Technical data

8.1 EXTERNAL WIRING

The appliance comes with a factory fitted link to allow basic opera-

tion 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

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. 45.

The Vokera room thermostat can be used as detailed in fig. 45.

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).

Fig. 45

Contact the controls manufacturer and/or Vokera techni-

cal department should you require more specific informa-

tion on the suitability of a particular control. Further guid-

ance on the recommended practice for the installation of

external controls, can be found in CHeSS – HC5/HC6

(www.energy-efficiency.gov.uk).

Fig. 43

Fig. 44

Fig. 46

ME2

ME10

F= Fuse 3,15AF

SECTION 8 - WIRING DIAGRAMS