Svc 12acb 0195 - Heating And Air Parts
12ACBCorp. 9503 L1Revised 01 2002Service Literature12ACB SERIES UNITSThe 12ACB is a residential split"system condensingunit. The series is designed for use with expansion valves(TXV). All 12ACB units utilize scroll compressors.Information contained in this manual is intended for use byqualified service technicians only. All specifications are subjectto change.This manual is divided into sections which discuss themajor components, refrigerant system, charging proce"dure, maintenance and operation sequence.I U NIT INFORMATION12ACB condensing units are available in 2, 2 "1/2, 3, 3 "1/2, 4and 5 ton capacities. All major components (indoor blowerand coil) must be matched according to Lennox recommen"dations for the compressor to be covered under warranty.Refer to the Engineering Handbook for approved systemmatchups.SPECIFICATIONSModel No.12ACB2412ACB3012ACB36Outer coil 1 8 15.21 (1.41) 2 8 5.11 (1.40) 1 8 15.21 (1.41) 2 8 15.11 (1.40) 1 8 15.21 (1.41) 2 8 15.11 (1.40)Inner coil 1 8 5.44 (0.51) 2 8 5.40 (0.50) 1 8 14.50 (1.35) 2 8 14.40 (1.33) 1 8 14.50 (1.35) 2 8 14.40 (1.33)5/16 (8) 8 1.375/16 (8) 8 25/16 (8) 8 222 (866)22 (866)22 (866)18 (457) 8 318 (457) 8 418 (457) 8 41/6 (124)1/6 (124)1/6 (124)2500 (1180)2450 (1155)2450 (1155)Rpm110011001100Watts200200200 1 8 5 lbs. 8 oz. (2.49 kg) 28 5 lbs. 0 oz. (2.26 kg) 1 8 7 lbs. 3 oz. (3.26 kg) 2 8 6 lbs. 8 oz. (2.95 kg) 1 8 7 lbs. 4 oz. (3.29 kg) 2 8 6 lbs. 10 oz. (3.0 kg)Liquid line 8 in. (mm) o.d. connection (sweat)3/8 (9.5)3/8 (9.5)3/8 (9.5)Suction line 8 in. (mm) o.d. connection (sweat)3/4 (19.1)3/4 (19.1)7/8 (22.2)Shipping weight 8 lbs. (kg) 1 package155 (70)175 (79)180 (187)Net face area " sq.sq ft.ft (m2)CondenserCoilTube diameter 8 in. (mm) & no. of rowsFins per inch (m)Diameter 8 in. (mm) & no. of bladesMotor hp (W)CondenserFanCfm (L/s)*Refrigerant charge furnished (HCFC"22)*Refrigerant charge sufficient for 25 ft. (7.6 m) length of refrigerant lines.Page 1 1996 Lennox Industries Inc.
