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AS 4554-2005


Gas laundry dryers

Specifies the uniform minimum requirements for manufacturers, designers, regulatory authorities, testing laboratories and similar organizations for the safety, performance and use of gas laundry dryers intended for use with natural gas, town gas, tempered liquefied petroleum gas and liquefied petroleum gas.
Published: 19/12/2005
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Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and definitions
1.1 Scope
1.2 Definitions
2 Design and construction
2.1 General
2.1.1 Preliminary specification
2.1.2 Physical inspection
2.1.3 Power failure
2.1.4 Certification of safety components
2.1.5 Programmable electronic systems
2.1.6 Manual shut off valves
2.1.7 Classification of safety valves
2.1.8 Provision of pressure regulator
2.1.9 Means for gas pressure measurement
2.1.10 Safety shut off system
2.1.11 Bypass for thermostatically controlled burners
2.1.12 Gas filters
2.1.13 Protection of ports and injectors
2.1.14 Aeration adjustment for Universal LPG appliances
2.1.15 Sealing of gas consumption adjusting devices
2.1.16 Provision to shut off main burner
2.1.17 Door catch design
2.1.18 Electrically operated automatic valves
2.1.19 Reignition after power failure
2.1.20 Protection of components from water
2.1.21 Flash tubes
2.1.22 Ignition of room sealed appliances
2.1.23 Manual operation of automatic valves
2.1.24 Resistance to corrosion
2.1.25 Damage of clothes, sharp edges
2.1.26 Means of exhaust discharge
2.1.27 Compliance in alternative forms
2.1.28 Static laundry dryers Prevention of damage to clothes Openings in protective grid Hanging rods
2.1.29 Rotary laundry dryers Interlock of drum rotation and door Electric motors Automatic ignition Exhaust connection Lint removal Provision of lint trap Means to clean lint trap Door fit when closed Adjustment of fan belt tension Provision of thermostat Provision of over temperature cut out
2.2 Strength and stability
2.2.1 Adequacy of means of support
2.2.2 Support of components
2.2.3 Location of mixing tubes
2.2.4 Burner supports
2.2.5 Gas manifolds
2.3 Durability
2.3.1 Continuation of satisfactory operation
2.3.2 Positioning of regulators
2.3.3 Protection of electric lamp
2.3.4 Components required to be placed in a flame
2.3.5 Restriction on gauze over primary air ports
2.3.6 Protection of vitreous enamel
2.4 Electrical requirements
2.4.1 Requirements for electrical components and their installation
2.4.2 Connection of electrical components
2.4.3 Accessibility to electrical components
2.4.4 Protection of low voltage electrical components and wiring
2.4.5 Plug and socket connections
2.4.6 Protection against accidental contact
2.5 Materials
2.5.1 Suitability of materials and finishes
2.5.2 Materials in contact with gas
2.5.3 Zinc based alloys
2.5.4 Thermal insulation
2.5.5 Suitability of materials used in electrical construction
2.5.6 Materials used in gas appliances
2.5.7 Protection of aluminium tubing
2.6 Installation requirements
2.6.1 Fixing of gas inlet connection
2.6.2 Gas inlet connection thread
2.6.3 Access to connections
2.6.4 Design of air entry and combustion product discharge
2.6.5 Design of flue connection
2.6.6 Flue adaptors
2.6.7 Flue terminal and draught diverter construction
2.7 Maintenance requirements
2.7.1 Accessibility for adjustment
2.7.2 Accessibility for replacement
2.7.3 Screwed connections
2.7.4 Inaccessible nuts or bolts
2.7.5 Insertion and removal of gas injectors
2.7.6 Compression fittings
2.7.7 Design of valve handles, movable dials and pointers
2.7.8 Security of valve handles, movable dials and pointers
2.7.9 Viewing of flames
2.8 Design for use
2.8.1 Accessibility by the user
2.8.2 Accidental change of setting
