Installing The Boiler; Connecting The Fuel Supply - Buderus LOGANO PLUS GB312 Installation Instructions Manual

6

Installing the boiler

This section details how to install the boiler. The individual steps
involved are:
• Flue and air supply system
• Heating circuit connection

• Connecting the fuel supply

• Electrical connection
General notes on installing the flue and air supply system
The boiler requires a flue system approved for Category IV (condensing,
positive pressure; to ANSI Z21.13/CSA4.9). The material must consist
of AL 29-4C stainless steel and conform to UL 1738 or UL 103.
In Canada, the flue system material must conform to ULC-636.
We recommend stainless steel flue systems made by the following
manufacturers:
Manufacturer Flue system
heat fab Saf-T Vent EZ Seal
Z-Flex Z-Vent IV special gas vent
Metal Fab CorrGuard
Pro-Tech Fasnseal
Table 6 Recommended flue systems
In the US, Category IV plastic flue systems can also be used. We
recommend the following manufacturers:
Manufacturer System
Centrotherm Inno Flue SW
Spears, Charlotte CPVC pipe Schedule 80 ASTM D1784, PVC
pipe Schedule 40 ASTM D1784
Table 7 Recommended systems for the USA
If a plastic system (CPVC) is used in Canada, it must be approved as a
type "BH gas venting system" (ULC-S636). Components made by
different manufacturers must not be used in the same flue system nor
may any uncertified components or materials be used in the flue system.
The components, adhesives and adhesive primers specified by the flue
system manufacturer must be used. Only components, adhesives,
adhesive primers, etc. made by the same manufacturer may be used.
The following systems are approved for use in Canada and may be used
with this boiler:
Manufacturer Flue system
Centrotherm Inno Flue SW
IPEX System 636 CPVC,
System 636 PVC
Table 8 Recommended flue systems for Canada
Flue/air supply system installation must comply with Part 10, Venting of
Equipment, of the National Fuel Gas Code NFPA 54 (ANSI Z223.1), or
CAS B.149 or other applicable local building code regulations.
The flue and air supply system (for design of flue connection
 Section 6.5, page 20) must be designed for a max. pressure of
0.40 inches W.C. for the overall system (flue and air supply system).
Logano plus GB312 – 6 720 647 367 (2012/11)
Observe the following points when installing the flue ducting:
• The cross-sectional area of the flue pipe must be calculated according
to the applicable regulations. Guidance on the dimensioning of the
flue/air supply system can also be obtained in the Application Manual
GB312 US/CA.
• Select the shortest possible route for the flue pipe.
• Install flue pipes with an upward slope from the boiler (¼ " per foot).
We recommend the fitting of a protective grille (bird screen) to the flue
pipe terminal.
For details of correct dimensioning, contact the venting manufacturer
concerned.
All instructions relating to all parts of the flue system,
and especially the instructions of the flue system
manufacturer, must be followed. Use only flue pipes with
the appropriate diameter for the output rating of the
boiler and made by the recommended manufacturers
listed in table 6, 7 or 8.
Flue system for multi-boiler systems (cascading systems)
These instructions relate only to single-boiler systems. Flue/air supply
systems for multi-boiler systems must be designed by qualified heating
engineers and approved and guaranteed by the flue system
manufacturer. The flue system must prevent back-flow of flue gas
through boilers that are not in operation.
DANGER: Risk of fatal injury from escaping flue gases in
the boiler room.
▶ The seal in the condensate pan flue connection must
be present, undamaged and correctly inserted.
▶ Fitting an air inlet flap in the flue system is not
permitted.
CAUTION: Risk of system damage due to inadequate
condensate drainage.
▶ The condensate that forms in the flue pipe must be
drained away from the boiler via the condensate drain
on the condensate pan.
CAUTION: Disruption of operation due to high wind.
If no T-piece or 90° elbow is fitted on the end of flue pipe,
high winds may cause the boiler to shut down.
▶ Always make sure that there is a T-piece or a 90°
elbow fitted depending on the design of the flue
system.
▶ Use only a T-piece or 90° elbow (Category IV) made by
the selected flue system manufacturer.
With regard to possible restrictions and inspections for
flue systems, consult the local building and fire safety
authorities. Observe the national regulations.
In the Commonwealth of Massachusetts the
requirements about carbon monoxide detectors must be
followed.
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Installing the boiler
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