B.22 Packaged Airconditioning - VN - Centrepoint

PACKAGED AIRCONDITIONING

The English language version prevails. u tin ting Anh khi c tranh ci.

Centrepoint Page 1 of 16 of B.22 18 September 2007

PACKAGED AIRCONDITIONING MY IU HO KHNG KH LOI NH

1 GENERAL 1 TNG QUT

1.1 FUNCTIONAL DESCRIPTION 1.1 M T The Packaged Air Conditioning scope of work covers the split air conditioning units. Where water cooled package units are provided (eg for 24/7 applications or retail), they should also follow this specification.

Phm vi cng vic ca h thng my iu ha khng kh cc b bao gm my lnh cc b hai. Nhng ni s dng my lnh cc b gii nhit nc (ng dng chy 24/7 hoc khu bn hng), theo c tnh k thut ny.

1.2 CROSS REFERENCES 1.2 THAM CHIU CHO

General Refer to the General Requirements worksection.

Tng qut Ph hp vi chng Nhng yu cu chung.

Related Worksections Mechanical General Requirements, Cooling Towers, Air Filters, Air Coils, Ductwork, Ductwork Insulation, Fire Stopping, Acoustic & Vibration Control,, Mechanical Electrical..

Nhng chng lin quan Tham chiu n cc chng sau: Nhng yu cu chung v c kh, Thp gii nhit, Lc gi, ng gi, Cch nhit ng gi, Cht ngn chy, Kim sot n v rung n, in c kh.

1.3 STANDARDS 1.3 TIU CHUN

General Refrigeration systems: To AS/NZS 1677.2 and the recommendations of SAA HB40.1 and SAA HB40.2. Performance labelling: To AS/NZS 3823.1.1, AS/NZS 3823.1.2 and AS/NZS 3823.2. Microbial control: To AS/NZS 3666.1 and the recommendations of SAA/SNZ HB32. Ductwork and insulation: To AS 4254. Air filter performance and construction: To AS 1324.1.

Tng qut H thng lm lnh: theo AS/NZS 1677.2 v cc yu cu trong SAA HB40.1 v SAA HB40.2. Cng sut ghi nhn: theo AS/NZS 3823.1.1, AS/NZS 3823.1.2 v AS/NZS 3823.2. Kim sot vi khun: theo tiu chun AS/NZS 3666.1 v cc yu cu trong SAA/SNZ HB32. ng gi v cch nhit: theo AS 4254. c tnh lc gi v cu to: theo tiu chun AS 1324.1.

1.4 INTERPRETATION 1.4 KHI NIM

Definitions Direct expansion split systems with total cooling capacity when tested to AS/NZS 3823.1.1 or AS/NZS 3823.1.2, Standard test condition T1: - Room airconditioner: < 7.5kW. - Packaged airconditioner: 7.5kW. Split systems: Supply only indoor and outdoor units of split systems designed and rated by the manufacturer to operate together.

Cc nh ngha H thng gin n trc tip hai mnh c tng cng sut lnh khi th nghim theo AS/NZS 3823.1.1 hoc AS/NZS 3823.1.2, iu kin th nghim tiu chun T1: My DHKK cho phng:




vi nhau.

2 QUALITY 2 CHT LNG

2.1 PRE-COMPLETION TESTS 2.1 TH NGHIM TRC KHI HON TT

Standards Provide airconditioning equipment that has been subjected to physical test in conformance to the following: - Non-ducted airconditioners: To

AS/NZS 3823.1.1. - Ducted airconditioners: To AS/NZS

3823.1.2. Labelling Required: To AS/NZS 3823.2.

Tiu chun Cung cp thit b HKK c kim tra vt l theo hnh dng nh sau: - My iu ho khng s dng ng

gi: theo AS/NZS 3823.1.1. - My iu ho s dng ng gi:

theo AS/NZS 3823.1.2. Ghi nhn: Yu cu: theo AS/NZS 3823.2

3 PRODUCTS 3 THIT B

3.1 ROOM AIRCONDITIONER GENERAL

3.1 TNG QUT MY IU HO CC B

Safety General: Comply with AS/NZS 3350.2.34 and AS/NZS 3350.2.40.

An ton Tng qut: tun th theo AS/NZS 3350.2.34 and AS/NZS 3350.2.40.

Construction Insulation: Insulate and vapour seal to prevent external condensation under all operating conditions. Supply fan: Centrifugal with multi-speed or variable speed motor. Filter performance to AS 1324.1: G2 rating, Type 1, Class C. Condenser fans: Low speed propeller or axial. Coils: Copper tube, aluminium plate fin type with no moisture carry over. Drains: Provide aluminium, stainless steel or plastic drain trays to collect all moisture generated inside unit. Provide trapped drain to waste.

Cu to Cch nhit: cch nhit v lm kn m trnh ngng t nc mt ngoi tt c cc iu kin hot ng. Qut gi cp: qut ly tm nhiu tc hoc loi thay i tc Lc gi thc hin theo AS 1324.1: c G2, Loi 1, phn lp C. Qut dn ngng: qut hng trc t cnh hoc nhiu cnh tc thp Dn coil: ng ng, l tn nhit nhm khng mang hi m Mng nc ngng: cung cp bng nhm, thp khng r hay khay plastic hng nc ngng t bn trong dn lnh. Cung cp by nc ngng.

Refrigeration system Refrigerant: R22, R407C or R410A. Provide: - Expansion device. - High-pressure and low-pressure

compressor cutouts. - Suction pressure gauge connection

points. - Isolating valves between split units. - Defrost timer/thermostat with sensing

bulb (reverse cycle units only). Refrigerant reversing valve (reverse cycle units only).

H thng gas lnh Gas lnh: R22, R407C or R410A Cung cp: - Thit b gin n. - Ngt cao v thp p my nn. - u ni ng h p sut ng ht. - Van cch ly gia dn nng v lnh. - nh gi x tuyt / iu chnh nhit

c bu cm bin nhit (ch cho my hai chiu).

