1103UDSA-2--EN, Pag. 8/36
7. Flue
requirements
Model UDSA-2 heaters may be installed as Type-B and Type-C installations.
Flue must be in accordance with BS6230 or BS5440. Local requirements may ap-
ply in addition to national requirements. These unit heaters are designed to operate
safely and effi ciently with either a horizontal or vertical fl ue system when installed
with the specifi c requirements and instructions.
If this heater is replacing an existing heater, be sure that the fl ue is sized properly for
the heater being installed and that the existing fl ue is in good condition. A properly
sized fl ue system is required for safe operation of the heater. An improperly sized
fl ue system can cause unsafe conditions and/or create condensation.
The air heaters may be installed as a balanced fl ue (type C) heater requiring both a
combustion air inlet duct and a fl ue pipe or as a power vented heater (type B) (the
combustion air is taken from the space where heater is installed), which requires
only a fl ue pipe exhausting to outdoors.
All products of combustion must be fl ued to outdoor atmosphere.
Each heater installed as a type B appliance must be fi tted with an individual fl ue
pipe and the combustion air inlet opening is provided with a protection grill. Each
heater installed as a type C appliance must be fi tted with an individual combustion
air/fl ue pipe system. Type C2 appliance, with single duct system for supply of
combustion air and evacuation of fl ue gasses, are not allowed.
Flue pipe diameters and maximum pipe lengths in table 5 apply to both horizontal
and vertical systems. Add all straight sections and equivalent lengths for elbow.
The total combined length must not exceed the maximum fl ue length.
Diameter & maximum
fl ue pipe lengths
IMPORTANT :
The fl ue must be installed in accordance with national and local regulations.
Failure to provide proper fl ueing could result in death, serious injury and/or
property damage. The air heater must be installed with a fl ue to the outside
of the building. Safe operation of any power vented gas apparatus requires
a properly operating fl ue system, correct provision for combustion air and
regular maintenance and inspection.
Table 5 : maximum fl ue system pipe lengths
• Use only one diameter of fl ue pipe on an installation.
• Recommended minimum fl ue is 1m.
Model UDSA
008-2 → 020-2 025-2 → 050-2 055-2 → 100-2
Heater socket & pipe dia mm
fl ue pipe 80 100 130
inlet pipe 80 100 130
Max. straight length (with wall/roof terminal) m
fl ue pipe 9 9 9
inlet pipe 9 9 9
Equivalent length of 45° elbow m
fl ue pipe 0.75 0.75 0.75
inlet pipe 0.75 0.75 0.75
Equivalent length of 90° elbow m
fl ue pipe 1.5 1.5 1.5
inlet pipe 1.5 1.5 1.5
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