EHC FUSION Series - Electrical Connections and Controls

8
GB-016C_f.783,2
ALL WIRING MUST BE CARRIED OUT IN ACCORDANCE WITH
CURRENT IEE REGULATIONS. BS 7671
ALL ELECTRICAL CONNECTIONS MUST BE MADE BY A QUALIFIED
ELECTRICIAN.
Load check must be taken into consideration when installing high
power boilers. This will be carried out by a qualified electrician.
There may be an additional requirement to upgrade the incoming
main fuse supplying the property if other high power devices
are used within the property. E.g Electric Showers. If an electric
shower is present we recommend that a Shower Sensor is
installed within the system. This will cause an interrupt to the
boilers control signal when the shower is in use. It will disable the
boiler protecting the electrical system from overload.
All boilers must be protected at the meter position with a 30mA
double pole RCD with a minimum of 3mm contact separation
accompanied by a suitably rated MCB. If the boiler is not fitted
local to the meter position then an additional isolation switch
must be fitted local to the boiler for each supply.
If the property is prone to lightening strikes or power cuts it is
recommended to install a suitable surge protection device to the
boiler supply. This will reduce the risk of damage to the boiler
electronics during these events.
THIS APPLIANCE MUST BE EARTHED.
All pipe work must be earthed in accordance with the current IEE
Regulations – BS 7671
After completion of all electrical works, an electrical safety check
should be carried out i.e. short circuit, earth continuity, resistance
to earth and polarity check, and all relevant Test Certificates
completed and issued to the customer.
Never open the front cover until all power supplies to the boiler
have been disconnected.
ELECTRICAL CONNECTIONS
The boiler connections are clearly marked inside the boiler L N
E (24hr LIVE).
The 24hr live is the permanent Feed connection to the boiler from
the mains supply. External controls will require an independent
fused spur supplied from the consumer unit, however this fused
spur should be supplied by the same power source & protected
by the same RCD as the boiler itself, the control circuit should
be protected by a 6Amp MCB. The Boiler & control circuit RCD
should be independent of all other domestic circuits. The boiler
supply cable should be calculated by the means of a cable
calculation in accordance with BS7671 by a suitably qualified
electrician.
Boiler Protection
The recommended protection boilers are as follows:
Model No. Boiler size Protection
FUSION 48Kw 48kW BOILER 80 AMP Protection Per Phase
FUSION 36Kw 36kW BOILER 63 AMP Protection Per Phase
FUSION 14.4kW 14.4kW BOILER 80 AMP Protection
FUSION 12kW 12kW BOILER 63 AMP Protection
FUSION 9kW 9kW BOILER 50 AMP Protection
FUSION 6kW 6kW BOILER 32 AMP Protection
External controls
We recommend the use of the EHC SINGLE CHANNEL PROGRAMMER
and ROOM THERMOSTAT for heating only installations.
For Heating and Hot water installations, we recommend the
use of our “Twin Heat Pack” which includes the EHC ROOM
THERMOSTAT & AN EHC 2 CHANNEL PROGRAMMER. The
heat pack will incorporate all the relevant parts to comply with
current building regulations i.e. Motorized valves to control the
heating and hot water circuits and Room and cylinder thermostats
to control the room and water temperatures. This will also provide
boiler interlock. The use of TRV’s alone will not provide boiler
interlock.We recommend the use of TRV’s, however they must not
be used
in the room that has the room thermostat fitted.
Note: this control method is to comply with current building
regulations provided by BEAMA (British Electrotechnical and Allied
Manufacturers Association).
Programmer/Stat connections
The boiler PCB has a voltage free connection for the controls
(RP). Under no circumstances should 240V be connected to the
controller block as this will damage the boiler’s PCB and Void
the Manufacturers warranty.
The stat / programmer connections are clearly marked within the
boiler.
Only after all connections have been made and checked should
the system be filled with water and set to the proper pressure 1.5
bar (Sealed systems).
Check the system for leaks. If water leaks into the boiler this may
damage the boiler electrics and the manufacturers warranty will
be invalid.
Under no circumstances should the boiler be switched on when
the system is dry.
The boiler has an inbuilt flow sensor. If the boiler has been
switched on with a low or no water content, the system flow
meter will sense this and prevent the boiler from sending power
to the main elements.
If an off-peak electric meter has been installed by an Electricity
Company to supply uninterrupted Off-Peak rate electricity at
selected times, the appropriate settings should be entered into to
the system programmer to take advantage of the OFF-peak rate
electricity.
ELECTRICAL CONNECTIONS AND CONTROLS
CONTROL PANEL WIRING CONNECTIONS
To main
control
board
Flow sensor
Outlet ow
sensor
connection
Inlet return
sensor
connection
Volt free
control
connection
To main control board
Flow sensor
Outlet ow sensor
connection
Inlet return sensor
connection
Volt free control
connection
UNDER NO CIRCUMSTANCES
SHOULD A VOLTAGE BE
TAKEN TO THE NA OR RP
CONNECTION AS THIS WILL
DAMAGE THE CONTROL
PCB AND INVALIDATE THE
WARRANTY
Q
Tout
Tin
NA