Van o chiu gas lnh (ch cho my hai chiu).




3.2 ROOM AIRCONDITIONER SPLIT SYSTEMS

3.2 H THNG MY IU HA KHNG KH CC B

General Provide split room airconditioning systems including indoor supply air units, outdoor condensing sections, interconnecting refrigeration piping, insulation and operating and safety controls.

General Cung cp h thng my iu ha khng kh cc b bao gm dn nng v dn lnh, ng ng gas ni, cch nhit v iu khin hot ng v an ton

Ceiling mounted Slim Line duct type Type: Above ceiling type with duct connections. Provide proprietary filter and secondary drain pan under unit. The unit is to be of the slimline type to fit within the architectural requirements.

Dn lnh ni ng gi loai mnh Loi: gn bn trn trn ni ng gi. Cung cp lc gi v mng nc ngng pha di my. My l loi b dy nh ph hp vi yu cu ca nh kin trc.

Wall mounted (hiwall) indoor units Type: Slim line construction, with adjustable louvre blades to allow horizontal or 45 downward air discharge. Installation: Mount 100mm minimum below ceiling level.

My iu ho (dn lnh) treo tng Loi: Cu to mng, cnh hng gi iu chnh theo phng ngang hoc gi ra hng xung 45o Lp t: treo ti thiu cch trn 100mm

Ceiling mounted exposed indoor units Type: Indoor unit surface mounted or partially recessed into ceiling. Provide return air grille and filter, internal access and perimeter air distribution system.

Dn lnh treo di trn Loi: c treo hoc m mt phn trong trn. Bao gm ming gi hi, lc gi, ca thm, h thng phn phi gi vng

Control location Mount on wall to sense representative room temperature.

V tr iu khin Treo trn tng cm bin nhit i din cho phng

Outdoor units Type: Fully weatherproofed units suitable for outdoor operation, housing compressor, outdoor coil and main electric controls.

Dn nng Loi: hon ton chu c thi tit khi vn hnh ngoi tri, v bc my nn, dn coil ngng v iu khin cp in.

3.3 ROOM AIRCONDITIONER CONTROLS

3.3 IU KHIN MY LNH CC B

Selector switch control Provide selector switches on the unit for the following functions: - FAN: Runs fan only. - COOL: Runs fan and forces cooling to

operate continuously. - HEAT: Runs fan and forces heating to

operate continuously. - AUTO: Runs fan and thermostatically

controls heating or cooling. - OFF: All functions off.

iu khin cng tc v tr Cung cp cng tc v tr cho my theo cc chc nng sau: - Qut: ch ch chy qut - Lm lnh: qut v lm lnh vn hnh

lin tc. - Si: qut v si vn hnh lin tc - T ng: qut v iu khin nh

nhit lm lnh hoc si - Tt: tt tt c cc hot ng

Microprocessor control Provide microprocessor controller with the following functions: - ON/OFF switch. - Evaporator fan speed selector switch.

Minimum of three speeds - Timer selector switches (Time on,

Time off, no timer control). Time

iu khin bng b vi x l Cung cp b iu khin vi x l theo cc chc nng sau - Cng tc bt/tt - Cng tc v tr tc qut dn lnh.

Ti thiu 3 tc . - Cng tc v tr nh gi (nh gi bt, nh gi tt, khng nh gi) Thi




switch adjustable in hourly increments up to 12 hours.

- Mode selector switch: COOL - HEAT - AUTO.

- Indicating lamps, LEDs or LCD display for:

. Unit operating.

. Filter clean reminder.

gian iu chnh cng tc hng gi trong vng 12 gi

- Cc ch trn cng tc v tr: Lm lnh - Si -T ng

- n ch th, n LED hoc mn hnh tinh th lng cho:

. My ang hot ng

. Nhc nh v sinh lc gi

3.4 PACKAGE AIRCONDITIONER GENERAL

Operating conditions Provide equipment that operates within an ambient temperature range of 0C to 45C, without excessive head pressure, unstable operation or icing. Split systems Outdoor units: Provide packaged condensing units consisting of refrigerant condensers, compressors and associated piping and electrical connections, mounted within the condenser enclosure. Indoor units: Provide units consisting of coils, piping, supply air fan, accessories and electrical connections, mounted within an insulated enclosure. Filters Filters: Type A, B or C to AS 1324.1 with performance to AS 1324.2 as follows: Test Dust No. 1: 20% efficiency. Test Dust No. 4: 85% arrestance.

3.4 MY IU HO HAI MNH TNG QUT

iu kin lm vic Cung cp thit b hot ng trong khong nhit mi trng t 0C n 45C, khng b qu p, hot ng khng n nh hoc b ng . H thng hai mnh Dn nng: Cung cp dn nng bao gm dn ngng mi cht lnh, my nn v h thng ng ng cn thit, cc u ni in, g lp bn trong v bao che dn ngng. Dn lnh: Cung cp dn lnh bao gm dn coil, ng ng, qut cp gi, v cc u ni in, g lp bn trong mt v bao che cch nhit. Lc gi Lc gi: Chng loi A, B hoc C theo AS 1324.1 c c tnh theo AS 1324.2 nh sau: Th nghim bi s 1: 20% hiu sut. Th nghim bi s 4: 85% gi li.

