Service Manual - Carrier

1 Service ManualTable of contentsPAGE IDENTIFICATION .. 2 SAFETY CONSIDERATIONS .. 2 General information .. 2 ELECTRICAL .. 3 Aluminum Wire .. 3 ELECTRICAL SYSTEM OVERVIEW .. 3 Terminal Block .. 3 Transformer .. 3 compressor / Fan Sub-System .. 3 Variable Frequency Drive (VFD).. 5 VFD Filter Board .. 5 Reactors .. 5 High Pressure Switch (HPS).. 5 compressor Brushless Permanent Magnet Motor (BPM) .. 5 VFD + compressor BPM .. 5 Fan Brushless Permanent Magnet Motor (BPM) .. 5 VFD + Fan BPM.. 5 Crankcase Heater .. 5 CONTROL SUB-SYSTEM.. 5 Primary Control Module (PCM).. 5 Control Connection (Communicating and Non-Communicating). 5 Communicating Infinity Control .. 5 Non-Communicating Control .. 6 Table 1 DIP Swtich Settings.. 6 PCM Indicators and Matrix Display.. 6 Model Plug .. 8 Thermistors.. 8 Pressure Sensors .. 8 VFD Control Connection.. 8 Pressure Equalization Valve (PEV) .. 8 Reversing Valve (RVS) .. 8 Heating Electronic Expansion Valve (EXV-H).

2 8 Bluetooth Module .. 8 Accessory Control Components.. 8 Utility Curtailment .. 8 Liquid Line Solenoid Valve (LLS).. 8 CONTROL FEATURES AND OPERATION.. 9 Equipment Configuration (Model Plug) .. 9 Performance Mode.. 9 compressor Operation .. 9 compressor Protect Delay .. 9 Starting .. 9 Running.. 9 compressor Reliability Protection .. 9 Sump Heat.. 9 Fan Operation .. 9 Intermittent Low Fan Speed .. 9 Fan Operating Exceptions.. 9 Cooling Control .. 9 Heating Control .. 9 Super Heat Control .. 9 Defrost Mode.. 9 Defrost Interval.. 10 Defrost Process.. 10 PCM Indicators and Display Operation.. 10 Status Light.. 10 Comm Light .. 10 VFD Comm Light.. 10 Matrix Display .. 10 Reprogrammability.. 10 TROUBLESHOOTING .. 11 TROUBLESHOOTING CONTROL FEATURES .. 11 SYSTEM DIAGNOSTICS .. 11 Table 2 Model Plug Information.. 12 COMPONENT DIAGNOSTICS.. 12 Table 3 Variable Speed compressor Resistances (ohm)(winding resistance at 68 F /20 C).

3 12 Table 4 DC Voltage and PWM Measurement .. 13 Table 5 Thermistor Resistance (k-ohms) vs. Temperature.. 13 DIAGNOSTIC CODES AND TROUBLESHOOTING .. 15 Table 6 Fault Code Table .. 25 REFRIGERATION SYSTEM .. 34 Refrigerant .. 34 compressor Oil .. 34 Servicing Systems on Roofs With Synthetic Materials.. 34 Synthetic Roof Precautionary Procedure .. 34 Brazing.. 34 Service Valves and Pumpdown .. 34 Pumpdown & Evacuation.. 35 Pump Down .. 35 Evacuation and Recovery of Refrigerant from 25 VNA4 .. 35 Reversing Valve (25 VNA4) .. 35 Liquid Line Filter Drier .. 36 Install Liquid-line Filter Drier Indoor.. 36 Suction Line Filter Drier .. 36 Thermostatic Expansion Valve (TXV) .. 36 TXV Operation.. 37 Accumulator.. 37 Vapor Injection Operation (5 Ton Models) .. 37 Vapor Injection Electronic Exp. Valve (EXV VI)(5 Ton Models) .. 38 REFRIGERATION SYSTEM REPAIR.. 38 Leak Detection.. 38 Coil Removal.. 3824 VNA6 / 25 VNA4 Infinity SeriesVariable Speed Air conditioner and Heat Pumpwith Greenspeed Intelligence2 to 5 Nominal Tons24 VNA6 / 25 VNA4: Service ManualManufacturer reserves the right to change, at any time, specifications and designs without notice and without IDENTIFICATIONThe unit is identified using a 16 digit model number structure.

4 It is recommended providing the complete 16 digit model number when orderingreplacement parts to insure receiving the correct CONSIDERATIONSI nstallation, Service , and repair of these units should be attempted onlyby trained Service technicians familiar with standard Service instructionand training equipment should be installed in accordance with accepted practicesand unit Installation Instructions, and in compliance with all national andlocal codes. Power should be turned off when servicing or repairingelectrical components. Extreme caution should be observed whentroubleshooting electrical components with power on. Observe allwarning notices posted on equipment and in instructions or systems contain refrigerant under pressure. Extremecaution should be observed when handling refrigerants. Wear safetyglasses and gloves to prevent personal injury. During normal systemoperations, some components are hot and can cause burns.

