45
9 WIRING DIAGRAMS
NOTE
Please refer to 3 - 3E and use the appropriate PPE when
carrying out any of the actions or procedures contained within
this section.
9.1 EXTERNAL WIRING
The appliance comes with a factory fitted (TA) link to allow
basic operation of the boiler via the mode selector switch. If
external controls are to be added to the system, they must be
connected to the appliance as shown in the following diagrams.
For advice on controls that are not featured in this book, please
contact Vokèra technical on 0844 391 0999.
9.1.1 EXTERNAL WIRING LIMITATIONS
Low voltage and High voltage cables must be run separately.
Any external wiring must remain within the limits as detailed:
room thermostat = 30-metres
9.1.2 OUTSIDE SENSOR
The outside sensor can be connected via a controls interface
which enables a connection to be made directly on the PCB at
plug CN6 (see Fig. 48).
9.2 OTHER DEVICES
Contact the controls manufacturer and/or Vokèra technical
department should you require more specific information on the
suitability of a particular control. Further guidance on the recom-
mended practice for the installation of external controls, can be
found in CHeSS – HC5/HC6 (www.energyefficiency.gov.uk).
IMPORTANT
• The boiler must always be supplied with a permanent 230V
electrical supply.
• The room thermostat connection is low voltage (24 Vdc).
• Do not connect any controls or auxiliary equipment to the
low-voltage terminal strip, other than that approved/supplied
by Vokèra Ltd.
9.3 OTBUS CONNECTION
When an OTBus remote control is connected to the system,
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 OTBus remote control)
it is no longer possible to set the domestic hot water
setpoint (it is set by the OTBus remote control)
the combination of the
A+B
keys remains active for the
setting of the DOMESTIC HOT WATER COMFORT
function
the domestic hot water setpoint 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 OTBus remote
control does not have a request if the parameter:
P3.11 = 1
or
P3.11 = 0 and the jumper on 1-2pin of X 21 is closed
to activate the COMBUSTION CHECK function with an
OTBus remote control connected, you must temporarily
disable the connection by setting the parameter P8.03 = 0.
Remember to reset this parameter once the function has
finished
.
We can see that it is not possible, with the OTBus remote
control connected, to change the values of the parameter
P4.12 and P4.23 from 0 to 1.
-t°
E.S.
CN6
CN5
Fig. 47
Fig. 48