SPECIFICATIONS (continued)Model No.12ACB4212ACB4812ACB60Outer coil-1 Ċ 15.21 (1.41)-2 Ċ 15.11 (1.40)21.11 (1.96)21.11 (1.96)Inner coil-1 Ċ 14.50 (1.35)-2 Ċ 14.40 (1.33)20.31 (1.89)20.31 (1.89)5/16 (8) Ċ 25/16 (8) Ċ 25/16 (8) Ċ 222 (866)22 (866)22 (866)18 (457) Ċ 422 (559) Ċ 422 (559) Ċ 41/3 (249)1/3 (249)1/3 (249)2930 (1385)3890 (1835)3890 (1835)Rpm110010851085Watts310375375-1 Ċ 7 lbs. 11 oz. (3.49 kg)-2 Ċ 8 lbs. 0 oz. (3.6 kg)10 lbs. 14 oz. (4.93 kg)11 lbs. 0 oz. (4.99 kg)Liquid line Ċ in. (mm) o.d. connection (sweat)3/8 (9.5)3/8 (9.5)3/8 (9.5)Suction line Ċ in. (mm) o.d. connection (sweat)7/8 (22.2)7/8 (22.2)1Ć1/8 (28.6)Shipping weight Ċ lbs. (kg) 1 package186 (84)250 (113)254 (115)Net face area Ć sq.sq ft.ft (m2)CondenserCoilTube diameter Ċ in. (mm) & no. of rowsFins per inch (m)Diameter Ċ in. (mm) & no. of bladesMotor hp (W)CondenserFanCfm (L/s)*Refrigerant charge furnished (HCFCĆ22)*Refrigerant charge sufficient for 25 ft. (7.6 m) length of refrigerant lines.ELECTRICAL DATAModel 208/230v1phRated load amps10.313.515.418.023.728.9Power factor.96.96.96.95.96.96Locked rotor amps56.072.588.0104.0129.0169.0Full load amps1.11.11.11.91.91.9Locked rotor 31.538.0Line voltage data Ċ 60 hzCompressorCondenser CoilFan MotorRec. maximum fuse or circuit breaker size (amps)*Minimum circuit ampacity*Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.NOTE Ċ Extremes of operating range are plus 10% and minus 5% of line voltage.Page 2
II U NIT COMPONENTS1 Compressor Contactor K1Unit components are illustrated in figure 1.The compressor is energized by a contactor located in thecontrol box. See figure 2. Single pole and two"pole con"tactors are used in 12ACB series units. See wiring dia"grams for specific unit. K1 is energized by the indoor ther"mostat terminal Y1 (24V) when thermostat demand ispresent.12ACB UNIT COMPONENTSOUTDOORFAN/MOTORCONTROLBOXDANGERShock HazardSome 12ACB units use single8polecontactors. One leg of compres8sor, capacitor and condenser fanare connected to line voltage at alltimes. Potential exists for electri8cal shock resulting in injury ordeath. Remove all power at dis8connect before servicing.Can cause personal injury or death.SUCTIONLINESUCTION LINESERVICE VALVECOMPRESSOR2 D ual Capacitor C12The compressor and fan in 12ACB series units use per"manent split capacitor motors. The capacitor is locatedinside the unit control box (see figure 2). A single Gdual"capacitor (C12) is used for both the fan motor and thecompressor (see unit wiring diagram). The fan side andthe compressor side of the capacitor have differentMFD ratings. See table 1 for dual capacitor ratings.TABLE 1LIQUID LINESERVICE VALVEDISCHARGE LINEFIGURE 112ACB UNIT CONTROL BOXDUAL CAPACITOR(C12)12ACB (C12) DUAL CAPACITOR B60HERM80UnitCOMPRESSORCONTACTOR(K1)TIMED OFFCONTROL. (TOC)EARLY MODEL12ACB UNITSONLYGROUNDINGLUGVAC3703 T imed Off Control TOCFIGURE 2A Control Box (Figure 2)12ACB units are not equipped with a 24V transformer. All24 VAC controls are powered by the indoor unit. Refer towiring diagram.Electrical openings are provided under the control box cov"er. Field thermostat wiring is made to color"coded pigtailconnections.12ACB models built prior to July1996, are equipped with atimed off control. The time delay is electrically connectedbetween thermostat terminal Y and the compressor con"tactor. Between cycles, the compressor contactor isdelayed for 5 minutes 2 minutes. At the end of the delay,the compressor is allowed to energize. When thermostatdemand is satisfied, the time delay opens the circuit to thecompressor contactor coil and the compressor is de ener"gized.Without the time delay it would be possible to short cyclethe compressor. A scroll compressor, when short cycled,can run backward if head pressure is still high. It does notharm a scroll compressor to run backward, but it couldcause a nuisance tripout of safety limits (internal overload).For this reason, if a TOC delay should fail, it must be re"Page 3
