Flue Systems - andrews MAXXflo Installation, Operation And Maintenance Manual

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SECTION 3 • INSTALLATION

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 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.
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.
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.
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 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.
CWH30
mm 80/125
m 14
50
Pa 140
m /h 41
3
°C 52
MAXXflo Water Heater
GENERAL
Flue terminals must be installed in accordance with
BS 5440 and IGE/UP/10 to ensure the products of
combustion are properly dispersed. The drawing on page
27 shows minimum clearances for the flue terminals.
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.
CWH60 CWH90
80/125 130/200
12 14
20 50
140 140
82 123
52 52
CWH120
130/200
14
40
140
164
52