Skip to content
OBJECTIVE : To lay down a procedure for Maintenance of Air Handling Unit.
SCOPE: This SOP is applicable to Air Handling Unit at Formulations II Service floor.
RESPONSIBILITY: Technical Supervisor / Engineer .
ACCOUNTABILITY: Head of Department and Head QA.
PROCEDURE:
Check and ensure that the difference between inlet and outlet temperature of chilled water is with in the limit (40 – 80º C).
Check & ensure no unusual noise from the system.
Check for any air leakages from the plenum and inspection doors and correct if any.
Put a Tick mark ( √ ) in Daily Check Sheet as per Annexure – I after completion of each activity. If it is not O.K put a cross (X) in Daily Check Sheet indicating the reason in remarks column.
Immediately inform to the concern superior if it is not O.K (X) and take necessary corrective action as per the advice.
Any such deviations should be maintained in the Machine History Cord along with necessary corrective action and its complaints there of.
Check condition of the belt for wear, tear and damage and replace if damaged and clean the area with lint free cloth.
Clean the AHU and its surroundings with lint free cloth.
Ensure no air leakages from the connection.
Check and ensure free flow of water in drain pipeline, clean with compressed air if pipe line is jammed.
Ensure no vibration from the system and correct if any.
Check and ensure the panel doors are closed properly.
Check and ensure all the indication lamps are glowing, replace the lamps if not working.
Clean the motor and blower pulley grooves with cloth to clear of any belt rubber strains.
Put a Tick mark (√) in Weekly Check Sheet as per Annexure II and repeat the above steps.
Monthly Maintenance:
Clean the filters as per SOP, replace the filter if found any damage on filter screen. (Applicable to all Module AHUs only).
Re grease the motor and blower bearings.
Check and ensure the modulating motor function w.r.t. Proportional thermostat setting.
Check and ensure functioning of heaters in plenum w.r.t. control thermostat setting.
Check and ensure the dampers of supply, return and fresh air ducts are in the correct position.
Check the motor load current and record it.
Check and ensure the Isolator / Switch functioning.
Clean the control panel with air blower and ensure no control wires should hang, tag the wires with cable tag if it is hanging.
Put a Tick mark (√) in Monthly Check Sheet as per Annexure III and repeat the above steps.
Quarterly Maintenance:
Clean the chilled water coil strainers.
Clean the filters as per SOP, replace the filter if found any damage on filter screen. (Applicable to all Primary, secondary packing, dispensing, quarantine AHUs.).
Ensure no air leakages from ducts and plenum doors.
Ensure no chilled water leakages from pipe joints, and gauge connections.
Regrease the bearings of the motor and blower.
Clean the outer surface of the cooling coils with wire brushes, compressed air, water and cleaning chemical (shiny side or van clean).
Clean the contactors with CTC / CRC.
Put a Tick mark (√) in Quarterly Check Sheet as per Annexure IV and repeat the above steps.
Half Yearly Maintenance:
Replace pre- filter with new filter if pressure drop across the filters is more than the 14 mm of WC or any damages and ensure no gap between the filters and frame.
Check and ensure the CFM of the blower with anemometer with respect to design parameters.
Clean the outer surface of the cooling coils with wire brushes, compressed air, water and cleaning chemical (shiny side or van clean).
Check the dynamic balance of the blower by empty rotation, make it balance if found any unbalance.
Clean the surface of the motor with lint free Cloth.
Ensure the cooling fan of motor is properly aligned.
Clean the external surface of the blower.
Put a Tick mark (√) in Half Yearly Check Sheet as per Annexure V and repeat the above steps.
Yearly Maintenance:
Replace intermediate filter with new filter if pressure drop across the filters is more than the 14 mm of WC or any damages and ensure no gap between the filters and frame.
Replace sub- intermediate filter with new filter if pressure drop across the filters is more than the 14 mm of WC or any damages and ensure no gap between the filters and frame.
Check the motor/ blower bearings clearance with feeler gauges, replace the bearings if clearance is more than 0.1 mm.
Carry out the DOP, Particle count and velocity tests for 0.3 micron HEPA filters.
Ensure all the control wiring is neatly dressed condition.
Check the panel earthing.
Put a Tick mark (√) in Yearly Check Sheet and repeat the above steps.
Distribution Details: QA and Engineering,Production .
