Operating Instructions and Installation Instructions

Installation
32 Instruction manual BFM
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3.9.7 Installing chimney flue components for BFM 100, 120
The air supply duct (1) and chimney flue (2) for the BFM 100 and 120 emerge
separately from the top box. They must be connected to the concentric wall flue
terminal or roof flue terminal by means of a transition piece.
Parallel connection BFM 100, 120
A.O. Smith prescribes the use of a concentric roof or wall flue terminal,
exclusively of a type approved for the appliance. Use of an incorrect roof or wall
flue terminal can cause the installation to malfunction.
You must also fulfil the following requirements:
• The maximum permissible length of chimney pipe (A+B+C) is 7 metres.
• The maximum permissible number of 45° or 90° bends is 2.
• If you are using a horizontal pipe, you must mount it with a minimum run-off
of 5 mm per running metre of pipe towards the appliance!
• The transition piece to convert the air supply and chimney flue from parallel
to concentric must be installed immediately before the wall or roof flue
terminal.
• The intake duct of the air supply must be approximately the same as the
chimney flue.
• Make sure that the chimney flue discharges into an area approved for this
type of appliance.
See the figures. Wall flue terminal (3.9.8 "
Concentric wall flue terminal BFM
100, 120") and Roof flue terminal (3.9.10 "Concentric roof flue terminal BFM
100, 120") for examples of installation.
Legend
1. Air supply
2. chimney flue
IMD-0252 R1
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