Bryant Understanding Two-Stage Air Conditioners and Their Key Specifications
Page 56

TWO-STAGE 286B/289B/180B/187B

Application Guidelines

Bryant designed and tested the two-stage air conditioner and heat pump products with Puron refrigerant to operate at a minimum outdoor operating ambient in cooling mode at 55_F without low ambient cooling enabled and the maximum outdoor operating

ambient in cooling is 125_F/51.6_C. On Evolution communicating systems, only low ambient cooling is available to 0_F/-17.8_C.

The maximum outdoor operating ambient in heating mode is 66_F/18.8_C on all heat pumps. Continuous operation in heating mode is approved to -30_F/-34.4_C. Thermostat options for the two stage units are as follows:

SA,B,C,D four-wire connections for Evolution User Interface.

SR,C,W,Y1,Y2, and O wire connections for standard, non-communicating thermostat.

286BNA, 289B, 187B, and 180B units can run, and are matched with, User Interface (UI) communicating and non-communicating indoor fan coils and furnaces. Only unit combinations listed in the two-stage Product Data are recommended.

Line sets for two stage units are similar to the single stage units. However, some restrictions may apply to specific combinations in long line applications. Refer to the Long Line Guideline for further information.

The Tennessee Valley Authority (TVA) requires that electric strip heat have a lockout feature. This is achieved through Bryant thermostats required per above and must be used on all TVA approved units.

The new control board in the two stage units with Puron refrigerant has dip switches for defrost timing. The Evolution controls provide these two stage units with high stage latching and Hybrid Heatt (dual fuel) capabilities. The standard Hybrid Heatt (duel fuel) thermostat can be used on two stage units with Bristol reciprocating compressors only.

Model Plug

Each control board contains a model plug. The correct model plug must be installed in order for the system to operate properly. (See Table 18.)

The model plug is used to identify the type and size of unit to the control. On 286BNA 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 inputted 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.

Table 18—Model Plug Information

 

MODEL

PIN RESISTANCE

MODEL

(K---ohms)

PLUG

NUMBER

 

 

NUMBER

 

 

 

Pins 1---4

Pins 2---3

 

 

 

 

 

 

286BNA024

HK70EZ041

18

91

 

 

 

 

286BNA036

HK70EZ043

18

150

 

 

 

 

286BNA048

HK70EZ045

18

220

 

 

 

 

286BNA060

HK70EZ047

18

360

 

 

 

 

 

 

 

 

289BNA036

HK70EZ012

5.1

180

 

 

 

 

289BNA048

HK70EZ014

5.1

270

 

 

 

 

289BNA060

HK70EZ016

11

5.1

 

 

 

 

 

 

 

 

180BNA024

HK70EZ009

5.1

91

 

 

 

 

180BNA036

HK70EZ011

5.1

150

 

 

 

 

180BNA048

HK70EZ013

5.1

220

 

 

 

 

180BNA060

HK70EZ015

5.1

360

 

 

 

 

 

 

 

 

187BNA024

HK70EZ040

18

75

 

 

 

 

187BNA036

HK70EZ042

18

120

 

 

 

 

187BNA048

HK70EZ044

18

180

 

 

 

 

187BNA060

HK70EZ046

18

270

 

 

 

 

