Standard
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AS 4552-2005
[Available Superseded]Gas fired water heaters for hot water supply and/or central heating
These requirements apply to gas water heaters and central heating boilers with natural draught or fan assisted combustion systems, intended for use with natural gas, town gas, liquefied petroleum gas (LPG) and tempered liquefied petroleum gas (TLP) with gas consumptions not exceeding 500 MJ/h.
Published: 08/12/2005
Pages: 182
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and definitions
1.1 Scope
1.2 Definitions
2 Design and construction
2.1 General
2.1.1 Requirements applicable to all types of water heaters and central heating boilers
2.1.1.1 Preliminary specification
2.1.1.2 Physical inspection
2.1.1.3 Certification of safety components
2.1.1.4 Programmable electronic systems
2.1.1.5 Manual shut off gas valves
2.1.1.6 Classification of safety shut off valves
2.1.1.7 Pressure vessels
2.1.1.8 Compliance of electrical components
2.1.1.9 Power failure
2.1.1.10 Thermostats
2.1.1.11 Sharp edges
2.1.1.12 Handles and knobs
2.1.1.13 Continuity of satisfactory operation
2.1.1.14 Insulation
2.1.1.15 Covers on cold water feed tanks
2.1.1.16 Protection of vitreous enamel
2.1.1.17 Means of support
2.1.1.18 Compliance in alternative forms
2.1.1.19 Means of ignition for outdoor or room sealed appliances
2.1.1.20 Locking means for adjusting devices
2.1.1.21 Alteration of programmed ignition
2.1.1.22 Means for gas pressure measurement
2.1.1.23 Design of appliance base
2.1.1.24 Provision for removal of condensate
2.1.2 Requirements applicable only to water heaters
2.1.2.1 Temperature setting markings
2.1.3 Requirements applicable only to central heating boilers
2.1.3.1 Venting of waterways
2.1.4 Requirements applicable only to combination appliances
2.1.4.1 Venting of central heating waterways
2.2 Materials
2.2.1 General
2.2.2 Materials containing asbestos
2.2.3 Materials in contact with gas
2.2.4 Zinc based alloys
2.2.5 Components required to be placed in a flame
2.2.6 Materials used in electrical construction
2.2.7 Protection of aluminium tubing
2.2.8 Construction of primary air controls
2.2.9 Thermal insulation
2.2.10 Compression fittings
2.3 Electrical systems
2.3.1 Connection to mains electrical supply
2.3.2 Access to electrical system
2.3.3 Connection of electrical components
2.3.4 Plug and socket connections
2.3.5 Protection against accidental contact
2.3.6 Protection of low voltage electrical components and wiring
2.3.7 Protection from weather conditions
2.3.8 Remote controls
2.4 Installation requirements
2.4.1 Fixing of gas inlet connection
2.4.2 Gas inlet connection thread
2.4.3 Access to connections
2.5 Maintenance requirements
2.5.1 Dismantling and replacement by the user
2.5.2 Insertion and removal of gas injectors
2.5.3 Assembly and attachment of handles, dials and pointers
2.5.4 Accessibility for adjustment
2.5.5 Accessibility for replacement
2.5.6 Screwed connections
2.5.7 Inaccessible nuts or bolts
2.5.8 Collection and removal of corrosion product
2.5.9 Provision for draining.
2.5.10 Drain valves
2.6 Pressure regulators
2.6.1 Provision of a pressure regulating device
2.6.2 Positioning of pressure regulators
2.7 Gas controls, safety shut off systems and relief devices
2.7.1 General
2.7.2 Safety shut off system