3.5 EQUIPMENT ENCLOSURES 3.5 V THIT B

General General: Provide enclosures, materials and finishes that are weatherproof and corrosion-resistant, assembled and reinforced to prevent flexing and drumming. Material and finishes Materials: - Metallic-coated steel: Base and legs

1.6 mm with 1.0 mm panels. - Aluminium: Base and legs 2.0 mm

with 1.6 mm panels. Outdoor equipment finishes: Powder coat all metallic-coated steel interior and exterior surfaces to AS 3715 or AS/NZS 4506 as appropriate, using APAS-0155/2. Indoor equipment finish: Manufacturers standard finish. Moisture retention: All parts free draining with no pockets in which condensation and/or rainwater may be

Tng qut Cung cp v bao che, vt liu v hon thin b mt chu c thi tit v chng n mn, lp rp v g chng bin dng v g p Vt liu v hon thin b mt Thp m kim loi: v chn: 1.6 mm vi tm: 1.0 mm Nhm: v chn: 2.0 mm vi tm: 1.6 mm Hon thin dn nng: Sn tnh in tt c b mt bn trong v b mt bn ngoi thp m kim loi theo AS 3715 hoc AS/NZS 4506, s dng APAS-0155/2. Hon thin dn lnh: theo tiu chun nh sn xut. S gi m: Tt c cc chi tit phi thot nc t do khng c ch ng nc c th nc ngng t hay nc ma b




retained. Access General: Provide access to the interior of the unit for routine inspection and maintenance and for removal of major components. Provide doors and panels with handles and captive fasteners and, where they are for access to the conditioned air stream, provide soft gaskets ensuring an airtight seal. Provide weatherproof doors and panels on outdoor enclosures. Do not use self tapping screws on removable panels. Access: As a minimum, provide access to the following: - Condensate tray (underside of access

panel to be within 300 mm of tray). - Supply fan motor and drive. - Compressor section. - Condenser section. - Filter section. Access panel fasteners: - Units < 1000 L/s: Metal thread screws

or camlock fasteners. - Units 1000 L/s: Camlock fasteners. Handles: Provide handles to permit easy and safe removal and replacement of panels. - < 450 mm diagonal panel dimension:

1 handle. - 450 mm diagonal panel dimension:

2 handles.

Insulation General: Insulate enclosures to prevent external surface condensation under all operating conditions. Fix insulation to panels with waterproof adhesive applied to at least 50% of the panel area. Material properties: - Thermal conductivity:

0.035 W/m.K. - Thickness: 25 mm. - Facing: Reinforced aluminium foil. - Moisture absorption: Non-

hygroscopic. - Fire hazard properties: To AS 4254 clause 2.7.1.

Condensate trays General: Provide a tray under each cooling coil extending downstream to collect water carry over and under any other components on which condensation may occur. Grade trays and sumps to the outlet to prevent water retention. Provide radiused corners and arrange to facilitate cleaning.

gi li. Tip cn Cung cp li tip cnvo bn trong my kim tra v bo tr, tho ri cc cu kin chnh. Cung cp ca v np c tay nm v kha nhanh nhng ni mun tip cn vo dng khng kh iu ha, cung cp m mm lm kn gi. Cung cp ca v np thm chu thi tit trn v bao che dn nng. Khng s dng vt t lm ren trn v tho ri Tip cn: Ti thiu, cung cp li tip cn nh sau: - Mng hng nc ngng t (mt di

ca tm thm phi khng xa hn 300mm t mng)

- Mt qut cp gi v phn dn ng. - My nn - Dn ngng - B lc Phng thc c nh np thm: - Thit b < 1000 L/s: Vis ren kim loi

hoc ci kp lch tm kiu kha cam. - Thit b 1000 L/s: ci kp lch tm

kiu kha cam. Tay cm: Cung cp tay cm d dng v an ton tho ri v thay th cc np thm. - ng cho < 450 mm: 1 tay. - ng cho 450 mm: 2 tay. Cch nhit Cch nhit cho v bao che ngn nga s ngng t xy ra trn b mt bn ngoi di mi ch hot ng. Lp cch nhit vo cc tm vi bng keo chng nc dn ti thiu 50% din tch tm. c tnh vt liu: - Tnh dn nhit: 0.035 W/m.K - Chiu dy: 25 mm. - B mt: Mng nhm c gia c. - S hp th hi m: khng ht m Ch s bt chy: theo AS 4254 khong 2.7.1 Mng hng ngng t Cung cp mt mng hng bn di mi dn coil lnh ko di ra thu ht nc mang sang v bn di cc chi tit c th xy ra ngng t. t mng v phu hng nghing dc v ph l thot ngn nga s ng vng. Cung cp cc gc c bo trn v lp rp sao cho d dng v sinh.




Material: Fabricate wetted parts from aluminium to AS/NZS 1734 or stainless steel sheet grade 304L. Protection General: Provide metallic coated steel mesh protection to outdoor fans and exposed faces of outdoor coils.

Vt liu: Gia cng cc chi tit t bng nhm theo AS/NZS 1734 hoc thp khng r mc 304L. Bo v Tng qut: cung cp li thp m kim loi bo v qut dn nng v mt bn ngoi ca dn giu nhit.

3.6 SUPPLY FAN 3.6 QUT DN LNH

Performance Performance: Select fans and fan motors so the air flow can be increased 5% above the specified design air flow rate, against the corresponding increased system resistance by fan speed change alone and without unstable operation. Fans with multi-speed motors: Select for required duty at second highest speed. Construction Forward curved impellers: Metallic-coated steel blades and wheel. Backward inclined impellers: Backward inclined, steel or extruded aluminium, aerofoil or single thickness blades, and non-overloading power characteristic. Casing: Metallic-coated steel sheet, riveted or spot-welded with joints sealed. Provide 1.2 mm minimum thickness scroll and 2 mm minimum thickness side plates. Bases: Formed from pressed metallic-coated steel sheets, bolted to casings. Provide at least 4 brackets for mounting. Inlet bells: Shaped for aerodynamically efficient air entry and small clearance from impeller. Shaft: Steel treated with solvent removable petroleum based protective coating. Bearings: Self-aligning sealed for life ball or roller type. Finish: Brush and prime spot welds with zinc-rich organic primer to APAS-2916. Drive Type: Direct or belt drive as scheduled in Selections. Direct drive: Multi speed or electronic variable speed. Belt drive: To suit a minimum 125% of motor power and capable of transmitting the full starting torque without slip. Provide adjustable motor pulley. Provide pulleys with shaft keys or taper lock bushes.

