32
8.1
EXTERNAL WIRING
The appliance comes with a factory fitted 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 Vokera technical on 0870
333 0520.
8.2
TYPICAL CONTROL APPLICATIONS
The appliance can be used with the following
controls:
●
Vokera room thermostat (part no. 011)
●
Vokera external sensor. (Part no. 2359259)
●
Single-channel, voltage-free time clocks
●
Programmable room thermostats.
In addition, the appliance can be used in conjunc-
tion with a typical ‘S’-Plan system, please contact
Vokera technical for further detailed instruction.
NOTE
This appliance is not suitable for use with ‘Y’-Plan
systems.
8.3
VOKERA ROOM THERMOSTAT
Connect the Vokera room thermostat to the
appliance as detailed in fig. 45.
The Vokera room thermostat can be used as
detailed in fig. 46.
8.4
OTHER DEVICES
Fig. 47 details typical devices that are suitable
for this appliance:
-
TBT
: low temperature thermostat for underflow
heating, a safety device that prevent overheating
-
SE
: outside sensor, a NTC sensor that
automatically calculates the flow temperature
according to the outside temperature
-
P2
: external pump, a supplementary pump that
can be managed directly from the boiler in order
to satisfy larger systems with high flow rate or
high pressure drop (i.e. underfloor heating).
SECTION 8
WIRING DIAGRAMS
Fig. 46
Contact the controls manufacturer and/or Vokera
technical department should you require more spe-
cific information on the suitability of a particular
control. Further guidance on the recommended
practice for the installation of external controls,
can be found in CHeSS – HC5/HC6 (www.energy-
efficiency.gov.uk).
Fig. 44
Fig. 45
Fig. 47
ME2
ME10