2.7.3 Accessibility by the user
2.7.4 Accidental change of settings of valves, dials and pointers
2.7.5 Interlock for combination controls
2.7.6 Indication of function
2.7.7 Provision of flame safeguard
2.7.8 Failure of pilot
2.7.9 Main burner automatic shut off valves
2.7.10 Relief valves for unvented appliances containing more than 1L of water
2.7.11 Relief devices for unvented appliances containing less than 1L of water
2.7.12 Over-temperature cut-out devices
2.7.13 Expansion relief valve for unvented heat exchangers
2.8 Combustion air supply and controls
2.8.1 Combustion air supply equipment
2.8.2 Combustion air flow proving interlock
2.8.3 Prevention of combustion air backflow
2.9 Ignition, pilots and main burners
2.9.1 Burners with remote manual ignition
2.9.2 Burners with direct manual ignition
2.9.3 Prevention of injury at ignition
2.9.4 Manually operated burners in an enclosed compartment
2.9.5 Burners interconnected by flues or passages
2.9.6 Means for turning off pilot gas supply
2.9.7 Viewing of flames
2.9.8 Proving of burner operation
2.9.9 Positive location of flash tubes
2.9.10 Support of pilots, igniters and flame sensing devices
2.9.11 Location of burner mixing tubes
2.9.12 Burner supports
2.9.13 Fixing of gas manifolds
2.9.14 Protection of ports and injectors
2.9.15 Restriction on gauze over primary air ports
2.9.16 Pilot gas filters
2.9.17 Aeration adjustment for universal LPG appliances
2.9.18 Ignition of automatically controlled burners
2.10 Flueing requirements
2.10.1 Flueing of indoor appliances
2.10.2 Draught diverter or barometric regulator for open flued appliances
2.10.3 Design of air entry and combustion product discharge
2.10.4 Design of flue connection
2.10.5 Engagement of secondary flue
2.10.6 Flue terminal and draught diverter construction
2.10.7 Flue terminal openings
2.10.8 Combustion products temperature limiter
2.10.9 Automatic flue damper devices
2.10.9.1 Installation of automatic flue damper devices
2.10.9.2 Provision for a continuous pilot
2.10.9.3 Automatic valves
2.10.9.4 Electrical requirements
2.10.9.5 Ignition safety interlock
2.10.9.6 Visual indication of damper position
2.10.9.7 Automatic valve safety interlock
2.10.9.8 Safe operation under interlock failure conditions
2.11 Markings
2.11.1 Markings on packaging
2.11.2 Gas type label
2.11.3 Gas type colour code
2.11.4 Identification of injectors
2.11.5 Marking of fans
2.11.6 Markings on appliances
2.11.7 Marking of doors and covers
2.11.8 Flue terminal marking
2.11.9 Marking of direction of movement of thermostats
2.11.10 Marking of ignition points, flash lighting tubes
2.11.11 Identification of connections
2.11.12 Relief valve warning notice
2.12 Instructions
2.12.1 Documents remaining with user
2.12.2 Installation instructions
2.12.3 Operating instructions
2.12.4 Servicing instructions
3 Preliminary tests - line gases
3.1 General
3.1.1 Test gases
3.1.2 Appliances designed for various flue configurations
3.2 Preparation for testing
3.2.1 Electrical safety requirements
3.2.2 Setting up appliance for testing
3.2.2.1 General
3.2.2.2 Appliances intended for provision of hydronic heating
3.2.3 Appliance gas regulators not to be removed during testing
3.2.4 Protection from accidental draughts
3.2.5 Prevention of gas rate variation
3.2.6 Pressure and gas volume test equipment
3.3 Gas leakage
3.3.1 Gas circuit soundness
