Carrier 24ANB7, 24ANB1 Service Manual

Application Guidelineand Service ManualResident ial Air Conditio ner s and Heat PumpsU s i n g R --- 2 2 a n d P u r o n r RefrigerantTABLE OF CONTENT

10LabelingWiring LabelRating PlateCharging LabelCaution Label(3-phase only)Warning LabelPiston LabelMid ---Tier / DeluxeWiring LabelRating PlateChargi

11ELECTRICALELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.Exercise extreme caution when working on any

12Use following formula to calculate capacitance:Capacitance (mfd)= (2650 X amps)/volts3. Remove any capacitor that shows signs of bulging, dents, orl

13Pressure SwitchesPressure switches are protective devices wired into control circuit(low voltage). They shut off compressor if abnormally high or lo

14Defrost ThermostatDefrost thermostat signals heat pump that conditions are right fordefrost or that conditions have changed to terminate defrost. It

15Troubleshooting (HK32EA001)If outdoor unit will not run:1. Does the Y input has 24 volts from thermostat? If not,check thermostat or wire. If yes pr

1614. Remove jumper between DFT and R terminals. Reconnectdefrost thermostat leads. Failure to remove jumper causesunit to switch to defrost every 30,

17If the defrost thermostat is closed, a complete defrost cycle isinitiated. If the Quiet Shift switch is turned on, the compressor willbe turned off

18COPELAND SCROLL COMPRESSORScroll Gas FlowCompression in the scroll iscreated by the interaction ofan orbiting spiral and a stationary spiral. Gas en

19If replacement is deemed necessary, perform the following to replace sensor:1. Locate top cap and discharge temperature sensorA123422. Carefully rem

2UNIT IDENTIFICATIONTroubleshooting Charts for Air Conditioners and Heat Pumps areprovided in the appendix at back of this manual. They enable theserv

20COMPRESSOR TROUBLESHOOTINGCompressor FailuresCompressor failures are classified in 2 broad failure categories;mechanical and electrical. Both types

219. If a compressor hums but won’t start it could indicate eithera voltage or amperage issue. Verify adequate voltage andoperational start components

22Electrical FailuresThe compressor mechanical pump is driven by an electric motorwithin its hermetic shell. In electrical failures, compressor does n

23REFRIGERATION SYSTEMRefrigerantUNIT OPERATION AND SAFETY HAZARDFailure to follow this warning could result in personal injuryor equipment damage.Pur

24Before brazing the line set to the valves, the belled ends of thesweat connections on the service valves must be cleaned so that nobrass plating rem

25Heating Piston (AccuRaterr) -- Heat Pumps OnlyIn this product line, AccuRater pistons are used to meter refrigerantfor heat pump heating mode only.

26ReversingValveIn heat pumps, changeover between heating and cooling modes isaccomplished with a valve that reverses flow of refrigerant insystem. Th

27Liquid Line Filter DrierFilter driers are specifically designed for R--22 or Puronrrefrigerant. Only operate with the appropriate drier using factor

28AccumulatorThe accumulator is specifically designed to operate with Puronror R22 respectfully; use only factory--authorized components.Under some li

29Thermostatic Expansion Valve (TXV)All fan coils and furnace coils will have a factory installedthermostatic expansion valve (TXV). The TXV will be a

3SAFETY CONSIDERATIONSInstallation, service, and repair of these units should be attemptedonly by trained service technicians familiar with standard s

30Replacing TXV on an Indoor Coil(pre--2006)1. Pump system down to 2 psig and recover refrigerant.2. Remove coil access panel and fitting panel from f

31REFRIGERATION SYSTEM REPAIRLeak DetectionNew installations should be checked for leaks prior to completecharging. If a system has lost all or most o

32Compressor Removal and ReplacementOnce it is determined that compressor has failed and the reasonestablished, compressor must be replaced.PERSONAL I

33EvacuationProper evacuation of the system will remove non--condensiblesand assure a tight, dry system before charging. The two methodsused to evacua

34TROUBLESHOOTING WITH SUPERHEATThis troubleshooting routine was developed to diagnose coolingproblems using superheat in TXV systems. It is effective

35High Superheat with Normal or High SuctionPressureNOTE: Normal to High suction pressure is consideredfor R--22: > ∼65 psig, Puron: > ∼110 psig

36Table 5—Puron System Suction Pressure DropNominalSize(Btuh)Suction LineOD(in.)PressureDrop(psi/100 ft)SuctionVelocityfpmPuron Suction Line Pressure

37Table 6—R--22 System Suction Pressure DropNominalSize(Btuh)LineOD(in.)PressureDrop(psi/100 ft)SuctionVelocityFpmR---22 Suction Line Pressure Drop (p

38Table 7—Puronr Refrigerant Pressure Temperature ChartPSIGPSIG°FPSIG°FPSIG°FPSIG°FPSIG°FPSIG°F12 --38.2 118 39.9 224 76.9 330 102.9 436 123.3 542 140

39Table 8—R--22 Refrigerant Pressure Temperature Relationshippsig°Fpsig°Fpsig°Fpsig°Fpsig°Fpsig°Fpsig°F7 --25.9 71 41.7 135 76.2 199 101.1 263 120.9 3

4ACCESSORIESTable 1—Required Field--Installed Accessories for Air ConditionersACCESSORYREQUIRED FOR LOW--- AMBIENTCOOLING APPLICATIONS(Below 55°F/12.8

