Requirements For Connection To Chimneys Or Venting; Systems; Flue Pipe Installation - Buderus Logano GC 124 II Installation And Service Instructions Manual

(crawl space or attic). The shortest dimension of all inlet and outlet
openings must not be less than three inches.
▶ If there is a direct connection to the outside, each opening must have
a minimum cross-section of one square inch per 4000 Btu/h of the
total combustion output of all gas-fired appliances inside the closed
room.
▶ If there is a connection to the outside through vertical ventilation
ducts, each opening must have a minimum cross-section of one
square inch per 4000 Btu/h of the total combustion output of all gas-
fired appliances inside the closed room.
▶ If there is a connection to the outside through horizontal ventilation
ducts, each opening must have a minimum cross-section of one
square inch per 2000 Btu/h of the total combustion output of all gas-
fired appliances inside the closed room.
▶ If the openings are connected to ventilation ducts, the ducts must
have the same cross-section area as the openings.
9 Requirements for connection to chimneys or
venting systems
The flue connection must comply with the regulations of the National
Fuel Gas Code, Part 7, Venting of Equipment, and the local construction
codes.
Flue connections of heating systems with natural venting must not be
connected with any component of a mechanically operated venting
system that operates with overpressure.
The cross-section of the flue connection must not be less than that
specified ( table 3, page 5).
If the boiler is to be connected to a brick chimney, the chnimney must be
thoroughly inspected before use. The chimney must be clean, in
compliance with construction codes and of sufficient dimensions.
Chimneys with an internal liner are preferred and are only permitted if
the liner complies with all national, state and local construction codes.
Liners of fire-glazed brick with moisture-proof joints and liners of
corrosion-resistant material are recommended. Contact the local gas
supply company for advice and recommendations for flue connection
and chimney liners. A flue pipe of single-walled sheet metal is required
for flue connections for type II models.
An adequate chimney height in compliance with the tables of the
National Fuel Gas Code, ANSI Z 223.1, is required.
Separation of a boiler from a common flue system
If an existing boiler is separated from a common venting system, the
venting system will then be too large to guarantee correct venting for the
heating systems that remain connected to the system.
Test the venting system by the following procedure:
Carry out these steps with every heating system that remains connected
to the venting system when the boiler is separated from a common
venting system. Every heating system must be started in operation and
the other heating systems must remain turned off.
▶ All unused openings of the common system must be sealed.
▶ Inspect the venting system to ensure that it has the correct
dimensions and longitudinal inclination. Make sure that the system is
not blocked, leaking, corroded or has any other faults that cause it to
operate improperly.
Logano GC 124 II – 6 720 804 440 (2012/11)
Requirements for connection to chimneys or venting systems
▶ If necessary, close all doors and windows in the building and all doors
between the space in which the heating systems that remain
connected to the venting system are installed and the other rooms of
the building. Turn off washing machines and dryers and all appliances
that are not connected to the venting system. Run all venting fans and
bathroom exhaust fans at maximum speed. Fans in use in summer
must remain in operation and oven exhaust system flaps must be
closed.
▶ Now start the heating system that is to be tested. Follow the
instructions for starting. Set the thermostat for continuous operation.
▶ After the main gas burner has been operating for five minutes, check
the opening at the back flow check for drafts with a match flame or a
candle, or with the smoke of a cigarette, cigar or pipe.
▶ Then all heating systems that remain connected to the venting system
have been checked as above to ensure that the venting operates
properly, return all doors, windows, exhaust fans, oven exhaust flaps
and all other gas-fired appliances to their original position.
▶ Any incorrect status of the common venting system must be corrected
to ensure that the heating system complies with the regulations of the
National Fuel Gas Code, ANSI Z 223.1. If the size of any component of
the common venting system is changed, the complete venting system
must be resized to comply with the relevant tables in Part 11 of the
National Fuel Gas Code, ANSI Z 223.1.
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Flue pipe installation

This section describes the connection of the flue pipe and venting
system. Note that the open draft hood cannot be modified under any
circumstances.
The boiler can and may only be operated with the
electrical vent damper that is standard supplied with
every GC124.
▶ The flue collar is factory installed on the flue connection of the open
draft hood and fastened with four (4) corrosion-resistant sheet metal
screws.
The vent damper supplied with the boiler must be used for venting the
boiler only.
The position of the vent damper position blade must be visible.
The open draft hood must be at least six inches from all combustible
surfaces.
The vent damper must be freely accessible for maintenance.
The vent damper must be open when the main burner of the boiler is
operating.
Installation of vent damper
▶ Install pins in the hole of the vent damper blade for the II models only.
▶ Fasten vent damper to the flue collar of the open draft hood with three
(3) corrosion-resistant sheet metal screws.
Connecting flue pipe
▶ Connect flue pipe to the chimney with the shortest possible length of
flue pipe.
Use only flue pipes with the proper diameter for the boiler.
Every horizontal section of the flue pipe must have a minimum rise of 1/
4 inch per foot towards the chimney. The flue pipe must be securely
fastened to prevent it from hanging. A support must be installed at least
every five feet. Fasten every connection with at least three (3) corrosion-
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