15
NOTE
When cutting an extension to the required length, you must
ensure that the excess is cut from the plain end of the exten-
sion. Remove any burrs, and check that any seals are located
properly.
You must ensure that the entire flue system is properly sup-
ported and connected.
4.6 CONNECTING THE GAS AND WATER
The appliance is supplied with an accessory pack that includes
service valves.
The service valves are for welding. The accessory pack contains
sealing washers’ etc, for use with the service valves.
NOTE
It will be necessary to hold the valve with one spanner whilst
tightening with another
Fig. 16
Hot water
outlet
Cold water inlet
stopcock/filling
valve
Gas
cock
C/H flow
valve
C/H return
valve
Safety
valve outlet
4.6.1 GAS (fig. 16)
The appliance is supplied with a 22mm service valve, connect
a 22mm 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 (fig. 16)
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 in-
crease the size of the flow & return pipe work after the service
valve connections.
4.6.3 COLD WATER INLET (fig. 16)
The appliance is supplied with a 15mm combined stopcock,
connect a 15mm pipe to the inlet of the stopcock and tighten
both nuts.
4.6.4 HOT WATER OUTLET (fig. 16)
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 (fig. 16)
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.
4.6.6 CONDENSE PIPE
During normal operation the boiler produces condense which
is collected in a trap located in the lower part of the boiler. A
flexible pipe (condense outlet pipe) is connected to the outlet
of the trap. The flexible 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
Connect the flexible condense outlet pipe supplied in the carton
to the condense trap inside the boiler, care should be taken to
ensure that the trap connections are not disturbed.
Connect a suitable plastic (not copper) pipe (no less than 20mm
diameter) to the outlet pipe and ensure it discharges in accord-
ance with building regulations or other rules in force.
4.7 ELECTRICAL CONNECTIONS
The boiler is supplied with a 2-metre 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 4.7.3 for details on
how to connect the electrical supply directly to the boiler.
The electrical supply must be as specified in section 3/3A.
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
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 flexible 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 (fig. 17)
To gain internal access to the appliance you must first 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-fit in
the reverse order
• gently lower the control fascia until it rests.
4.7.2 APPLIANCE TERMINAL BLOCK
The appliance terminal block is located on the rear of the con-
trol fascia. Remove the casing as described in 4.7.1. Gently
pull the control panel forwards and down. Locate the terminal
block cover (fig. 18).
NOTE
The appliance comes with a factory fitted connector plug to
allow
Quick and easy connection to the Vokera time clock. If it is an-
ticipated 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 fitted (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-fitted 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.
