Bryant 120 instruction manual Troubleshooting Guide 2-Speed

Page 55

55

START

Is LED status light on?

YES

Is LED status light blinking rapidly without a pause?

NO

Is LED status light blinking ON/OFF slowly with a combination of short and long flashes?

YES

Determine status code. The status code is a 2 digit number with the first digit determined by the number of short flashes and the second digit by the number of long flashes?

Go to section below for the status code that was flashed.

TROUBLESHOOTING GUIDE

NO

 

 

NO

 

Is there 115V at L1 and L2?

 

 

 

Is door switch closed?

 

 

 

 

 

YES

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

NO

 

 

 

 

 

 

 

Is there 24V at SEC-1 and SEC-2?

 

 

 

Is there 115V going to switch?

 

 

YES

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace furnace control.

 

 

 

Replace door switch.

 

 

 

 

 

 

YES

Check for correct line voltage polarity. If

 

 

 

Replace transformer.

 

 

 

 

 

 

 

units are twinned, check for proper low-

 

 

 

 

 

 

 

voltage (24V) transformer phasing.

 

 

 

 

 

 

To recall status code briefly remove and reconnect one RED wire from the

NO draft safeguard switch to display stored status code. On RED LED control do not remove power or blower access panel before initiating status code recall. You can also recall the previous status code by momentarily shorting the TEST/TWIN terminal to Com24V terminal until the LED goes out. LED will flash the status code of the previous fault or status code #11 (1 short and 1 long flash) if there was no previous fault. After the control repeats the code 4 times, the control will start the component test sequence. Once indicated the control will turn ON at HI HEAT speed. The inducer will run for the entire component test. The HSI, blower motor LO HEAT speed, HI HEAT speed, and COOL speed will run for 10 – 15 seconds each. Gas valve and humidifier will not be turned on. When the blower motor is turned OFF the inducer will be switched to low-speed for 10 seconds.

YES

Was there a previous status code other

NO

Does the control respond to W/W1, W2, Y1,

 

than #11?

 

Y/Y2, and G (24V) thermostat signals?

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

NO

Is door switch closed?

NO

 

 

NO

Is circuit breaker closed?

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

Check for continuity in wire from circuit breaker to furnace.

Close circuit breaker and go back to START.

Check room thermostat or interconnecting cable.

 

 

NO

NO

 

 

Is 24V present at W/W1, W2, Y1, Y/Y2 or G

 

 

thermostat terminals on the furnace control?

 

 

 

YES

 

 

 

 

 

Run system through a low-heat, high-heat,

 

Disconnect all the thermostat wires from the

or cooling cycle to check operation. Status

 

furnace control.

codes are erased after 72 hours. On RED

 

 

 

LED boards stored status codes can also be

 

 

 

erased whenever (115V or 24V) is interrupted.

 

 

 

 

YES

 

 

Replace furnace control.

Does the problem repeat when using a

 

 

jumper wire?

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

The thermostat is not compatible with the

 

 

furnace control. Either install a ballast resistor,

 

 

connect the Com24V thermostat terminal to

 

 

the thermostat, or replace the thermostat.