3.3.2 Soundness at completion of testing
3.3.3 Control of bleed line gas
3.4 Gas consumption
3.4.1 Tolerance on determined gas consumption
3.4.2 Determined gas consumption of permanent pilots
3.5 Gas pressure regulators
3.5.1 Pressure regulator performance
3.6 Ignition and safety shut off systems
3.6.1 General
3.6.2 Burner systems without permanent pilots
3.6.2.1 General
3.6.2.2 Atmospheric burner systems without permanent pilots
3.6.2.2.1 Ignition cycles prior to lockout (no flame established)
3.6.2.2.2 Reignition cycles after flame failure
3.6.2.3 Forced and induced draught burner systems without permanent pilots
3.6.2.3.1 Pre-ignition purge
3.6.2.3.2 Ignition cycles prior to lockout
3.6.2.3.3 Reignition cycles after flame failure
4 Limit gas tests
4.1 General
4.2 CO/CO2 ratio limits for any independent burner—Overload
4.3 CO/CO2 ratio limits for permanent pilots—Overload
4.4 Flame characteristics at maximum and minimum limiting conditions
4.5 Burner ignition at maximum and minimum limiting conditions
4.6 Delayed ignition at maximum and minimum limiting conditions
4.7 Reignition at turndown under draught conditions
4.8 Noise of extinction
4.9 Burner stability when changing setting
4.10 Pilot ignition and stability at maximum and minimum limiting conditions
4.11 Effect of opening and closing doors at turndown condition
4.12 Unburnt gas release from burner system
4.13 Burner interference at ignition or during combustion
5 Performance tests - all appliances
5.1 General
5.2 Drain performance
5.3 Condensation
5.3.1 Control of flue gas condensate
5.3.2 Condensate—Interference with combustion
5.3.3 Blocked condensate drain
5.4 Combustion air supply
5.4.1 Proving of means of mechanical air supply
5.4.2 Burner shutdown following air supply failure
5.4.3 Obstruction of air inlets on flued appliances with fan assisted combustion systems
5.5 Response to electrical power variation or failure
5.6 Temperature hazards
5.6.1 Test conditions
5.6.2 Surrounding surfaces—Temperature limits
5.6.2.1 Floor, wall and overhead surfaces
5.6.3 Personal safety—Temperature limits
5.6.3.1 Surfaces intended to be handled
5.6.3.2 Surfaces likely to be accidentally touched
5.6.4 Appliance safety—Temperature limits
5.6.4.1 Bodies of gas valves, thermostats, etc
5.6.4.2 Components containing non-metallic diaphragms
5.6.4.3 Body of a clock or timer
5.6.4.4 Main gas and pilot lines susceptible to sulphide attack
5.6.4.5 Electric motor windings
5.6.4.6 Flexible hoses
5.6.4.7 Joints sealed with jointing materials
5.6.4.8 Electrical wiring
5.6.4.9 Glass components
5.6.4.10 Expansion vessel
5.7 Heat resistance
5.7.1 Resistance to temperatures—Overload conditions
5.7.2 Resistance to temperatures—Burners lit back
5.8 Endurance of components
5.8.1 Automatic gas valves
5.8.2 Automatic burner control systems
5.8.3 Control thermostat
5.8.4 Automatic flue damper device
5.9 Flue operation
5.9.1 Leakage or spillage of combustion products
5.9.2 Combustion products discharge safety device
5.9.3 Performance of combustion products temperature limiter
5.9.4 Performance with updraught, downdraught and blocked flue
5.9.4.1 Open flued appliances
5.9.4.2 Other indoor appliances except room sealed
5.9.5 Response to fan failure
5.9.6 Automatic flue damper devices
5.9.6.1 Operation under variable voltage
5.9.6.2 Flue damper failure
