Bosch WR430-7K - Manuel (Page 8)

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Bosch POWER VENTING SYSTEM
VENT TERMINAL INSTALLATION:
Before installing Bosch WR430-7K determine the location of vent system termination which may be immediately
connected with a 90° elbow or with a maximum lineal length of 15 feet including two 90° elbows. (See Fig. 1)
Note: In cold climate areas negative air pressure such as unbalanced heating and ventilating systems can
cause reverse air flows in gas vent and chimney systems. Under extreme cold conditions this can cause
freezing and damage Bosch heat exchanger during prolonged period of times when they are not in use,
such as night time hours. Vent termination with back draft flapper is supplied in order to minimize outside
air infiltration and risk of freezing equipment.
The approved terminal shall be so arranged for flue gases to be directed in a manner which will not jeopardize
people, overheat combustible structures or enter into buildings, and that proper clearances are maintained (See
Fig. 2 )
a) The vent terminal of this Power Vent System shall not be less than 7 feet (213cm) above grade when
located in areas accessible to public walkways.
b) A vent terminal shall terminate at least 3 feet (91cm) above and a minimum of 10 feet (305cm) horizontally
from any (mechanical) air inlet.
c) The vent terminal shall not be within 6 feet (183cm) radius from a gas meter or regulator, and horizontally
it must be a minimum of 3 feet (91cm) from the centre line of such regulator.
d) The vent terminal shall be a minimum of 6 feet (182cm) from any combustion air inlet.
e) The vent terminal shall terminate from an opening window, at least 4 feet (122cm) below or below the
opening and 12 inches (30cm) horizontally. From a door 1 foot (30cm) above and 9 inches (23cm)
horizontally.
f) The vent terminal shall not be less than 3 feet (91cm) from an adjacent building.
g) The vent terminal shall not be less than 2 feet (61cm) above grade.
90° el
12 ft straight
(5.7m)
90° el
90° el
90° el
15 ft straight
(4.6m)
3 ft straight
(0.3m)
MAXIMUM LENGTH OF ALL PIPE LENGTHS
MUST NOT EXCEED 15 FT (4.6M)