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SECTION 8 - WIRING DIAGRAMS
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 0844
391 0999.
8.2 TYPICAL CONTROL APPLICATIONS
230 V
N
F= Fuse 3,15AF
F = Fusibile 3,15A F
M3
Fig. 42
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 conjunction 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. 44.
The Vokera room thermostat can be used as detailed in fig. 44.
8.4 OTHER DEVICES
Fig. 46 details typical devices that are suitable for this applian-
ce:
- 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).
Contact the controls manufacturer and/or Vokera technical
department should you require more specific 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).
CH
TIME CLOCK
P.O.R.
M
L
M6
F
230 V
F= Fuse 3,15AF
F = Fusibile 3,15A F
M3
Fig. 43
230 V
N
L
F= Fuse 3,15AF
F = Fusibile 3,15A F
M3
F
Fig. 44
T.B.T.
Fig. 45
ROOM
TERMOSTATO
THERMOSTAT
AMBIENTE
L
N
M6
F
CH
TIME CLOCK
P.O.R
M
ROOM
TERMOSTATO
THERMOSTAT
AMBIENTE
M6
S.E.
−t°
P2
ME2
M2
ME10
M10
29
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