EHC Comet Combi 12kW, Инструкция по установке и техническому обслуживанию, Страница: 15 / 28

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28.06.2017
9. Electrical Connection
ALL WIRING MUST BE CARRIED OUT IN ACCORDANCE
WITH CURRENT IEE BS7671 WIRING REGULATIONS.
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 IEE BS7671
Wiring Regulations.
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 of the boiler until all power supplies
to the boiler have been disconnected.
ELECTRICAL CONNECTIONS
The electrical supply cables can be routed in to the boiler from
the top left hand side of the unit. Cable grommets are supplied
and fitted to the boiler's cable entry point.
All cables should be secured to meet current regulations. The
boiler connections are clearly marked inside the boiler
L- Live, N - Neutral, E - Earth.
The supply is a permanent Feed connection to the boiler from
the mains supply and should never be isolated unless for main-
tenance purposes.
The Boiler circuit RCD should be independent of all other do-
mestic circuits. The boiler supply cable should be calculated by
the means of a cable calculation in accordance with BS7671 by
a suitably qualified electrician.
N
L
Boiler Protection
The recommended protection for hard wired boilers are as fol-
lows:
Model No Boiler size Protection (per phase)
Comet Combi 14.4kW 14.4kW BOILER 80 AMP Protection
Comet Combi 12kW 12kW BOILER 63 AMP Protection
Comet Combi 9kW 9kW BOILER 50 AMP Protection
EXTERNAL CONTROLS.
We recommend using EHC controls that are supplied with the
boiler. The boiler come with a twin zone programmer and room
thermostat.
The use of EHC controls ensures that boiler interlock is provided
as 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.
BACK UP IMMERSION HEATER
The Comet Combi has a connection that allows you to install a
back up immersion heater if required. It is recommended that
this is connected via a local 16A double pole isolation switch
and connected to the consumer unit using the correct size cable
& 16A MCB