Flue Systems - andrews CWH30/200 Installation, Operation And Maintenance Manual

20 20 SECTION 3 • INSTALLATION

FLUE SYSTEMS

Th e versatile fl ueing options will provide a solution to most
fl ushing requirements. Th e heater, when fi tted with
a concentric fl ue system, provides a room sealed
application. Th e concentric fl ue, 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 fi tted with
a conventional fl ue system, which can be obtained from
a specialist fl ue stockist. A fl ue system suitable for a
condensing pressurised system must be specifi ed.
Th e table and the concentric fl ue component below show
the maximum allowable length of fl ue for both systems.
Th e following pages show standard kits and additional
items for concentric fl ue supplied by Andrews. Horizontal
and vertical fl ue 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. Th e drawing shows some minimum
clearances for the fl ue terminal; in addition, the fl ue
terminal should be positioned where it will not cause a
nuisance from noise or from the combustion products
Model
Flue size (concentric)
Max. fl ue run – concentric (a)
Max. fl ue run – conventional (b) m
Max. fl ue static pressure
Max. fl ue gas volume
Max. fl ue gas temperature
(a) For a concentric fl ue/room sealed, reduce fl ue length by 1.2m for 90° bend, 0.7m for 45° bend and 1.5m
for condense trap.
(b) For a conventional fl ue, reduce fl ue length by 4m for 90° bend, 2m for 45° bend and 4 m for condense trap.
Th e different ventilation requirements for room sealed or conventional fl ue systems are given on pages 28 – 30.
CWH30
mm 80/125
m 14
50
Pa 140
m /h 41
3
°C 52
MAXXfl o Water Heater
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 fi tted when the
secondary fl ue 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. Th e terminal must be fi tted
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
fl ue components. See table on pages 20 and 23.
WARNING!
Th e fl ue system must be properly installed. Ensure the
inner fl ue is securely sealed at all the joints otherwise
incomplete combustion may result. Do not exceed
maximum fl ue lengths including elbows.
CWH60 CWH90
80/125 130/200
12 14
20 50
140 140
82 123
52 52
CWH120
130/200
14
40
140
164
52