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3A.7 ELECTRICAL SUPPLY
The appliance is supplied for operation on 230V @
50Hz electrical supply; it must be protected with a
3-amp fuse. The method of connection to the mains
electricity supply must allow for complete isolation
from the supply. The preferred method is by using a
double-pole switch with a contact separation of at
least 3mm. The switch must only supply the appliance
and its corresponding controls, i.e. time clock, room
thermostat, etc.
3A.8 MOUNTING ON A COMBUSTIBLE SURFACE
If the appliance is to be fitted on a wall of combustible
material, a sheet of fireproof material must protect
the wall.
3A.9 TIMBER FRAMED BUILDINGS
If the appliance is to be fitted in a timber framed build-
ing, it should be fitted in accordance with I.S. 813 and
local Building Regulations.
The Institute of Gas Engineers publication (IGE/UP/7)
'Guide for Gas Installations in Timber Frame Buildings'
gives specific advice on this type of installation.
3A.10 INHIBITORS
Vokera recommend that an inhibitor - suitable for use
with aluminium heat exchangers - is used to protect
the boiler and system from the effects of corrosion
and/or electrolytic action. The inhibitor must be ad-
ministered in strict accordance with the manufacturers
instructions*.
*Water treatment of the complete heating system -
including the boiler - should be carried out in accord-
ance with I.S. 813 and the Domestic Water Treatment
Association's (DWTA) code of practice.
3A.11 APPLIANCE PIPEWORK CONFIGURATION
(fig. 5)
The appliance 'flow' and 'return' connections can be
configured to suit the following:
1. Top outlet connection
2. Bottom outlet connection
3. Top (flow), bottom (return) connection
4. Top (return) bottom (flow) connection.
Fig. 5
10
3A.11.1 FEED AND VENT PIPEWORK
The feed and vent pipe work from the boiler to the
F&E (Feed & Expansion) tank should be configured
as shown in figure 4A using a 22mm combined feed
and vent pipe.
NOTE
The combined feed and vent pipe must rise continu-
●
ously and be unrestricted.
The diameter of the combined feed and vent pipe
●
shall be 22mm.
The minimum distance from the top of the boiler
●
to the bottom of the F&E tank shall be no less than
1-metre, whilst the maximum distance shall be no
greater than 30-metres.
The supply of water to the F&E tank should be taken
from the mains water supply via a suitable float oper-
ated valve, whilst the supply from the F&E tank to the
boiler/heating circuit (via the combined feed and vent
pipe) shall be unrestricted.
3A.11.2 ALTERNATIVE CLOSE-COUPLED
ARRANGEMENT
If necessary or if preferred, a close-coupled arrange-
ment for the feed and expansion pipe work can be
used as an alternative to a combined feed and vent
pipe. The configuration of the close-coupled pipe work
shall be as shown in figure 4B.
NOTE
The distance between the cold feed pipe and the
●
safety vent pipe shall be no more than 150mm
The cold feed pipe must be inverted as shown in fig.
●
4B
The safety vent pipe must be 22mm in diameter
●
The cold feed pipe must be 15mm diameter
●
The cold feed pipe and safety vent pipe must both
●
rise continuously and be unrestricted.
The minimum distance from the top of the boiler
●
to the bottom of the F&E tank shall be no less than
1-metre, whilst the maximum distance shall be no
greater than 30-metres.
The distance between the bottom of the F&E tank
●
and the highest point of the safety vent pipe must
be no less than 500mm.
The supply of water to the F&E tank should be taken
from the mains water supply via a suitable float oper-
ated valve, whilst the supply from the F&E tank to the
boiler/heating circuit (via the cold feed pipe) shall be
unrestricted.
3A.11.3 REMOTE CONNECTION
It's permissible to connect the feed and vent pipe work
remote from the appliance, providing it's connected
to the primary heating pipe work as shown in figures
4C/4D.
NOTE
The instructions for a combined feed and vent installa-
tion (3A.11.1) or close-coupled arrangement (3A.11.2)
still apply when connecting the feed and vent pipe
work remote from the appliance.
3A.12 DECLARATION OF CONFORMITY
A Declaration of Conformity (as defined in I.S. 813)
must be provided on completion of the installation
A copy of the declaration must be given to the respon-
sible person and also to the gas supplier if required.
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