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BS EN 303-3:1999:2006 Edition

BS EN 303-3:1999:2006 Edition

$167.15

Heating boilers – Gas-fired central heating boilers. Assembly comprising a boiler body and a forced draught burner

Published By Publication Date Number of Pages
BSI 2006 40
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This European Standard specifies the requirements and test methods for the construction, the safety and the rational energy usage of an assembly made up of a boiler body complying with EN 303-11) and a forced draught gas burner complying with EN 676, using combustible gases, hereafter referred to as a ā€œboilerā€.

#This European Standard applies to standard boilers and low-temperature boilers with a nominal heat output not exceeding 1 000 kW and with a water temperature at normal operation not exceeding 105 Ā°C.$

This European Standard does not contain all the necessary requirements for:

  • assemblies designed as units;

  • condensing boilers;

  • boilers intended to be installed in the open;

  • boilers permanently fitted with more than one flue outlet;

  • boilers fitted with a draught diverter;

  • boilers intended to be connected to a common flue having mechanical extraction.

This European Standard does not apply to living-space dedicated boilers (see 3.6).

If the boiler body has already been tested with a liquid fuel burner, in accordance with EN 303-1, EN 303-2 and EN 304, only the tests described in Annex G need to be performed.

In the case of a range of boilers, see Annex F.

Text deleted

This European Standard only covers type testing.

PDF Catalog

PDF Pages PDF Title
1 BRITISH STANDARD
2 National foreword
4 Foreword
Foreword to amendment A2
5 Contents
7 1 Scope
2 Normative references
8 3 Definitions
3.1 gas rates
volumetric rate
mass rate
heat input
nominal heat input
3.3 outputs
useful output
nominal output
useful efficiency
nominal voltage
9 boiler to be installed in the living space
unit
condensate
standard boiler
low-temperature boiler
4 Assembly requirements
4.1 General principles
4.2 Materials
4.3 Combustion products evacuation ducts
10 4.4 Condensate discharge for low-temperature boilers
5 Operational requirements
5.1 General
5.2 Heat inputs
5.3 Safety of operation
11 5.4 Useful efficiencies
Useful efficiency requirement at maximum nominal heat input
Useful efficiency requirement at part load
12 5.5 Required draught and combustion products circuit resistance
5.6 Condensation
5.7 Resistance of the materials to pressure
6 Test methods
6.1 General
14 Adjusting air factor
15 6.2 Heat inputs
16 6.3 Safety of operation
17 (CO2)N
6.4 Useful efficiencies
21 Symbols and quantities needed to calculate the efficiency at part load
6.5 Required draught and combustion products circuit resistance
22 Calculation of the useful part load efficiency
23 7 Instructions
Test rig with direct recirculation (see 6.1.2.3, 6.4.2.2.1, 6.4.2.2.2 and
24 Test rig with heat exchanger
25 Test configuration for determining floor temperature
26 Thermocouple configuration for measuring surface temperatures on test floor
27 Sampling probe for flue diameters greater than DN 100
28 Sampling probe for flue diameters not greater than DN 100
29 Requirements for standard gas boilers
30 Requirements for boilers operating with negative pressure
Maximum combustion products circuit pressure drop for boilers operating with positive pressure
31 Test installation to determine the heat emissions of the boiler when the burner is off
32 (informative) Diameters of combustion products evacuation ducts marketed in the various countries
(informative) Diameters of combustion products evacuation ducts marketed in the various countries
Diameters of combustion products evacuation ducts marketed
(informative) Practical method of calibrating the test rig to enable determination of heat loss
(informative) Practical method of calibrating the test rig to enable determination of heat loss
33 (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
(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
(informative) Determination of the ignition time at full rate
(informative) Determination of the ignition time at full rate
34 (normative) Assembly criteria
(normative) Assembly criteria
35 Minimum dimensions of the combustion chamber
(informative) Ranges of boilers
(informative) Ranges of boilers
36 (normative) Case of a boiler body which has already been tested with a liquid fuel burner in accordance with EN 303-1, EN 303-2 and EN 304
(normative) Case of a boiler body which has already been tested with a liquid fuel burner in accordance with EN 303-1, EN 303-2 and EN 304
37 (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives
(informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives
38 (continued)
39 (continued)
Table identifying conformity with the relevant clauses of the Efficiency Directive

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BS EN 303-3:1999
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