Reduction for additional bends
Total flue length
Restrictor required
Less than 7.0 metres
40mm diameter
Less than 13.5 metres 45mm diameter
Less than 19.5 metres not required
Total flue length
Restrictor required
Less than 5.0 metres
45mm diameter
Less than 12.0 metres not required
Total flue length
Restrictor required
Less than 5.0 metres
50mm diameter
Less than 10.0 metres not required
29 EHE
35 EHE
25 EHE