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The construction of the condensation exhaust system downstream
of the appliance is the responsibility of the installer.
The condensation exhaust system must be dimensioned and
installed in such a way as to guarantee the correct evacuation of
the condensation produced by the appliance and/or collected by
the evacuation systems of combustion products.
All the components of the condensation exhaust system must be
made in a workmanlike manner using materials that are suitable
for withstanding the mechanical, thermal and chemical stresses
of the condensation produced by the appliance over time.
Note: if the condensation exhaust system is exposed to the risk
of frost, always provide an adequate level of insulation of the pipe
and consider any increase in the diameter of the pipe itself.
The condensation exhaust pipe must always have an adequate
slope level to prevent the condensation from stagnating and its
proper drainage.
The condensation exhaust system must have an inspectable
disconnection between the condensation exhaust pipe of the
appliance and the condensation exhaust system.
4.5
ELECTRICAL CONNECTIONS
The boiler is supplied w ith a short 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 for details on how
to connect the electrical supply directly to the boiler.
The electrical supply must be as specified in section 3/3E. 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 7 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 seized 0.75mm to BS 6500 or equivalent. Wir-
ing to the appliance must be rated for operation in contact with
surfaces up to 90 ºC.
Low voltage connections
CE4 connector: use 4-poles connector, supplied as stan-
dard, for connections with ModBus 485 signal, see section 7
'WIRING DIAGRAMS' for advice on configuring the 485 BUS
signal.
b
We recommend using conductors with a section no larger than
0,5 mm
2
.
connector (CE4)
- A B +
Connection on the main board: make the TA (ambient
thermostat), OT+ and SE (external sensor) connections on
X11 connector - see section "7 WIRING DIAGRAMS".
NOTE: when an OT+ remote control is connected to the sy-
stem, if parameter 803=1 (SERVICE), the boiler display shows
the following screen:
In particular on the boiler display:
- it is no longer possible to set the
boiler OFF/WINTER/SUMMER
status (it is set by the OT+ re-
mote control)
- it is no longer possible to set the
domestic hot water setpoint (it is
set by the OT+ remote control)
20
4-poles
ModBus
o
t
o
t
- the combination of the A+B keys remains active for the set-
ting of the DOMESTIC HOT WATER COMFORT function
- the domestic hot water setpoint (I005) is displayed in the INFO
menu
- the heating setpoint value calculated by the OT+ remote con-
trol (I017) is displayed in the INFO menu
- the heating setpoint set on the boiler display is used only
if there are heat requests from the TA and the OT+ remote
control does not have a request if the parameter: 311 = 1.
This value is displayed in the INFO menu (I016).
- to activate the "Combustion analysis" function with an OT+
remote control connected, you must temporarily disable the
connection by setting the parameter 803 = 0 (SERVICE);
remember to reset this parameter once the function has fi-
nished.
Key 3 remains active for the visualisation of the INFO menu
and the enabling of the SETTINGS menu.
4.6
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 that secure the outer ca-
sing 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
• press and hold the spring tabs on either side of the control
panel where it meets the appliance side panels and gently
lower it until it rests.
4.7
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 corre-
sponding 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 7) route the electrical supply via the cable entry/
exit point and secure to the sleeve using an appropriate cable
tie, and/or silicone sealant.
The appliance comes with a factory fitted 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 7 for more detailed information.
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.
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