Bryant Comprehensive Troubleshooting for Air Conditioners and Control Boards
Page 51

MODEL

PLUG

UTILITY RELAY *

UTILITY SIGNAL

OPEN RELAY

MODEL

PLUG

LLS

* SUPPLIED BY UTILITY PROVIDER

Liquid Line Solenoid

A06525/.A06526

Fig. 36 – 2-Stage Control Board

TROUBLESHOOTING

Troubleshooting (HK38EA003, 008, 010, 015) circuit boards.

The Evolution Series outdoor units all use the same control board. A model plug is used to identify the system type, and set the operating parameters for airflow, start circuit timing etc. (see Model Plug section) There were two part number changes to this board early in 2006 due to expansion of the Evolution split system product line, and expansion of the Evolution Small Packaged Product (SPP) line. This circuit board is used in both Evolution split system and Evolution SPP systems.

Replacement boards may have a different part number from the original board. A newer board will always be backward compatible to previous units if it is superseded at RCD. Old boards are not always forward compatible due to new functions, or software changes made to resolve field issues.

Systems Communication Failure

If communication with the Evolution control is lost with the User Interface, the control will flash the appropriate fault code. (See Table 17.) Check the wiring to the UI and the indoor and outdoor units.

Model Plug

Each control board contains a model plug. The correct model plug must be installed for or the system to operate properly. (See Table 14.)

The model plug is used to identify the type and size of unit to the control. On 286A models, the model plug is also used to determine the start sequence timing for each individual model.

On new units, the model and serial numbers are input into the board’s memory at the factory. If a model plug is lost or missing at initial installation, the unit will operate according to the information input at the factory and the appropriate error code will flash temporarily. An RCD replacement board contains no model and serial information. If the factory control board fails, the model plug must be transferred from the original board to the replacement board for the unit to operate.

NOTE: The model plug takes priority over factory model information input at the factory. If the model plug is removed after

initial power up, the unit will operate according to the last valid model plug installed, and flash the appropriate fault code temporarily.

Pressure Switch Protection

The outdoor unit is equipped with high- and low-pressure switches. If the control senses the opening of a high- or low-pressure switch, it will respond as follows:

1.De-energize the appropriate compressor contactor.

2.Keep the outdoor fan operating for 15 minutes.

3.Display the appropriate fault code (see Table 17).

4.After a 15 minute delay, if there is a call for cooling or heating and LPS or HPS is reset, the appropriate compressor contactor is energized.

5.If LPS or HPS has not closed after a 15 minute delay, the outdoor fan is turned off. If the open switch closes anytime after the 15 minute delay, then resume operation with a call for cooling or heating.

6.If LPS or HPS trips 3 consecutive cycles, the unit operation is locked out for 4 hours.

7.In the event of a high-pressure switch trip or high-pressure lockout, check the refrigerant charge, outdoor fan operation, and outdoor coil (in cooling) for airflow restrictions, or indoor airflow in heating.

8.In the event of a low-pressure switch trip or low-pressure lockout, check the refrigerant charge and indoor airflow (cooling) and outdoor fan operation and outdoor coil in heating.

Control Fault

If the outdoor unit control board has failed, the control will flash the appropriate fault code (see Table 17). The control board should be replaced.

Brown-Out Protection

If the line voltage is less than 187v for at least 4 seconds, the appropriate compressor contactor and fan relay are de-energized. Compressor and fan operation are not allowed until voltage is a minimum of 190v. The control will flash the appropriate fault code (see Table 17).

