VOKERA Excel 29 User Manual

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8.1 EXTERNAL WIRING
The appliance comes supplied with a time clock to allow 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 Vokèra technical on 0844 391 0999.
8.1.1 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
8.2 TYPICAL CONTROL APPLICATIONS
The appliance can be used with the following controls:
• single-channel, voltage-free time clocks (g. 39)
• programmable RF room thermostats (g. 39)
• low voltage (24Vdc) room thermostat (CN5 g. 40)
8.3 OTHER DEVICES
Contact the controls manufacturer and/or Vokèra technical
department should you require more specic 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.energyefciency.gov.uk).
8.4 VOKÈRA LOWER COVER MECHANICAL
CLOCK (g. 3)
The Vokèra lower cover mechanical clock kit (product code
20025081) is entirely suitable for the Excel range and eliminates
the need for an external time control.
The kit is comprised of the following:
• lower cover
• mechanical clock
• wiring harness
• instructions
Isolate the appliance from the electrical supply, remove the
boiler casing (see 4.7.1) and locate factory tted connector
plug and connect to the corresponding plug supplied with the
mechanical clock wiring harness.
Ret the boiler casing.
Fit the cover kit to the boiler.
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.
Fig. 39
Fig. 40
SECTION 8 - WIRING DIAGRAMS

VOKERA Excel 29 Specifications

General

ERP Rating	A
Boiler Type	Combination
Output (kW)	29 kW
Mounting	Wall Mounted
DHW Output (kW)	29 kW
Operating Pressure	0.5 - 3 bar