placed. Do not bypass the control. Later model scroll com"pressors have an arrest feature which eliminates the needfor the TOC. The arrest feature is internaly built and me"chanically prevents the compressor from turning back"wards.SCROLL FORMDANGERDO NOT ATTEMPT TO REPAIR THIS CONTROL. UN8SAFE OPERATION WILL RESULT. IF THE CONTROLIS FOUND TO BE INOPERATIVE, SIMPLY REPLACETHE ENTIRE CONTROL.FIGURE 4B C ompressorCROSS SECTION OF SCROLLSSCROLL COMPRESSORDISCHARGESTATIONARY SCROLLDISCHARGEPRESSUREDISCHARGESUCTIONSUCTIONTIPS SEALED BYDISCHARGE PRESSUREORBITING SCROLLFIGURE 5FIGURE 3All 12ACB units utilize a scroll compressor. The scroll com"pressor design is simple, efficient and requires few movingparts. A cutaway diagram of the scroll compressor is shown infigure 3. The scrolls are located in the top of the compressorcan and the motor is located just below. The oil level is imme"diately below the motor.The scroll is a simple compression concept centered aroundthe unique spiral shape of the scroll and its inherent properties.Figure 4 shows the basic scroll form. Two identical scrolls aremated together forming concentric spiral shapes (figure 5).One scroll remains stationary, while the other is allowed to "or"bit" (figure 6). Note that the orbiting scroll does not rotate orturn but merely orbits the stationary scroll.NOTE During operation, the head of a scroll compressormay be hot since it is in constant contact with discharge gas.The counterclockwise orbiting scroll draws gas into the outercrescent shaped gas pocket created by the two scrolls (figure6 1). The centrifugal action of the orbiting scroll seals off theflanks of the scrolls (figure 6 2). As the orbiting motion contin"ues, the gas is forced toward the center of the scroll and thegas pocket becomes compressed (figure 6 3). When thecompressed gas reaches the center, it is discharged verticallyinto a chamber and discharge port in the top of the compres"sor (figure 5). The discharge pressure forcing down on the topscroll helps seal off the upper and lower edges (tips) of thescrolls (figure 5). During a single orbit, several pockets of gasare compressed simultaneously providing smooth continuouscompression.The scroll compressor is tolerant to the effects of liquid return.If liquid enters the scrolls, the orbiting scroll is allowed to sepa"rate from the stationary scroll. The liquid is worked toward thecenter of the scroll and is discharged. If the compressor is re"placed, conventional Lennox cleanup practices must be used.Page 4
SUCTIONSUCTION1INTERMEDIATE PRESSUREGAS2ORBITING SCROLLCRECENT SHAPEDGAS POCKETSTATIONARY SCROLLSUCTIONPOCKETFLANKS SEALEDBY CENTRIFIGUALFORCESUCTIONSUCTIONMOVEMENT OF ORBIT34HIGH PRESURE GASDISCHARGEPOCKETFIGURE 6Due to its efficiency, the scroll compressor is capable ofbly. See figure 7. The condenser fan motor is removedfrom the fan guard by removing the four nuts found ondrawing a much deeper vacuum than reciprocating com"pressors. Deep vacuum operation can cause internalthe top panel. Drip loops should be used in