13ACX - Lennox Parts Ready to Ship @ AcFurnaceParts.com
Contents
1. LENNOX UIT INFORMATION 13ACX e i Service Literature BARN ATA 13ACX SERIES UNITS The 13ACX is a high efficiency residential split system con densing unit which features a scroll compressor and de signed for R 410A refrigerant 13ACX units are available in sizes ranging from 1 1 2 through 5 tons The series is de signed for use with an expansion valve in the indoor unit This manual is divided into sections which discuss the major components refrigerant system charging procedure main tenance and operation sequence Information contained in this manual is intended for use by qualified service technicians only All specifications are sub ject to change A IMPORTANT Operating pressures of this R 410A unit are higher than pressures in R 22 units Always use service equipment rated for R 410A AWARNING Improper installation adjustment alteration service or maintenance can cause property damage person al injury or loss of life Installation and service must TABLE OF CONTENTS be performed by a qualified installer or service General M Page 1 agency Specifications Electrical Data Page 2 A WARNING Application ue rites Ere Sense nae Page 3 Warranty will be voided if covered equipment is re IBI EO ORBIS senses ecco agg Page 3 moved from original installation site Warranty will Ill Refrigeration System Page 6 not cover damage or defect resulting from Flood wind lightning2. pumping down the system This type of dam age can be detected and will result in denial of warranty claims The scroll compressor is quieter than a reciprocating com pressor however the two compressors have much different sound characteristics The sounds made by a scroll compres sor do not affect system reliability performance or indicate damage NOTE During operation the head of a scroll compressor may be hot since it is in constant contact with discharge gas SCROLL FORM FIGURE 4 CROSS SECTION OF SCROLLS DISCHARGE STATIONARY SCROLL DISCHARGE SUCTION S WN SS N WW Ny N NWN y TIPS SEALED BY ORBITING SCROLL DISCHARGE PRESSURE FIGURE 5 LD ZZ A ae 7 Li SQ ID 7 Uj VZEFZZZ SUF SZ NI OH A SSASSAASASASS Vg SSS N SOAS LH LLI PA INSNANANNYWTY AARARAAAY ILILILILIL SOSASAAASSSS LZ WEZEZZZPg g 7 Page 4 SUCTION Y ORBITING SCROLL p STATIONARY SCROLL SUCTION POCKET SUCTION SUCTION ay INTERMEDIATE PRESSURE 2 ar GAS CRESCENT SHAPED GAS POCKET FLANKS SEALED 7 BY CENTRIFUGAL 3 FORCE J MOVEMENT OF ORBIT HIGH PRESSURE GAS SUCTION M DISCHARGE POCKET FIGURE 6 C Condenser Fan Motor All units use single phase PSC fan motors which require a run capacitor In all units the condenser fan is controlled by the compressor contactor ELECTRICAL DATA tables in this manual show specifi cations
3. 274 1 105 340 5 121 423 2 136 512 9 75 2174 et 2782 106 3453 122 428 8 137 519 3 209 92 2823 107 360 1 123 434 5 138 525 8 77 2244 93 286 5 108 365 0 124 440 2 139 5324 jre zeo 10900 t40 5990 Ec Co A A A Az A Co O 42 122 6 o a fo o a O ao A met 1 152 54 155 A a fo C1 Co N M M o A e Page 11 Approach TXV Charge START Measure outdoor ambient temperature USE WEIGH IN METHOD Weigh in or remove refriger ant based upon line length bient 65 F 189C APPROACH TXV If value is greater than shown high approach add refrigerant if less than shown liquid temp too close to ambient temp low approach remove refrigerant If refrigerant added or removed retest to confirm that unit is properly charged APP Approach Values F 1 0 C 0 6 F C X 018 024 030 036 042 048 060 Any 8 4 4 8 4 5 29 5 0 15 8 3 10 5 6 6 3 3 9 5 0 Temperature of air entering outdoor coil Subcooling TXV Charge Confirm proper airflow across coil using figure 11 Check liquid and vapor line pressures and compare unit pressures with Normal Operat ing Pressures listed in table 2 on page 9 Table 2 is a general guide Expect minor pressures variations Significant differences may mean improper char
