Bryant R-22 service manual Low Stage High Stage Low & High Model

Page 60

The outdoor Integral Control Motor (ECM), is a variable-speed motor which operates from 450 to 850 rpm. The motor is a dc permanent magnet-type motor with the electronic controls integrated into its rear cover. The control package includes a small diode bridge, capacitors, and power switching devices. It converts ac to dc power and switches the dc power to the motor windings on and off at various rates to control the motor speed. The speed at which the motor windings are thus commutated is determined by a pulse width modulated (PWM) signal which is received from the control board on the motor control lines.

The PWM signal is created by turning a DC signal on and off once within a given period of time. The signal on time relative to the signal total period defines the percent of the PWM. For example, if the period is 5 sec and the control power is turned on for 1 sec then off, the signal will remain off for 4 sec before turning on again to start the next cycle. The PWM is called a 20 percent duty cycle signal. If the on time is increased to 4 sec of the 5 sec period, the PWM is called an 80 percent duty cycle. The ECM reads the PWM signal and increases the motor speed linearly from minimum speed to maximum speed with the percent duty cycle value of the supplied PWM signal.

Outdoor Fan Motor Operation

There are two different types of motors used in the Evolution 2-stage outdoor units. The 286B models use a PSC type fan motor, and the speed does not change between high and low speed operation.

On 289B models, an ECM fan motor is used to achieve higher efficiency ratings of the system. The outdoor unit control energizes outdoor fan anytime compressor is operating, except for defrost or low-ambient cooling. The outdoor fan remains energized if a pressure switch or compressor overload should open. The outdoor fan motor will continue to operate for one minute after the compressor shuts off when the outdoor ambient is greater than or equal to 100°F/37.7°C. This reduces pressure differential for easier starting on next cycle. On 286B/187B models, the outdoor fan remains energized during the 1-minute compressor staging time delay.

On 286B/187B models, the outdoor fan motor is a PSC type. A fan relay on the control board turns the fan off and on by opening and closing a high voltage circuit to the motor. It does not change speeds between low and high stage operation.

On 289B/180B models, the outdoor fan is an ECM type. The motor control is continuously powered with high voltage. The motor speed is determined by electrical pulses provided by the PWM outputs on the control board. The ECM motor RPM adjusts to outdoor conditions as described in Table 19. The PWM output can be measured with a volt meter set to DC volts.

In low ambient cooling (below 55°F/12.7°C), the control board cycles the fan off and on.

Table 19—Outdoor Fan Motor PWM

Outdoor Temp (DC volts, Tolerance +/- 2%)

 

 

Low Stage

 

High Stage

Low & High

Model

 

 

 

Stage

(OAT≤104_F / 40_C)

 

(OAT≤104_F / 40_C)

 

 

 

(OAT>104_F / 40_C)

 

 

 

 

 

 

 

 

 

 

 

 

289BNA036

 

9.06

 

10.23

 

11.90

 

 

 

 

 

 

 

289BNA048

 

9.91

 

11.04

 

11.90

 

 

 

 

 

 

 

289BNA060

 

10.83

 

11.70

 

11.90

 

 

 

 

 

 

 

 

 

 

 

 

 

 

180BNA024

 

9.57

 

10.88

 

11.90

180BNA036

 

9.06

 

10.23

 

11.90

180BNA048

 

9.91

 

11.04

 

11.90

180BNA060

 

10.83

 

11.70

 

11.90

NOTE: For 289B models in low---

ambient cooling, the PWM output for

both high

--- and low---stage equals the value for low

---stage

operation below 55_F (12.8_C).

ECM Fan Motor Troubleshooting

If the outdoor fan motor fails to start and run:

SCheck the high-voltage supply. The unit need not be running to check high voltage, but the power must be on.

SIf the 230vac is present, use Table 19 to check for proper control voltage output to the fan motor from the control board. The control board sends DC voltage signals to the motor through the terminals labeled PWM1 and PWM2 Set a voltmeter on a DC voltage scale and check across these terminals.

SFirst check voltage with the motor disconnected. If no control voltage is present, check control-board connections. If connections are good, replace the control board.

SIf voltage is present, reconnect the motor and check again. Shut down the unit to reconnect the motor and restart the unit to complete this troubleshooting procedure. If control voltage is no longer present or motor fails to respond, check motor connections.

SIf connections are good, replace the motor.

Time Delays

The unit time delays include:

SFive minute time delay to start cooling or heating operation when there is a call from the thermostat or user interface. To bypass this feature, momentarily short and release Forced Defrost pins.

SFive minute compressor re-cycle delay on return from a brown-out condition.

STwo minute time delay to return to standby operation from last valid communication (with Evolution only).

SOne minute time delay of outdoor fan at termination of cooling mode when outdoor ambient is greater than or equal to 100_F.

SFifteen second delay at termination of defrost before the auxiliary heat (W1) is de-energized.

STwenty second delay at termination of defrost before the outdoor fan is energized.

SThirty second compressor delay when quiet shift enabled.

SOn 226A, 266A, 286B models there is a 1 minute time delay between staging from low to high and from high to low capacity. On 289B models there is no delay; the compressor will change from low to high and from high to low capacity “on the fly” to meet the demand.

Pressure Switches

The Puronr two-stage air conditioner contains two pressure switches to prevent system operation if the pressures get excessively high or low. The air conditioner low pressure switch in the suction line opens at 50 PSI and closes at 95 PSI. The high pressure switch opens at 670 PSI and closes at 470 PSI. Both pressure switch settings are considerably higher than on comparably sized R-22 units. The high and low pressure switches can be identified by their pink stripe on the switch’s electrical wires.

The Puronr two-stage heat pump contains a loss of charge switch in the suction line on 286B and 289B, and liquid line on 226A and 266A which opens at 23 PSI and closes at 55 PSI. See troubleshooting section for sequence when a pressure switch trip occurs.

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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 NomenclatureSafety Considerations Installation GuidelineIntroduction Accessories Required Field-Installed Accessories for Air ConditionersRequired Field-Installed Accessories for Heat Pumps Accessory Descriptions Base / Mid-Tier / Deluxe 4-sided Baffle Assembly LOW-AMBIENT Cooling GuidelineDeluxe 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 Labeling Figure LabelsAluminum Wire ElectricalContactor CapacitorTime-Delay Relay Crankcase HeaterCycle Protector 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 KA75UG100Single-Phase Motors Electrical FailuresUnit Personal Injury Hazard Refrigeration System RefrigerantCompressor Oil Synthetic Roof Precautionary Procedure Servicing Systems on Roofs With Synthetic MaterialsBrazing Oil ChargingService Valves and Pumpdown Pumpdown ProcedurePersonal Injury and Unit Damage Hazard Heating Piston AccuRaterr Heat Pumps Only AccuRaterr Components Used in R-22 Heat PumpsReversing Valve Reversing Valve Heating Mode, Solenoid De-EnergizedInstall Liquid-line Filter Drier Indoor AC Liquid Line Filter DrierSuction 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 BurnoutCheck Charge EvacuationDeep Vacuum Method Troubleshooting with Superheat Basic DiagnosticsLow Superheat with Normal or Low Suction Pressure Low Superheat with High Suction PressureHigh Superheat with Normal or High Suction Pressure Hunting SuperheatPseudo Evaporator Superheat Instructions 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 OperationTime Delays Muffler, Accumulator, Reversing Valve RVSThermistors 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-communicatingSystem 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 Evolution Controlled Low Ambient Cooling Defrost HoldMajor Components Communication and Status Function Lights Outdoor Fan Motor OperationFor Evolution Control only, Green communications Comm Light 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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