1801UDSBD-4E,--EN, Pag. 10/35
Figure 2g : Blower curves for UDSBD064-4E
Model UDSBD-4E heaters may be installed as Type-B and
Type-C installations.
Local requirements may apply in addition to national
requirements. These unit heaters are designed to operate
safely and efficiently with either a horizontal or vertical flue
system when installed with the specific requirements and
instructions.
If this heater is replacing an existing heater, be sure that
the flue is sized properly for the heater being installed and
that the existing flue is in good condition. A properly sized
flue system is required for safe operation of the heater. An
improperly sized flue system can cause unsafe conditions
and/or create condensation.
The air heaters may be installed as a balanced flue (type
C) heater requiring both a combustion air inlet duct and
a flue 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 flue pipe exhausting to
outdoors.
7
FLUE REQUIREMENTS
Each heater installed as a type B appliance must be fitted with
an individual flue pipe and the combustion air inlet opening
is provided with a protection grill. Each heater installed as a
type C appliance must be fitted with an individual combus
-
tion air/flue pipe system. Type C2 appliance, with single duct
system for supply of combustion air and evacuation of flue
gasses, are not allowed.
IMPORTANT :
The flue must be installed in accordance with national
and local regulations. Failure to provide proper flueing
could result in death, serious injury and/or property
damage. The air heater must be installed with a flue to
the outside of the building. Safe operation of any power
vented gas apparatus requires a properly operating flue
system, correct provision for combustion air and regular
maintenance and inspection.
Diameter & maximum flue pipe lengths
Flue pipe diameters and maximum pipe lengths in table 5 ap-
ply to both
horizontal
and
vertical
systems. Add
all
straight
sections and equivalent lengths for elbow.
The total combined length
must not exceed
the maximum
flue length.