2.8.3 Adjusting devices, locking arrangements
2.8.4 Burners with remote manual ignition
2.8.5 Burners with direct manual ignition
2.8.6 Prevention of injury at ignition
2.8.7 Proving of pilot ignition
2.8.8 Manually operated burners in an enclosed compartment
2.8.9 Burners interconnected by flues or passages
2.8.10 Dismantling and replacement by the user
2.8.11 Sharp edges
2.8.12 Handles and knobs
2.9 Markings
2.9.1 Permanent markings on appliances
2.9.2 Indication of function of gas valves
2.9.3 Identification of gas valves
2.9.4 Gas type
2.9.5 Gas type indication
2.9.6 Identification of injectors
2.9.7 Temporary markings on appliances
2.9.8 Packaging
2.9.9 Room sealed appliance or a power flued appliance
2.10 Instructions
2.10.1 Installation Instructions to be supplied with the appliance
2.10.2 Servicing
2.10.3 Operating Instructions to be supplied with the appliance Incorrect lighting and shutdown procedures Appliances without a permanent flue
3 Preliminary tests – line gases
3.1 General requirements
3.1.1 Test gases
3.2 Preparation for testing
3.2.1 Electrical safety requirements
3.2.2 Setting up appliance for testing
3.2.3 Appliance regulator not to be removed during testing
3.2.4 Protection from accidental draughts
3.2.5 Provision of gas rate variation
3.2.6 Gas pressure and gas volume test equipment
3.3 Gas leakage
3.3.1 Gas tightness
3.3.2 Gas tightness after testing
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 Requirements applicable to all Aerated pilots Ignition at reduced pilot rate Multi-port pilots Means of ignition other than permanent pilot Holding time for thermoelectric flame safeguard Flame safeguard system Flame travel at ignition Cessation of means of ignition Commencement of ignition after purge period Proving of start flame Safety shut off system self check Flame failure Flame establishment period for intermittent pilot Shut off time for flame safeguard system Proving of interrupted pilot Appliances equipped for exhaust duct connections
3.6.2 Automatic burner ignition systems—Additional requirements Atmospheric burners Start flame establishment period Gas flow rate at ignition Start flame proving period - nominal gas consumption exceeds that permitted in Clause Number of reignition cycles after flame failure Forced or induced draught burners Gas flow rate at ignition Start flame proving period - nominal gas consumption exceeds that permitted in Clause Number of reignition attempts after flame failure Pre-purge period
4 Limit gas tests
4.1 General
4.2 CO/CO2 Ratio limits for any independent burner—Overload
4.3 Flame characteristics at maximum and minimum limiting conditions
4.4 Burner ignition at maximum and minimum limiting conditions
4.5 Delayed ignition at maximum and minimum limiting conditions
4.6 Reignition at turndown under draught conditions
4.7 Noise of extinction
4.8 Burner stability when changing setting
4.9 Pilot ignition at maximum and minimum limiting conditions
4.10 Effect of opening or closing of appliance doors at turndown condition
4.11 Unburnt gas release from burner system
4.12 Burner interference at ignition or during combustion
4.13 Burner requirements when flue terminal is blocked
5 Performance requirements
5.1 Noise of operation
5.1.1 Acceptable noise level
5.2 Flue operation
5.2.1 Leakage or spillage of flue gas
5.2.2 Performance with updraught, downdraught and blocked flue
5.3 Condensation
5.3.1 Condensation interference with combustion
5.4 Combustion air supply and controls
5.4.1 Combustion air supply equipment
5.4.2 Safety shutdown—Inadequate air supply
5.4.3 Air flow proving device interlock
5.4.4 Means to ensure air does not pass back into the gas line
5.4.5 Automatically operated air control
5.5 Drying performance