4. 72 these C temperatures would necessitate stated ac tions o LL C Tprop DT F ACTION 539 19 15 4 increase the airflow 589 14 15 14 within 3 range no change 62 10 15 5 Decrease the airflow Step 4 Adjust the fan speed See indoor unit instructions to in crease decrease fan speed Changing air flow affects all temperatures recheck temperatures to confirm that the temperature drop and DT are within 3 FIGURE 11 Page 8 Pre Charge Maintenance Checks TABLE 2 Normal Operating Pressures TXV Use this table to perform maintenance checks it is not a procedure for charging A IM PORTANT the system Minor variations in these pressures may be due to differences in installations Significant deviations could mean that the system is not properly charged or that a problem exists with some component in the system 13ACX 018 024 030 036 042 048 060 1 060 2 F C Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Expansion Valve TXV 65 18 244 135 249 137 241 134 253 134 250 135 240 130 247 129 242 130 70 21 262 136 268 138 259 135 274 135 268 137 257 131 265 130 266 131 75 24 281 137 288 138 279 136 293 136 288 138 278 132 286 131 286 132 80 27 302 138 309 140 300 137 315 137 310 139 299 133 310 132 309 133 85 29 323 139 331 140 322 1
5. 866 22 866 22 866 22 866 Outdoor Diameter in mm 18 457 18 457 18 457 18 457 18 457 22 559 22 559 kan Number of blades 3 3 4 4 4 4 4 Motor hp W 1 5 149 1 5 149 1 5 149 1 5 149 1 3 249 1 4 186 1 4 186 Cfm L s 2500 1180 2500 1180 2450 1155 2450 1155 2930 1385 3830 1805 3830 1805 Rpm 1100 1100 1100 1100 1100 825 825 Watts 200 200 200 200 310 330 330 Shipping Data lbs kg 1 package 122 55 129 59 150 68 150 68 177 80 201 91 222 100 ELECTRICAL DATA Line voltage data 60 hz 1ph 208 230V 208 230V 208 230V 208 230V 208 230V 208 230V 208 230V Maximum overcurrent protection amps 20 30 30 35 40 50 60 3 Minimum circuit ampacity 12 3 17 9 18 7 21 9 24 1 28 9 34 5 Compressor Rated load amps 26 2 Power factor 98 Locked rotor amps 134 Condenser Full load amps 1 7 Fan Motor Locked rotor amps 3 1 OPTIONAL ACcESSORIES must be ordered extra Compressor Crankcase 93M05 e e Heater 31J20 Factory Compressor Hard Start Kit 10J42 88M91 e Compressor Low Ambient Cut Off 45F08 Compressor Sound Cover 69J03 Compressor Time Off Control 4727 e Freezestat 3 8 in tubing 93G35 e e 1 2 in tubing 39H29 5 8 in tubing 50A93 Hail Guards 92M88 92M89 45M56 92M94 Loss of Charge Kit 84M23 Low Ambi
6. Connect manifold gauge to service valve port 2 With both manifold valves closed open the valve on the R 410A cylinder 3 Open the high pressure side of the manifold to allow the R 410A into the line set and indoor unit Weigh in a trace amount of R 410A A trace amount is a maximum of 2 ounces 57 g or 3 pounds 31 kPa pressure Close the valve on the R 410A cylinder and the valve on the high pressure side of the manifold gauge set Disconnect the R 410A cylinder 4 Connect a cylinder of nitrogen with a pressure regulat ing valve to the center port of the manifold gauge set 5 Connect the manifold gauge set high pressure hose to the vapor valve service port Normally the high pres sure hose is connected to the liquid line port however connecting it to the vapor port better protects the man ifold gauge set from high pressure damage 6 Adjust the nitrogen pressure to 150 psig 1034 kPa Open the valve on the high side of the manifold gauge set which will pressurize line set and indoor unit 7 After a few minutes open a refrigerant port to ensure the refrigerant you added is adequate to be detected Amounts of refrigerant will vary with line lengths Check all joints for leaks Purge nitrogen and R 410A mixture Correct any leaks and recheck B Evacuating Evacuating the system of noncondensables is critical for proper operation of the unit Noncondensables are defined as any gas that will not condense under
7. connections ELECTROSTATIC DISCHARGE ESD Precautions and Procedures A CAUTION Electrostatic discharge can affect electronic com ponents Take precautions during unit installation and service to protect the unit s electronic controls Precautions will help to avoid control exposure to electrostatic discharge by putting the unit the con trol and the technician at the same electrostatic po tential Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface be fore performing any service procedure Page 3 CONTROL BOX A eee D UAL CAPACITOR C12 COMPRESSOR CONTACTOR K1 ao ala oa a Jol o TIMED OFF GROUNDING oO e CONTROL LUG OPTION 6 FIGURE 2 1 Compressor Contactor K1 A DANGER Shock Hazard Remove all power at disconnect before removing access panel Single phase 13ACX units use single pole contactors Potential exists for electrical shock resulting in injury or death Line voltage exists at all compo nents even when unit is not in op eration The compressor is energized by a single pole contactor lo cated in the control box See figure 2 K1 is energized by the indoor thermostat terminal Y1 24V when thermostat de mand is present 2 Dual Capacitor C12 The compressor and fan in 13ACX series units use per manent split capacitor mot
