【AS澳大利亚标准】AS NZS 3666.2-2002 Air-handling and water systems of buildings - Microbial control - Operation and maintenanc.doc

as/nzs 3666.2:2002licensed to marley temcel australia on 11 sep 2003. 1 user personal user licence only. storage, distribution or use on network prohibited.as/nzs 3666.2australian/new zealand standardair-handling and water systems of buildingsmicrobial controlbuilding code of australiaprimary referenced standardpart 2:operation and maintenancelicensed to marley temcel australia on 11 sep 2003. 1 user personal user licence only. storage, distribution or use on network prohibited.as/nzs 3666.2:2002this joint australian/new zealand standard was prepared by joint technical committee me-062, ventilation and airconditioning. it was approved on behalf of the council of standards australia on 8 march 2002 and on behalf of the council of standards new zealand on 21 march 2002. it was published on 2 may 2002.the following interests are represented on committee me-062:air-conditioning and refrigeration equipment manufacturers association ofaustraliaaustralasian fire authorities councilaustralian building codes boardaustralian chamber of commerce and industryaustralian industry groupaustralian institute of building surveyorsaustralian institute of refrigeration air conditioning and heatingchartered institution of building services engineersdepartment of contract and management services, w.a.fpa australiainstitute of refrigeration heating and air conditioning engineers of new zealandinstitute of engineers australiaplastics and chemicals industries associationproperty council of australiaadditional interests participating in the preparation of this standard: department of human services (vic)department of human services (tas)institute of plant engineers australasianational health and medical research councilnsw health departmentqueensland healthtelstra corporationkeeping standards up-to-datestandards are living documents which reflect progress in science, technology and systems. to maintain their currency, all standards are periodically reviewed, and new editions are published. between editions, amendments may be issued. standards may also be withdrawn. it is important that readers assure themselves they are using a current standard, which should include any amendments which may have been published since the standard was purchased.detailed information about joint australian/new zealand standards can be found by visiting the standards australia web site at .au or standards new zealand web site at www.standards.co.nz and looking up the relevant standard in the on-line catalogue.alternatively, both organizations publish an annual printed catalogue with full details of all current standards. for more frequent listings or notification of revisions, amendments and withdrawals, standards australia and standards new zealand offer a number of update options. for information about these services, users should contact their respective national standards organization.we also welcome suggestions for improvement in our standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. please address your comments to the chief executive of either standards australia international or standards new zealand at the address shown on the back cover.this standard was issued in draft form for comment as dr 00269.as/nzs 3666.2:2002licensed to marley temcel australia on 11 sep 2003. 1 user personal user licence only. storage, distribution or use on network prohibited.australian/new zealand standardair-handling and water systems of buildingsmicrobial controlpart 2:operation and maintenanceoriginated as part of as 36661989. previous edition as/nzs 3666.2:1995. second edition 2002.copyright standards australia/standards new zealandall rights are reserved. no part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.jointly published by standards australia international ltd, gpo box 5420, sydney, nsw 2001 and standards new zealand, private bag 2439, wellington 6020isbn 0 7337 4453 2licensed to marley temcel australia on 11 sep 2003. 1 user personal user licence only. storage, distribution or use on network prohibited.prefacethis standard was prepared by the joint standards australia/standards new zealandcommittee me-062, ventilation and airconditioning, to supersede as/nzs 3666.2:1995.this standard forms part 2 of a series of standards for the microbial control of air-handling and water systems, as follows:as/nzs3666air-handling and water systems of buildings microbial control3666.1part 1:design, installation and commissioning3666.2part 2:operation and maintenance3666.3part 3:performance-based maintenance of cooling water systemsthe term informative has been used in this standard to define the application of the appendix to which it applies. an informative appendix is only for information and guidance. notes to clauses in the standard are informative only.9as/nzs 3666.2:2002licensed to marley temcel australia on 11 sep 2003. 