A.O. Smith TWI 35-130, Instruction Manual

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24 Instruction manual TWI 35-130 G/TWI 45-190 G
Device Diameter Maximum length Maximum num-
ber of 90° bends
TWI 35-130 80/125 20 5
TWI 45-190 80/125 20 5
Explanation of device types
Remark
Make sure that the fl ue gas discharge is positioned in a discharge area in
which discharge is allowed for the respective device type.
3.9.3 Concentric connections
The table gives the requirements that the concentric systems shall meet.
Warning
Mount fl ue gas discharge material with a fall of 5 mm per metre towards
the device.
Requirements for fl ue gas discharge for concentric systems (C13, C33)
Caution
Both conditions given in the table shall be complied with.
When using less than the maximum number of bends, it is still not allowed to
use more than the maximum pipe length.
When using less than the maximum pipe length, it is still not allowed to use
more than the maximum number of bends.
All this will be explained using an example.
Practical example of concentric fl ue gas discharge
Example
The fi gure shows a TWI 35-130. The device shall be provided with a 15 m
concentric pipe (C13/C33) and four 90° bends. An inspection shall be carried
out for compliance of this con
fi guration with the requirements stated in the
table.
3
Device types Description
B23 Combustion air is extracted from the installation area.
C13 Concentric and/or parallel wall fl ue terminal
C33 Concentric and/or parallel roof fl ue terminal
C43 Devices on common supply and discharge (concentric and/or parallel) in
blocks of
fl ats.
C53 Supply and discharge in different pressure area.
C63 Devices delivered without fl ue gas discharge materials and/or terminal. These
devices are to be installed in accordance with the applicable local guidelines.
Installation