SP-MAN-INSTALL-01
Revision 2 21-12-21
24
11.0 General
The EOGB Sapphire boiler requires a 230/240 V ~ 50 Hz supply.
It must be protected by a 3 Amp fuse.
The EOGB Sapphire boiler contains electrical switching equipment and must be earthed.
The supply must be fused at 3 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.
All the wiring and supplementary earth bonding external to the boiler must be in accordance with the current I.E.E. Wiring Regulations.
As the boiler/burner uses OpenTherm controls, no additional room thermostat or timers are required.
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
11.1
Connecting the Power Supply
It is recommended that the boiler should be connected to a switched mains power supply from an OpenTherm control system.
Ensure that the route and length of the supply cable is such that the boiler door can be easily removed without disconnecting the supply
cable from the EOGB Sapphire Wiring Centre.
The procedure is:
1.
Remove the boiler door, if it has not already been removed.
2.
Route the supply 3 core cable through the access hole in the rear or side panel on where to place the mains incoming supply
cable.
3.
Connect the 3 core mains supply cable to the EOGB Sapphire wiring centre that is located under the top cover of the boiler
casing.
4.
Wire as per Fig 40
5
Ensure that all external wiring is adequately supported
Do not switch on the electricity supply at this stage.
11.2
OpenTherm Controls
OpenTherm is the name given to a form of communication of information between modulating (condensing) central heating applianc-
es and room thermostats. It sets the rules as to how the appliance and room thermostat communicate with each other.
Modulating control is a method of control used by modern heating systems in the UK. Instead of switching a boiler on and off at intervals,
modulating control allows the amount of heat provided by the boiler to be controlled to match the varying demand signal.
EOGB have recognised the energy savings potential of modulating control and have designed the first modulating oil burner of its type to
work with OpenTherm controls.
How does OpenTherm work?
The standard way to control a heating system is to switch the boiler on and off at intervals with On/Off controls. OpenTherm provides
more precise control on the boiler through the control of the EOGB Sapphire modulating blue flame burner. It allows the amount of heat
provided by the burner to be controlled to match the varying demand signal. By reducing the flow temperature to a minimum as it leaves
the boiler, OpenTherm modulation helps the boiler efficiency by running at lower flow temperatures for longer periods; this ensures more of
the heat exchanger is at condensing temperatures.
The EOGB Sapphire boiler is compatible with any OpenTherm multi zone system.
11.3
OpenTherm Wiring
Please consult the Manufacturers OpenTherm instructions on where to obtain the OpenTherm signal that is to be wired to the boiler.
Once obtained, wire the signal into the EOGB Sapphire wiring centre on terminals 6 and 7.
(See Fig 40)
DANGER
DANGER
Electrical
