18
4.6 CONNECTING THE GAS AND WATER
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
fi
rst then insert the sealing wash-
ers before tightening the valve to the appliance.
NOTE
It will be necessary to hold the valve with one spanner whilst
tightening with another.
4.6.1 GAS (
fi
g. 26)
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.
4.6.2 FLOW & RETURN (
fi
g. 26)
The appliance is supplied with 22mm service valves for the
fl
ow 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 in-
crease the size of the
fl
ow & return pipe work after the service
valve connections.
4.6.3 COLD WATER INLET (
fi
g. 26)
The appliance is supplied with a 15mm combined stopcock
and double check-valve, connect a 15mm pipe to the inlet of
the stopcock and tighten both nuts.
4.6.4 HOT WATER OUTLET (
fi
g. 26)
The appliance is supplied with a 15mm outlet connection, con-
nect a 15mm pipe to the outlet connection and tighten both nuts.
4.6.5 SAFETY VALVE (
fi
g. 26)
Connect the safety valve connection pipe to the safety valve
outlet and tighten. The discharge pipe must have a continuous fall
away from the appliance to outside and allow any water to drain
away thereby eliminating the possibility of freezing.
The discharge pipe must terminate in a position where any water
- possibly boiling - discharges safely without causing damage or
injury, but is still visible.
4.6.6 CONDENSE PIPE
During normal operation the boiler produces condense which
is collected in a trap located in the lower part of the boiler. A
fl
exible pipe (condense outlet pipe) is connected to the outlet
of the trap. The
fl
exible pipe must be connected to a plastic
waste pipe only. The plastic waste pipe must have a minimum
of a 3º fall towards the drain. Any external run of pipe should
be insulated to prevent the risk of freezing.
4.6.7 CONNECTING THE CONDENSATE OUTLET
Gently pull the condense outlet pipe down from its location
inside the boiler until approximately 100mm protrudes from the
underside of the boiler, care should be taken to ensure that the
pipe connection to the trap remains secure. Connect a suitable
plastic (not copper) pipe (no less than 21mm diameter) to the
outlet pipe and ensure it discharges in accordance with local
building regulations or other rules in force.
4.7 ELECTRICAL CONNECTIONS
The boiler is supplied with a 2-metre
fl
y-lead. This lead can
be used for connection to the electrical supply. Connect the
fl
y-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
fl
y-lead be unsuitable, refer to 4.7.3 for details on
how to connect the electrical supply directly to the boiler.
The electrical supply must be as speci
fi
ed in section 3/3A.
A quali
fi
ed 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
detailed instructions. ANY EXTERNAL CONTROL OR WIRING
MUST BE SERVED FROM THE SAME ISOLATOR AS THAT
OF THE APPLIANCE. The supply cable from the isolator to the
appliance must be 3-core
fl
exible sized 0.75mm to BS 6500 or
equivalent. Wiring to the appliance must be rated for operation
in contact with surfaces up to 90 ºC.
Fig. 26
4.7.1 CASING REMOVAL (
fi
g. 27)
To gain internal access to the appliance you must
fi
rst remove
the casing, proceed as outlined below:
• locate and unscrew the 3-screws (A) that secure the outer
casing to the appliance lift the casing upward to disengage
it from the top locating hooks and then remove
• store the casing and screws safely until required. Re
fi
t in
the reverse order.
4.7.2 APPLIANCE TERMINAL BLOCK
The appliance terminal block is located on the rear of the control
fascia. Remove the casing as described in 4.7.1. Gently pull
the control panel forwards and down. Locate the terminal block
cover (
fi
g. 28).
NOTE
The appliance comes with a factory
fi
tted link (‘TA’) to allow
basic operation of the boiler via the mode selector switch. If
it is anticipated that external controls will be required please
refer to the wiring diagrams in section 8 for more detailed
information.
4.7.3 CONNECTING THE MAINS (230V) INPUT
Unhook and remove the terminal block cover (230V). Pass the
cable through the cable anchorage point. Connect the supply
cable wires (LIVE, NEUTRAL, & EARTH) to their corresponding
terminals (L, N, & E) on the appliance – high voltage – terminal
block. When connecting the EARTH wire, ensure that it’s left
slightly longer that the others, this will prevent strain on the
EARTH wire should the cable become taut. Do not remove the
link wire unless additional external controls are to be
fi
tted (see
section 8). The securing screw on the cable anchorage should
now be tightened. This must be done before the terminal block
cover is re-
fi
tted in its position.
NOTE
It is the installer’s responsibility to ensure that the appliance is
properly Earthed. Vokèra Ltd. cannot be held responsible for any
damages or injuries caused as a result of incorrect Earth wiring.
Fig. 27
A
Fig. 28
Hot water outlet
Cold water inlet
stopcock
Gas
cock
C/H
fl
ow
valve
C/H return
valve
Safety valve outlet