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Contents Application Guideline Table of ContentsSerial Number Nomenclature Table of Contents TWO Stage NON-COMMUNICATINGTWO Stage Communicating AIR Conditioner and Heat Pump Model Number NomenclatureSafety Considerations Installation GuidelineIntroduction Accessories Required Field-Installed Accessories for Air ConditionersRequired Field-Installed Accessories for Heat Pumps Accessory Descriptions LOW-AMBIENT Cooling Guideline Base / Mid-Tier / Deluxe 4-sided Baffle AssemblyDeluxe 3-sided Baffle Assembly and Dimensions Cabinet Assembly Long Line GuidelineBasic Cabinet Designs Access Compressor Or Other Internal Cabinet Components Legacy RNC and Legacy Line Control Box Identification Figure Labels LabelingCapacitor Aluminum WireElectrical ContactorTime-Delay Relay Crankcase HeaterCycle Protector Personal Injury Hazard Pressure SwitchesDefrost Control Board Defrost ThermostatIf defrost thermostat is stuck open Troubleshooting HK32EA001 If outdoor unit will not runDefrost Speedup If defrost thermostat is stuck closedHeating Five-Minute Compressor DelayQuiet Shift CoolingLow-Voltage Terminals Troubleshooting HK32EA003Fan Motor Compressor PlugRuns, Does Not Pump Compressor FailuresMechanical Failures Locked RotorSplit Post Grommet part number KA75UG100 Noisy CompressorSingle-Phase Motors Electrical FailuresUnit Personal Injury Hazard Refrigeration System RefrigerantCompressor Oil Oil Charging Synthetic Roof Precautionary ProcedureServicing Systems on Roofs With Synthetic Materials BrazingService Valves and Pumpdown Pumpdown ProcedurePersonal Injury and Unit Damage Hazard AccuRaterr Components Used in R-22 Heat Pumps Heating Piston AccuRaterr Heat Pumps OnlyReversing Valve Heating Mode, Solenoid De-Energized Reversing ValveInstall Liquid-line Filter Drier Indoor AC Liquid Line Filter DrierSuction Line Filter Drier Accumulator AccumulatorUnit Operation Hazard Install TXVThermostatic Expansion Valve TXV TXV OperationPersonal Injury and Environmental Hazard Make Piping ConnectionsReplacing TXV on an Indoor Coil pre-2006 Replacing TXV on Indoor Coil post-2006Fire Hazard Refrigeration System RepairLeak Detection Coil RemovalSystem Clean-Up After Burnout Compressor Removal and ReplacementCheck Charge EvacuationDeep Vacuum Method Low Superheat with High Suction Pressure Troubleshooting with SuperheatBasic Diagnostics Low Superheat with Normal or Low Suction PressureHigh Superheat with Normal or High Suction Pressure Hunting SuperheatPseudo Evaporator Superheat Instructions Example Puron System Suction Pressure Drop22 System Suction Pressure Drop Psig PuronrRefrigerant Pressure Temperature ChartPsig 22 Refrigerant Pressure Temperature RelationshipLiquid Line Temperature F Liq Press Subcooling F Psig Puron Subcooling ChartSuperheat F Psig Puron Superheat ChartLiquid Line Temperature F PT F Subcooling F Pres Psig 22 Subcooling Chart22 Superheat Chart Model Plug Information TWO-STAGEApplication Guidelines Model PlugAirflow Selection for 315AAV/355AAV Furnaces General InformationLow Ambient Cooling DefrostAll 286A units must be charged in high stage only Liquid-Line Solenoid AccessoryDefrost Hold Forced DefrostCompressor Operation on 286ANA/187ANA Models One Minute Stage Change Time Delay on 286ANA/187ANA ModelsCooling and Heating Operation Utility Interface With Evolution ControlOutdoor Fan Motor Operation ECM Fan Motor TroubleshootingTime Delays Muffler, Accumulator, Reversing Valve RVSThermistors Control BOX Troubleshooting Contactor Shorted Detection 230V Line Power Disconnect Detection230v Brown-Out Protection Defeated Compressor Voltage SensingThermistor Sensor Comparison Unloader Test ProcedureTemperature Thermistors Failed Thermistor Default OperationStatus Codes TroubleshootingEdge Thermidistat Models T6-PRH-01 or T6-NRH-01 TWO-STAGE 286B/289B/180B/187B General Information All 286B units must be charged in high stage only Heating Check Chart ProcedureCompressor Operation on 289B/180B Models Low Stage High Stage Low & High Model Contactor And Capacitor Incoming PowerTroubleshooting 187B & 286B Start Circuit Control BoxTroubleshooting HK38EA015 circuit board 289B Compressor Thermal Cutout 286B Models Compressor Thermal CutoutOutdoor Coil Thermistor OCT Attachment Status Codes Single Stage Furnace with 2-Stage Air Conditioner Airflow Selection for FV4C Fan Coils non-communicating TWO Stage NON-COMMUNICATING 127A/226AOperating Ambient Airflow Selections ECM FurnacesSystem Function and Sequence of Operation Compressor OperationDefrost Speedup Check Charge TWO Stage Communicating 167A/266A Airflow Selections for ECM Furnaces non communicatingIndoor Thermostat Control Options Defrost Hold Evolution Controlled Low Ambient CoolingMajor Components Communication and Status Function Lights Outdoor Fan Motor OperationFor Evolution Control only, Green communications Comm Light 2230V Brown-Out Protection Defeated Thermistor Curve No 230V at Compressor ContactorOutdoor Coil Thermistor OCT Attachment Status Codes 167A / 266A TroubleshootingCare and Maintenance Puronr R-410A Refrigerant Quick Reference Guide Final Check-OutAIR Conditioner Troubleshooting Chart Heat Pump Troubleshooting Heating Cycle Heat Pump Troubleshooting Cooling Cycle TWO-STAGE 286B/288B 180B/187B Index of TablesDescription Table # TWO-STAGE 286A/288A 180A/187ACatalog No. SM01---6
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R-22 specifications

The Bryant R-22 stands out in the landscape of residential heating and cooling systems with its combination of efficiency, durability, and modern technology. Designed primarily for homeowners seeking comfortable climate control solutions, the R-22 model delivers consistent performance throughout varying seasonal extremes.

One of the main features of the Bryant R-22 is its high energy efficiency. Rated with a SEER (Seasonal Energy Efficiency Ratio) that meets or exceeds industry standards, this air conditioning unit is designed to reduce energy consumption while providing optimal cooling. This not only helps in lowering monthly utility bills but also promotes environmentally responsible usage.

Another notable characteristic is the unit's durability. Constructed with a robust cabinet and high-quality components, the R-22 is built to withstand the rigors of daily use, with protective features that enhance its longevity. The cabinet comes with a powder-coated finish that resists corrosion and harsh weather conditions, ensuring that the unit stays functional and aesthetically pleasing for years.

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For added convenience, the Bryant R-22 is compatible with various thermostat options, including Wi-Fi-enabled models. This allows users to control their home's climate from anywhere using a smartphone app, facilitating effortless adjustments and monitoring of energy usage.

Finally, the Bryant R-22 is backed by a solid warranty, providing peace of mind for homeowners. This commitment to quality and customer satisfaction is a testament to Bryant’s dedication to producing reliable and efficient HVAC solutions. Overall, the Bryant R-22 is an exemplary choice for those looking to enhance their home comfort with the latest in HVAC technology.
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