30
Fig. 16
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.
5.6 CONNECTING THE GAS & WATER (fig. 17)
The appliance is supplied with an accessory pack that includes
service valves. The service valves are of the compression type.
The accessory pack contains sealing washers’ etc, for use with
the service valves. When connecting pipe work to the valves,
tighten the compression end first then insert the sealing washers
before tightening the valve to the appliance.
NOTE:
it will be necessary to hold the valve with one spanner
whilst tightening with another.
Fig. 17
Hot water
outlet
Cold water
inlet
stopcock
C/H return valve
C/H flow
valve
Gas
cock
Filling loop
5.6.1 GAS
The appliance is supplied with a 15mm service valve, connect a
15mm pipe to the inlet of the valve and tighten both nuts.
NOTE:
it will be necessary to calculate the diameter of the gas
supply pipe to ensure the appliance has an adequate supply of gas.
5.6.2 FLOW & RETURN
The appliance is supplied with 22mm service valves for the
flow and return connections, connect a 22mm pipe to the inlet
of each valve and tighten both nuts.
NOTE:
depending on system requirements, it may necessary
to increase the size of the flow & return pipe work after the
service valve connections.
5.6.3 COLD WATER INLET
The appliance is supplied with a 15mm combined stopcock and
filling valve, connect a 15mm pipe to the inlet of the stopcock
and tighten both nuts.
5.6.4 HOT WATER OUTLET
The appliance is supplied with a 15mm outlet connection, connect
a 15mm pipe to the outlet connection and tighten both nuts.
5.6.5 SAFETY VALVE (fig. 18)
The appliance incorporates a combined safety discharge
and condensate discharge arrangement. Consequently the
combined discharge pipe must have a continuous fall away
from the appliance and should be suitably protected against
the risk of freezing.
Alternatively it is permissible to fit a tundish, e.g. Mactun, Hotun,
etc. close to or adjacent to the discharge pipe where it exits
the appliance.
Fig. 18
5.6.6 COMBINED PRV & CONDENSATE
DISCHARGE PIPE
This appliance will - under normal operating conditions -
produce condensate fluid that will require to be disposed of via
the dwelling’s waste water drainage system. Vokera strongly
recommends that the condensate pipe is connected to the
internal waste water pipework in accordance with BS6798.
BS6798 provides comprehensive instruction and advice on all
permissible condensate disposal methods; notwithstanding this,
it is essential that the following is strictly adhered to:
- use only plastic drainage pipe (minimum OD of 21.5mm)
- horizontal runs must incorporate a minimum 45mm fall per
metre, away from the appliance
- external pipework and/or pipework in unheated areas, must
have a minimum OD of 32mm and be insulated with Class-O
pipe insulation
- the route, type, and termination of the condensate disposal
method, must not permit any spillage of condensate fluid,
into the dwelling in the event of a blockage or freezing of the
condesate pipework
- if there is a risk of freezing, Vokera strongly recommends that
a tundish is incorporated within the discharge pipework (see
section 5.6.5 above).
Should it not be possible to route and terminate the condensate
pipework internally using ‘gravity discharge’; Vokera
recommends that the Vokera condensate pump (code 404) be
considered as an alternative solution.
Ensure that the end-user is aware of the effect/consequences
of the condensate pipework becoming blocked or frozen.
5.7 ELECTRICAL CONNECTIONS
The boiler is supplied with a fly-lead. This lead can be used for
connection to the electrical supply. Connect the fly-lead to a
fused plug or fused isolator in the following way:
• brown wire to LIVE supply
• blue wire to NEUTRAL supply
• green/yellow to EARTH connection.
Insert the supplied 3-AMP fuse into the fused isolator or fused
plug. Should the fly-lead be unsuitable, refer to section 5.7.3
for details on how to connect the electrical supply directly to
the boiler.
The electrical supply must be as specified in section 4/
4A.
A qualified electrician should connect the appliance to the
electrical supply. If controls - external to the appliance - are
required, a competent person must undertake the design of
any external electrical circuits, please refer to section 8 for