wiring whenservicing motor. See figure 8 if condenser fan motor re"fusite arcing resulting in damaged internal parts and willplacement is necessary.result in compressor failure. Never use a scroll com"pressor for evacuating or Gpumping down" the system.This type of damage can be detected and will result indenial of warranty claims.Make sure all power is disconnected beforeTable 2 shows the specifications of compressors used inbeginning electrical service procedures.12ACB series units.DANGERTABLE 2Unit12ACB2412ACB3012ACB3612ACB4212ACB COMPRESSOR SPECIFICATIONSMAN/MODEL Voltage Phase LRA RLA Oil fl.oz.COP/ZR22K3 PFV 208/230COP/ZR28K3 PFV 208/230COP/ZR34K3 PFV 208/230COP/ZR40K3 PFV 208/230COP/ZR46K3 PFV 208/23012ACB4812ACB60 COP/ZR57K3 PFV 208/230383842111156738810410.313.515.418.04211129 23.7169 28.95750CONDENSER FAN MOTORAND COMPRESSOR ACCESSFAN GUARDRemove (7) screwsFANMOTORThe scroll compressor is quieter than a reciprocating com"pressor, however, the two compressors have much differentsound characteristics. The sounds made by a scroll com"pressor do not affect system reliability, performance, or indi"cate damage.C Condenser Fan MotorWIRINGRACEWAYRemove (4) nutsREMOVE (7) SCREWSSECURING FAN GUARD.REMOVE FAN GUARD/FANASSEMBLY.FIGURE 7All units use single phase PSC fan motors which require a runcapacitor. In all units, the condenser fan is controlled bythe compressor contactor.ELECTRICAL DATA tables in this manual show specifi"cations for condenser fans used in 12ACBs.Access to the condenser fan motor on all units is gainedby removing the seven screws securing the fan assem"Page 5ALIGN FAN HUB FLUSH WITH END OF SHAFTFIGURE 8
III - REFRIGERANT SYSTEMDANGERA - PlumbingField refrigerant piping consists of liquid and suction linesfrom the condensing unit (sweat connections) to the indoorevaporator coil (flare or sweat connections). Use LennoxL10 (flare) or L15 (sweat) series line sets as shown intable 1.TABLE 1CondensingUnitModel No.12ACB2412ACB3012ACB3612ACB4212ACB4812ACB60Line SetModel No.(L10 orL15)Length bleLiquid LineOutside Dia.mmin.mm3/8959.53/419To Close Liquid or Suction Line Service Valve:1 - Remove stem cap with an adjustable wrench.Suction LineOutside Dia.in.Do not attempt to backseat this valve. Attempts tobackseat this valve will cause snap ring to explodefrom valve body under pressure of refrigerant.Personal injury and unit damage will result.2 - Using service wrench and 5/16" hex head extension, turnstem clockwise to seat the valve. Tighten firmly.3 - Replace stem cap. Tighten finger tight, then tighten anadditional 1/6 turn.LIQUID LINE SERVICE VALVE (VALVE OPEN)12INSERT HEXWRENCH HERESTEM CAPSERVICEPORTOUTLET(TO TCAP*Field fabricate.The liquid and suction line service valves (figures 9 and 10)and gauge ports are accessible from outside the unit.The valve is equipped with a service port. The service portsare used for leak testing, evacuating, charging and checkingcharge. A schrader valve is factory installed. A service port capis supplied to protect the schrader valve from contaminationand serve as the primary leak seal.NOTEĆAlways keep valve stem caps clean.To Access Schrader Port:INLET(TO INDOOR COIL)SCHRADERVALVELIQUID LINE SERVICE VALVE (VALVE CLOSED)RETAINING RINGSERVICEPORTOUTLET(TO COMPRESSOR)1 - Remove service port cap with an adjustable wrench.STEM CAPINSERT HEXWRENCH HERE2 - Connect gauge to the service port.3 - When testing is completed, replace service port cap.Tighten finger tight, then an additional 1/6 turn.SERVICEPORT CAPTo Open Liquid or Suction Line Service Valve:1 - Remove stem cap with an adjustable wrench.2 - Using service wrench and 5/16" hex head extensionback the stem out counterclockwise until the valve stemjust touches the retaining ring.3 - Replace stem cap and tighten finger tight, then tightenan additional 1/6 turn.Page 6INLET(TO INDOOR COIL)SCHRADER VALVE OPENTO LINE SET WHEN VALVE ISCLOSED (FRONT SEATED)(VALVE FRONTSEATED)FIGURE 9