REVISION: Due to change of organisation logo
Categories Engineering Tags Aberdeen , Aberdeenshire , Abu Dhabi , Abu Dhalouf , Abu Hamour , Abu Samra , ABUJA , ACCRA , Acre , Ad Dawhah al Jadidah , ADDIS ABABA , Adelaide , AFGHANISTAN , Agra , Agrigento , Ahmedabad , Aïn Beïda , Ain Khaled , Ain Sinan , Ajman , Ajman and Ra’s al-Khaimah , Ajmer , Al Ain , Al Aziziya , Al Bidda , Al Daayen , Al Dafna , Al Ebb , Al Egla , Al Gharrafa , Al Ghuwariyah , Al Hilal , Al Jasrah , Al Jeryan , Al Karaana , Al Kharaitiyat , Al Kharayej , Al Kharrara , Al Kheesa , Al Khor , Al Khulaifat , Al Luqta , Al Mamoura , Al Mansoura , Al Markhiyah , Al Mashaf , Al Masrouhiya , Al Mearad , Al Messila , Al Mirqab , Al Najada , Al Nasraniya , Al Qassar , Al Rufaa , Al Sadd , Al Sailiya , Al Sakhama , Al Seej , Al Shagub , Al Souq , Al Tarfa , Al Thakhira , Al Themaid , Al Thumama (Al Wakrah) , Al Thumama (Doha) , Al Utouriya , Al Waab , Al Wajba , Al Wakrah , Al Wukair , Al Zubarah , Al-Shahaniya , Alagoas , ALBANIA , Alberta , Alessandria , ALGERIA , Algiers , Aligarh , Allahabad , Allerdale , Amapa , Amazonas , Amber Valley , Amersham , AMMAN , Ampthill , Amravati , Amritsar , Amsterdam , Amur , Ancona , and Craigavon , and Down , ANDORRA , ANDORRA LA VELLA , ANGOLA , Angus , ANKARA , Annaba , ANTANANARIVO , ANTIGUA & BARBUDA , Antrim and Newtownabbey , Antwerp , Aosta , APIA , Ar Ru'ays , Ards and North Down , ARGENTINA , Argyll and Bute , Arkhangelsk , Arlington , Armagh , ARMENIA , As Salatah , Ascoli Piceno , Ashbourne , ASHGABAT , ashington , Ashland , Ashmore and Cartier Islands , ASMARA , Asti , Astrakhan , ASUNCIÓN , Athens , Auckland , Aurangabad , australia , Australian Antarctic Territory , Australian Capital Territory , Austria , Avellino , Aylesbury , Aylesbury Vale , AZERBAIJAN , Baaya , BAGHDAD , BAHAMAS , Bahia , BAHRAIN , BAKU , BAMAKO , Banbridge , BANDAR SERI BEGAWAN , Bangalore , BANGKOK , Bangladesh , Bangor , BANGUI , Bani Hajer , BANJUL , Barahat Al Jufairi , BARBADOS , Barcelona , Bareilly , Bari , Barletta-Andria-Trani , Barrow-in-Furness , BASSETERRE , Bath , Batna , Bavaria , Beaconsfield , Béchar , Bedford , BEIJING , BEIRUT , Béjaïa , Belarus , Belfast , Belgium , Belgorod , Belgrade , BELIZE , Belluno , BELMOPAN , Belper , Benevento , BENIN , Bergamo , Berlin , BERN , Bhavnagar , Bhilai Nagar , Bhiwandi , Bhopal , Bhubaneswar Salem , BHUTAN , Biella , Bikaner , Birmingham , Birmingham (West Midlands) , BISHKEK , Biskra , BISSAU , Blackburn with Darwen , Blackpool , Blaenau Gwent , Blida , BLOEMFONTEIN , Bloomsbury , Bodmin , BOGOTÁ , BOLIVIA , Bologna , Bolsover , Bordj Bou Arreridj , BOSNIA & HERZEGOVINA , BOTSWANA , Bou Saâda , Bournemouth , Bracknell Forest , Bradford , BRASILIA , BRATISLAVA , brazil , BRAZZAVILLE , Bremen , Brescia , Bridgend , BRIDGETOWN , Brighton , Brighton and Hove , Brindisi , Brisbane , Bristol , British Columbia , BRUNEI , BRUSSELS , Brussels-Capital Region , Bryansk , Bu Fasseela , Bu Samra , Bu Sidra , Bucharest , Buckinghamshire , Budapest , BUENOS AIRES , BUJUMBURA , Bulgaria , BURKINA FASO , Burlington , BURUNDI , Buxton , CABO VERDE , Caerphilly , Cagliari , CAIRO , Caltanissetta , CAMBODIA , Cambridge , Cambridgeshire , Camden , CAMEROON , Campobasso , canada , Canberra , Canterbury , CAPE TOWN , Cardiff , Carlisle , Carmarthenshire , Caserta , CASTRIES , Catania , Catanzaro , Causeway Coast and Glens , Ceara , Centerville , CENTRAL AFRICAN REPUBLIC , Central Bedfordshire , Ceredigion , CHAD , Chalfont St. Giles , Chandigarh , Charlottetown , Chelmsford , Chelyabinsk , Chennai , Cheshire East , Cheshire West and Chester , Chester , Chesterfield , Chichester , Chieti , CHILE , Chiltern , China , Chlef , Christmas Island , City of London , Clackmannanshire , Clayton , Cleveland , Clinton , Clydebank , Coatbridge , Cockermouth , Cocos (Keeling) Islands , Coimbatore , Coldstream , colombia , COLOMBO , Como , COMOROS , CONAKRY , Congleton , CONGO , Constantine , Conwy , Copeland , Copenhagen , Coral Sea Islands , Cornwall , Cosenza , COSTA RICA , CÔTE D'IVOIRE(Ivory Coast) , Coventry , Cremona , Crewe , CROATIA , Cromarty , Crotone , CUBA , Cumbernauld , Cumbria , Cuneo , Cuttack , CYPRUS , Czech Republic , CZECH REPUBLIC (Czechia) , Dahl Al Hamam , DAKAR , Dalkeith , DAMASCUS , Darlington , Darwin , Dayton , Dehradun Garhwali , Delhi , Denbighshire , denmark , Derby , Derbyshire , Derbyshire Dales , Derry , Derry and Strabane , Devon , DHAKA , Djelfa , DJIBOUTI , DJIBOUTI (CITY) , DODOMA , Doha , Dombivali , DOMINICA , DOMINICAN REPUBLIC , Donetsk , Dorset , Dover , dubai , Dublin , Duhail , Dukhan , Dumfries and Galloway , Dunbar , Dundee , Dunkeld , Duns , Dunstable , Durgapur Asansol , Durham , DUSHANBE , East Ayrshire , East Devon , East Dunbartonshire , EAST JERUSALEM , East Lothian , East Midlands , East of England , East Renfrewshire , East Riding of Yorkshire , East Sussex , ECUADOR , Eden , Edinburgh , Edmonton , Egypt , El Eulma , El Oued , EL SALVADOR , Elgin , Ely , England , Enna , EQUATORIAL GUINEA , Erewash , ERITREA , Espirito Santo , Essex , estado , estados , ESTONIA , ESWATINI (formerly Swaziland) , ETHIOPIA , Exeter , Fairview , Falkirk , Falmouth , Faridabad , Fenland , Fereej Abdel Aziz , Fereej Al Amir , Fereej Al Asiri , Fereej Al Asmakh , Fereej Al Manaseer , Fereej Al Murra , Fereej Al Nasr , Fereej Al Soudan , Fereej Al Zaeem , Fereej Bin Durham , Fereej Bin Mahmoud , Fereej Bin Omran , Fereej Kulaib , Fereej Mohammed Bin Jassim , Fermanagh and Omagh , Fermo , Ferrara , Fife , FIJI , Finland , Firozabad , Flintshire , Florence , Foggia , Forlì-Cesena , Forres , Fort William , Fowey , france , Frankfurt Rhine-Main Region , Franklin , Fredericton , FREETOWN SINGAPORE , Frosinone , Fujairah , FUNAFUTI , Fuwayrit , GABON , GABORONE , Galashiels , GAMBIA , Genoa , Georgetown , Georgia , Germany , GHANA , Gharrafat Al Rayyan , Ghaziabad , Glasgow , Gloucester , Gloucestershire , Goias , Gorakhpur , Gorizia , Grasmere , Greater Glasgow , Greater London , Greater Manchester , greece , Greenock , Greenville , GRENADA , Grosseto , GUATEMALA , GUATEMALA CITY , Guelma , GUINEA , GUINEA-BISSAU , Gujarati , Gulbarga , Guntur , Gurgaon , Guwahati , GUYANA , Gwalior , Gwynedd , Haddington , HAITI , Halifax , Halton , Hamad Medical City , Hamburg , Hampshire , Haora , HARARE , Hartlepool , HAVANA , Hawick , Hawke's Bay , Hazm Al Markhiya , Heard Island and McDonald Islands , Helsinki , Helston , Hereford , Herefordshire , Hertfordshire , Hesse , High Peak , High Wycombe , Highland , Hobart , HONDURAS , HONIARA , Hove , Hubli and Dharwad , Hudson , Hungary , Huntingdon , Huntingdonshire , hyderabad , ICELAND , Imperia , Indonesia , Indore , Inverclyde , Invergordon , Inverness , Iqaluit , Iran , Iraq , ireland , Irkutsk , Irvine , Isernia , ISLAMABAD , Isle of Anglesey , Isle of Wight , Isles of Scilly , ISRAEL , Istanbul , Italy , Ivanovo , Izghawa (Al Rayyan) , Izghawa (Umm Salal) , Jabal Thuaileb , Jabalpur , Jackson , Jaipur , JAKARTA , Jalandhar , jamaica , Jammu , Jamnagar , Jamshedpur , japan , Jelaiah , JERUSALEM , Jervis Bay Territory , Jeryan Jenaihat , Jeryan Nejaima , Jhansi , Jijel , Jodhpur , jordan , JUBA , KABUL , Kaliningrad , Kaluga , Kalyan , KAMPALA , Kanpur , KATHMANDU , Katowice urban area , KAZAKHSTAN , Kazan , Kemerovo , Kendal , Kent , KENYA , Keswick , Kharkiv , KHARTOUM , Khawr al Udayd , Kiev , KIGALI , Kingston , Kingston upon Hull , KINGSTOWN , Kinross , KINSHASA , KIRIBATI , Kirkintilloch , Kirkwall , Kirov , Knutsford , Kochi , Kolkata , KOSOVO , Kostroma , Kota , Kraków , KUALA LUMPUR , Kurgan , Kursk , kuwait , KUWAIT CITY , KYRGYZSTAN , L'Aquila , La Spezia , Laghouat , Lancashire , Lancaster , LAOS , Latina , LATVIA , Launceston , Leabaib , Lebanon , Lebday , Lecce , Lecco , Leeds , Leicester , Leicestershire , Lejbailat , Lekhwair , Leningrad , Leqtaifiya (West Bay Lagoon) , LESOTHO , Lexington , LIBERIA , LIBREVILLE , LIBYA , Lichfield , LIECHTENSTEIN , Lijmiliya , Lille–Kortrijk–Tournai France/ Belgium , LILONGWE , LIMA , Lincoln , Lincolnshire , Lipetsk , Lisbon , Lisburn , Lisburn and Castlereagh , LITHUANIA , Liverpool , Livorno , LJUBLJANA , LOMÉ , london , Loni , Looe , Lossiemouth , Lostwithiel , Luaib , LUANDA , Lucca , Lucknow , Ludhian , Lusail , LUSAKA , Luton , LUXEMBOURG , M'Sila , Macclesfield , Macerata , MADAGASCAR , Madinat Al Kaaban , Madinat ash Shamal , Madinat Khalifa North , Madinat Khalifa South , Madison , Madrid , Madurai , Magadan Moscow , Maghnia , MAJURO , MALABO , malawi , Malaysia , MALDIVES MALE , MALI , MALTA , MANAGUA , MANAMA , Manchester , MANILA , Manitoba , Mantua , Maranhao , Marlborough , Marlow , Marseille , Mascara , MASERU , Massa and Carrara , Matera , Matlock , Mato Grosso , Mato Grosso do Sul , MAURITANIA , mauritius , MBABANE , Mebaireek , Médéa , Medway , Meerut , Mehairja , Melbourne , Merseyside , Merthyr Tydfil , Mesaieed , Mesaimeer , Messina , Mexico , MEXICO CITY , Mid and East Antrim , Mid Ulster , Middlesbrough , Midlothian , Milan , Milford , Milngavie , Milton , Milton Keynes , Minas Gerais , Minsk , Modena , MOGADISHU , Monmouthshire , MONROVIA , MONTEVIDEO , Monza and Brianza , Moradabad , Moray , MORONI , Moscow , Mostaganem , Motherwell and Wishaw , Mount Vernon , Mourne , Muaither , Mumbai , Muraikh , Murmansk , MUSCAT , Mushayrib , Mysore , N'DJAMENA , Nagpur , NAIROBI , Najma , NAMIBIA WINDHOEK , Nanded Kolapur , Nantwich , Naples , Nashik , NASSAU , NAURU , Navi Mumbai , Neath Port Talbot , Nellore , Nelson , Nepal , Netherlands , New Al Hitmi , New Al Mirqab , New Al Rayyan , New Brunswick , New Fereej Al Ghanim , New Fereej Al Khulaifat , New Plymouth , New Salata , New South Wales , new Zealand , Newfoundland and Labrador , Newport , NewportAuburn , Newquay , Newry , NGERULMUD , NIAMEY , NICARAGUA , NICOSIA , NIGER , Nigeria , Nizhniy Novgorod , Nizhny , Noida , Norfolk , Norfolk Island , North , North Ayrshire , North East Derbyshire , North East Lincolnshire , NORTH KOREA , North Lanarkshire , North Lincolnshire , NORTH MACEDONIA , North Somerset , North West , North Yorkshire , Northamptonshire , Northern , Northern Ireland , Northern Territory , Northumberland , Northwest Territories , Northwich , Norway , Norwich , Nottingham , Nottinghamshire , NOUAKCHOTT , Nova Scotia , Novara , Novgorod , Novosibirsk , Nu`ayjah , Nunavut , Nuoro , NUR-SULTAN , Nuremberg , Oakland , Old Al Ghanim , Old Al Hitmi , Old Al Rayyan , oman , Omsk , Onaiza , OntarioToronto , Oran , Orenburg , Oristano , Orkney Islands , Oryol , OSLO , Otago , Ottawa , OUAGADOUGOU , Ouargla , Oxford , Oxfordshire , Padua , Paisley , Pakistan , PALAU , Palermo , PALESTINE , PANAMA , PANAMA CITY , PAPUA NEW GUINEA , Para , PARAGUAY , Paraiba , PARAMARIBO , Parana , Paris , Parma , Patna , Pavia , Pembrokeshire , Penrith , Penryn , Penza , Penzance , Pernambuco , Perth , Perth and Kinross , peru , Perugia , Pesaro and Urbino , Pescara , Peterborough , Philippines , PHNOM PENH , Piacenza , Piaui , Pimpri , Pisa , Pistoia , Plymouth , Poland , Poole , Pordenone , PORT LOUIS , PORT MORESBY , PORT OF SPAIN , PORT VILA , PORT-AU-PRINCE , Porto Portugal , PORTO-NOVO , Portsmouth , portugal , Potenza , Powys , Prague , PRAIA , Prato , Preston , PRETORIA , Prince Edward Island , PRISTINA , Pskov , Pune , PYONGYANG , Qatar , Quebec City , Queensland , QUITO , Ragusa , Raipur , Rajkot , Ramsey , Ranchi , Ras Abu Aboud , Ras Al Khaimah , Ras Lafan , Ravenna , Rawdat Al Hamama , Rawdat Al Khail , Rawdat Egdaim , Rawdat Rashed , Reading , Redcar and Cleveland , Reggio Calabria , Reggio Emilia , Regina , Relizane , Renfrew , Renfrewshire , Repton , REYKJAVIK , Rhondda Cynon Taf , Rieti , RIGA , Rimini , Rio de Janeiro , Rio Grande , Ripon , Riverside , RIYADH , Romania , Rome , ROSEAU , Rostov , Rotterdam , Rovigo , Rumeilah , Russia , Rutland , RWANDA , Ryazan , Saharanpur , Saïda , SAINT GEORGE'S , SAINT JOHN'S , SAINT KITTS & NEVIS , SAINT LUCIA , Saint Petersburg , SAINT VINCENT & THE GRENADINES , Sakhalin , Salem , Salerno , Salford , Salisbury , Saltash , Samara , SAMOA , SAN JOSE , SAN MARINO , SAN SALVADOR , Sandhurst , SANTIAGO , SANTO DOMINGO , SÃO TOMÉ & PRÍNCIPE , SÃO TOMÉ SAUDI ARABIA , SARAJEVO , Saratov , Saskatchewan , Sassari , Savona , Sawda Natheel , Saxony , Scotland , Scottish Borders , SENEGAL , SEOUL , Serbia , Sétif , Seville , SEYCHELLES , Shagra , Sharjah , Sheffield , Shetland Islands , Shropshire , Sidi bel Abbès , Siena , SIERRA LEONE , Siliguri , Simaisma , singular , Skikda , SKOPJE , Slough , SLOVAKIA , SLOVENIA , Smolensk , Sofia , Solapur , SOLOMON ISLANDS , SOMALIA , Somerset , Sondrio , Souk Ahras , SOUTH AFRICA , South Australia , South Ayrshire , South Bucks , South Cambridgeshire , South Derbyshire , South East , South Gloucestershire , SOUTH KOREA , South Lakeland , South Lanarkshire , South Sardinia , SOUTH SUDAN , SOUTH TARAWA , South Tyrol , South West , South Yorkshire , Southampton , Southend-on-Sea , Southland , spain , Springfield , SRI JAYAWARDENEPURA KOTTE , Sri Lanka , Srinagar , St Albans , St Asaph , St Davids , St. Austell , St. Ives , St. John's , Staffordshire , Stirling , STOCKHOLM , Stockton-on-Tees , Stoke Poges , Stoke-on-Trent , Stuttgart , SUCRE , sudan , Suffolk , Sunderland , Surat , SURINAME , Surrey , SUVA , Sverdlovsk , Swansea , Sweden , Swindon , switzerland , Sydney , Syracuse , SYRIA , TAJIKISTAN , TALLINN , Tambov , TANZANIA , Taranto , TASHKENT , Tasmania , TBILISI , Tébessa , TEGUCIGALPA , TEHRAN , Telford , Telford and Wrekin , Teramo , Terni , Thailand , Thane , The Hague , The Pearl , THIMPHU , Thiruvananthapuram , Thuringia , Thurrock , Thurso , Tiaret , TIMOR-LESTE DILI , Tintagel , TIRANA , Tiruchirappalli , Tizi Ouzou , Tlemcen , TOGO , TOKYO , Tomsk , TONGA NUKUʻALOFA , Torbay , Trapani , Trento , Treviso , Trieste , TRINIDAD & TOBAGO , TRIPOLI , Truro , Tula , TUNIS , TUNISIA , Turin , turkey , TURKMENISTAN , TUVALU , Tver , Tyne and Wear , Tyumen , Udine , UGANDA , Ujjain , Ukraine , Ukraine. Dnipropetrovsk , Ulhasnagar , Ulyanovsk , Umm al-Qaiwain , Umm al-Quwain , Umm Bab , Umm Birka , Umm Ghuwailina , Umm Lekhba , Umm Qarn , Umm Salal Ali , Umm Salal Mohammed , United arab emirates , UNITED ARAB EMIRATES (UAE) , united Kingdom , UNITED KINGDOM* (UK) , United States , UNITED STATES OF AMERICA (USA) , URUGUAY , UZBEKISTAN , Vadodara , VADUZ , Vale of Glamorgan , Valencia , VALLETTA MARSHALL ISLANDS , VANUATU , Varanasi , Varese , Vasai Virar , VATICAN CITY , VATICAN CITY (Holy See) , VENEZUELA CARACAS , Venice , Verbano-Cusio-Ossola , Vercelli , Verona , Vibo Valentia , Vicenza , Victoria , Vienna , VIENTIANE , VIETNAM HANOI , Vijayawada , VILNIUS , Visakhapatnam , Viterbo , Vladimir , Volgograd , Vologda , Voronezh , Wadi Al Banat , Wadi Al Sail , Wadi Al Wasaah , Wadi Lusail , Wakefield , Wales , Warrington , Warsaw , Warwickshire , Washington , Wellington , Wells , West Berkshire , West Dunbartonshire , West Lothian , West Midlands , West Sussex , West Yorkshire , West Yorkshire (Bradford–Leeds) , Western Australia , Western Isles , Westland , Whitehaven , Whitehorse , Wick , Wiltshire , Winchester , Windsor and Maidenhead , Winnipeg , Wisbech , Wokingham , Wolverhampton , Worcester , Worcestershire , Workington , Wrexham , Wrexham Qatar , Wycombe , YAMOUSSOUKRO , YAOUNDE , YAREN DISTRICT , Yaroslavl , Yellowknife , YEMEN SANA'A ZAMBIA , YEREVAN , York , Yorkshire and the Humber , Yukon , ZAGREB , ZIMBABWE , Zürich