5.5.1 All dryers Dryers provided with a timing device Clothes load temperature
5.5.2 Rotary laundry dryers Gas consumption per kg of water evaporated
5.5.3 Static laundry dryers Gas consumption per kg of water evaporated Time required to evaporate water
5.6 Temperature hazards
5.6.1 Test conditions
5.6.2 Temperature limits Surrounding surfaces Floor, wall, overhead and bench surfaces and surrounds Personal safety Surfaces intended to be handled Surfaces likely to be accidentally touched Appliance safety Bodies of gas valves Components containing non-metallic diaphragms Body of clock or timer Main gas and pilot lines susceptible to sulphide attack Electric motor windings Flexible hoses Joints sealed with jointing materials Electrical wiring Glass components Hot air discharge
5.7 Additional requirements for rotary laundry dryers
5.7.1 Failure of the blower, drum rotation, or both
5.7.2 Temperature limit controls
5.7.3 Over-temperature cut-out devices
5.7.4 CO/CO2 ratio—Lint screen blocked
5.8 Additional requirement for static laundry dryers
5.8.1 Protective grid
5.9 Heat resistance
5.9.1 Overload conditions
5.9.2 Burners light back
5.10 Strength and stability
5.10.1 General Appliance stability Strength of loading door Strength of drop down loading door
5.10.2 Static laundry dryers Damage to protective grid
5.11 Room sealed appliances—Flue operation
5.11.1 Power flued appliance
5.11.2 Pilot burner ignition under wind conditions
5.11.3 Pilot burner stability under wind conditions
5.11.4 Main burner ignition under wind conditions
5.11.5 Flame safeguard operation under wind conditions
5.11.6 CO/CO2 ratio under wind conditions
5.11.7 Sealing of balanced flue appliance
5.11.8 Power flued appliance—fan failure
5.12 Additional requirements for appliances without a permanent flue
5.12.1 CO concentration at nominal gas consumption
5.12.2 CO/CO2 ratio under linting conditions
Appendix A
Appendix B
B1 M.O.T. 2.5.3 – 98 Zinc alloy test
B1.1 Scope
B1.2 Method
B1.3 Apparatus
B1.4 Procedure
B1.5 Result
B2 M.O.T. 2.9 – 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 – 96 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 – 93 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 – 96 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. – 92 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. – 85 Ignition of a burner protected by a safety shut off 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. – 84 Ignition—Opening of safety shut off 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. – 85 Operation of safety shut off system
B9.1 Scope
B9.2 Method
B9.3 Apparatus
B9.4 Materials
B9.5 Preparation of apparatus
B9.6 Procedure
B9.7 Result
B10 M.O.T. – 77 Appliances with exhaust duct connection—Satisfactory burner ignition
B10.1 Scope
B10.2 Method
B10.3 Materials
B10.4 Apparatus
B10.5 Preparation of apparatus
B10.6 Procedure
B10.7 Result
B11 M.O.T. – 94 Start flame establishment period—Delayed ignition tests
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. – 01 Automatic burner ignition systems for atmospheric 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 – 02 Determination of CO/CO2 ratio in combustion products—Overload
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 – 73 Flame abnormality
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 – 83 Ignition tests
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. 4.5/2.8.8 – 86 Delayed ignition test
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 – 90 Flame stability to draught
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. 4.9 – 90 Pilot flames—Stability
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 – 90 Effect of appliance door operation on burner 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 – 92 Burner operation—Unburnt gas spillage from burner system