5.10 Outdoor appliances and Type 1 room sealed appliances
5.10.1 Appliances with fan assisted combustion systems
5.10.2 Sealing of room sealed appliances
5.10.3 Permanent pilot ignition under wind conditions
5.10.4 Permanent pilot stability under wind conditions
5.10.5 Main burner ignition under wind conditions
5.10.6 Flame safeguard operation under wind conditions
5.10.7 Appliance operation under wind conditions
5.10.8 Appliance safety under wind conditions
5.11 Type 2 room sealed appliances
5.11.1 Pressurized appliance ventilation duct
5.11.2 Appliance operation under draught conditions
5.12 Linting test
5.12.1 Appliance operation under linting conditions
5.13 Rain test
5.13.1 Outdoor appliances
5.13.2 Type 1 room sealed appliances
5.14 Strength
5.14.1 Bearing pressure of indoor floor mounted appliances
5.14.2 Strength of flue connection
5.15 Specifications
5.15.1 Appliance specification
6 Special requirements for water heaters
6.1 Manually operated instantaneous water heaters
6.2 Automatic instantaneous water heaters
6.3 Cold water feed tank overflow
6.4 Marking of cold water feed tank water levels
6.5 Energy label
6.6 Storage capacity tolerance for storage water heaters
6.7 Automatic control
6.7.1 Over-temperature cut-out device
6.7.2 Storage water heaters
6.7.3 Instantaneous water heaters without automatic outlet temperature control
6.7.4 Instantaneous water heaters with automatic outlet temperature control
6.8 Operation of relief device of unvented water heaters containing less than 1L of water
6.9 Thermal efficiency
6.9.1 Application date for thermal efficiency requirements
6.9.2 Storage water heaters
6.9.2.1 Maintenance gas consumption
6.9.2.2 Stratification
6.9.3 Automatic heat exchange water heaters
6.9.3.1 Stratification
6.9.4 Heat output
6.9.5 Instantaneous water heaters
6.9.5.1 Water heating capacity
6.10 Combustion products spillage device—Storage water heaters
6.11 Endurance
6.11.1 Hydrostatic strength requirements
6.11.2 Hydrostatic cycling requirements
6.11.3 Water operated automatic gas valves
6.12 Energy labelling
7 Special requirements for central heating boilers
7.1 Markings
7.2 Instructions
7.2.1 General
7.2.2 Installation instructions
7.3 Thermal efficiency
7.3.1 Minimum requirements
7.3.2 Heat output
7.4 Endurance
7.4.1 Hydrostatic strength requirements
7.5 Thermostats and water temperature limiting devices
7.5.1 General
7.5.1.1 Accuracy of thermostats
7.5.2 Control thermostat
7.5.2.1 General
7.5.2.2 Performance
7.5.3 Limit thermostat
7.5.3.1 General
7.5.3.2 Performance
7.5.4 Overheat cut-off device
7.5.5 Safety temperature limiter
7.5.6 Sensors
7.6 Expansion vessel and pressure gauge
8 Special requirements for combination appliances
8.1 Combination appliances
Appendix A
Appendix B
B1 M.O.T. 2.2.4 – 98 Zinc alloy test
B1.1 Scope
B1.2 Method
B1.3 Apparatus
B1.4 Procedure
B1.5 Result
B2 M.O.T. 2.7.6 and 2.11 – 90 Markings and labels
B2.1 Scope
B2.2 Method
B2.3 Apparatus
B2.4 Materials
B2.5 Procedure
B2.6 Result
B3 M.O.T. 3.3.1 – 01 Gas leakage
B3.1 Scope
B3.2 Method
B3.3 Apparatus
B3.4 Materials
B3.5 Preparation of apparatus
B3.6 Procedure
B3.7 Result
B4 M.O.T. 3.4.1/2 – 04 Gas consumption
B4.1 Scope
B4.2 Method
B4.3 Apparatus
B4.4 Materials
B4.5 Preparation of apparatus
B4.6 Procedure
B4.7 Result
B5 M.O.T. 3.5.1 – 04 Gas pressure regulator performance
B5.1 Scope
B5.2 Method
B5.3 Apparatus