5 Rotating fanblades can cause personal injury. Appropriate safety considerations areposted throughout this Manual where potentially dangerous techniquesare you do not understand any of the warnings, contact your productdistributor for better interpretation of the warnings. General informationThe Greenspeed Intelligence heat pump and air conditioner features thelatest variable speed technology. The heart of the system is the Samsunghigh side rotary or scroll variable speed compressor powered through theuse of the Samsung variable frequency drive (VFD) control. Bycombining the Primary Control Module (PCM), an ECM outdoor fan,Samsung VFD, Samsung variable speed compressor and the InfinitySeries outdoor cabinet, the HP unit achieves a Seasonal EnergyEfficiency Ratio (SEER) of up to 24 and up to 13 Heating SeasonalPerformance Factor (HSPF) and the AC achieves up to 26 ensure all of the above technology provides the ultimate in comfort, itis combined with either a fan coil or Variable Speed Gas furnacecontrolled with a two wire communication Infinity wall Number Nomenclature123 45 6 7891011 12 1314151624 V N A6 36 A 0 0 3 00 0 0 Product SeriesProduct FamilyTierMajor SeriesSEERC ooling Capacity 1,000 Btuh (nominal)

6 Variations Open OpenVoltageMinor SeriesOpenCompressor IdentificationOpen24=AC25=HPV=Variable SpeedInfinity SeriesA = Puron6 = Up to 26 SEER4 = Up to 24 SEERA = Standard0=Not Defined0=Not Defined3=208/230-10=Not Defined4=VS Scroll5=VS Rotary0=Not DefinedSERIAL NUMBER NOMENCLATURE0118E00001 Week of ManufacutreSerial NumberYear of ManufactureManufacturing SiteE = Collierville, TNX = Nonterey MexicoWARNING!ELECTRICAL SHOCK HAZARDF ailure to follow this warning could result in personal injury or installing, modifying, or servicing system, main electricaldisconnect switch must be in the OFF position. There may be more than1 disconnect switch. Lock out and tag switch with a suitable warninglabel. WARNING!ELECTRICAL HAZARD - HIGH VOLTAGE!Failure to follow this warning could result in personal injury or components may hold charge. DO NOT remove control boxcover for 2 minutes after power has been removed from TO TOUCHING ELECTRICAL COMPONENTS:Verify less than 20 vdc voltage at VFD connections shown on !

7 CUT HAZARDF ailure to follow this caution may result in personal metal parts may have sharp edges or burrs. Use care and wearappropriate protective clothing and gloves when handling !UNIT OPERATION AND SAFETY HAZARDF ailure to follow this warning could result in personal injury orequipment (R-410A) systems operate at higher pressures than standardR-22 systems. Do not use R-22 Service equipment or components onPuron equipment. Ensure Service equipment is rated for Puron .24 VNA6 / 25 VNA4: Service ManualManufacturer reserves the right to change, at any time, specifications and designs without notice and without WireWhenever aluminum wire is used in branch circuit wiring with this unit,adhere to the following recommendations. Connections must be made in accordance with the National ElectricalCode (NEC), using connectors approved for aluminum wire. Theconnectors must be UL approved (marked Al/Cu with the UL symbol)for the application and wire size.

8 The wire size selected must have acurrent capacity not less than that of the copper wire specified, and mustnot create a voltage drop between Service panel and unit in excess of 2 ofunit rated voltage. To prepare wire before installing connector, allaluminum wire must be brush-scratched and coated with a corrosioninhibitor such as Pentrox A. When it is suspected that connection will beexposed to moisture, it is very important to cover entire connectioncompletely to prevent an electrochemical action that will causeconnection to fail very quickly. Do not reduce effective size of wire,such as cutting off strands so that wire will fit a connector. Proper sizeconnectors should be used. Check all factory and field electricalconnections for tightness. This should also be done after unit has reachedoperating temperatures, especially if aluminum conductors are SYSTEM OVERVIEWThe electrical system consists of four main primary components andsub-systems as listed below and shown in Fig.

9 1. Terminal Block Transformer compressor and Fan Sub-System Control Sub-SystemA200232 Fig. 1 ELECTRICAL SYSTEM OVERVIEWT erminal BlockThe terminal block provides the connection point for high voltage fieldpower wiringTransformerIMPORTANT: The 24 VAC power (Rc) in the PCM comes from thetransformer in the equipment. The phase of this transformer connectionis not controlled relative to the phase of the power provided by thetransformer in the indoor equipment (Rh). Wiring requirements in thismanual do not connect Rc and Rh together. For any non-standardwiring, care should be taken to make sure that Rc and Rh are notconnected together. Doing so may result in destroying one or both of thetransformers in this and the indoor transformer converts line voltage power to low voltage powerrequired by the control system. The transformer also provides isolationbetween the line voltage and low voltage / Fan Sub-SystemThe compressor / fan subsystem consists of the following components: Variable speed compressor Variable speed fan Variable Frequency Drive (VFD) sub-system for driving thecompressor and fanThe VFD sub-system consists of several components that are shownconceptually in Fig.

10 2 with detailed wiring shown in Fig. 3. Thefunction of each component is described in further detail in the !ELECTRICAL SHOCK HAZARDF ailure to follow this warning could result in personal injury or extreme caution when working on any electrical off all power to system prior to troubleshooting. Sometroubleshooting techniques require power to remain on. In theseinstances, exercise extreme caution to avoid danger of electrical TRAINED Service PERSONNEL SHOULD PERFORMELECTRICAL !UNIT OPERATION AND SAFETY HAZARDF ailure to follow this caution may result in equipment damage orimproper wire may be used in the branch circuit (such as the circuitbetween the main and unit disconnect), but only copper wire may beused between the unit disconnect and the !Equipment Damage HazardFailure to follow this caution may result in equipment damage orimproper not connect the equipment 24 VAC supply (Rc) to the indoorequipment 24 VAC supply (Rh).