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Table 6
Combustion air inlet & flue pipe requirements
SCA
45,60
75,100,125
150,200,250,300
Heater socket & pipe dia
mm
Flue pipe
80
100
130
Inlet pipe
80
100
130
Max. straight length
m
Flue pipe
9
9
9
Inlet pipe
9
9
9
Flue pipe
0.75
0.75
0.75
Equivalent length of 45° elbow
m
Inlet pipe
0.75
0.75
0.75
Equivalent length of 90° elbow
m
Flue pipe
1.5
1.5
1.5
inlet pipe
1.5
1.5
1.5
Concentric vertical vent or wall terminal:
types : Mugro/Burfix dia80 - Mugro/Burfix dia100 - Mugro/Burfix dia130
Concentric horizontal vent or roof terminal: types : Mugro/Burfix dia80 - Mugro/Burfix dia100 - Mugro/Burfix dia130
3.4 Air supply
It is important to ensure that there is an adequate air supply at
all times for both combustion and heating requirements.
Modern constructions involve the greater use of insulation,
improved vapour barriers, and weather proofing. This practice
means that buildings are sealed much tighter than in the past.
The combustion air supply for a power vented gas fired air
heater (Type B installation) can be affected by lack of air
supply. Natural infiltration may not be adequate. Use of extract
fans aggravates this situation. It is important to ensure that there
is an adequate air supply at all times. Reliance on doors and
windows is not allowed. Always ensure that an adequate inlet
for fresh air for combustion is provided sized to suit the total
installation of any combustion apparatus.
Fit an access guard to the combustion air inlet on the back of
the heater and take appropriate action to ensure that it remains
unblocked. See figure 2c.
WARNING: This model air heater is installed as a type B
application and is designed to take air for combustion from
the space in which it is installed. Do not restrict the
combustion air intake.
Figure 2c : Combustion air and flue pipe sockets
Type B
Legend :
¬
combustion products flue outlet socket
-
combustion air inlet opening
®
Protection grill (option)
SCA 45/60 :
PN 08 17512 01
SCA 75
→
125 :
PN 02 250090
SCA 150
→
300 :
PN 02 25094