8. or installation and operation in IV Charging erao ianea iao aa Page 7 a corrosive atmosphere chlorine fluorine salt re cycled waste water urine fertilizers or other damag VI Maintenance 2o seri sa br dua Page 13 ing chemicals VII Wiring and Sequence of Operation Page 14 Technical Te Page 1 2006 Lennox Industries Inc SPECIFICATIONS General Model No Data Nominal Tonnage kW Liquid line o d in mm Suction line o d in mm 1 Refrigerant R 410A furnished Connections sweat 13ACX 018 1 5 5 3 3 8 9 5 3 4 19 1 4 Ibs 7 oz 2 01 kg 13ACX 024 2 7 0 3 8 9 5 3 4 19 1 4 Ibs 14 oz 2 21 kg 13ACX 030 13ACX 036 2 5 8 8 3 8 9 5 3 4 19 1 6 lbs 3 oz 2 81 kg 3 10 6 3 8 9 5 7 8 22 2 6 lbs 7 oz 2 92 kg 13ACX 042 3 5 12 3 3 8 9 5 7 8 22 2 8 Ibs 14 oz 4 03 kg 13ACX 048 13ACX 060 4 14 1 3 8 9 5 7 8 22 2 8 Ibs 4 oz 3 74 kg 2 units 5 17 6 3 8 9 5 1 1 8 28 6 10 Ibs 0 oz 4 54 kg Outdoor Net face area Outer coil 13 22 1 23 15 11 1 40 13 22 1 23 13 22 1 23 15 11 1 40 16 33 1 52 21 0 1 95 Coil 8q ft m Inner coil 12 60 1 17 12 60 1 17 14 40 1 34 15 71 1 46 20 25 1 88 Tube diameter in mm 5 16 8 5 16 8 5 16 8 5 16 8 5 16 8 5 16 8 Number of rows 1 2 2 2 2 2 Fins per inch m 22 866 2 22 866 22
9. vacuum is equal to atmospheric pressure minus vacu um pressure 6 When the absolute pressure reaches 23 000 microns 29 01 inches of mercury close the manifold gauge valves turn off the vacuum pump and disconnect the manifold gauge center port hose from vacuum pump Attach the manifold center port hose to a nitrogen cylin der with pressure regulator set to 150 psig 1034 kPa and purge the air from the hose with nitrogen Open the manifold gauge valves to break the vacuum in the line set and indoor unit Close the manifold gauge valves A CAUTION Danger of Equipment Damage Avoid deep vacuum operation Do not use compres sors to evacuate a system Extremely low vacuums can cause internal arcing and compressor failure Damage caused by deep vacuum operation will void warranty Check Indoor Airflow before Charging 7 Shut off the nitrogen cylinder and remove the manifold gauge hose from the cylinder Open the manifold gauge valves to release the nitrogen from the line set and in door unit oo 1 Reconnect the manifold gauge to the vacuum pump turn the pump on and continue to evacuate the line set and indoor unit until the absolute pressure does not rise above 500 microns 29 9 inches of mercury within a 20 minute period after shutting off the vacuum pump and closing the manifold gauge valves 9 When the absolute pressure requirement above has been met disconnect the manifold hose from the vacu um pump and
10. 12 Confirm proper airflow across coil using figure 11 Check liquid and vapor line pressures and compare unit pressures with Normal Operat ing Pressures listed in table 2 Table 2 is a general guide Expect minor pres sures variations Significant differences may mean improper charge or other system prob lem Use SUBCOOLING to correctly charge unit or to verify the charge is correct SUBCOOLING METHOD Set thermostat to call for heat must have a cooling load between 70 80 F 21 26 C Connect gauge set Measure outdoor ambient temperature When heat demand is satisfied set thermo stat to call for cooling Allow temperatures and pressures to stabilize NOTE IF NECESSARY block outdoor coil to maintain 325 375 psig Record line temp LIQ Measure liquid line pressure and use the val ue to determine saturation temperature table 4 on page 11 SAT Subtract to determine subcooling SC SAT LIQ SC Compare results with table to the left V MAINTENANCE A WARNING Electric shock hazard Can cause injury or death Before attempting to perform any service or maintenance turn the W electrical power to unit OFF at discon v nect switch es Unit may have multiple power supplies Maintenance and service must be performed by a qualified installer or service agency At the beginning of each cooling season the system should be checked as follows 1