Hot ng Chn qut dng khng kh c th tng ln cao hn nh nc dng khng kh thit k, chu c tr lc h thng lin quan tng ln bng cch ch thay i tc qut v khng xy ra hot ng mt n nh. Qut s dng mt a tc: chn theo cng sut yu cu tc cao nht th hai. Cu to Cnh cong v pha trc: cnh v bnh m km cong v pha trc. Cnh nghing v pha sau: thp hay nhm c, nghing ra sau, cnh kiu my bay hoc bn n, v c c tnh cng sut khng b qu ti. V hp: thp tm trng km, bt rivet hoc hn bm c cc mi ni c lm kn. - Thp cn: dy ti thiu 1.2mm - Tm mt bn: dy ti thiu 2mm : c gia cng t thp tm trng km dp, bt bulon vo v. Cung cp ti thiu 4 chn cho g lp. Vm u vo: c hnh dng kh ng hc h tr gi vo v c khe h nh vi cnh. Trc: thp c x l bng lp ph bo v dng dung dch gc du c th lm sch c cho cc trc v chi tit my. trc: loi bi hoc a, t la, nim kn. Hon thin: Chi sch v sn lt nhng im hn bm bng sn lt hu c giu km theo APAS-2916. Dn ng Chng loi: trc tip hoc dng dy ai nh thit k. Dn ng trc tip: a tc hoc bin tc in t. Dn ng ai: c th p ng c ti thiu 125% cng sut mt v truyn momen quay khi ng y ti m khng b trt. S dng bnh ai trn mt loi iu chnh c. S dng bnh ai vi then trn trc hoc bc kha cn.




3.7 CONDENSER FANS 3.7 QUT DN NNG

Type Propeller fan: Direct drive with single thickness fixed pitch aluminium or UV protected polypropylene blades. Aerofoil axial flow fan: Direct drive with adjustable pitch aerofoil section blades of UV protected GRP or polypropylene, or aluminium. Centrifugal fan: - Drive: Direct or belt driven - Impeller: Forward curved or backward

inclined . Guards: Provide easily removable powder coat finished metallic coated steel guards over condenser fans.

Chng loi Qut kiu chong chng: dn ng trc tip c cnh nhm bc chia c nh bn n hoc polypropylene chu c tia cc tm. Qut kiu cnh my bay hng trc: cnh kiu my by c bc chia iu chnh, GRP hoc polypropylene chu c tia cc tm. Qut ly tm: cnh nghing ra sau hoc cong v trc dn ng trc tip hoc dy ai theo bng lit k. Cu to, dn ng v mc mt theo nh trong bng lit k. Truyn ng: trc tip hoc ai Dng cnh: cnh cong nghing v pha trc hoc sau Bo v: cung cp tm bo v bng thp m kim loi ph sn bt d tho ri bao che qut.

3.8 FAN MOTORS 3.8 NG C QUT

General Power rating of supply fans: At least the power required by the fan when the air flow is increased by 10% above the design air flow rate stated in the schedules, against the corresponding increased system resistance as installed. Single phase motors: 0.37 kW only. Speed: < 25 rev/s. Bearings: Sealed for life ball bearings. Minimum degree of protection: - Supply fans: IP54. - Condenser fans: IP55. Insulation to AS 1359.101: - Single phase motors: Minimum Class

B. - Three phase motors: Minimum Class

F.

Tng qut Mc cng sut: ti thiu bng cng sut yu cu ca qut khi lu lng khng kh tng ln 10% cao hn nc lu lng thit k trong bng lit k, chu c tr lc h thng tng ln lin quan khi lp t. Mt 1 pha: ch s dng 0.37 kW Tc : < 25 vng/giy. trc: bi nim kn. Cp bo v ti thiu: - Qut dn lnh: IP54 - Qut dn nng: IP55 Cch in: - Mt 1 pha: ti thiu lp B - Mt 3 pha: phn lp F

3.9 COMPRESSORS 3.9 MY NN

General Enclosure: Welded or accessible hermetic steel enclosure with 3 mounting feet. Provide the following: - Mounting: Vibration isolating

mountings. - Service valves: Packed and capped,

backseating refrigerant suction valve. - Charging connections: Schreader type

connections for evacuation and refrigerant charging.

Crankcase heaters: Provide integral positive temperature coefficient type

Tng qut V bao che: thp kn c th tip cn hoc hn c 3 chn lp, c cc chi tit sau: - Chn lp: loi cch ly rung ng - Van: van ht mi cht lnh ta sau ng gi v chp kn.

- u ni np gas: kiu Schreader rt chn khng v np gas.

in tr si hp cacte: cung cp tch hp in tr si hp cacte kiu h s




crankcase heaters if required for safe compressor operation.

nhit dng nu c yu cu cho hot ng ca my nn mi ch

3.10 COILS 3.10 DN COIL

Design Coil face velocity: 2.5 m/s. Fin pitch: 550 fins/m. Cooling coil air pressure drop: 150 Pa. Construction Tubes: Copper to AS/NZS 1571 or AS 1572 designation C12200. Fins: Aluminium alloy plate fins 0.12 mm thick to AS 2848.1, designation 3003 or 8011. Coil frames: - Aluminium alloy to AS 2848.1,

designation 5005. - Metallic-coated steel sheet coating

class Z275. Condenser coil: To provide at least 5 K subcooling. Access General: Arrange coils and casing so that both sides of coils are easily accessible for inspection and cleaning. Additional coil treatment General: If scheduled in Selections, protect condenser coil with factory applied air drying phenolic coating resistant to dilute acids, dilute alkalis, solvents, inorganic salts and salt laden air, if required in the schedule.