B - Service ValvesA - Pumping Down SystemSuction Line (Ball Type) Service ValveA ballĆtype full service valve is used on all 12ACB units.Valves are not rebuildable. If a valve has failed it must be reĆplaced. A ball valve is illustrated in figure 10.The ball valve is equipped with a service port. A schradervalve is factory installed. A service port cap is supplied to proĆtect the schrader valve from contamination and assure aleak free seal.SUCTION LINE (BALL TYPE) SERVICE VALVE(VALVE OPEN)3- Start outdoor unit.4- Monitor suction gauge. Stop unit when 0 psig is reached.5- Front seat (close) suction line valve.B - Leak Testing (To Be DoneBefore Evacuating)BALL(SHOWN OPEN)1- Attach gauge manifold and connect a drum of dry nitroĆgen to center port of gauge manifold.2- Open high pressure valve on gauge manifold andpressurize line set and indoor coil to 150 psig (1034kPa).3- Check lines and connections for leaks.INLET(FROM INDOOR COIL)SERVICEPORTCAPSERVICE PORTSCHRADER COREIV - CHARGINGThe system may be pumped down when leak checking theline set and indoor coil or making repairs to the line set orindoor coil.2- Front seat (close) liquid line valve.STEM CAPSTEMDeep vacuum operation (operating compressor at 0psig or lower) can cause internal fusite arcingresulting in a damaged or failed compressor. Thistype of damage will result in denial of warranty claim.1- Attach gauge manifold.USE ADJUSTABLE WRENCHROTATE STEM CLOCKWISE 90 TO CLOSEROTATE STEM COUNTERĆCLOCKWISE 90 TO OPENOUTLET(TO COMPRESSOR)CAUTIONFIGURE 10The unit is factory-charged with the amount of R-22 refrigĆerant indicated on the unit rating plate. This charge isbased on a matching indoor coil and outdoor coil with a 20foot (6.1 m) line set. For varying lengths of line set, refer totable 3 for refrigerant charge adjustment. A blank space isprovided on the unit rating plate to list actual field charge.NOTE-The preferred method is to use an electronic leak orHalide detector. Add a small amount of R22 (3 to 5 psig[20kPa to 34kPa]) then pressurize with nitrogen to 150 psig.4- Release nitrogen pressure from the system, correct anyleaks and recheck.IMPORTANTIf line length is greater than 20 feet (6.1 m) add thisamount. If line length is less than 20 feet (6.1 m),subtract this amount.LIQUID LINESET DIAMETER1/4 in. (6 mm)5/16 in. (8mm)3/8 in. (10 mm)TABLE 3Ounce per 5 foot (ml per mm) adjustfrom 20 foot (6.1m) line set*1 ounce per 5 feet (30 ml per 1524 mm)2 ounce per 5 feet (60 ml per 1524 mm)3 ounce per 5 feet (90 ml per 1524 mm)*If line set is greater than 20 ft. (6.1m) add this amount. If line setis less than 20 feet (6.1 m) subtract this amountUnits are designed for line sets up to 50 feet (15.2 m).Consult Lennox Refrigerant Piping Manual for line setsover 50 feet (15.2 m).Page 7CAUTIONWhen using dry nitrogen, a pressure reducing regĆulator must be used to prevent excessive presĆsure in gauge manifold, connecting hoses, andwithin the system. Regulator setting must not exĆceed 150 psig (1034 kpa). Failure to use a regulatorcan cause equipment failure resulting in injury.
