EN 656:1999/A1:2006
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
GAS-FIRED CENTRAL HEATING BOILERS - TYPE B BOILERS OF NOMINAL HEAT INPUT EXCEEDING 70 KW BUT NOT EXCEEDING 300 KW
23-07-2013
12-01-2013
Foreword
1 Scope
2 Normative references
3 Definitions
3.1 Combustible gases
3.2 Constituent parts of the boiler
3.3 Operation of the boiler
3.4 Country of destination
4 Classification of boilers
4.1 Gases and categories
4.2 Classification according to the mode of
evacuation of the combustion products
4.3 Type of technologies
5 Constructional requirements
5.1 General
5.2 Conversion to different gases
5.3 Materials and method of construction
5.4 Design
5.5 Use and servicing
5.6 Connections to the gas and water pipes
5.7 Soundness
5.8 Supply of combustion air and the evacuation of
the combustion products
5.9 Checking the state of operation
5.10 Drainage
5.11 Electrical equipment
5.12 Operational safety in the event of failure of
the auxiliary energy
5.13 Adjusting, control and safety devices
5.14 Burners
5.15 Pressure test points
5.16 Chemical composition of the condensate for
low-temperature boilers
6 Operational requirements
6.1 General
6.2 Soundness
6.3 Nominal, maximum and minimum heat inputs, and
nominal output
6.4 Safety of operation
6.5 Adjusting, control and safety devices
6.6 Combustion
6.7 Useful efficiencies
6.8 Criteria for condensation in the flue for
standard boilers
6.9 Resistance of the materials to pressure
6.10 Hydraulic resistance
6.11 Combustion air and flue dampers
6.12 Condensation in a standard boiler
7 Test methods
7.1 General
7.2 Soundness
7.3 Nominal, maximum and minimum heat inputs and
nominal output
7.4 Safety of operation
7.5 Adjusting, control and safety devices
7.6 Combustion
7.7 Useful efficiencies
7.8 Criteria for condensation in the flue
7.9 Resistance of materials to pressure
7.10 Hydraulic resistance
7.11 Combustion air and flue dampers
7.12 Condensation in a standard boiler
8 Marking and instructions
8.1 Marking of the boiler
8.2 Instructions
Annex A (informative) National situations
A.1 - Categories marked in the various countries
A.2 - Special categories marketed nationally or locally
A.3 - Gas groups distributed locally
A.4 - Boiler supply pressures
A.5 - Gas connections in common use in the various
countries
Annex B (normative) Special national conditions
Annex C (informative) A-deviations
Annex D (informative) Practical method of calibrating the
test rig to enable the heat loss D[p]
to be determined
Annex E (informative) Main symbols and abbreviations used
Annex F (informative) Compilation of test conditions
Annex G (informative) Valving
G.1 - General
G.2 - Boilers with permanent ignition burner or
alternating ignition burner or leakage control
device or with pre-purge
G.3 - Boilers without permanent ignition burner or
alternating ignition burner, without leakage
control device and without prepurge
Annex H (informative) Determination of the heat losses from
the test rig of the indirect method
and the contributions of the
circulating pump of the test rig
Annex J (informative) Means of determining the ignition time
at full rate
Annex K (informative) Example of calculation of the weighting
factors for a boiler with several rates
K.1 - Apportioning of varrho[pi] = 20%
K.2 - Apportioning of varrho[pi] = 40%
K.3 - Apportioning of varrho[pi] = 60%
K.4 - Apportioning of varrho[pi] = 70%
K.5 - Total apportioning
Annex L (informative) Calculation of conversions of NO[x]
Annex ZA (informative) Clauses of this European standard
addressing requirements or provisions
of EU Directives
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