40Table 9—Puron Subcooling Chart2 4 6 8 10 12 14 16 18 20200 70 68 66 64 62 60 58 56 54 52 50210 73 71 69 67 65 63 61 59 57 55 53220 76 74 72 70 68 66

41Table 10—Puron Superheat Chart2 4 6 8 10 12 14 16 18 20 22 24 26 28 3080 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 5182 22 24 26 28 30 32 34 36 3

42Table 11—R--22 Subcooling Chart2 4 6 8 10 12 14 16 18 20 22 24 26120 70 68666462605856545250484644125 72 70686664626058565452504846130 74 7270686664

43Table 12—R--22 Superheat Chart2 4 6 8 10 12 14 16 18 20 22 24 26 28 3050 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 5651 27 29 31 33 35 37 39 41 4

44TWO--STAGE 25HNB/24ANBApplication GuidelinesCarrier designed and tested the two--stage air conditioner and heatpump products with Puron refrigerant

45Airflow Selections for 24ANB7 / 25HNB6 /24ANB1 /25HNB9 Using Non--Communicating(Non--Infinity) ThermostatsAirflow Selection for 58CVA/58MVB Furnaces

46S The ODF fan delay defeat can be toggled by shorting theforced defrost pins for >15 seconds while in the standbymode (status LED on solid). The

47refrigerant charge may not be correct. Do not use chart to adjustrefrigerant charge.NOTE: In heating mode, check refrigerant charge only whenpressur

48The outdoor Integral Control Motor (ECM), is a variable--speedmotor which operates from 450 to 850 rpm. The motor is a dcpermanent magnet--type moto

49Muffler, Accumulator, Reversing Valve (RVS)The Puronr two--stage air conditioners and heat pumps have acompressor discharge line muffler, to dampen

5ACCESSORY DESCRIPTIONSRefer to Table 1 for an Accessory Usage Guide for AirConditioners and Table 2 for Heat Pumps. Refer to the appropriatesection b

50UTILITY RELAY *UTILITY SIGNALOPEN RELAY* SUPPLIED BY UTILITY PROVIDERA B CA B CA12260LLSLiquid Line SolenoidA B CA B CA12261Fig. 33 – 2

51230v Brown--Out Protection DefeatedThe brownout feature can be defeated if needed for severe noisypower conditions. This defeat should always be a l

52Temperature ThermistorsThermistors are electronic devices which sense temperature. As thetemperature increases, the resistance decreases. Thermistor

53Table 15—Two--Stage Compressor Resistances(Winding Resistance at 70_F±20_)Winding 024 036 048 060Start (S--C) 1.64 1.52 1.86 1.63Run (R--C) 1.30 0.8

54OORVS Cooling O/B W2 W1 W1Heat Stage 3 W/W1 W2Heat/Cool Stage 1 Y1 / W2 Y1 Y1Heat/Cool Stage 2 Y/Y2 Y/Y2 Y2Fan G G24VAC Hot Heating Rh R24VAC Hot Co

55TWO STAGE NON--COMMUNICATING24ACB7/25HCB6These units are a low cost 2--stage option that isnon--communicating utilizing 2 stage scroll technology. T

56SYSTEM FUNCTION AND SEQUENCEOF OPERATION (24ACB7/25HCB6)NOTE: Defrost control board is equipped with 5 minute lockouttimer that is initiated upon an

57OF2OF1ONQUIETSHIFT1203060603090INTERVAL TIMEROFFP3DFTO R W2 Y CT2 C C ODFTT1 YP1J1SPEEDUPSpeedupPinsDefrost intervalDIP switchesQuietShif

58CARE AND MAINTENANCETo assure high performance and minimize possible equipmentmalfunction, it is essential that maintenance be performedperiodically

59Electrical Controls and Wiring1. Disconnect power to both outdoor and indoor units.2. Check all electrical connections for tightness. Tighten allscr

6LOW--AMBIENT COOLING GUIDELINEThe minimum operating temperature for these units in coolingmode is 55_F/12.7_C outdoor ambient without additionalacces

60NO COOLING ORINSUFFICIENTCOOLINGCOMPRESSORWILL NOT RUNCONTACTOROPENPOWER SUPPLYDEFECTIVELOW-VOLTAGETRANSFORMEROPENTHERMOSTATOPEN CONTROLCIRCUITLOSS

61NO HEATING ORINSUFFICIENTHEATINGCOMPRESSORWILL NOT RUNCONTACTOPENDEFECTIVE LOW-VOLTAGETRANSFORMERREMOTECONTROLCENTERDEFECTIVECONTACTORCOIL OPEN ORSH

62NO COOLING ORINSUFFICIENTCOOLINGCOMPRESSORWILL NOT RUNCONTACTOROPENPOWER SUPPLYDEFECTIVELOW-VOLTAGETRANSFORMEROPENTHERMOSTATOPEN CONTROLCIRCUITLOSS

63INDEX OF TABLESDESCRIPTION TABLE #Required Field--Installed Accessories for Air Conditioners 1...

64Copyright 2012 Carrier Co rp. S 7310 W. Morris St. S Indianapolis, IN 46231Manufacturer reserves the right to change, at any time, specifications an

7LONG LINE GUIDELINERefer to Residential Piping and Long Line Guideline for airconditioner and heat pump systems using Puron refrigerant orLong Line G

8Access Compressor Or Other Internal Cabinet ComponentsNOTE: It is not necessary to remove the top cover to gain access.Removing the top cover may cau

9Base and Comfort Series AC Control BoxBase and Comfort HP Control BoxFig. 4 – Base and Comfort Series Control Box Identification