C - Evacuating the SystemExpansion Valve Systems1- Attach gauge manifold. Connect vacuum pump (with vacĆuum gauge) to center port of gauge manifold. With bothmanifold service valves open, start pump and evacuateindoor coil and refrigerant lines.The following procedures are intended as a general guide foruse with expansion valve systems only. For best results, inĆdoor temperature should be between 70 F and 80 F (21.1 Cand 26.7 C). Outdoor temperature should be 60 F (15.6 C) orabove. Slight variations in charging temperature and pressureshould be expected. Large variations may indicate need forfurther servicing.IMPORTANTA temperature vacuum gauge, mercury vacuum(U-tube), or thermocouple gauge should be used.The usual Bourdon tube gauges are not accurateenough in the vacuum range.IMPORTANTIMPORTANTThe compressor should never be used to evacuĆate a refrigeration or air conditioning system.2- Evacuate the system to 29 inches (737mm) vacuum.During the early stages of evacuation, it is desirable tostop the vacuum pump at least once to determine if thereis a rapid loss of vacuum. A rapid loss of vacuum wouldindicate a leak in the system and a repeat of the leaktesting section would be necessary.3- After system has been evacuated to 29 inches(737mm), close gauge manifold valves to center port,stop vacuum pump and disconnect from gauge manĆifold. Attach an upright nitrogen drum to center port ofgauge manifold and open drum valve slightly to purgeline at manifold. Break vacuum in system with nitroĆgen pressure by opening manifold high pressurevalve. Close manifold high pressure valve to centerport.4- Close nitrogen drum valve and disconnect fromgauge manifold center port. Release nitrogen presĆsure from system.5- Connect vacuum pump to gauge manifold centerport. Evacuate system through manifold servicevalves until vacuum in system does not rise above.5mm of mercury absolute pressure or 500 micronswithin a 20-minute period after stopping vacuum pump.6- After evacuation is complete, close manifold center port,and connect refrigerant drum. Pressurize systemslightly with refrigerant to break vacuum.D - ChargingIf the system is completely void of refrigerant, the recomĆmended and most accurate method of charging is to weighthe refrigerant into the unit according to the total amountshown on the unit nameplate. Also refer to the SPECIFIĆCATIONS tables on pages 1 and 2.If weighing facilities are not available or if unit is just low oncharge, the following procedure applies.Page 8The following procedure requires accurate readĆings of ambient (outdoor) temperature, liquidtemperature and liquid pressure for propercharging. Use a thermometer with accuracy of 2 F ( 1.1 C) and a pressure gauge with accuracyof 5 PSIG ( 34.5 kPa).APPROACH METHOD (TXV SYSTEMS)(Ambient Temperature of 60 F [16 C] or Above)NOTEĆ It may be necessary to restrict air flow in order toreach liquid pressures in the 200Ć250 psig range whichare required for checking charge. The indoor temperatureshould be above 70 F (21 C). Block equal sections of airintake panels, moving obstructions sideways until liquidpressures in the 200Ć250 psig range are reached.1 - Connect gauge manifold. Connect an upright R-22drum to center port of gauge manifold.2 - Record outdoor air (ambient) temperature.3 - Operate indoor and outdoor units in cooling mode.Allow outdoor unit to run until system pressures staĆbilize.4 - Make sure thermometer well is filled with mineral oilbefore checking liquid line temperature.5 - Place thermometer in well and read liquid line temĆperature. Liquid line temperature should be warmerthan the outdoor air temperature. Table 4 shows howmany degrees warmer the liquid line temperatureshould be.Add refrigerant to lower liquid line temperature.Recover refrigerant to raise the liquid line temperaĆture.Add refrigerant slowly as the unit approaches thecorrect temperature. This will allow the refrigerant tostabilize allowing the correct temperature to be read.6 - When unit is properly charged, liquid line presĆsures should approximate those in tables 5 and 6.
