Flue System; Flue System General Requirements - Lochinvar HERALD HCB46CE Installation Manual

10.0 FLUE SYSTEM

All versions of the Herald Condensing boiler can be installed as either type B23 (fan assisted open flue) or C13, 33,
C53 (room sealed) appliances. See the relevant section for details of each flue type and requirements. Standard flue
kits are available as an ancillary item, these include the standard pieces to start the flue system, additional elbows,
extensions will probably be required depending upon site installation requirements. Further information including part
numbers is available in the separate flue guide available from
10.1

FLUE SYSTEM GENERAL REQUIREMENTS

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 should be taken into account
during the design phase of the heating installation.
Herald boilers 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.
Herald boilers 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.
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.
Before installation of any flue system read the installation manual carefully for both the
appliance and flue system to be used. Information on the flue system Supplied by Lochinvar
can be found within this manual.
Detailed recommendations for the flue system are given in BS5440-1 for equipment of rated input not exceeding 70kW
net, BS6644 for equipment above 70kW net and IGE/UP/10 for equipment of rated input above 54kW net. The following
notes are intended to give general guidance only.
www.lochinvar.ltd.uk
16