11. 35 temperature VAP Subtract to determine superheat SH VAP SAT SH Record the wet bulb temperature air entering indoor coil WB Record outdoor ambient temperature Compare results with table to the left NOTE Do not at 85 26130 33 tempt to charge sys tem where a dash ap 90 24127 31 pears system could 95 22 25 29 be overcharged Su 100 21 24 28 perheat is taken at va 105 17122 26 por line service port Vapor line superheat 110 15 20 25 must never be less 115 14 18 24 than 5 F at the vapor Dry bulb temperature F of entering outdoor ambient air line service port Table 4 HFC 410A Temperature F Pressure Psig F Psig 35 107 1 38 113 6 39 115 8 1816 80 235 3 95 205 1 ttt 370 0 126 451 8 142 552 3 st fiaa oe Tiers Par ar ar aras EIER ERE TR 51 1448 1877 82 2427 97 303 8 113 3802 128 463 5 565 9 1909 83 2465 o8 308 2 114 385 4 129 469 5 194 1 84 2503 99 3127 115 39077 130 475 6 54 152 8 1973 85 2541 100 3172 116 3960 131 481 6 147 zo 2006 86 2580 101 321 8 117 401 3 132 487 8 71 2039 87 2620 102 3264 118 406 7 133 494 0 207 2 266 0 103 331 0 119 412 2 134 5002 58 163 9 2106 89 270 0 104 3357 120 4177 135 506 5 59 166 7 14 0 90
12. Make sure power is off before cleaning Clean and inspect outdoor coil The coil may be flushed with a water hose The outdoor coil is protected by an inner mesh screen and a wire cage see figure 13 If debris has collected between the mesh screen and the coil and cannot be dislodged by spraying unpressurized water from inside coil surface to the outside the mesh may be removed by first removing the top of the unit which will allow for re moval of the wire cage Then using pliers to grip the head of the push pins pull straight out to extract the push pins along one side of the coil If necessary remove the push pins along the back of the unit it is usually unnecessary to fully remove the inner mesh screen Drape the mesh screen back and wash the coil When all the debris has been removed from the coil reinstall the mesh screen by positioning it in its original position and reinserting the push pin No tool is required to push the pin back into the same slot in the fins If the push pin is loose and tends not to stay in place brush the fins with a fin brush 22 fins in Line up the push pin a couple fins to the right or left of the original hole and re insert the pin 2 Outdoor fan motor is prelubricated and sealed No further lubrication is needed 3 Visually inspect connecting lines and coils for evidence of oil leaks 4 Check wiring for loose connections 5 Check for correct voltage at unit unit operating 6 Check amp
13. Stem Counter clockwise 90 om stem cap woe to outdoor coil cap eG x X service port Schrader valve FIGURE 10 Page 6 IV CHARGING A WARNING R 410A refrigerant can be harmful if it is inhaled R 410A refrigerant must be used and recovered re sponsibly Failure to follow this warning may result in personal injury or death A Leak Testing After the line set has been connected to the indoor and out door units check the line set connections and indoor unit for leaks A IMPORTANT The Clean Air Act of 1990 bans the intentional venting of CFC s and HFC s as of July 1 1992 Approved methods of recovery recycling or reclaiming must be followed Fines and or incarceration my be levied for noncompliance A WARNING Fire Explosion and Personal Safety Hazard Failure to follow this warning could result in damage personal injury or death Never use oxygen to pressurize or purge refrigeration lines Oxygen when exposed to a spark or open flame can cause damage by fire and or an explosion that can re sult in personal injury or death A WARNING Danger of explosion When using a high pressure gas such as dry nitrogen to pressurize a refriger ant or air conditioning system use a regulator that can control the pressure down to 1 or 2 psig 6 9 to 13 8 kPa Page 7 Using an Electronic Leak Detector 1 Connect a cylinder of R 410A to the center port of the manifold gauge set