TABLE 4APPROACH METHOD12ACB-1Model12ACB-2APPROACH TEMPERATURELIQUID LINE F - OUTDOOR AMBIENT F9 F (5.0 C)12 F (6.7 C)14 F (7.8 C)13 F (7.2 C)8 F (4.4 C)11 F (6.1 CH TEMPERATUREModelLIQUID LINE F - OUTDOOR AMBIENT F12ACB2410 F (5.5 C)12ACB308 F (4.4 C)12ACB367 F (3.8 C)12ACB428 F (4.4 C)TABLE 512ACB-1 SERIES UNITSOUTDOOR COILENTERING AIRTEMPERATURE12ACB24LIQ.SUC. 10 10PSIGPSIGNORMAL OPERATING .SUC. 10 10 10 10 10 10PSIGPSIGPSIGPSIGPSIGPSIG12ACB48LIQ.SUC. 10 10PSIGPSIG12ACB60LIQ.SUC. 10 10PSIGPSIG65 F (18.3 C)14875148751587315873146711537175 F (23.92 C)173761747618374183741717317885 F (31.2 4576231752407526880269802827828077270782767795 F (31.2 C)105 F (31.2 C)*These are typical pressures only. Indoor evaporator match up, indoor air quality and evaporator load will cause the pressures to vary.TABLE 612ACB-2 SERIES UNITSNORMAL OPERATING PRESSURES*OUTDOOR COILENTERING AIRTEMPERATURE12ACB2412ACB3012ACB3612ACB42LIQ. 10PSIGSUC. 10PSIGLIQ. 10PSIGSUC. 10PSIGLIQ. 10PSIGSUC. 10PSIGLIQ. 10PSIGSUC. 10PSIG82 F (47.2 C)1877718072190731877995 F (52.8 C)22679219742297522980*These are typical pressures only. Indoor evaporator match up, indoor air quality and evaporator load will cause the pressures to vary.E - Oil ChargeB - Indoor CoilRefer to table 2 on page 4.V - MAINTENANCEAt the beginning of each cooling season, the system shouldbe cleaned as follows:A - Outdoor Unit1 - Clean and inspect condenser coil. (Coil may beflushed with a water hose).2 - Visually inspect all connecting lines, joints and coilsfor evidence of oil leaks.NOTEĆOutdoor fan motors are permanentlylubricated.Page 91 - Clean coil if necessary.2 - Check connecting lines and coil for evidence of oilleaks.3 - Check condensate line and clean if necessary.C - Indoor Unit1 - Clean or change filters.2 - Bearings are preĆlubricated and need no further oilĆing.3 - Check all wiring for loose connections.4 - Check for correct voltage at unit.5 - Check amp-draw on blower motor.Unit nameplate Actual .
VI - WIRING DIAGRAMS AND SEQUENCE OF OPERATION12ACB 2 THROUGH 5 TON OPERATING SEQUENCE16223745282Timed off controlused on Dash 1 modĆels only12ACB 2 - 5 TON OPERATING SEQUENCEThis is the sequence of operation for 12ACB 2 through 5 ton units. The sequence is outlined by numbered steps whichcorrespond to circled numbers on the adjacent diagram.NOTE- The thermostat used may be electromechanical or electronic.NOTE- Transformer in indoor unit supplies power (24 VAC) to the thermostat and outdoor unit controls.COOLING:1 - Cooling demand initiates at Y1 in the thermostat.2 - 24VAC from indoor unit (Y1) energizes the timed off control (TOC), which energizes compressor contactor K1 proĆvided the 5 minute delay is satisfied.NOTE- Later model units do not have the TOC. Call for cooling goes directly to contactor K1.3 - K1Ć1 N.O. closes, energizing compressor (B1) and outdoor fan motor (B4).4 - Compressor (B1) and outdoor fan motor (B4) begin immediate operation.END OF COOLING DEMAND:5 - Cooling demand is satisfied. Terminal Y1 is deĆenergized.6 - Compressor contactor K1 is deĆenergized.7 - K1Ć1 opens and compressor (B1) and outdoor fan motor (B4) are deĆenergized and stop immediately.Page 10
12ACB 2 THROUGH 3 1/2 TON OPERATING SEQUENCE12ACB 2 5 TON OPERATING SEQUENCEThis is the sequence of operation for 12ACB 2 through 5 ton units. The sequence is outlined by numbered steps whichcorrespond to circled numbers on the adjacent diagram.NOTE The thermostat used may be electromechanical or electronic.NOTE Transformer in indoor unit supplies power (24 VAC) to the thermostat and outdoor unit controls.COOLING:1 C ooling demand initiates at Y1 in the thermostat.2 2 4VAC from indoor unit (Y1) energizes the timed off control (TOC), which energizes compressor contactor K1 pro"vided the 5 minute delay is satisfied.NOTE Later model units do not have the TOC. Call for cooling goes directly to contactor K1.3 K 1"1 N.O. closes, energizing compressor (B1) and outdoor fan motor (B4).4 Compressor (B1) and outdoor fan motor (B4) begin immediate operation.END OF COOLING DEMAND:5 Cooling demand is satisfied. Terminal Y1 is de"energized.6 Compressor contactor K1 is de"energized.7 K1"1 opens and compressor (B1) and outdoor fan motor (B4) are de"energized and stop immediately.Page 11
