Flue Systems - andrews CWH30/100 Installation Manual, Operation And Maintenance Manual

SECTION 3

FLUE SYSTEMS

18
INSTALLATION
The versatile flueing options will provide a solution to most flushing req uirements.
The heater when fitted with a concentric flue system provides a room sealed application.
The concentric flue, supplied by Andrews, is available for either horizontal or vertical
installation and the table below shows the basic kit supplied plus optional extras.
Alternatively the heater can be fitted with a conventional flue system, which can be
obtained from a specialist flue stockist. A flue system suitable for a condensing pressurised
system must be specified.
The table and the concentric flue component below show the maximum allowable length
of flue for both systems.
Model
Flue size (concentric)
Max. flue run - concentric (a)
Max. flue run - conventional (b) m
Max. flue static pressure
Max. flue gas volume
Max. flue gas temperature
(a) For a concentric flue/room sealed reduce flue length by 1.2m for 90º bend, 0.7m for
4 5 º bend and 1.5 m for condense trap .
(b) For a conv entional flue reduce flue length by 4 m for 90º bend, 2m for 4 5 º bend and
4 m for condense trap .
The different ventilation req uirements for room sealed or conventional flue systems are
given on pages 27-29.
Th e follow ing p ag es sh ow standard k its and additional items for concentric
flue sup p lied b y A ndrew s. Horiz ontal or V ertical flue k its must b e ordered
sep arately , flue k its are not included in th e h eater p rice.
G E N E R A L
Flue terminals must be installed in accordance with the Clean Air Act to ensure the
products of combustion are properly dispersed. The drawing shows some minimum
clearances for the flue terminal, in addition the flue terminal should be positioned where
it will not cause a nuisance from noise or from the combustion products accumulating.
Please contact Andrews's technical department if advice is needed for a particular
installation. See drawings on page 25.
If installed in a roof valley the terminal should be at least 1m above the highest part of
the roof structure and 2.5m from any adjacent structure.
The terminal must be fitted with a guard if less than 2m above ground level or in a
position where it may cause injury to persons resulting from touching a hot surface.
Guards can be ordered with flue components, see table on pages 19 and 22.
Warning!
The flue system must be properly installed. Ensure the inner flue is securely sealed at all
the joints otherwise incomplete combustion may result.
D o not exceed maximum flue lengths including elbows.
.
CWH30 CWH60
mm 80/125 80/125
m 14
50
Pa 140 140
M 3 /h 41
ºC 52
CWH90 CWH120
130/200 130/200
12 14
20 50
140
82 123
52 52
14
40
140
164
52