B5.4 Materials
B5.5 Preparation of apparatus
B5.6 Procedure
B5.7 Result
B6 M.O.T. 3.6.1(a) (b) (e) – 04 Ignition—Aerated pilots
B6.1 Scope
B6.2 Method
B6.3 Apparatus
B6.4 Materials
B6.5 Preparation of apparatus
B6.6 Procedure
B6.7 Result
B7 M.O.T. 3.6.1(c) (e) – 04 Ignition of a burner protected by a flame safeguard system
B7.1 Scope
B7.2 Method
B7.3 Apparatus
B7.4 Materials
B7.5 Preparation of apparatus
B7.6 Procedure
B7.7 Result
B8 M.O.T. 3.6.1(f) – 04 Ignition—Opening of flame safeguard system
B8.1 Scope
B8.2 Method
B8.3 Apparatus
B8.4 Materials
B8.5 Preparation of apparatus
B8.6 Procedure
B8.7 Result
B9 M.O.T. 3.6.1(m) – 04 Operation of safety shut off system
B9.1 Scope
B9.2 Method
B9.3 Materials
B9.4 Apparatus
B9.5 Preparation of apparatus
B9.6 Procedure
B9.7 Result
B10 M.O.T. 3.6.2.1(b)(iv) – 04 Start flame establishment period—Delayed ignition tests
B10.1 Scope
B10.2 Method
B10.3 Apparatus
B10.4 Materials
B10.5 Preparation of apparatus
B10.6 Procedure
B10.7 Result
B11 M.O.T. 3.6.2.2 – 04 Automatic burner ignition systems for atmospheric burners
B11.1 Scope
B11.2 Method
B11.3 Apparatus
B11.4 Materials
B11.5 Preparation of apparatus
B11.6 Procedure
B11.7 Result
B12 M.O.T. 3.6.2.3 – 04 Automatic burner ignition systems for forced and induced draught burners
B12.1 Scope
B12.2 Method
B12.3 Apparatus
B12.4 Materials
B12.5 Preparation of apparatus
B12.6 Procedure
B12.7 Result
B13 M.O.T. 4.2 – 04 Determination of CO/CO2 ratio of combustion products
B13.1 Scope
B13.2 Method
B13.3 Apparatus
B13.4 Materials
B13.5 Preparation of apparatus
B13.6 Procedure
B13.7 Result
B14 M.O.T. 4.3 – 04 Determination of CO/CO2 ratio of combustion products—Permanent pilots
B14.1 Scope
B14.2 Method
B14.3 Apparatus
B14.4 Materials
B14.5 Preparation of apparatus
B14.6 Procedure
B14.7 Result
B15 M.O.T. 4.4 – 04 Flame abnormality
B15.1 Scope
B15.2 Method
B15.3 Apparatus
B15.4 Materials
B15.5 Preparation of apparatus
B15.6 Procedure
B15.7 Result
B16 M.O.T 4.5 – 04 Ignition tests
B16.1 Scope
B16.2 Method
B16.3 Apparatus
B16.4 Materials
B16.5 Preparation of apparatus
B16.6 Procedure
B16.7 Result
B17 M.O.T. 4.6 – 04 Delayed ignition test
B17.1 Scope
B17.2 Method
B17.3 Apparatus
B17.4 Materials
B17.5 Preparation of apparatus
B17.6 Procedure
B17.7 Result
B18 M.O.T. 4.7 – 90 Flame stability to draught
B18.1 Scope
B18.2 Method
B18.3 Apparatus
B18.4 Materials
B18.5 Preparation of apparatus
B18.6 Procedure
B18.7 Result
B19 M.O.T. 4.10 – 04 Pilot flames—Ignition and stability
B19.1 Scope
B19.2 Method
B19.3 Apparatus
B19.4 Materials
B19.5 Preparation of apparatus
B19.6 Procedure
B19.7 Result
B20 M.O.T. 4.11 – 04 Effect of appliance door operation on burner stability
B20.1 Scope
B20.2 Method
B20.3 Apparatus
B20.4 Materials
B20.5 Preparation of apparatus
B20.6 Procedure
B20.7 Result
B21 M.O.T. 4.12 – 04 Burner operation—Unburnt gas spillage from burner system
B21.1 Scope
B21.2 Method
B21.3 Apparatus
B21.4 Materials
B21.5 Preparation of apparatus
B21.6 Procedure
B21.7 Result
B22 M.O.T. 5.2 – 04 Drain performance
B22.1 Scope
B22.2 Method
B22.3 Apparatus
B22.4 Materials
B22.5 Procedure
B22.6 Result
B23 M.O.T. 5.3.3 – 04 Blocked condensate drain
B23.1 Scope
B23.2 Method
B23.3 Apparatus
B23.4 Materials
B23.5 Preparation of apparatus
B23.6 Procedure
B23.7 Result
B24 M.O.T. 5.4.3 – 04 Combustion performance on progressive air supply restriction
