4
GB-031C_f.625
All Fusion Electric Boilers have a 22mm compression connection
at the boiler’s flow and return pipes. Please note that the boilers
are supplied with blank washers fitted for transit purposes. These
must be removed before connections to pipe-work can be made.
The flow (red) and return (blue) are clearly marked on the external
case and under no circumstances should these connections be
reversed. Hot connections are not recommended at the boiler for
future maintenance and boiler disconnection. Lockshield valves
are recommended.
Remove outer screws at the bottom of the boiler and pull the front
cover outwards taking care to remove internal earth connections.
Earth connections must be re-connected before the boiler case is
re-installed.
We recommend that lockshield isolation valves are fitted on the
flow and return pipework. Such valves must be „full way” and
not „ball valves”. The installation of „ball valves” in the flow and
return pipework will reduce the recommended flow rate through
the boiler and promote premature boiler shutdown.
An auto air vent is integral within the boiler however an addi-
tional auto air vent must be fitted at the cylinder coil if the boiler
is being used for central heating and domestic hot water.
Calculate the „space heating” requirements in accordance with
BS EN 12831 and BS EN 14336. If the boiler is to heat the do-
mestic hot water, an additional allowance of 3kW (10,239 Btu’s)
should be made to the ‘space heating’ calculation.
Where practical, and if at all possible, we recommend that all
pipe-work be insulated, in particular the primary pipe-work
with-in a boiler cupboard. This is to reduce heat loss and reduce
high cupboard temperatures from exposed pipe-work. (BS 6700:
2006+A1: 2009).
The boiler has an integral automatic bypass valve fitted which
should be set to the relevant settings to allow the minimum flow
rates to pass through the boiler (8 l/min) when all radiator thermo-
stats and zone valves are closed.
Allowance should be made for a radiator to be installed within
the heating circuit and locked open. This will be located in the
room that has the room thermostat installed.
To comply with building regulations, Part L and Part J (in Scot-
land), room and cylinder stats must be fitted.
the heating system (sealed systems). Reference should be made
to BS EN 14336 for the method of filling and make up of water.
There must be no direct connection between the boilers central
heating system and the main water supply. When mains water is
required to fill the system directly, all local water bylaws must be
observed, and any connection made must be disconnected after
use.
The system to within 10% of mains water PPM
to ensure that no debris is trapped in the flow sensor as this may
result in boiler failure. Where existing radiators and pipe-work
are utilized a power flush must be carried out to remove debris.
All boilers are tested to 4.0 bar. The normal working pressure of
the boiler should be set to approx 1.0 / 1.5 bar. All sealed sys-
tems should comply with the relevant building regulations and
standards, including BS EN 13831 – Specification for Expansion
Vessels.
In order to protect the Flow Sensor located within the boiler, it is
imperative that the pre-installed magnetic filter is removed and
cleaned at least annually. Failure to carry out this action will in-
crease contamination of the boiler by system residue.
The Fusion Comet range of boilers can be used in various system
designs. Please refer to The Electric Heating Company for more
details on our Fusion Boiler for under floor heating. We are able
to supply a heat pack that contains the relevant control valves,
cylinder and room thermostats required to configure an „S” plan
heating system. The heat pack has all the necessary components
that you need to connect the systems controls and plumbing con-
figurations for „S” Plan design.
We recommend the use of thermostatic radiator valves on all ra-
diators except in the room that has the wall thermostat fitted. This
radiator should be fitted with lock shield valves and left in the
fully open position.
The boiler has an integral automatic bypass valve fitted which
should be set to the relevant settings to allow the minimum flow
rates to pass through the boiler (8 l/min) when all radiator thermo-
stats and „zone valves are closed”.
Systems should be designed to meet the current building regula-
tions in force at the current time.
1. Hang the boiler in a vertical position on the fixing points and
screws provided, with the flow and return connections to the
bottom of the boiler, maintaining the clearances as per Figure
12 of this manual.
2. Connect the boiler to a heating system that is equipped with
isolation valves (see Figures 4 & 5).
3. Fill the heating system with treated water, which will substan-
tially extend the life of the heating coils. See item 14 „System
Protection” below.
4. Connect the boiler to the „mains” electrical system as per
Figures 6, 8, 9 & 11 using conductors sizes as per as specified
in the Technical Specification on page 17 of this document.
5. Connect the room thermostat / Programmer using the two
control conductors marked RP as in Figure 7 & 10.
6. For all other electrical connections refer to the ELECTICAL
CONNECTIONS & CONTROL section of this manual.
