EHC SLIMJIM Installation & Technical Manual page 6

1. General
The boiler must be installed by a professional plumber or heating engineer and must be connected to
the public low voltage network by a competent person. We recommend this is installed by a 17th Edition
certified Electrician.
The Electric Heating Company Ltd will not be held responsible for any faulty installations which
are performed by un-qualified tradespersons.
2. Pipe Connections
Slim Jim Electric Boilers have 22mm compression connections at the boiler's flow and return pipes. Please
note that the boilers are supplied with blanking plugs for transit purposes. These must be removed before
connections to external pipes can be made.
The Flow Outlet (Top Red Connection) and Return Inlet (Bottom Blue Connection) are clearly marked
within the boiler case. Under no circumstances should these connections be reversed. Hot Soldered
Joints should not be made as a direct connection to the boiler, Compression joints should used.
3. Case Removal
In order to take off the front cover, undo the fixing screws at the top and bottom of the unit and pull the
cover toward you, Care should be taken not to damage the front controller.
4. Isolation Valves
We recommend that lock-shield isolation valves are fitted on the Flow and Return pipe-work. Such valves
must be full bore and not "ball valves". The installation of "ball valves" in the flow and return pipe-work
will reduce the recommended flow rates through the boiler.
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Care must be made when installing the isolation valves that the PRV and expansion positions
are not impaired.
5. Auto air vents
An auto air vent must be fitted to the external pipe work when installed in an unvented system.
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Do not install AAV's directly above the SlimJim boilers. AAV's should be installed to either the
top left or right hand side of the boilers. (This is to prevent any water entering the boiler in the event
of an AAV leaking).
6. Boiler Sizing
Calculate the "Space Heating" requirements in accordance with BS EN 12831 and BS EN 14336. If the
boiler is to heat the domestic hot water, an additional allowance of 3kW (10,239 Btu's) should be made
to the "Space heating" calculation to determine the correct boiler output.
7. Insulation
Where practical, and if possible, we recommend that all pipe-work is insulated, in particular the primary
pipe-work within a boiler cupboard. This is to reduce heat loss and reduce high cupboard temperatures
from exposed pipe-work. (BS 6700 +A1).
8. System Design
As the SlimJim boilers are of low water content an open circuit must be achieved incorporating approx 2
metres of continuous 22mm pipe work after the boiler connections and before any zone valves. (S Plan)
We also recommend that a magnetic filter is used and installed into the return pipe work of the system
before the pump as per the schematic on page 10. Provision should be made to allow the filter to be
cleaned without draining the full heating system.
GB-063C_f.615
GENERAL
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