56

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Contents Table of Contents Application GuidelineTable of Contents TWO Stage NON-COMMUNICATING TWO Stage CommunicatingAIR Conditioner and Heat Pump Model Number Nomenclature Serial Number NomenclatureIntroduction Safety ConsiderationsInstallation Guideline Required Field-Installed Accessories for Heat Pumps AccessoriesRequired Field-Installed Accessories for Air Conditioners Accessory Descriptions Base / Mid-Tier / Deluxe 4-sided Baffle Assembly LOW-AMBIENT Cooling GuidelineDeluxe 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 Labeling Figure LabelsAluminum Wire ElectricalContactor CapacitorCycle Protector Time-Delay RelayCrankcase Heater Pressure Switches Personal Injury HazardDefrost Thermostat Defrost Control BoardTroubleshooting HK32EA001 If outdoor unit will not run Defrost SpeedupIf defrost thermostat is stuck closed If defrost thermostat is stuck openFive-Minute Compressor Delay Quiet ShiftCooling HeatingTroubleshooting HK32EA003 Fan MotorCompressor Plug Low-Voltage TerminalsCompressor Failures Mechanical FailuresLocked Rotor Runs, Does Not PumpNoisy Compressor Split Post Grommet part number KA75UG100Unit Personal Injury Hazard Single-Phase MotorsElectrical Failures Compressor Oil Refrigeration SystemRefrigerant Synthetic Roof Precautionary Procedure Servicing Systems on Roofs With Synthetic MaterialsBrazing Oil ChargingPersonal Injury and Unit Damage Hazard Service Valves and PumpdownPumpdown Procedure Heating Piston AccuRaterr Heat Pumps Only AccuRaterr Components Used in R-22 Heat PumpsReversing Valve Reversing Valve Heating Mode, Solenoid De-EnergizedSuction Line Filter Drier Install Liquid-line Filter Drier Indoor ACLiquid Line Filter Drier Accumulator AccumulatorInstall TXV Thermostatic Expansion Valve TXVTXV Operation Unit Operation HazardMake Piping Connections Replacing TXV on an Indoor Coil pre-2006Replacing TXV on Indoor Coil post-2006 Personal Injury and Environmental HazardRefrigeration System Repair Leak DetectionCoil Removal Fire HazardCompressor Removal and Replacement System Clean-Up After BurnoutDeep Vacuum Method Check ChargeEvacuation Troubleshooting with Superheat Basic DiagnosticsLow Superheat with Normal or Low Suction Pressure Low Superheat with High Suction PressurePseudo Evaporator Superheat Instructions High Superheat with Normal or High Suction PressureHunting Superheat Puron System Suction Pressure Drop Example22 System Suction Pressure Drop PuronrRefrigerant Pressure Temperature Chart Psig22 Refrigerant Pressure Temperature Relationship PsigPuron Subcooling Chart Liquid Line Temperature F Liq Press Subcooling F PsigPuron Superheat Chart Superheat F Psig22 Subcooling Chart Liquid Line Temperature F PT F Subcooling F Pres Psig22 Superheat Chart TWO-STAGE Application GuidelinesModel Plug Model Plug InformationGeneral Information Low Ambient CoolingDefrost Airflow Selection for 315AAV/355AAV FurnacesLiquid-Line Solenoid Accessory Defrost HoldForced Defrost All 286A units must be charged in high stage onlyOne Minute Stage Change Time Delay on 286ANA/187ANA Models Cooling and Heating OperationUtility Interface With Evolution Control Compressor Operation on 286ANA/187ANA ModelsECM Fan Motor Troubleshooting Outdoor Fan Motor OperationThermistors Time DelaysMuffler, Accumulator, Reversing Valve RVS Control BOX Troubleshooting 230V Line Power Disconnect Detection 230v Brown-Out Protection DefeatedCompressor Voltage Sensing Contactor Shorted DetectionUnloader Test Procedure Temperature ThermistorsFailed Thermistor Default Operation Thermistor Sensor ComparisonTroubleshooting Status CodesEdge Thermidistat Models T6-PRH-01 or T6-NRH-01 TWO-STAGE 286B/289B/180B/187B General Information Heating Check Chart Procedure All 286B units must be charged in high stage onlyCompressor Operation on 289B/180B Models Low Stage High Stage Low & High Model Incoming Power Troubleshooting 187B & 286B Start CircuitControl Box Contactor And CapacitorTroubleshooting HK38EA015 circuit board 286B Models Compressor Thermal Cutout 289B Compressor Thermal CutoutOutdoor Coil Thermistor OCT Attachment Status Codes Single Stage Furnace with 2-Stage Air Conditioner TWO Stage NON-COMMUNICATING 127A/226A Operating AmbientAirflow Selections ECM Furnaces Airflow Selection for FV4C Fan Coils non-communicatingDefrost 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 Evolution Controlled Low Ambient Cooling Defrost HoldMajor Components For Evolution Control only, Green communications Comm Light Communication and Status Function LightsOutdoor Fan Motor Operation 2230V Brown-Out Protection Defeated No 230V at Compressor Contactor Thermistor CurveOutdoor Coil Thermistor OCT Attachment 167A / 266A Troubleshooting Status CodesCare and Maintenance Final Check-Out Puronr R-410A Refrigerant Quick Reference GuideAIR Conditioner Troubleshooting Chart Heat Pump Troubleshooting Heating Cycle Heat Pump Troubleshooting Cooling Cycle Index of Tables Description Table #TWO-STAGE 286A/288A 180A/187A TWO-STAGE 286B/288B 180B/187BCatalog 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.

The Bryant R-22 also incorporates advanced technology to improve user experience. One such innovation is the SmartSet technology, which allows homeowners to program their unit to optimize comfort levels according to their specific needs. This programmable capability enhances energy savings and ensures that the home remains at the desired temperature when residents are present.

Moreover, the unit features a Quiet Operating System that significantly reduces noise levels, making it suitable for residential areas where noise might be a concern. The design minimizes vibrations and optimizes airflow, creating a comfortable environment without disruptive sounds.

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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