12ACB 4 and 5 TON OPERATING SEQUENCE12ACB 2 5 TON OPERATING SEQUENCEThis is the sequence of operation for 12ACB 2 through 5 ton units. The sequence is outlined by numbered steps whichcorrespond to circled numbers on the adjacent diagram.NOTE The thermostat used may be electromechanical or electronic.NOTE Transformer in indoor unit supplies power (24 VAC) to the thermostat and outdoor unit controls.COOLING:1 C ooling demand initiates at Y1 in the thermostat.2 2 4VAC from indoor unit (Y1) energizes the timed off control (TOC), which energizes compressor contactor K1 pro"vided the 5 minute delay is satisfied.NOTE Later model units do not have the TOC. Call for cooling goes directly to contactor K1.3 K 1"1 N.O. closes, energizing compressor (B1) and outdoor fan motor (B4).4 Compressor (B1) and outdoor fan motor (B4) begin immediate operation.END OF COOLING DEMAND:5 Cooling demand is satisfied. Terminal Y1 is de"energized.6 Compressor contactor K1 is de"energized.7 K1"1 opens and compressor (B1) and outdoor fan motor (B4) are de"energized and stop immediately.Page 12
208/230 208/230 208/230 208/230 208/230 12ACB COMPRESSOR SPECIFICATIONS 208/230 142104 18.0 129 23.7 12ACB36 42 38 38 57 50 MAN/MODEL COP/ZR22K3 PFV COP/ZR28K3 PFV COP/ZR34K3 PFV COP/ZR40K3 PFV COP/ZR46K3 PFV COP/ZR57K3 PFV The scroll compressor is quieter than a reciprocating
Complexities of micro service module module ule module module ule module svc svc c svc svc c. #IstioCon Microservice SDK Node 1 Consumer svc app SDK Service management Node 2 Producer svc app SDK . Spring Cloud - Cloud Foundry Service Broker Spring Cloud Cluster Spring Cloud Commons Spring Cloud Config Spring Cloud Connectors .
208/230 208/230 208/230 208/230 208/230 12ACB COMPRESSOR SPECIFICATIONS 208/230 142104 18.0 129 23.7 12ACB36 42 38 38 57 50 MAN/MODEL COP/ZR22K3 PFV COP/ZR28K3 PFV COP/ZR34K3 PFV COP/ZR40K3 PFV COP/ZR46K3 PFV COP/ZR57K3 PFV The scroll compressor is quieter than a reciprocatin
accompanied by a meticulous monitoring of the available storage capacity of the array and the storage pool used for SVC. Thin provisioning requires a small number of large, and equal in size, LUNs for each SVC mdiskgroup. Refer to the IBM SVC Infocenter and Redbooks for best practic es.
Increasingly, CMMI-DEV and CMMI-SVC are used in the same organization, implementing and appraising together. Choose CMMI-SVC as your base model, grab the engineering PAs for particular services. Treat development or engineering as a service, managed using the practices of CMMI-SVC, and
SVC syndrome Spinal cord compression. SUPERIOR VENA CAVA SYNDROME. Definition Obstruction of blood flow through the SVC Etiology Can be caused by direct invasion of tumor into the SVC, or by external compression of the SVC by an adjacent pathologic process involving the right lung, lymph nodes, and
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FOR INDUSTRIAL HEATING OF AIR AND GAS UP TO 800 C (1470 F) Traditional heating cassettes are commonly equipped with tubular heating elements as the heating source. The design of these elements limits the maximum reachable air/gas temperature to about 600 C (1110 F). With the state of art heating element design used in our Kanthal heating .
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