Installation guide

XXXXXXXXX • SECTION XX
19
INSTALLATION • SECTION 3
FLUE SYSTEMS
The versatile flueing options will provide a solution to most
flushing requirements. 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
t
he 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.
The following pages show standard kits and additional
items for concentric flue supplied by Andrews. Horizontal
and vertical flue kits must be ordered separately. Flue kits
are not included in the heater price.
GENERAL
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 technical
department if advice is needed for a particular installation.
See drawings on page 26.
We recommend that a condensate trap be fitted when
the secondary flue length is over 1.5m.
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 20 and 23.
WARNING!
The flue system must be properly installed.
Ensure the inner flue is securely sealed at all the
joints otherwise incomplete combustion may result.
Do not exceed maximum flue lengths including
elbows.
19
Model CWH30 CWH60 CWH90 CWH120
Flue size (concentric) mm 80/125 80/125 130/200 130/200
Max. flue run – concentric (a) m 14 12 14 14
Max. flue run – conventional (b) m 50 20 50 40
Max. flue static pressure Pa 140 140 140 140
Max. flue gas volume m
3
/h 41 82 123 164
Max. flue gas temperature °C 52 52 52 52
(a) For a concentric flue/room sealed, reduce flue length by 1.2m for 90° bend, 0.7m for 45° bend and 1.5m
for condense trap.
(b) For a conventional flue, reduce flue length by 4m for 90° bend, 2m for 45° bend and 4 m for condense trap.
The different ventilation requirements for room sealed or conventional flue systems are given on pages 28 – 30.