Bryant R-22 service manual Cooling and Heating Operation, Utility Interface With Evolution Control

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SYSTEM FUNCTIONS AND SEQUENCE OF OPERATION

The outdoor unit control system has special functions. The following is an overview of the two-stage control functions:

Cooling and Heating Operation

286A/187ANA and 288ANA/180ANA (with serial numbers starting with 3809 and later) utilize either a standard indoor thermostat or Evolution Communication User Interface. 288ANA/180ANA utilize an Evolution communicating User Interface only. With a call for first stage cooling, the outdoor fan, reversing valve, and low stage compressor are energized. If low-stage cannot satisfy cooling demand, high-stage cooling is energized by the second stage of indoor thermostat or User Interface. After second stage is satisfied, the unit returns to low-stage operation until first stage is satisfied or until second stage is required again. When both first stage and second stage cooling are satisfied, the compressor will shut off. The reversing valve will remain energized until the control board power is removed or a call for heating in initiated. With a call for heating, the outdoor fan and compressor are energized. The compressor will operate in high or low stage operation, as needed to meet the heating demand. When the heating demand is satisfied, the compressor and fan will shut off. The reversing valve is de-energized in the heating mode.

NOTE: When two-stage unit is operating at low-stage, system vapor (suction) pressure will be higher than a standard single-stage system or high-stage operation.

NOTE: Outdoor fan motor will continue to operate for one minute after compressor shuts off, when outdoor ambient is greater than or equal to 100°F. This reduces pressure differential for easier starting on next cycle.

NOTE: On 286ANA/187ANA models, if unit has not operated within the past 12 hours, or following a unit power-up, upon the next thermostat high- or low-stage demand, unit operates for a minimum of 5 minutes in high-stage.

On 286ANA/187ANA models with non-communicating (non-Evolution) systems, with first stage of cooling, Y1 and O are powered on; and with second stage of cooling, Y1, Y2, and O are on. For these systems, with first stage of heating Y1 is on and for second stage of heating, Y1 and Y2 are on. When the reversing valve is energized, O is powered on.

Communication and Status Function Lights For Evolution Control only, Green communications (COMM) Light

A green LED (COMM light) on the outdoor board indicates successful communication with the other system products. The green LED will remain OFF until communication is established. Once a valid command is received, the green LED will turn ON continuously. If no communication is received within 2 minutes, the LED will be turned OFF until the next valid communication.

Amber Status Light

An amber colored STATUS light is used to display the operation mode and fault codes as specified in the troubleshooting section. See Table 17 for codes and definitions.

NOTE: Only one code will be displayed on the outdoor unit control board (the most recent, with the highest priority).

Utility Interface With Evolution Control

The utility curtailment relay should be wired between R and Y2 connections on the control board for Evolution Communicating systems only (see Fig. 42.) This input allows a power utility device to interrupt compressor operation during peak load periods. When the utility sends a signal to shut the system down, the User Interface will display, “Curtailment Active”.

One Minute Stage Change Time Delay on 286ANA/187ANA Models

When compressor changes stages from high to low or low to high, there is a 1-minute time delay before compressor restarts. The outdoor fan motor remains running.

Compressor Operation on 286ANA/187ANA Models

These units contain a Bristol 2-stage reciprocating compressor. When the compressor operates in high stage operation, the compressor motor rotates clockwise. Both the lower and upper pistons are eccentric with the rotating crankshaft and both compress refrigerant.

When the compressor operates in low stage operation, the compressor motor reverses direction (rotates counterclockwise). The lower piston becomes idle and the upper piston compresses refrigerant. The start and run windings are reversed.

Crankcase Heater Operation

The two-stage reciprocating compressor does not have a replaceable CCH available. It is recommended to disconnect, electronically, the faulty CCH and add a belly band style CCH should a CCH failure be determined.

Compressor Operation on 288ANA/180ANA Models:

The basic scroll design has been modified with the addition of an internal unloading mechanism that opens a bypass port in the first compression pocket, effectively reducing the displacement of the scroll. The opening and closing of the bypass port is controlled by an internal electrically operated solenoid.

The modulated scroll uses a single step of unloading to go from full capacity to approximately 67% capacity. A single speed, high efficiency motor continues to run while the scroll modulates between the two capacity steps. Modulation is achieved by venting a portion of the gas in the first suction pocket back to the low side of the compressor, thereby reducing the effective displacement of the compressor. Full capacity is achieved by blocking these vents, thus increasing the displacement to 100%. A DC solenoid in the compressor controlled by a rectified 24 volt AC signal in the external solenoid plug moves the slider ring that covers and uncovers these vents. The vent covers are arranged in such a manner that the compressor operates at approximately 67% capacity when the solenoid is not energized and 100% capacity when the solenoid is energized.

The loading and unloading of the two step scroll is done “on the fly” without shutting off the motor between steps.

NOTE: 67% compressor capacity translates to approximately 80% cooling or heating capacity at the indoor coil. The compressor will always start unloaded and stay unloaded for five seconds even when the thermostat is calling for high stage.

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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 NomenclatureIntroduction Safety ConsiderationsInstallation Guideline Required Field-Installed Accessories for Heat Pumps AccessoriesRequired Field-Installed Accessories for Air Conditioners Accessory Descriptions LOW-AMBIENT Cooling Guideline Base / Mid-Tier / Deluxe 4-sided Baffle AssemblyDeluxe 3-sided Baffle Assembly and Dimensions Basic Cabinet Designs Cabinet AssemblyLong Line Guideline Access Compressor Or Other Internal Cabinet Components Legacy RNC and Legacy Line Control Box Identification Figure Labels LabelingCapacitor Aluminum WireElectrical ContactorCycle Protector Time-Delay RelayCrankcase Heater 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 CompressorUnit Personal Injury Hazard Single-Phase MotorsElectrical Failures Compressor Oil Refrigeration SystemRefrigerant Oil Charging Synthetic Roof Precautionary ProcedureServicing Systems on Roofs With Synthetic Materials BrazingPersonal Injury and Unit Damage Hazard Service Valves and PumpdownPumpdown Procedure AccuRaterr Components Used in R-22 Heat Pumps Heating Piston AccuRaterr Heat Pumps OnlyReversing Valve Heating Mode, Solenoid De-Energized Reversing ValveSuction Line Filter Drier Install Liquid-line Filter Drier Indoor ACLiquid 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 ReplacementDeep Vacuum Method Check ChargeEvacuation Low Superheat with High Suction Pressure Troubleshooting with SuperheatBasic Diagnostics Low Superheat with Normal or Low Suction PressurePseudo Evaporator Superheat Instructions High Superheat with Normal or High Suction PressureHunting Superheat 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 TroubleshootingThermistors Time DelaysMuffler, Accumulator, Reversing Valve RVS 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 FurnacesDefrost Speedup System Function and Sequence of OperationCompressor Operation Check Charge Indoor Thermostat Control Options TWO Stage Communicating 167A/266AAirflow Selections for ECM Furnaces non communicating Defrost Hold Evolution Controlled Low Ambient CoolingMajor Components For Evolution Control only, Green communications Comm Light Communication and Status Function LightsOutdoor Fan Motor Operation 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.

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