1 user personal user licence only. storage, distribution or use on network prohibited.contentspagesection 1 scope and general1.1scope. 41.2objective . 41.3application . 41.4referenced documents. 41.5definitions. 5section 2 operation and maintenance2.1scope. 62.2general. 62.3maintenance of air-handling systems . 72.4maintenance of heated water systems. 82.5maintenance of cooling water systems . 82.6operating and maintenance manuals and maintenance records . 9appendixaguidelines for the use of personal protective equipment during inspection and maintenance of air-handling andwater systems . 10licensed to marley temcel australia on 11 sep 2003. 1 user personal user licence only. storage, distribution or use on network prohibited.standards australia/standards new zealandaustralian/new zealand standardair-handling and water systems of buildingsmicrobial controlpart 2: operation and maintenances e c t i o n1s c o p ea n dg e n e r a l1.1 scopethis standard specifies minimum requirements for the operation and maintenance of air- handling and water systems of buildings for the purposes of microbial control. it does not include requirements for refrigerated room airconditioners and non-ducted split systems.notes:1in the event of an outbreak of legionnaires disease, special action will be necessary. this will be advised by the health authorities.2further information on the control of microbial growth in air-handling and water systems of buildings is given in hb 32.3design, installation and commissioning requirements are given in as/nzs 3666.1.4as/nzs 3666.3 provides a performance-based alternative to the prescriptive cleaning requirements of clause 2.5 of this standard.5refer to regulatory authority for application of the criteria to buildings.1.2 objectivethe objective of this standard is to assist users in the control of microorganisms in building systems,particularlythoseassociatedwithlegionnairesdisease,pontiacfever, hypersensitivity pneumonitis and humidifier fever.1.3 applicationthis standard is intended for use by regulatory authorities, building services designers, architects, equipment manufacturers and suppliers, installers, maintenance personnel, managers, owners, and operating staff responsible for designing, installing, commissioning, operating, and maintaining the air-handling and water systems of a building. it provides minimum requirements.the standard shall be read in conjunction with any additional recommendations given by suppliers of the equipment and with the requirements of any relevant specification or applicable regulation.note: this standard has been developed for commercial building services systems. the technical content may be applied by the regulatory authority to other commercial or industrial systems and to domestic systems incorporating a cooling water system.1.4 referenced documentsthe following documents are referred to in this standard: as1470heath and safety at workprinciples and practicescopyrightlicensed to marley temcel australia on 11 sep 2003. 1 user personal user licence only. storage, distribution or use on network prohibited.as1657fixed platforms, walkways, stairways and laddersdesign, construction and installation1851maintenance of fire protection equipment1851.6part 6:management procedures for maintaining the fire precaution features of air-handling systemsas/nzs1892portable ladders1982.1part 1:metal1715selection, use and maintenance of respiratory protective devices1716respiratory protective devices2865safe working in a confined space3500national plumbing and drainage3500.1.2part 1.2: water supplyacceptable solutions3500.4.2part 4.2: hot water supply systems acceptable solutions3666air-handling and water systems of buildingsmicrobial control3666.1part 1:design, installation and commissioning3666.3part 3:performance-based maintenance of cooling water systemssai/snzhb 32control of microbial growth in air-handling and water systems of buildingsnzs4302code of practice for the control of hygiene in air and water systems in buildingsansinfpa 90ainstallation of air conditioning and ventilating systems in buildings1.5 definitionsfor the purpose of this standard, the definitions given in as/nzs 3666.1 and those below apply.1.5.1 disinfectionthe preventive maintenance action of applying a shock treatment to a system, in conjunction with system cleaning, in order to reduce the general concentration of infectious agents.1.5.2 emergency decontaminationthe reduction, to negligible or low concentrations, of known high concentrations of a specific contaminant such as legionella in response to an emergency.1.5.3 maintenancethat regular routine activity aimed at preserving the operational standard and cleanliness of equipment, which includes inspection, repair, preventive service and cleaning.1.5.4 maintenance programthe assembly of relevant data and the setting out of a formal strategy and recording system for the effective management of a series of maintenance procedures.1.5.5 maintenance reporta written communication, giving details of the physical and operational state of a piece of equipment when maintenance is carried out, which is sent to the building owner or agent.licensed to marley temcel australia on 11 sep 2003. 