Thit k Tc b mt coil: 2.5 m/s Bc l tn nhit: 550 fins/m st p khng kh qua dn lnh: 150 Pa Cu to ng: ng ng theo tiu chun AS/NZS 1571 hoc AS 1572 phn C12200. L tn nhit: hp kim nhm dy 0.12 mm theo tiu chun AS 2848.1, phn 3003 hoc 8011. Khung dn coil: hp kim nhm theo AS 2848.1, phn 5005, hoc thp trng km, lp m G2/Z275. Dn ngng: cung cp s qu ngui ti thiu 5 K. Tip cn Lp t coil v v hp cho c hai mt ca coil c th d dng tip cn thc hin kim tra v bo tr. X l b sung cho dn coil Bo v dn ngng bng lp ph phenolic kh t nhin ti nh my, chu c axit long, kim long, cht ha tan, mui v c, khng kh c hi mui, nu c yu cu trong bng lit k.

3.11 WATER COOLED CONDENSERS

3.11 DN NGNG GII NHIT NC

General Water cooled condensers: - Mechanically cleanable type:

. Shell and tube type.

. Stainless steel plate type, bolted construction.

- Chemically cleanable type: . Stainless steel plate type, welded

construction. . Double pipe type.

Condenser water system strainer: Provide a strainer having mesh smaller than smallest passage in heat exchangers. Drains: Provide drains and vent valves at each condenser. Arrange to permit complete drainage of the water in the condenser. Water treatment: Provide condensers that will not face corrosion problems from

Tnq qut Bnh ngng gii nhit nc: - Loi lm sch c kh

. Loi ng nc nm ngang

. Loi tm bng thp khng r, kt cu bt bulng

- Loi lm sch bng ha cht: . Loi tm bng thp khng r,

kt cu hn. . Loi ng i.

Lc cho h thng nc ngng: Cung cp mt ci lc c li nh hn on nh nht ca b trao i nhit. ng thot: cung cp ng thot v van thng hi mi bnh ngng. Lp t cho php x hon ton nc trong bnh ngng. X l nc: cung cp bnh ngng khng gp phi vn n mn t ng ng nc chnh bit trc, v t




the anticipated local mains water, a nd from the same water used in open type cooling towers with the specified water treatment systems.

ng nc tng t dng trong cc thp gii nhit loi h vi h thng x l nc trn danh ngha.

3.12 REFRIGERATION SYSTEM 3.12 TC NHN LNH

Components Refrigerant: R22, R407C or R410A. Copper pipe: To AS/NZS 1571. Pipe insulation within unit: Insulate pipes that operate below ambient temperature with elastomeric foam 10 mm thick. Multiple compressor units: Provide separate refrigeration circuit for each compressor. Refrigerant expansion device: - < 20 kW total capacity: Eliminator or

similar, non-capillary expansion device, thermostatic expansion valve or electronic expansion valve.

- 20 kW total capacity: Thermostatic expansion valve or electronic expansion valve.

Refrigeration circuits: Provide each refrigeration circuit with a sight glass-moisture indicator, filter dryer and manual reset high pressure and auto reset low pressure cutouts. Provide a suction accumulator if compressor is liable to damage by liquid slugs.

Cu kin Mi cht lnh: R22, R407C hoc R410A. ng ng: theo AS/NZS 1571. Cch nhit cho ng bn trong thit b: Thc hin cch nhit cho ng hot ng nhit thp hn nhit mi trng bng bt cch nhit co gin dy 10 mm. Thit b c nhiu my nn: Cung cp mch lm lnh ring r cho mi my nn. - Kh c gin n mi cht lnh:

. Tng cng sut < 20 Kw: loi y hoc tng t, khng mao dn, van gin n nhit tnh hoc van gin n in t .

. Tng cng sut 20 Kw: van gin n nhit tnh hoc van gin n in t.

- Mch gas: knh quan st hi m cho tng mch gas, b lc kh, mch cutout t ng reset p sut thp v reset tay p sut cao.

Cung cp b tch ly ht nu my nn c th b h do ngp cht lng.

3.13 CONTROLS & ELECTRICAL 3.13 IU KHIN & CP IN

Components General: Provide factory wired control panel for each unit containing the following: - Plug-in relays. - Terminal strips numbered to

correspond to wiring diagram. - Starter and overload protection for

each motor. - Short circuit protection: Provide each

compressor and each 3-phase motor with short circuit protection by either . High rupture coefficient (HRC)

fuses or . Circuit breaker with adequate

interrupting capacity. . Starter contactor with manual reset

thermal or magnetic overload. - Provide automatic lead/lag

changeover for units with multiple compressors.

Cu kin Cung cp t in iu khin u dy ti nh my cho tng thit b c cc chi tit sau: - Rle kiu n vo - Trm u ni c nh s tng ng

vi s u dy. - B khi ng v bo v chng qu

ti cho mi mt. - Bo v ngn mch: trang b bo v

ngn mch cho mi my nn v mt 3 pha bng . Cu ch c h s ct cao (HRC) . CB c cng sut ngt thch hp . Cu dao t ng v contactor c

nt reset tay cho qu ti nhit hoc t.

- Trang b b chuyn i trc/sau t ng cho thit b c nhiu my nn.

- Chc nng nh gi chu k khi ng ngn: gii hn s ln khi ng my nn.




- Short cycle timer function: To limit compressor starts.

- Separate control and electrical circuit for each compressor.

- HRC fuse or circuit breaker short circuit protection for each crankcase heater (if fitted) and control circuit.

- Phase failure protection on motors 5.5 kW.

- Terminals for remote indication of run and fault conditions.

- Permanent, weatherproof, wiring diagram fixed on or next to the control panel.

Safety controls: Arrange so that operation of one item does not shut down other items that are not directly dependent on its operation. Isolating switch: Provide system isolator to AS/NZS 3000 for each system. Condenser head pressure control: If scheduled in Selections, provide electronic condenser fan speed control to maintain minimum condenser head pressure at all operating ambient conditions. Pump-down control: If scheduled in Selections, provide solenoid valve and automatic pump-down control.

