17
4.6 CONNECTING THE GAS AND WATER
The appliance is supplied with an accessory pack that includes
service valves, sealing washers’ etc, for use with the service
valves.
4.6.1 GAS (
fi
g. 22)
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. 22)
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 SAFETY VALVE (
fi
g. 22)
Connect the safety valve connection pipe to the safety valve
outlet. Connect a discharge pipe to the other end of the safety
valve connection pipe 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 possibil-
ity 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.
4.6.4 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.
4.6.5 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.
Fig. 22
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 specifi ed in section 3/3A. A
qualifi 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 instruc-
tions. 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.
4.7.1 CASING REMOVAL (
fi
g. 23)
To gain internal access to the appliance you must fi rst remove
the casing, proceed as outlined below:
• locate and unscrew the 2-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
• remove the retaining screw below the control fascia and
gently lower it until it rests.
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. 24).
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.
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. 23
A
Fig. 24
Gas
cock
C/H fl ow
valve
C/H return
valve
Safety valve outlet
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