1 user personal user licence only. storage, distribution or use on network prohibited.s e c t i o n2o p e r a t i o na n d m a i n t e n a n c e 2.1 scopethis section sets out minimum requirements for regular routine maintenance. it does not deal with emergency procedures applicable during outbreaks of legionnaires disease.note: further information on the maintenance of building systems is given in saa/snz hb 32 and nzs 4302.2.2 general2.2.1 servicingall plant, equipment and components shall, unless otherwise stated in this standard, be serviced and maintained in accordance with the suppliers published requirements and best practice. maintenance shall be carried out by competent personnel as described in clause 2.6. maintenance personnel shall follow the site safety and security procedures.maintenance shall be implemented by the building owner or nominee in accordance with the requirements of this section, except that alternative maintenance measures may be approved by the regulatory authority. the equipment to be maintained shall be shut down while maintenance is being carried out to prevent particulate matter being passed through the system. appropriate protective gear complying with the requirements of regulatory authorities shall be worn. where relevant, the requirements of as 1470, as/nzs 1715, as/nzs 1716 and as/nzs 2865 shall be complied with.notes:1regular cleaning and suitable water treatment are considered to be effective measures as part of a maintenance program for the control of the proliferation of legionella in cooling water systems. passivation and water treatment should be fully restored after system flushing, cleaning, disinfection or decontamination.2guidelines for the use of personal protective gear are given in appendix a.2.2.2 precautions when using and storing chemicalsall chemical products used, and their labelling, packaging, storage conditions, user instructions, hazardous signage and material safety data sheets shall comply with the requirements of the regulatory authority.note: care should be taken in the use of biocides, cleaning agents and any other chemicals in equipment such as humidifiers, spray coils and evaporative air cooling equipment. chemicals, when entrained in the airstream, may be hazardous to public health. suppliers recommendations, including material safety data sheets and other information should be obtained to ensure the proper use of chemicals.2.2.3 access for maintenanceeasy and safe access for cleaning, inspection and maintenance shall be available to and about all plant, equipment and components covered in this section. relevant requirements of as 1470, as 1657, as/nzs 1892.1 and as/nzs 2865 shall be complied with.2.2.4 provision for maintenanceprovision shall be made within the system to facilitate service and maintenance.licensed to marley temcel australia on 11 sep 2003. 1 user personal user licence only. storage, distribution or use on network prohibited.2.3 maintenance of air-handling systems2.3.1 air intakes and exhaust outletsair intakes and exhaust outlets shall be inspected at least monthly and cleaned, where necessary.2.3.2 air filterswhere installed, air filters shall be inspected monthly and cleaned or replaced, where necessary, in accordance with clause .3.3 humidifiers steam and spray humidifiersline strainers, valves, sparge pipes, spray nozzles and components discharging moisture into the airstream shall be inspected monthly and cleaned, where necessary. associated sensors and controls shall be maintained and calibrated by qualified personnel and operated in accordance with the suppliers requirements. boiling and pan-type humidifierstanks, trays and discharge devices shall be inspected monthly and cleaned, where necessary.2.3.4 evaporative air-cooling equipmentthe following components shall be inspected at least every three months while the system is in use and maintained as indicated:(a)sump . drained and cleaned. (b)wetted pads . cleaned and replaced when necessary. (c)water strainer . cleaned when necessary. (d)air filter, where fitted .replaced. (e)drainage system . flushed with clean fresh water.evaporative airconditioning equipment, when not in use for periods greater than one month, shall be drained.notes:1the bleed-off and the distribution of water over the wetted pads should be checked to ensure effective operation. the water level in the storage sump should be maintained during operation above the indicated minimum level.2automatic draining of water sumps is often an effective method for preventing or reducing microbial population multiplication.2.3.5 ducts and componentsthe air-handling system shall be inspected and maintained in accordance with as 1851.6 and nfpa 90a. ductwork and other air-handling plant comprising the air-handling system shall be service