- Phn tch mch iu khin v mch ng lc cho mi my nn.

- Cu ch HRC hoc cu dao t ng bo v ngn mch cho mi in tr si cacte (nu c trang b) v mch iu khin.

- Bo v chng mt pha cho ng c 5.5 kW.

- Trm u ni cho ch th t xa cc trng thi chy v bo s c.

- S u dy thng trc, chu thi tit, gn trn hay bn cnh t in iu khin.

Kim sot an ton: Lp t sao cho hot ng ca mt thit b khng lm tt cc thit b khc m khng trc tip ph thuc vo hot ng ca n. Thit b ngt in: trang b thit b ngt in cho mi h thng theo tiu chun AS/NZS 3000. Kim sot ct p dn ngng: nu c thit k, trang b b iu khin tc qut dn ngng dng in t duy tr ct p dn ngng thp nht mi iu kin mi trng vn hnh. Kim sot bm: Nu c thit k, trang b van iu khin in v iu khin t ng qu trnh bm.

4 EXECUTION 4 LP T

4.1 REFRIGERATION PIPEWORK 4.1 NG NG LNH

General Conform to equipment manufacturers recommendations for the refrigerant used.

Tng qut Tun th yu cu ca nh sn xut v mi cht lnh s dng.

Design Suction lines: Size for pressure drop




capacity under the operating temperatures stated in the schedules.

nhit vn hnh thit k.

Layout Install pipework in straight lines and uniform grades without sags. Grade horizontal hot gas lines and suction lines at not less than 1 in 200 in the direction of gas flow. Location: When possible, run suction and liquid lines inside common insulation.

B tr Lp t ng ng trn ng thng v dc u khng b vng. (t nghing ng ng gas nng trn phng ngang v ng ht khng t hn 1:200 theo chiu dng gas. V tr: khi kh thi, t ng ht v ng cht lng bn trong lp cch nhit thng thng.

Pipe support Provide hangers, brackets, saddles, clips, etc., incorporating provisions for adjustment of spacing, alignment, grading and load distribution. Support pipework from associated equipment or building structure. Support valves, strainers and major line fittings so that no load is placed on adjacent tubes or transmitted to them during operation and maintenance. Support type: Proprietary galvanized channel section with clamps and hangers sized match external diameter of pipe being supported. Uninsulated pipes: Clamp piping supports directly to pipes. Insulated pipe support: - Spacers: Provide spacers at least as

thick as the insulation between piping supports and pipes. Extend either side of the support by at least 20 mm.

- Spacer material: Rigid insulation material of sufficient strength to support the piping and suitable for the temperature application.

- Vapour barriers: For cold pipes apply aluminium foil tape over the circumference of the spacer to form a vapour barrier.

- Metal sheathing: Provide a 0.55mm thick zinc-coated steel band between the aluminium foil tape and the support, for the full width of the spacer.

Treo ng Trang b mc treo, bt treo, bt ch u, kp, kt hp cc trang b iu chnh khong cch, s ng trc, dc v phn b ti. Treo ng t cc thit b ph tr hoc t kt cu xy dng. Treo van, lc Y v cc ph kin ng ng chnh yu cho khng c ti tc ng ln ng k cn hoc lan truyn n ng trong khi vn hnh v bo tr. Chng loi thanh treo : thp hnh trng km mua sn c kp v mc c kch thc tng xng vi ng knh ngoi ca ng c treo . ng khng cch nhit: Kp chi tit treo trc tip ln ng. Treo ng cch nhit: - Ming m: lp t ming m ti

thiu dy bng lp cch nhit gia chi tit treo ng v ng. Ko di ra hai bn ca chi tit ti thiu 20mm.

- Vt liu ca lp m: vt liu cch nhit cng chu ni ng v ph hp vi nhit s dng.

- Lp ngn m: i vi ng lnh, s dng bng keo mng nhm dn ln ton b chu vi ca ming m to thnh lp ngn m.

- V bc kim loi: Cung cp di thp m km dy 0,55mm gia lp bng keo mng nhm v chi tit treo , trn ton b chiu rng ca ming m.

Pipe support spacing table Bng khong cch gia cc chi tit treo ng

Maximum spacing (m) / Khong cch ti a (m) Nominal pipe size, DN Kch thc danh nh ng Horizontal/ Phng ngang Vertical/ Phng ng

10 1 2




Maximum spacing (m) / Khong cch ti a (m) Nominal pipe size, DN Kch thc danh nh ng Horizontal/ Phng ngang Vertical/ Phng ng

15, 20 1.5 2.5 25 2 3 32 2.5 3 40 2.5 4 50 3 4 65 3 4

Pipes Standard: To AS/NZS 1571. Temper designation: H temper. 0 temper may be used for pipes < DN 25 or for pulled bends or flared joints. Pipe wall thickness: - Pipes DN50: To AS1432 Type B. - Pipes > DN50: 1.6 mm, minimum. Deemed to comply for split systems under 7.5kW cooling capacity: Split system manufacturers standard pre-charged piping kit.

ng Tiu chun: theo tiu chun AS/NZS 1571 ti: H. 0 c th s dng cho ng < DN 25 hoc ng ko cong hoc mi ni l u. Chiu dy ng: - ng DN 50: theo AS 1432 Type B. - ng > DN 50: 1.6 mm, ti thiu. Cho h thng hai mnh di 7,5kW cng sut lnh: h ng np trc theo tiu chun nh sn xut h thng hai mnh.

Bends Pulled bends: Form bends without flattening or wrinkling using the correct tool size for the pipe diameter. Minimum inside radius: 3 pipe diameters.

ng cong Ko cong ng: to ng cong m khng lm phng ng hay gp ng bng cch s dng dng c c kch thc ng vi kch thc ng. Bn knh trong ti thiu: 3 ln ng knh ng.