A02107A

Fig. 62 - Troubleshooting Guide 2-Speed

312A

Page 54 Page 56
Image 55
Page 54 Page 56
Contents Ama Furnace Reliability Hazard Safety ConsiderationsCUT Hazard Size DimensionsIntroduction Width Bottom Flue CabinetInstallation Codes and Standards Electrostatic Discharge ESD Precautions ProcedureGeneral LocationCarbon Monoxide Poisoning and Unit Damage Hazard Location Relative to Cooling Equipment FIRE, Injury or Death HazardFire Hazard Property Damage HazardOutdoor Combustion Air Method AIR for Combustion VentilationFurnace Corrosion Hazard Carbon Monoxide Poisoning HazardAir for Combustion, Ventilation and Dilution for Outdoors Upflow Installation InstallationSuspended Furnace Support Downflow InstallationHorizontal Installation FIRE, EXPLOSION, and Carbon Monoxide Poisoning HazardRoll-Out Protection Floor and Plenum Opening DimensionsFurnace Plenum Opening Floor Opening Casing Opening dimensionsWidth Horizontal Unit Suspension Ductwork Acoustical Treatment Supply Air Connections Filter Arrangement Carbon Monoxide Poisoning HazardAIR Ducts General RequirementsSpeed External Static Pressure IN. WC Size Inlet Air Delivery CFM With Filter2380 2285 2200 2085 1970 1835 GAS Piping Fire or Explosion Hazard Air Delivery CFM With Filter*Downflow Furnaces Return Air ConnectionsUpflow Return Air Configurations and Restrictions Furnace Damage Hazard Maximum Capacity of PipeFurnace MAY not Operate Hazard WiringElectrical Connections Electrical Shock and Fire Hazard Electrical Shock HazardBOX Relocation Electrical DataElectrical Connection to J-BOX Fire or Electrical Shock Hazard Power Cord Installation in Furnace J-BOXBX. Cable Installation in Furnace J-BOX Electrical Box on Furnace Casing Side. See FigTwo-Stage Furnace with Two-Speed Air Conditioner See notes 2, 11, and 12 on the page following these figures Venting AccessoriesMasonry Chimney Requirements General Venting RequirementsChimney Inspection Chart Vent Height Internal Area of Chimney Appliance Application RequirementsUpflow Application-Vent Elbow Up Downflow Application-Vent Elbow Up Horizontal Right Application Vent Elbow Right Orientation Tion PUTBTUH/HR Diameter Height FT Furnace Vent OrientaBurn Hazard Rounded End of KnockoutFire and Explosion Hazard START-UP, ADJUSTMENT, and Safety CheckStart-Up Procedures GeneralAltitude Derate Multiplier for U.S.A AdjustmentsStage Furnace Setup Switch Description U.SRedundant Automatic Gas Control Valve Furnace Overheating Hazard Gas Rate cu ft/hrSeconds Size of Test Dial For Revolution Color Speed AS Shipped Speed SelectionStage Furnace Blower OFF delay Setup Switch Check Safety ControlsDesired Heating Mode Setup Switch Blower OFF Delay SEC Checklist Gravity Altitude RangeSpecific Gravity of Natural GAS BTUH/CU6001 to BTUH/CU FT Specific Gravity of Natural GAS Altitude RangeSpecific Gravity of Natural GAS Altitude Range Heat Value Specific Gravity of Natural GAS Heat Value AT Altitude Service and Maintenance ProceduresElectrical SHOCK, Fire or Explosion Hazard FIRE, Personal Injury and Unit DamageUnit Operation Hazard Care and MaintenanceElectrical Controls and Wiring Electrical Shock Hazard IntroductionService Wiring Diagram Furnace Filter Size Casing Cleaning AND/OR Replacing AIR FilterFilter size information Blower Motor and Wheel Electrical Shock HazardUnit Damage Hazard Cleaning Heat ExchangerIgniter Position Top View Sequence of OperationTwo-Stage Heating Adaptive mode with Single-Stage Thermostat Thermidistat Mode Single-Stage Thermostat and Two-Speed Cooling Adaptive ModeSingle-Speed Cooling Troubleshooting Wiring DiagramsContinuous Blower Mode Troubleshooting Guide 2-Speed Blocked vent shutoff switch used in Chimney Adapter Kit Page Catalog No. II312A---45---8

120 specifications

The Bryant 120 is a remarkable system designed for residential and commercial heating and cooling needs, showcasing an impressive blend of efficiency, reliability, and advanced technology. As a part of Bryant's extensive line of HVAC solutions, the Bryant 120 stands out with its features and performance, making it an ideal choice for those seeking comfort year-round.

One of the main features of the Bryant 120 is its exceptional energy efficiency. It boasts a high Seasonal Energy Efficiency Ratio (SEER) rating, enabling homeowners to save on energy costs while enjoying consistent temperature control. This efficiency is aided by its variable-speed compressor, which allows the system to adjust its output based on current requirements, optimizing both energy consumption and comfort.

In terms of technology, the Bryant 120 incorporates advanced controls that enhance user experience and system performance. The system comes equipped with smart thermostats that allow homeowners to monitor and adjust their environment remotely. These thermostats not only provide convenience but also help in optimizing energy usage by learning the household's heating and cooling patterns.

Another characteristic of the Bryant 120 is its durable construction. The unit is built to withstand various weather conditions, featuring a robust cabinet and components designed for longevity. This durability ensures that homeowners can rely on the system for years without the need for frequent repairs or replacements.

Noise levels are also a critical consideration in HVAC systems, and the Bryant 120 addresses this with its quiet operation. The system is designed to minimize sound output, making it suitable for residential areas where noise can be a concern. This is particularly beneficial for nighttime use, providing a comfortable sleeping environment.

Additionally, the Bryant 120 supports eco-friendly refrigerants that comply with environmental standards, contributing to a reduction in greenhouse gas emissions. This commitment to sustainability reflects Bryant's dedication to creating products that are not only effective but also responsible.

Overall, the Bryant 120 encapsulates a harmonious balance of efficiency, advanced technology, durability, and quiet operation. Whether for a new installation or a replacement, the Bryant 120 presents an ideal solution to meet diverse heating and cooling requirements, enhancing comfort while prioritizing energy savings and environmental responsibility.
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