14. draw outdoor fan motor Unit nameplate Actual NOTE If owner reports insufficient cooling the unit Son be gauged and refrigerant charge checked See refrigerant charging section 9 pins used on 048 and 060 6 pins all others i AXON MNA AA Ri ey vox NON ANA MNT MESH SCREEN e AX ANAVO Figure 13 Indoor Coil 1 Clean coil if necessary 2 Check connecting lines and coils for signs of oil leaks 3 Check the condensate pan line and clean if necessary Indoor Unit 1 Clean or change filters 2 Adjust blower speed for cooling The pressure drop over the coil should be measured to determine the correct blower CFM Refer to the unit information service manual for pressure drop tables and procedure 3 Check all wiring for loose connections 4 Check for correct voltage at unit blower operating 5 Check amp draw on blower motor Unit nameplate Actual Page 13 VI WIRING DIAGRAMS AND SEQUENCE OF OPERATION OUTDOOR FAN TO 24 VAC POWER SOURCE 20 VA MINIMUN NEC CLASS 2 YI COMPRESSOR CRANKCASE HEATER HIGH PRESSURE S87 OR S24 GROUND XXE eR TE iren D Sonce KEY __COMPONENT TO UNIT RATING PLATE 20 VA MINIMUN M Ie CONTROL TIMED OFF FOR MINIMUM CIRCUIT NEC CLASS 2 BI COMPRESSOR AMPACITY AND MAXIMUM OVERCURRENT PROTECTION ZA JUMPER IS USED WHEN TOC IS NOT USED 924 SWITCH LOSS OF CHARGE 540 THERMOSTAT CRANKCASE WARNING Frat HOK K HAZAR
15. temperatures and pressures present during operation of an air conditioning system Noncondensables and water vapor combine with refrigerant to produce substances that corrode copper pip ing and compressor parts NOTE This evacuation process is adequate for a new installation with clean and dry lines If excessive mois ture is present the evacuation process may be required more than once A IMPORTANT Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns Use an instrument that reads from 50 microns to at least 20 000 microns 1 Connect manifold gauge set to the service valve ports e low pressure gauge to vapor line service valve e high pressure gauge to liquid line service valve 2 Connect micron gauge 3 Connect the vacuum pump with vacuum gauge to the center port of the manifold gauge set 4 Open both manifold valves and start the vacuum pump 5 Evacuate the line set and indoor unit to an absolute pressure of 23 000 microns 29 01 inches of mercury During the early stages of evacuation it is desirable to close the manifold gauge valve at least once to deter mine if there is a rapid rise in absolute pressure A rap id rise in pressure indicates a relatively large leak If this occurs repeat the leak testing procedure NOTE The term absolute pressure means the total actual pressure within a given volume or system above the absolute zero of pressure Absolute pressure in a
16. 146 115 46 476 148 479 149 482 149 483 151 490 145 472 147 489 146 490 148 Values shown are typical pressures indoor unit match up indoor air quality equipment and indoor load will cause the pressures to vary Temperature of the air entering the outside coil Page 9 Determining Charge Method START Determine how refrigerant is metered WHEN TO CHARGE Warm weather best Which e Can charge in colder weather metering CHARGE METHOD Determine by device Metering device type Outdoor ambient temperature REQUIREMENTS Sufficient heat load in structure 40 F 39 F Indoor temperature between 70 80 F 18 3 C and 17 7 C and 4 4 C and 3 8 C and 21 26 C Above Below Above Below Manifold gauge set connected to unit Thermometers to measure outdoor ambient temperature 1o measure liquid line temperature APPROACH OR WEIGH IN SUPERHEAT WEIGH IN to measure vapor line temperature SUBCOOLING FIGURE 12 TABLE 3 censu cuneo Refrigerant Charge per Line Set Lengths 1 Recover the refrigerant from the unit Liquid Line Set Ounces per 5 feet g per 1 5 m adjust 2 Conduct leak check evacuate as previously outlined Diameter from 15 feet 4 6 m line set 3 Weigh in the unit nameplate charge plus any charge re quired for linesets differences from 15 feet If weighing NOTE If line length is greater than 15 ft 4 6 m add this amount If
17. 38 338 139 332 140 323 134 330 132 332 134 90 32 346 141 355 142 345 140 361 139 356 140 344 135 353 133 357 135 95 35 369 142 379 143 369 141 385 141 381 141 369 136 375 134 381 136 100 38 394 143 402 144 393 142 410 142 406 143 394 137 400 136 407 137 105 41 417 145 430 145 418 143 436 143 432 143 418 139 426 137 433 138 110 43 445 146 457 146 445 144 463 145 459 145 446 140 451 139 459 140 115 45 476 148 485 147 474 145 491 146 490 145 477 1141 482 141 488 141 Fixed Orifice RFC 65 18 244 135 244 125 243 116 252 129 250 135 248 127 248 123 255 126 70 21 262 136 263 128 262 120 271 131 268 137 266 130 269 127 274 128 75 24 281 137 282 131 283 124 290 133 288 138 284 132 295 131 294 131 80 27 302 138 303 134 305 128 312 136 310 139 305 134 315 133 317 134 85 29 323 139 326 137 328 132 334 139 332 140 325 137 334 135 339 136 90 32 346 141 347 138 351 135 356 141 356 140 347 139 359 138 362 138 95 35 369 142 372 141 376 139 380 143 381 141 371 141 384 140 386 140 100 38 394 143 396 143 401 142 405 145 406 143 394 143 409 142 413 142 105 41 417 145 421 145 427 145 429 147 432 143 418 144 434 144 435 144 110 43 445 146 449 147 454 147 456 148 459 145 445 146 462 145 462