Pipe fittings Copper alloy fittings: To AS 3688, dezincification resistant, welded, brazed or compression type only. Preformed fittings: Preformed refrigerant capillary line tees, bushes, couplings and elbows. Wherever possible make reductions at elbows, tees, line devices or equipment connections with reducing fittings, otherwise provide reducing bushes or reducing couplings. Compression fittings: Flareless twin ferrule, torque free, mechanical grip fittings which can be gauged using a precision ground and hardened metal gap inspection gauge.

Ph kin ng ng Ph kin hp kim ng; theo tiu chun AS 3688, khng b oxy ho kh km, hn, hoc dp. Ph kin to hnh trc: S dng ng ba, ng lt, khp ni v khy ng mao dn mi cht lnh to hnh trc. Ni no c th gim khy, ng 3, thit b ng ng hoc u ni thit b bng ph kin gim, ngoi ra th s dng ng lt hoc khp ni gim. Ph kin dp nn: ph kin hai u khng l, khng xon, cn rnh c th o bng dng c o chnh xc v b dng kim tra khe h lm bng kim loi cng.

Brazed joints General: Provide preformed capillary fittings or form capillary unions by expanding one pipe end. Prevent flux and brazing alloy from entering pipes. Use dry nitrogen to purge air from pipes before brazing. During brazing, maintain a flow of dry nitrogen through pipes to prevent oxidation. Brazing alloy: To AS 1167.1 Table 2 B4.

Hn thau Tng qut: S dng ph kin mao dn to hnh trc hoc racco mao dn phnh rng mt u ng. Ngn nga cht gy chy v hp kim hn i vo trong ng. S dng nitrogen kh kh gi trong ng trc khi hn. Trong qu trnh hn, duy tr lung kh nitrogen kh trong ng ngn nga s oxy ha. Hp kim hn: theo tiu chun AS 1167.1 Table 2 B4. cha ti thiu




15% min silver content. Brazing alloy for jointing dissimilar metals: To AS 1167.1 Table 1 A10. or an alloy with an equivalent silver content (minimum 34%).

15% bc. Hp kim hn cc kim loi khng ng nht: theo AS 1167.1 Table 1 A10. hoc hp kim c thnh phn bc tng ng (ti thiu 34%).

Sleeves Provide pipe sleeves where pipes pass through building elements. Material: Copper or UPVC formed from pipe sections. Do not use UPVC for fire rated penetrations. Sleeve thickness: - Metal: 1mm. - uPVC: 3mm.

ng lt Lp t ng lt cho ng ni i ngang qua cc kt cu xy dng. Vt liu: ng hoc uPVC lm t cc phn ca ng. Khng s dng uPVC cho cc l xuyn ngn chy. Chiu dy ng lt: - Kim loi: 1 mm. - uPVC: 3 mm.

Valves Provide valves of the type and in the location recommended by SAA HB40.1.

Van Cung cp van c chng loi v v tr lp t theo cc yu cu trong SAA HB40.1.

Valve types Service valves: Backseating type with gasketed cap. Solenoid line valves: Solenoid coil and valve parts replaceable without disturbing valve body or refrigerant piping.

Chng loi van Van cng tc: kiu ta sau c chp m. Van iu khin in lp trn ng: cun dy v cc b phn ca van c th c thay th m khng cn tho lp thn van hay ng ng mi cht lnh.

4.2 CONDENSATE DRAINS 4.2 THOT NC NGNG T

General Condensate drains: Provide trapped drain lines to connect condensate trays to the nearest building drain point. Trap depth: To withstand > 2 times the fan static pressure or 50mm whichever is the greater. Provide drains from: - Each indoor coil. - Each outdoor coil unless casing freely

drains to a roof or other location where condensate and/or rain water will not cause damage or pond.

- Each safety tray. - Other moisture and rainwater

collecting areas. Size: The greater of unit drain connection size and DN 20. Fall: Provide drains with uniform and continuous fall. Sealing: Seal drain pipes where they penetrate casing. Test: Test drains by pouring a measured quantity of water into upstream end.

Tng qut ng thot nc: Lp t ng thot c xiphone ni mng hng n im thot nc gn nht ca to nh. Chiu su by xiphone: chu c > 2 ln p lc qut tnh hoc 50mm tu theo ci no ln hn. Lp t ng thot cho: - mi dn coil lnh. - mi dn coil nng tr khi thot t

nhin ra mi nh hoc v tr m nc thot v/ hoc nc ma khng gy h hng hoc ng vng.

- mi mng an ton. - cc khu vc thu nc ma v hi m. Kch thc: ci ln hn ca l thot thit b v DN20. dc: nghing u v lin tc. Lm kn: nim kn ng thot ni i ngang qua v my. Th nghim: th nghim ng thot bng cch mt lng nc xc nh vo u trn.

Material Copper: To AS 1432 Type B UPVC: To AS/NZS 1477, installed to AS 2032. Trap material: Transparent, kink

Vt liu ng: theo AS 1432 Type B UPVC: theo AS/NZS 1477, lp t theo tiu chun AS 2032. Vt liu by nc: trong sut, ng




resistant hose. chng xon.

4.3 SAFETY TRAY 4.3 MNG AN TON

Location Provide a safety tray under indoor unit of split systems if leaks or condensation from these could cause nuisance or damage to the building or its contents.

V tr Lp t mng an ton bn di dn lnh nu r r hoc ngng t t dn lnh c th gy phin toi hoc h hng cho to nh hay cc c bn trong.

Construction Galvanized steel sheet, 1.2 mm thick folded and stiffened, edges turned over and with all joints sealed. Sides 50mm high. Size: Extend tray 150mm beyond unit casing and any components that may leak or drip condensation. Drainage: Provide fall in tray and provide drain at lowest point. Run drain to visible waste.

