29
8.1 EXTERNAL WIRING
The appliance is supplied with a ‘plug & play’ connector that
enables a quick and easy connection to various Vokèra con-
trols (see Fig. 49 & 50). For advice on controls that are not
featured in this booklet, please contact the Vokèra technical
help-line.
8.1.1 EXTERNAL WIRING LIMITATIONS
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 (fig. 49)
• single-channel, voltage-free time room thermostats
(fig. 50)
• programmable RF room thermostats (fig. 49)
• low voltage (24Vdc) room thermostat (CN5 fig. 49).
8.3 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).
8.4 VOKÈRA LOWER COVER MECHANICAL
CLOCK (fig. 4)
The Vokèra lower cover mechanical clock kit (product code
20025081) is entirely suitable for the Compact A 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 the factory fitted connector
plug and connect to the corresponding plug supplied with the
mechanical clock wiring harness.
To add a room thermostat, identify the 2 switch wires (black/red
colour in terminal block (CN5) and connect the room thermostat
wires in series in terminal block CN5 (see fig. 50)
Refit the boiler casing.
Fit the cover kit to the boiler.
IMPORTANT
•
The boiler must always be supplied with a permanent 230V
electrical supply.
•
Always remove the link between TA & TA on the CN5 PCB
terminal (see fig. 49).
•
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.
N L
Fuse 3.15A F
230 V
M3
F
blue
brown
CN5
MMM
2
1
4
red
black
4
1
2
3
AMP
4
1
2
3
AMP
4
3
2
1
AMP
4
3
2
1
AMP
red
black
blue brown
Fermale connector
Male connector
Fig. 49
MMM
2
1
4
4
1
2
3
AMP
1
2
3
AMP
4
3
2
1
AMP
4
3
2
1
AMP
red
black
blue brown
Male
connector
Fermale
connector
black
red
CN5
N L
230 V
F
blue
brown
Fuse 3.15A F
M3
G
Room Thermostat
(Voltage free contact input)
G = cable connector
Fig. 50
SECTION 8 - WIRING DIAGRAMS
MECHANICAL CLOCK -
RADIO FREQUENCY RECEIVER