18. D C CAN CAUSE ae GROUNDED IN ACCORDANCE WITH INDICA TESORI TONAL NATIONAL AND LOCAL CODES LINE VOLTAGE FIELD INSTALLED CLASS VOLTAGE FIELD INSTALLED upersedes Form No New Form No 534 773W 205 Litho U S A 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 24VAC from indoor unit Y1 energizes the TOC timed off control if used which energizes contactor K1 K1 1 N O closes energizing compressor B1 and outdoor fan motor B4 Compressor B1 and outdoor fan motor B4 begin immediate operation END OF COOLING DEMAND 5 Cooling demand is satisfied Terminal Y1 is de energized and the TOC if used begins its off cycle timing 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 14
19. an additional 1 6 turn To Close Service Valve 1 Remove the stem cap with an adjustable wrench 2 Using the adjustable wrench to keep the valve station ary use a service wrench with a hex head extension to turn the stem clockwise to seat the valve Tighten the stem firmly NOTE Use a 3 16 hex head extension for 3 8 line sizes or a 5 16 extension for large line sizes 3 Replace the stem cap Tighten finger tight then tighten an additional 1 6 turn NOTE Stem cap must be replaced to help prevent valve leakage Service Valve stem cap service port insert hex QC wrench here to outdoor coil service Schrader valve open to line set when valve is closed front seated valve front seated Service Valve Valve Open insert hex wrench here JdMe 5 ih A K service RN port Md stem cap W to outdoor coil 27 f TZ WA q EN service port cap to indoor coil Schrader valve FIGURE 9 Vapor Line Ball Valve 5 Ton Units Only Vapor line service valves function the same way as the other valves the difference is in the construction A ball valve is illustrated in figure 10 The ball valve is equipped with a service port with a factory installed Schrader valve A service port cap protects the Schrader valve from contamination and assures a leak free seal Ball Valve Valve Open Use Adjustable Wrench To open rotate Stem Clockwise 90 To close rotate
20. connect it to an upright cylinder of R 410A refrigerant Open the manifold gauge valves to break the vacuum from 1 to 2 psig positive pressure in the line set and indoor unit Close manifold gauge valves and shut off the R 410A cylinder and remove the manifold gauge set C Charging This system is charged with R 410A refrigerant which oper ates at much higher pressures than HCFC 22 The recom mended check expansion valve is approved for use with R 410A Do not replace it with a valve that is designed to be used with HCFC 22 This unit is NOT approved for use with coils that include metering orifices or capillary tubes NOTE Be sure that filters and indoor and outdoor coils are clean before testing Check indoor airflow using the step procedures as illustrated in figure 11 Temp of air entering indoor coil F INDOOR All temperatures are COIL expressed in F Step 1 Determine the desired DT Measure entering air tempera ture using dry bulb A and wet bulb B DT is the intersecting value of A and B in the table see triangle Step 2 Find temperature drop across coil Measure the coil s dry bulb entering and leaving air temperatures A and C Temperature Drop Formula Tprop A minus C Step 3 Determine if fan needs adjustment lf the difference be tween the measured Tprop and the desired DT Tprop DT is within 3 no adjustment is needed See examples Assume DT 15 and A temp
21. ent Kit 34M72 Mounting Base 69J06 E 69J07 Refrigerant L15 41 20 L15 41 30 Line Sets L15 41 40 L15 41 50 L15 65 30 L15 65 40 e L15 65 50 Field Fabricate Time Delay Relay Kit 58M81 s Unit Stand Off Kit 94J45 e Charge for 1 units 11 lbs 2 oz NOTE Extremes of operating range are plus 10 and minus 5 of line voltage 1 Refrigerant charge sufficient for 15 ft 4 6 m length of refrigerant lines 2 HACR type circuit breaker or fuse 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 2 APPLICATION 13ACX condensing units are available in 1 1 2 2 2 1 2 3 3 1 2 4 and 5 ton capacities All major components indoor blower and coil must be matched according to Lennox rec ommendations for the compressor to be covered under war ranty Refer to the Engineering Handbook for approved sys tem matchups ll UNIT COMPONENTS Unit components are illustrated in figure 1 13ACX PARTS ARRANGEMENT OUTDOOR FAN CAPACITOR YY UI OFF CONTROL OPTION JL N FIGURE 1 A Control Box Figure 2 13ACX units are not equipped with a 24V transformer All 24 VAC controls are powered by the indoor unit Refer to wiring diagram Electrical openings are provided under the control box cov er Field thermostat wiring is made to color coded pigtail