Cu to Thp trng km, dy 1,2mm gp m, c gn tng cng v cc mi ni c lm kn. Cnh cao 50 mm. Kch thc: Lm mng rng hn 150mm t dn lnh v cc cu kin c th r r hoc nhu nc ngng t. Thot nc: Lp t mng dc v l thot. Lp t ng thot n im thot nc thi h, nhn thy.

4.4 REFRIGERATION PIPE INSULATION

4.4 CCH NHIT CHO NG NG LNH

Material Thickness: - Pipes DN 20: 13mm. - Pipes > DN 20: 19mm. Type: Chemically blown closed cell nitrile rubber in tubular form. Standard: To ASTM C534. Physical properties: - Maximum thermal conductivity: 0.04

W/mK at 0C. - Moisture absorption: Non-

hygroscopic. - Water vapour permeability:

0.065ng/Pa.m.s. - Early fire hazard indices:

. Spread of flame index: 0.

. Smoke developed index: 3 (maximum).

Adhesive: Use only adhesive supplied by the insulation manufacturer.

Vt liu Chiu dy: - ng DN 20: 13 mm. - ng > DN 20: 19 mm. Chng loi: cao su nitrile ng kn thi ho cht dng ng.. Tiu chun: theo ASTM C534. Tnh cht vt l: - dn nhit ti a: 0.04 W/mK

0C. - ht nc ng: khng hp th. - ht hi nc: 0.065 ng/Pa.m.s. - Ch s nguy chy sm:

. Ch s chy lan: 0.

. Ch s to khi: 3 (ti a). Keo dn: ch s dng keo dn cung cp bi nh sn xut cht cch nhit.

Protection Insulation exposed to sunlight and mechanical damage: Provide 0.6mm zincanneal or 0.8mm aluminium sheathing or run pipes in 0.8mm metal trunking. Insulation exposed to sunlight but not the risk of mechanical damage: Provide metal sheathing or trunking, or apply 2 coats of UV resistant paint supplied or recommended by the insulation manufacturer.

Bo v Cch nhit l ra di nh nng v d b va chm c hc: km cng 0,6mm hoc v bc nhm 0,8mm hoc t bn trong mng kim loi dy 0,8mm Cch nhit l thin nhng khng b va chm c hc: s dng v bc kim loi hoc mng cha, hoc qut 2 lp sn chng tia cc tm c cung cp hoc yu cu bi nh sn xut cch nhit.

Installation Insulate all refrigerant piping that may sweat. Apply insulation un-slit where possible. If slit, refix slit faces with

Lp t Thc hin cch nhit cho tt c cc ng ng mi cht lnh c th b ng sng. Khng rch ng cch nhit ni




adhesive applied to full area. Timing: Leak test piping before insulating joints, fittings and valves.

kh thi. Nu phi rch ng cch nhit, dn kn b mt rch bng keo dn ton b b mt rch. Thi im: th nghim r r ng trc khi bc cch nhit mi ni, ph kin v van.

4.5 UNIT INSTALLATION 4.5 LP T THIT B

General Supply all necessary components, including but not limited to: - Means of attachment to the structure. - Anti-vibration mounting. - Appropriate flexible connections. - Trim and sealing around openings. - Electrical connections. - Drainage connections. - Field connection of refrigerant lines in

split systems. Alignment: Install units level, plumb and to manufacturers recommendations. Falls: Check that the condensate tray falls comply with AS/NZS 3666.1 and in particular that trays and sumps are graded to the outlet to prevent moisture retention.

Tng qut Cung cp tt c cc ph kin cn thit, bao gm nhng khng b gii hn bi: Cc chi tit cn thit g lp ln kt cu xy dng. Chn chng rung Cc u ni mm. Ch vin v cht trt kn xung quanh cc l. u ni in u ni thot nc u ni ng mi cht lnh cho h thng hai mnh. dc: Kim tra rng mng hng nghing theo tiu chun AS/NZS 3666.1 v c bit l mng v v nging v pha l thot ngn nga nc ng.

Outdoor equipment Provide clearance around units for condenser air flow and maintenance access. Ensure discharge air does not short-circuit to condenser intake.

Thit b t ngoi tri Lp t thit b c khong trng xung quanh cho lung khng kh thi vo dn ngng v tip cn cho bo tr. m bo rng kh thi ra khng b hi ngc v u vo dn ngng.

Duct connections Supply duct: Provide internal or external flexible duct connection. Comply with the Flexible connections clause in the Ductwork worksection. Return, outside air and condenser duct connections: Provide external flexible duct connection.

u ni ng gi ng gi cp: S dng ng gi mm ni bn trong hoc bn ngoi. Tun th phn u ni mm trong chng ng gi. ng gi hi, gi ti v dn ngng: s dng ng gi mm ni bn ngoi.

Vibration isolation Suspended units: Metal spring or rubber-in-shear isolation mountings with 25mm static deflection and 98% isolation efficiency. Floor mounted units: Neoprene waffle pads.

Cch ly rung ng Thit b treo: L xo kim loi hoc chn cao su chu ko cch ly vi vng tnh 25 mm v hiu sut cch ly 98%. Thit b lp sn: tm lt neoprene kiu t ong.

Fixings Bolt units in place with minimum 4 anchors or suspension rods.

G lp Bt bulon thit b vo v tr bng t nht 4 bulon neo hoc thanh treo.

4.6 COMMISSIONING 4.6 CHY TH & NGHIM THU

General Packaged equipment: Common to the manufacturer's recommendations and record results.

Tng qut Thit b nguyn b: ni chung theo yu cu ca nh sn xut v kt qu ghi nhn




Refrigeration systems: Conform to the recommendations of SAA HB40.1.

H thng gas lnh: ph hp theo khuyn co ca SAA HB40.1.

B.22 Packaged Airconditioning - VN - Centrepoint

Documents

Transcript of B.22 Packaged Airconditioning - VN - Centrepoint