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8 Electrical
The VORTEX Eco External module
requires a 230/240 V ~ 50 Hz supply. It
must be protected by a 5 Amp fuse.
Refer to Figures 8-1 to 8-4 for typical
control system wiring diagrams.
Refer to Figure 8-3 for boiler internal
wiring diagram.
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 should be used for the
connection.
The power supply cable should be at
least 0.75 mm² 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 IET
Wiring Regulations.
Any room thermostat or frost thermostat
used must be suitable for use on mains
voltage.
The boiler requires a permanent mains
supply, do not interrupt it with any
external time controls.
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
8.1 Connecting the Power
Supply
It is recommend that the boiler should
be connected to a switched mains
power supply from a programmer
or control system. If a Grant remote
programmer is used, a permanent 240
V mains supply (fused at 5 Amp) must
be taken to the boiler. A three core
cable is required to connect the boiler
terminal block to the live supply. Refer
to Figures 8-1 to 8-2 for typical control
system wiring diagrams.
The procedure is:
1. Undo the three screws and remove
the lefthand cover from the control
panel to gain access to the boiler
terminal block.
2. Pass the mains power supply
cable through the cable grommet
in the control panel, through the
cable clamp and connect to the
terminal block as follows:
Brown to live (terminal 2)
Blue to mains neutral (terminal 3)
Green/Yellow to mains earth
(terminal 4)
3. Refer to Figures 8-1 to 8-2 for
a typical control system wiring
diagrams.
4. If the circulating pump is to be
fitted within the boiler enclosure,
the pump live must be connected
to terminal 7 of the boiler terminal
block.
Pass the pump power supply
cable through the cable grommet
in the control panel, through the
cable clamp and connect to the
terminal block as follows:-
Brown to live (terminal 7)
Blue to mains neutral (terminal 9)
Green/Yellow to earth (terminal 10)
Connecting the pump in this way
allows it to be isolated using the
isolating switch fitted in the boiler
control panel, for servicing or
maintenance work.
5. Ensure that the cable clamp is
tightened and that all cables are
secure and all external wiring is
adequately supported.
6. Replace the cover on the control
panel, with the yellow warning label
facing outwards and secure with
the three screws.
Do not switch on the electricity supply
to the External module at this stage.
8.2 Frost Protection
External Modules are supplied with a
factory fitted frost protection thermostat,
located inside the boiler control panel
This is pre-wired to the boiler electrical
system and factory set to 2°C.
For total system protection against
freezing, particularly during extended
periods without electrical power, Grant
recommend the use of a combined
heating system antifreeze and corrosion
inhibitor, used in accordance with the
manufacturer’s instructions.
!
WARNING
The VORTEX Eco boiler contains
electrical switching equipment and
must be earthed.
!
NOTE
A test switch is fitted to the control
panel (see Figure 1-1) to allow the
boiler to be test-fired. When On,
the switch by-passes the external
control system.
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