B24.1 Scope
B24.2 Method
B24.3 Apparatus
B24.4 Materials
B24.5 Preparation of apparatus
B24.6 Procedure
B24.7 Result
B25 M.O.T. 5.5, 5.9.5 and 2.3.1 – 04 Safe performance with electricity supply variation
B25.1 Scope
B25.2 Method
B25.3 Apparatus
B25.4 Materials
B25.5 Preparation of apparatus
B25.6 Procedure
B25.7 Result
B26 M.O.T. 5.6 – 04 Temperature hazards
B26.1 Scope
B26.2 Method
B26.3 Apparatus
B26.4 Materials
B26.5 Preparation of apparatus
B26.6 Procedure
B26.7 Result
B27 M.O.T. 5.6.4.5 – 04 Temperature hazards—Electric motors
B27.1 Scope
B27.2 Method
B27.3 Apparatus
B27.4 Materials
B27.5 Preparation of apparatus
B27.6 Procedure
B27.7 Calculations
B27.8 Result
B28 M.O.T. 5.7.1 – 04 Heat resistance
B28.1 Scope
B28.2 Method
B28.3 Apparatus
B28.4 Materials
B28.5 Preparation of apparatus
B28.6 Procedure
B28.7 Result
B29 M.O.T. 5.7.2 – 04 Heat resistance—Light back condition
B29.1 Scope
B29.2 Method
B29.3 Apparatus
B29.4 Materials
B29.5 Preparation of apparatus
B29.6 Result
B30 M.O.T. 5.9.1 – 04 Flue operation—Spillage test
B30.1 Scope
B30.2 Method
B30.3 Apparatus
B30.4 Materials
B30.5 Preparation of apparatus
B30.6 Procedure
B30.7 Result
B31 M.O.T. 5.9.2 – 04 Spillage monitoring system test for appliances with a combustion products discharge safety device
B31.1 Scope
B31.2 Method
B31.3 Apparatus
B31.4 Materials
B31.5 Preparation of apparatus
B31.6 Procedure
B31.6.1 Nuisance shutdown
B31.6.2 Test with complete blockage (shutdown times)
B31.7 Result
B32 M.O.T. 5.9.3 – 04 Performance of combustion products temperature limiter
B32.1 Scope
B32.2 Method
B32.3 Materials
B32.4 Apparatus
B32.5 Preparation of apparatus
B32.6 Procedure
B32.7 Result
B33 M.O.T. 5.9.4 – 04 Determination of CO/CO2 ratio of combustion products under conditions of flue blockage, downdraught or updraught
B33.1 Scope
B33.2 Method
B33.3 Apparatus
B33.4 Materials
B33.5 Preparation of apparatus
B33.6 Procedure
B33.7 Result
B34 M.O.T. 5.10 – 04 Outdoor and Type 1 room sealed appliances
B34.1 Scope
B34.2 Method
B34.3 Apparatus
B34.4 Materials
B34.5 Preparation of apparatus
B34.6 Procedure
B34.7 Result
B35 M.O.T. 5.11.1 – 04 Type 2 room sealed appliances—Pressure differential
B35.1 Scope
B35.2 Method
B35.3 Apparatus
B35.4 Materials
B35.5 Preparation of apparatus
B35.6 Procedure
B35.7 Result
B36 M.O.T. 5.11.2 – 04 Type 2 room sealed apliances—Draught applied to flue terminal or air inlet
B36.1 Scope
B36.2 Method
B36.3 Apparatus
B36.4 Materials
B36.5 Preparation of apparatus
B36.6 Procedure
B36.7 Result
B37 M.O.T. 5.12.1/2 – 04 Linting test
B37.1 Scope
B37.2 Method
B37.3 Apparatus
B37.4 Materials
B37.5 Preparation of apparatus
B37.6 Procedure
B37.7 Result
B38 M.O.T. 5.13.1/2 – 04 Rain resistance of outdoor appliances and flue terminals of Type 1 room sealed appliances
B38.1 Scope
B38.2 Method
B38.3 Apparatus
B38.4 Materials
B38.5 Preparation of apparatus
B38.6 Procedure
B38.7 Result
B39 M.O.T. 5.14.1 – 04 Floor loading test
B39.1 Scope
B39.2 Method
B39.3 Apparatus
B39.4 Procedure
B39.5 Result
B40 M.O.T. 5.14.2 – 04 Flue connection—Load test
B40.1 Scope
B40.2 Method
B40.3 Apparatus
B40.4 Preparation of apparatus
B40.5 Procedure
B40.6 Result
B41 M.O.T. 6.6 – 04 Capacity of storage tank
B41.1 Scope
B41.2 Method
B41.3 Apparatus
B41.4 Materials
B41.5 Preparation of apparatus
B41.6 Procedure
B41.7 Result
B42 M.O.T. 6.7.1 – 04 Operation of over-temperature cut-out device