22. facilities are not available use the subcooling method line length is less than 15 ft 4 6 m subtract this amount Page 10 Superheat RFC Charge START Measure outdoor ambient temperature i ee proper airtow across collusing figure Check liquid and vapor line pressures and compare unit pressures with Normal Operating USE WEIGH IN METHOD Outdoor Pressures listed in table 2 Weigh in or remove refriger Ambient 40 F Note Table 2 is a general guide Expect minor ant based upon line length 4 C pressures variations Significant differences may mean improper charge or other system problem S gt R H FA R F Use SUPERHEAT to correctly charge unit or to verify the charge is correct If refrigerant added or removed retest to confirm that unit is properly charged SH Superheat Values 5 F SUPERHEAT METHOD i oF 72 74 76 If value is greater than Set thermostat to call for heat must have a shown add refrigerant 40 46148 51 cooling load between 70 80 F 21 26 C if less than shown 45 44146 49 Connect gauge set remove refrigerant 50 4244 47 When heat demand is satisfied set thermostat 55 40 42 44 to call for cooling 60 38 40 43 Allow temperatures and pressures to stabilize 65 36 38 41 Measure the vapor line pressure and use the 70 33 36 39 use value to determine saturation temperature 75 31134 37 table 4 on page 11 SAT Record vapor line 30 28 21
23. for condenser fans used in 13ACX s Access to the condenser fan motor on all units is gained by removing the four screws securing the fan assembly See figure 7 The grill fan assembly can be removed from the cabinet as one piece See figure 8 The condenser fan motor is removed from the fan guard by removing the four nuts found on top of the grill See figure 8 if condenser fan motor replacement is necessary A DANGER Make sure all power is disconnected before beginning electrical service procedures Remove screws SS C screws FIGURE 7 Page 5 ALIGN FAN HUB FLUSH WITH END OF SHAFT FIGURE 8 D Loss of Charge Switch option An auto reset single pole single throw low loss of charge switch is located in the suction line This switch shuts off the compressor when suction pressure drops below the factory setting The switch is closed during normal operating pres sure conditions and is permanently adjusted to trip open at 25 5 psi The switch automatically resets when suction line pressure rises above 55 5 psi E High Pressure Switch 13ACX units are equipped with a high pressure switch that is located in the liquid line The switch SPST manual reset normally closed removes power from the compressor con tactor control circuit when discharge pressure rises above factory setting at 590 10 psi lll REFRIGERANT SYSTEM A Plumbing Field refrigerant piping consists of liquid and suction lines from
24. ge or other system problem Use APPROACH to correctly charge unit or to verify the charge is correct APPROACH METHOD Set thermostat to call for heat must have a cooling load between 70 80 F 21 26 C Connect gauge set When heat demand is satisfied set thermo stat to call for cooling Allow temperatures and pressures to stabilize Record outdoor ambient temperature AMB Record line temp LIQ Subtract to determine approach APP LIQ AMB _ APP Compare results with table to the left START Measure outdoor ambient temperature USE WEIGH IN METHOD Weigh in or remove refriger ant based upon line length SUBCOOLING TXV BLOCK OUTDOOR COIL sometimes necessary with lower temperatures Use cardboard or plastic sheet to restrict the airflow through the outdoor coil to achieve pres sures from 325 375 psig 2240 2585 kPa Higher pressures are needed to check charge Block equal sections of air intake panels and move coverings sideways until the liquid pres sure is in the above noted ranges If refrigerant added or removed verify charge using the approach method If value is greater than shown remove refrigerant if less than shown add refrigerant SC Subcooling Values F 1 0 C 0 6 F C 018 024 030 036 042 048 060 Any 8 4 4 8 44 7 3 8 4 2 2 8 44 10 5 6 7 3 9 Temperature of air entering outdoor coil Page