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. 4.13 – 84 Burner flame stability—Blocked flueway terminal
B21.1 Scope
B21.2 Method
B21.3 Apparatus
B21.4 Materials
B21.5 Preparation for test
B21.6 Procedure
B21.7 Result
B22 M.O.T. 5.2.1 – 94 Flue operation—Spillage test
B22.1 Scope
B22.2 Method
B22.3 Apparatus
B22.4 Materials
B22.5 Preparation of apparatus
B22.6 Procedure
B22.7 Result
B23 M.O.T. 5.2.2 – 89 Determination of CO/CO2 ratio in flue products under conditions of flueway blockage, downdraught or updraught
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. 5.4.2/5 – 94 Flame abnormality 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. – 89 Drying performance—Rotary laundry dryers
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. – 89 Drying performance—Static laundry dryers
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 – 2002 Temperature hazards
B27.1 Scope
B27.2 Method
B27.3 Apparatus
B27.4 Materials
B27.5 Preparation of apparatus
B27.6 Procedure
B27.7 Result
B28 M.O.T. – 93 Temperature hazards—Electric motors
B28.1 Scope
B28.2 Method
B28.3 Apparatus
B28.4 Materials
B28.5 Preparation of apparatus
B28.6 Procedure
B28.7 Calculations
B28.8 Result
B29 M.O.T. 5.7.1 – 77 Temperature hazards—Rotary laundry dryers—No damage during normal operation
B29.1 Scope
B29.2 Method
B29.3 Apparatus
B29.4 Materials
B29.5 Preparation of apparatus
B29.6 Procedure
B29.7 Result
B30 M.O.T. 5.7.2 – 77 Temperature hazards—Rotary laundry dryers—Operating control temperature limit
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. 5.7.3 – 93 Over-temperature cut-out devices—Rotary laundry dryers
B31.1 Scope
B31.2 Method
B31.3 Apparatus
B31.4 Preparation of apparatus
B31.5 Procedure
B31.6 Result
B32 M.O.T. 5.7.4 – 90 Determination of CO/CO2 ratio in combustion products from rotary laundry dryers under conditions of lint screen blockage
B32.1 Scope
B32.2 Method
B32.3 Apparatus
B32.4 Materials
B32.5 Preparation of apparatus
B32.6 Procedure
B32.7 Result
B33 M.O.T. 5.8.1(a) – 77 Temperature hazards—Static laundry dryers—Blockage of grid by fallen clothing
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. 5.8.1(b) – 73 Temperature hazards—Static laundry dryers—No scorching when clothing falls from racks
B34.1 Scope
B34.2 Method
B34.3 Materials
B34.4 Preparation of apparatus
B34.5 Procedure
B34.6 Result
B35 M.O.T. 5.9.1 – 83 Heat resistance—Static and rotary laundry dryers
B35.1 Scope
B35.2 Method
B35.3 Apparatus
B35.4 Materials
B35.5 Preparation of apparatus
B35.6 Procedure—Static laundry dryers
B35.7 Procedure—Rotary laundry dryers
B35.8 Result
B36 M.O.T. 5.9.2 – 85 Heat resistance—Light back condition
B36.1 Scope
B36.2 Method
B36.3 Apparatus
B36.4 Materials
B36.5 Preparation of apparatus
B36.6 Result
B37 M.O.T. – 91 Strength—Stability and doors
B37.1 Scope
B37.2 Method
B37.3 Apparatus
B37.4 Preparation of apparatus
B37.5 Procedure
B37.6 Result
B38 M.O.T. – 91 Strength—Drop down doors
B38.1 Scope
B38.2 Method
B38.3 Apparatus
B38.4 Preparation of apparatus
B38.5 Procedure
B38.6 Result
B39 M.O.T. – 73 Strength—Grid—Static laundry dryers
B39.1 Scope
B39.2 Method
B39.3 Apparatus
B39.4 Preparation of apparatus
B39.5 Procedure
B39.6 Result
B40 M.O.T. 5.11 – 97 Room sealed appliances where air intake and flue products discharge are outside the building
B40.1 Scope
B40.2 Method
B40.3 Apparatus
B40.4 Materials
B40.5 Preparation of apparatus
B40.6 Procedure
B40.7 Result
B41 M.O.T. 5.12.1 – 2002 Vitiation test
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. 5.12.2 – 2002 Linting test
B42.1 Scope
B42.2 Method
B42.3 Apparatus
B42.4 Materials
B42.5 Preparation of apparatus
B42.6 Procedure
B42.7 Result
Appendix C
Appendix D
Cited references in this standard
Content history
DR 04278