B42.1 Scope
B42.2 Method
B42.3 Apparatus
B42.4 Materials
B42.5 Preparation of apparatus
B42.6 Procedure
B42.7 Result
B43 M.O.T. 6.7.2(a) (b) (c) – 04 Automatic control of storage water heaters
B43.1 Scope
B43.2 Method
B43.3 Apparatus
B43.4 Materials
B43.5 Preparation of apparatus
B43.6 Procedure
B43.7 Result
B44 M.O.T. 6.7.3(a) – 04 Minimum operating pressure of automatic instantaneous water heaters
B44.1 Scope
B44.2 Method
B44.3 Apparatus
B44.4 Materials
B44.5 Preparation of apparatus
B44.6 Procedure
B44.7 Result
B45 M.O.T. 6.7.3(b) – 04 Water temperature rise of instantaneous water heaters
B45.1 Scope
B45.2 Method
B45.3 Apparatus
B45.4 Materials
B45.5 Preparation of apparatus
B45.6 Procedure
B45.7 Result
B46 M.O.T. 6.7.3(c) – 04 Gas consumption of automatic instantaneous water heaters
B46.1 Scope
B46.2 Method
B46.3 Apparatus
B46.4 Materials
B46.5 Preparation of apparatus
B46.6 Procedure
B46.7 Result
B47 M.O.T. 6.7.4(a) – 04 Minimum operating pressure of instantaneous water heaters with automatic outlet temperature control
B47.1 Scope
B47.2 Method
B47.3 Apparatus
B47.4 Materials
B47.5 Preparation of apparatus
B47.6 Procedure
B47.7 Result
B48 M.O.T. 6.7.4(b) – 04 Water temperature rise of instantaneous water heaters with automatic outlet temperature control
B48.1 Scope
B48.2 Method
B48.3 Apparatus
B48.4 Materials
B48.5 Preparation of apparatus
B48.6 Procedure
B48.7 Result
B49 M.O.T. 6.7.4(c) – 04 Water temperature control of instantaneous water heaters with automatic outlet temperature control
B49.1 Scope
B49.2 Method
B49.3 Apparatus
B49.4 Materials
B49.5 Preparation of apparatus
B49.6 Procedure
B49.7 Result
B50 M.O.T. 6.8 – 04 Operation of relief device of unvented water heaters containing less than 1L of water
B50.1 Scope
B50.2 Method
B50.3 Apparatus
B50.4 Materials
B50.5 Preparation of apparatus
B50.6 Procedure
B50.7 Result
B51 M.O.T. 6.9.1(Storage), 6.9.5 and 6.12 – 04 Thermal efficiency, heat output and energy labelling of storage water heaters
B51.1 Scope
B51.2 Method
B51.3 Apparatus
B51.4 Materials
B51.5 Preparation of apparatus
B51.6 Procedure
B51.7 Calculations
B51.7.1 Thermal efficiency
B51.7.2 Heat output
B51.7.3 Energy labelling
B51.7.4 Annual energy consumption (AE)
B51.7.5 Gas saving (QS) %
B51.7.6 Star allocation and red band shading
B51.8 Result
B52 M.O.T. 6.9.1(Instantaneous), 6.9.5, 6.9.6 and 6.12 – 04 Thermal efficiency, heat output, water heating capacity and energy labelling of instantaneous water heaters and circulators
B52.1 Scope
B52.2 Method
B52.3 Apparatus
B52.4 Materials
B52.5 Preparation of apparatus
B52.6 Procedure
B52.6.1 Thermal efficiency
B52.6.2 Water heating capacity
B52.7 Calculations
B52.7.1 Thermal efficiency
B52.7.2 Heat output
B52.7.3 Energy labelling
B52.7.4 Start-up heat capacity
B52.7.5 Electrical energy consumption (Qe)
B52.7.6 Annual energy consumption (AE)
B52.7.7 Energy saving (QS) %
B52.7.8 Star allocation and red band shading
B52.8 Result
B53 M.O.T. 6.9.2 – 04 Maintenance gas consumption (MJ/h) of storage water heaters
B53.1 Scope
B53.2 Method
B53.3 Apparatus
B53.4 Materials
B53.5 Preparation of apparatus
B53.6 Procedure
B53.7 Calculations
B53.8 Result
B54 M.O.T. 6.9.3 – 04 Stratification test—Storage water heaters
B54.1 Scope
B54.2 Method
B54.3 Apparatus
B54.4 Materials
B54.5 Preparation of apparatus
B54.6 Procedure
