16
4.6.5 SAFETY VALVE (fig. 19)
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 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.
4.7 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 appli-
ance 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
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
•
remove retaining screw from under the control fascia and
lower gently 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 (fig. 21).
NOTE
If the appliance is to be used without the use of external controls,
a link must be fitted across the (‘CN5’) terminal on the PCB 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 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.
Fig. 20
A
Fig. 21
C/H return
valve
C/H flow
valve
Safety valve outlet
Gas
cock
Hot water
outlet
Cold water inlet
stopcock/filling
valve
Fig. 19
