Installing The Boiler - Buderus Logano plus GB312 Installation And Service Instructions Manual

6

Installing the boiler

Overall air supply within the building
Make sure that the installation room has two permanent air vents that
are connected to one or more other rooms. When calculating the cross-
sectional areas of the vent apertures, the total burner output of all gas-
fired appliances in the connected rooms must be taken into account.
Each vent must have a minimum cross-section of one square inch per
1000 Btu/h of the total burner output of all gas-fired appliances inside
the connected rooms. Make sure that the cross-sectional area of each
vent is at least 100 square inches. One of the vents must be no more
than 12" from the ceiling and the other no more than 12" from the floor
of the installation room, measured from the outer edge of the vent
opening. The smallest dimension of all inlet and outlet vents must be not
less than 3".
All air from outdoors
Make sure that the installation room has two permanent air vents, one of
which must not be more than 12" from the ceiling and the other not more
than 12" from the floor of the installation room, measured from the outer
edge of the vent opening. The vents must be connected either directly or
via air ducts to the outside or to rooms that have an unobstructed
connection to the open air (crawl space or ventilated attic). The smallest
dimension of all inlet and outlet vents must be not less than 3".
• 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 a ventilated attic with
vertical ventilation ducts, each vent aperture must have a minimum
cross-section of one square inch per 4000 Btu/hr of the total burner
output of all gas-fired appliances inside the closed room. The attic
must be ventilated at both ends of the house.
• If there is a connection to the outside through horizontal ventilation
ducts, each vent aperture must have a minimum cross-section of one
square inch per 2000 Btu/hr of the total burner output of all gas-fired
appliances inside the closed room. The duct cross sectional area
must not be smaller than the free area of the inlet.
• If there is a connection to the outside through a ventilated attic and
ventilated crawl space, each opening must have a minimum cross-
section of one square inch per 4000 Btu/h of the total burner output
of all gas-fired appliances inside the closed room.If there is a
connection to the outside through a ventilated attic and ventilated
crawl space, each opening must have a minimum cross-section of
one square inch per 4000 Btu/h of the total burner output of all gas-
fired appliances inside the closed room. The attic must be ventilated
at both ends of the house.
16
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
• Providing the fuel supply
• Electrical connections
General notes on installing the flue and air supply system
The boiler requires a venting 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 7 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, CPVC pipe Schedule 80 ASTM D1784,
Charlotte
PVC pipe Schedule 40 ASTM D1784
Table 8 Recommended systems for the USA
The use of cellular core PVC, CPVC and Radel as venting material is
prohibited.
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 9 Recommended flue systems for Canada
Flue gas/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 19) 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 – 6 720 806 273 (2013/01)