B54.7 Result
B55 M.O.T. 6.9.4 – 04 Stratification test—Automatic heat exchange water heaters
B55.1 Scope
B55.2 Method
B55.3 Apparatus
B55.4 Materials
B55.5 Preparation of apparatus
B55.6 Procedure
B55.7 Result
B56 M.O.T. 6.10 – 04 Safety shutdown when combustion products spill from appliance
B56.1 Scope
B56.2 Method
B56.3 Materials
B56.4 Apparatus
B56.5 Preparation of apparatus
B56.6 Procedure
B56.7 Result
B57 M.O.T. 6.11.1 – 04 Hydrostatic strength test
B57.1 Scope
B57.2 Method
B57.3 Apparatus
B57.4 Materials
B57.5 Preparation of apparatus
B57.6 Procedure
B57.7 Result
B58 M.O.T. 6.11.2(A) – 04 Hydrostatic cycling test—Instantaneous water heaters
B58.1 Scope
B58.2 Method
B58.3 Apparatus
B58.4 Materials
B58.5 Preparation of apparatus
B58.6 Procedure
B58.7 Result
B59 M.O.T. 6.11.2(B) – 04 Hydrostatic cycling test—Circulators and storage water heaters
B59.1 Scope
B59.2 Method
B59.3 Apparatus
B59.4 Materials
B59.5 Preparation of apparatus
B59.6 Procedure
B59.7 Result
B60 M.O.T. 6.11.3 – 04 Endurance—Water operated gas valves
B60.1 Scope
B60.2 Method
B60.3 Materials
B60.4 Apparatus
B60.5 Preparation of apparatus
B60.6 Procedure
B60.7 Result
B61 M.O.T. 7.3.1 and 7.3.2 – 04 Thermal efficiency and heat output of central heating boilers and central heating function of combination appliances.
B61.1 Scope
B61.2 Method
B61.3 Apparatus
B61.4 Materials
B61.5 Preparation of apparatus
B61.6 Procedure
B61.7 Calculations
B61.7.1 Thermal efficiency
B61.7.2 Heat output
B61.8 Result
B62 M.O.T. 7.4.1 – 04 Endurance—Hydrostatic strength requirements—Central heating circuit
B62.1 Scope
B62.2 Method
B62.3 Materials
B62.4 Apparatus
B62.5 Preparation of apparatus
B62.6 Procedure
B62.7 Result
B63 M.O.T. 7.5.2.2 – 04 Control thermostat performance
B63.1 Scope
B63.2 Method
B63.3 Materials
B63.4 Apparatus
B63.5 Preparation of apparatus
B63.6 Procedure
B63.6.1 For on/off thermostats
B63.6.2 For modulating thermostats
B63.7 Result
B64 M.O.T. 7.5.3.2 and 7.5.4 (b) – 04 Water temperature safety limiting devices
B64.1 Scope
B64.2 Method
B64.3 Materials
B64.4 Apparatus
B64.5 Preparation of apparatus
B64.6 Procedure
B64.7 Result
B65 M.O.T. 7.5.5(b) – 04 Operation of safety temperature limiter
B65.1 Scope
B65.2 Method
B65.3 Materials
B65.4 Apparatus
B65.5 Preparation of apparatus
B65.6 Procedure
B65.7 Result
Appendix C
C1 Specifications
C2 General
C2.1 Type
C2.2 Model designation
C2.3 Rated capacity
C2.4 Maximum working water pressure
C2.5 Minimum working water pressure (where applicable)
C2.6 Relief pressure (where applicable)
C2.7 Relief temperature (where applicable)
C2.8 For applicable burners, nominal gas consumption in MJ/h (NHGC), injector diameter in mm, burner test point pressure in kPa, for each gas type.
C2.9 Electrical requirements
C2.10 Overall dimensions
C2.11 Dry weight
C2.12 Markings
C3 Construction
C4 Gas system
C4.1 Gas piping system
C4.2 Gas inlet connection
C4.3 Piping
C4.4 Regulator
C4.5 Gas control
C4.6 Burner
C4.7 Pilot
C4.8 Pressure test point
C5 Water system
C5.1 Water connections
C5.2 Hot water storage tank (where applicable)
C5.3 Drain valve (where applicable)
C5.4 Heat exchanger
C5.5 Water operated gas valve (where applicable)
C5.6 Water filter
C5.7 Temperature relief
C5.8 Pressure relief
Appendix D
Appendix E
Appendix F
Cited references in this standard
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