25. iting scroll does not rotate or tum but merely orbits the stationary scroll The counterclockwise orbiting scroll draws gas into the outer crescent shaped gas pocket created by the two scrolls figure 6 1 The centrifugal action of the orbiting scroll seals off the flanks of the scrolls figure 6 2 As the orbiting motion contin ues the gas is forced toward the center of the scroll and the gas pocket becomes compressed figure 6 3 When the com pressed gas reaches the center it is discharged vertically into a chamber and discharge port in the top of the compressor figure 5 The discharge pressure forcing down on the top scroll helps seal off the upper and lower edges tips of the scrolls figure 5 During a single orbit several pockets of gas are compressed simultaneously providing smooth continuous compression The scroll compressor is tolerant to the effects of liquid return If liquid enters the scrolls the orbiting scroll is allowed to separate from the stationary scroll The liquid is worked toward the center of the scroll and is discharged If the compressor is replaced conventional Lennox cleanup practices must be used Due to its efficiency the scroll compressor is capable of draw ing a much deeper vacuum than reciprocating compressors Deep vacuum operation can cause internal fusite arcing resulting in damaged internal parts and will result in com pressor failure Never use a scroll compressor for eva cuating or
26. ors The capacitor is located inside the unit control box see figure 2 A single dual capacitor C12 is used for both the fan motor and the compressor see unit wiring diagram The fan side and the compressor side of the capacitor have different MFD ratings See side of capacitor for ratings 3 Timed Off Control TOC option The time delay is electrically connected between thermostat terminal Y and the compressor contactor Between cycles the compressor contactor is delayed for 5 minutes 2 min utes but may last as long as 8 minutes At the end of the delay the compressor is allowed to energize When thermo stat demand is satisfied the time delay opens the circuit to the compressor contactor coil and the compressor is de en ergized B Compressor The scroll compressor design is simple efficient and requires few moving parts A cutaway diagram of the scroll compressor is shown in figure 3 The scrolls are located in the top of the compressor can and the motor is located just below The oil lev el is immediately below the motor SCROLL COMPRESSOR DISCHARGE FIGURE 3 The scroll is a simple compression concept centered around the unique spiral shape of the scroll and its inherent properties Figure 4 shows the basic scroll form Two identical scrolls are mated together forming concentric spiral shapes figure 5 One scroll remains stationary while the other is allowed to orbit fig ure 6 Note that the orb
27. the condensing unit sweat connections to the indoor evaporator coil sweat connections Use Lennox L15 sweat series line sets as shown in table 1 TABLE 1 Liquid Suction 3 8 in 3 4 in E 10 mm 19 mm 4 6 m 15 m 3 8 in 7 8 in Nod 10 mm 22 mm 4 6 m 15 m 3 8 in 1 1 8 in Field 10 mm 29 mm Fabricated The liquid line and vapor line service valves figures 9 and 10 and gauge ports are accessible from the outside of the unit Use the service ports for leak testing evacuating charging and checking charge Each valve is equipped with a service port which has a facto ry installed Schrader valve A service port cap protects the Schrader valve from contamination and serves as the pri mary leak seal Service valves are not rebuildable If a valve has failed you must replace it To Access Schrader Port 1 Remove service port cap with an adjustable wrench 2 Connect gauge to the service port 3 When testing is complete replace service port cap Tight en finger tight then an additional 1 6 turn To Open Service Valve 1 Remove the stem cap with an adjustable wrench 2 Using the adjustable wrench to keep the valve station ary use a service wrench with a hex head extension to back the stem out counterclockwise as far as it will go NOTE Use a 3 16 hex head extension for 3 8 line sizes or a 5 16 extension for large line sizes 3 Replace the stem cap Tighten finger tight then tighten
Download Pdf Manuals
Related Search