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11 FLUE GAS AND AIR SUPPLY SYSTEM
General
The water heater has a positive pressure flue system. For a single water heater, the available combined pressure
drop for the inlet and outlet system is 200 Pa for the complete water heater range.
The EFW water heater is for either using outdoor combustion air or for installation using indoor combustion air.
All products of combustion are vented directly outdoors. The Vent, and if applicable Air-Intake piping, must be
piped to the outdoors. Under no conditions may this appliance vent gases into a masonry chimney. The internal
safety system shuts down the water heater in case the temperature of the flue gasses becomes too high, after
which the appliance will not run until re-started. Installations must comply with local requirements.
The front cover closes the housing air-tight making sure air is only supplied by the vent air intake. Therefore,
make sure the front cover is always placed in its position during operation of the appliance.
All flue resistance causes power decrease. At 200 Pa resistance the power decrease is 5%.
Notice:
If the total combined net input of the installation is > 333kW then approval of the height and position of any
termination must be obtained from the local authority BEFORE installation to satisfy the requirements of
the clean air act.
Install the horizontal flue components with an angle of 3° back in the direction of the boiler (roughly equal
to five centimetres for every linear meter). Failure to install the flue correctly will result in a build-up of
condense within the flue pipework that will cause early component failure.
When using a wall terminal, there is the possible risk of ice building-up on surrounding parts/structures,
because the condensate will freeze. This risk must be taken into account during the design phase of the
heating installation.
EFW water heater will produce large condense clouds especially during cold weather, consideration must be
taken as to whether this will cause a nuisance to neighbouring properties and if so alternative flue
arrangements used.
The EFB boiler can operate with very low flue temperatures; as such the flue system used must be suitable
for use with condensing appliances made from either Polypropylene or stainless steel and have a
temperature class of T120.
For flue gas type B23, C13, C33, C43 systems, use only flue gas and air supply parts of the approved supplier
M&G group (Muelink & Grol) and only the parts mentioned in the DoP (declaration of performance): "No
001-MG-PP DoP" and No 001-MG-RVS DoP". (With exception of O4 and O5) The concerning DoP's can be
found at the website of Muelink & Grol
The following Manuals for parts supplied by Muelink & Grol are applicable:
- Regulations regarding flue gas systems PP(s)
- Installation instructions clamps: Checklist
- Installation instructions Skyline 3000
- Installation instruction Multiline PP (Cascade)
Aluminium flue pipe must not be used on this appliance as it may lead to premature failure of the heat
exchanger and will invalidate the warranty.
Under no circumstances may this appliance exhaust gases into a masonry chimney.
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https://www.mg-flues.com/certifications
E93.1804.014
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