Electrical
25
8 Electrical
The Vortex boiler contains electrical
switching equipment and must be
earthed.
The supply must be fused at 5 Amp and
there must only be one common isolator
for the boiler and control system,
providing complete electrical isolation.
A fused double pole switch or a fused
three pin plug and shuttered outlet
socket must be used for the
connection.
The power supply cable should be at
least 0.75mm
2
PVC as specified in
BS 6500, Table 16.
All the wiring and supplementary earth
bonding external to the boiler must be in
accordance with the current I.E.E.
Wiring Regulations.
Any room thermostat or frost thermostat
used with the Vortex boiler must be
suitable for use on mains voltage.
In the event of an electrical fault after
installation of the boiler, the following
electrical system checks must be
carried out:
• Short circuit
• Polarity
• Earth continuity
• Resistance to earth
The Vortex boiler requires a 230/240 V
~ 50 Hz supply. It must be protected by
a 5 Amp fuse.
Figure 8-5 and Figure 8-6 are wiring
diagrams for Non-system and System
models of the VORTEX Wall Hung boiler.
8
.1 Connecting the Power
Supply
It is recommended that the boiler should
be connected to a switched mains
power supply from a programmer or
control system. A three core cable is
required to connect the boiler terminal
block to the live supply. Refer to Figures
8-1 to 8-4 for typical control system
wiring diagrams.
8
.2 Frost Protection
For additional protection of either the
entire heating system, or the boiler and
localised pipework, it is recommended
that a frost thermostat be installed.
Refer to Section 8.3 for connection
d
etails.
To protect the heating system, the frost
thermostat should be sited within the
house in such a place that it can detect
any rise and fall in the ambient air
temperature, i.e. in a room with a
radiator.
Where the frost thermostat is installed
outside the house (to protect a boiler
installed in an external boiler room or
garage) or in an attic, it is recommended
that it be used in conjunction with a
pipe thermostat to avoid unnecessary
and wasteful overheating of the
property. The pipe thermostat should be
located on the boiler return pipe, and
set to operate at 25°C. Refer to Section
8.3 for connection details.
!
WARNING
When wiring in the supply cable to
the boiler, allow sufficient cable
length so that the control panel can
be hooked to the top panel of the
case during the service operation.
The procedure is:
1. Remove the lower and upper front
panels, if they have not already been
removed.
2. Remove the top of the control panel
or the wiring cover (on Kitchen
models)and open the cable clamp.
3. Route the supply cable through the
hole in the rear panel (using the
grommet supplied) up to the control
panel, pass it through the cable
clamp and connect to the boiler
terminal block as follows:
• Brown to live (terminal 1)
• Blue to mains neutral (terminal 2)
• Green/Yellow to mains earth
(terminal 3)
!
NOTE
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