Bryant 120 instruction manual Introduction, Care and Maintenance, Unit Operation Hazard

Page 46

312A

!CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in improper unit operation or failure of unit components.

Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.

Step 1 — Introduction

GENERAL

These instructions are written as if the furnace is installed in an upflow application. An upflow furnace application is where the blower is located below the combustion and controls section of the furnace, and conditioned air is discharged upward. Since this furnace can be installed in any of the 4 positions shown in Fig. 4, you must revise your orientation to component location accordingly.

ELECTRICAL CONTROLS AND WIRING

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

There may be more than one electrical supply to the furnace. Check accessories and cooling unit for additional electrical supplies that must be shut off during furnace servicing.

The electrical ground and polarity for 115-v wiring must be properly maintained. Refer to Fig. 24 for field wiring information and to Fig. 58 for furnace wiring information.

NOTE: If the polarity is not correct, the STATUS LED on the control will flash rapidly and prevent the furnace from heating. The control system also requires an earth ground for proper operation of the control and flame-sensing electrode.

The 24-v circuit contains an automotive-type, 3-amp. fuse located on the control. (See Fig. 32.) Any shorts of the 24-v wiring during installation, service, or maintenance will cause this fuse to blow. If fuse replacement is required, use ONLY a 3-amp. fuse. The control LED will display status code 24 when fuse needs to be replaced.

Proper instrumentation is required to service electrical controls. The control in this furnace is equipped with a Status Code LED (Light-Emitting Diode) to aid in installation, servicing, and troubleshooting. It can be viewed through the sight glass in blower access door. The furnace control LED is either ON continuously, rapid flashing, or a code composed of 2 digits. The first digit is the number of short flashes, the second digit is the number of long flashes.

For an explanation of status codes, refer to service label located on blower access door or Fig. 57, and the troubleshooting guide which can be obtained from your distributor.

See Fig. 62 for a brief Troubleshooting guide.

For Controls with an Amber LED

The stored status codes will NOT be erased from the control memory, if 115- or 24-v power is interrupted. The control will store up to five (5) status codes.

1.To retrieve status codes, proceed with the following: NOTE: NO thermostat signal may be present at control, and all blower-OFF delays must be completed.

a.Leave 115-v power to furnace turned on.

b.Remove outer access door.

c.Look into blower access door sight glass for current LED status. Removing blower access door will open blower access door switch and terminate 115-v power to control so that status code is not displayed.

d.BRIEFLY remove insulated terminal wire from the draft safeguard (DSS) switch until LED goes out, then reconnect it.

NOTE: If wire to DSS is disconnected longer than 4 sec, main blower starts, and retrieval request is ignored.

2.When above items have been completed, the LED flashes status code 4 times. Record this status code for further troubleshooting. After the LED flashes status code four times, BRIEFLY remove wire again from DSS switch until LED goes out, then reconnect it to retrieve previous status code (if available). Repeat as needed for more previous status codes or until Code 11 appears.

Step 2 — Care and Maintenance

!WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death and/or property damage.

Never store anything on, near, or in contact with the furnace, such as:

1.Spray or aerosol cans, rags, brooms, dust mops, vacuum cleaners, or other cleaning tools.

2.Soap powders, bleaches, waxes or other cleaning compounds, plastic or plastic containers, gasoline, kerosene, cigarette lighter fluid, dry cleaning fluids, or other volatile fluids.

3.Paint thinners and other painting compounds, paper bags, or other paper products. Explosure to these materials could lead to corrosion of the heat exchanger.

For continuing high performance and to minimize possible furnace failure, periodic maintenance must be performed on this furnace. Consult your local dealer about proper frequency of maintenance and the availability of a maintenance contract.

!WARNING

ELECTRICAL SHOCK AND FIRE HAZARD

Failure to follow this warning could result in personal injury, death or property damage.

Turn off the gas and electrical supplies to the unit before performing any maintenance or service. Follow the operating instructions on the label attached to the furnace.

!WARNING

CARBON MONOXIDE POISONING AND FIRE HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Never operate unit without a filter or with filter access door removed.

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Contents Ama Furnace Reliability Hazard Safety ConsiderationsCUT Hazard Width Bottom Flue Cabinet DimensionsIntroduction SizeInstallation Electrostatic Discharge ESD Precautions Procedure Codes and StandardsGeneral LocationCarbon Monoxide Poisoning and Unit Damage Hazard Property Damage Hazard FIRE, Injury or Death HazardFire Hazard Location Relative to Cooling EquipmentCarbon Monoxide Poisoning Hazard AIR for Combustion VentilationFurnace Corrosion Hazard Outdoor Combustion Air MethodAir for Combustion, Ventilation and Dilution for Outdoors Installation Upflow InstallationFIRE, EXPLOSION, and Carbon Monoxide Poisoning Hazard Downflow InstallationHorizontal Installation Suspended Furnace SupportFloor and Plenum Opening Dimensions Roll-Out ProtectionFurnace Plenum Opening Floor Opening Casing Opening dimensionsWidth Horizontal Unit Suspension General Requirements Filter Arrangement Carbon Monoxide Poisoning HazardAIR Ducts Ductwork Acoustical Treatment Supply Air ConnectionsAir Delivery CFM With Filter Speed External Static Pressure IN. WC Size Inlet2380 2285 2200 2085 1970 1835 Return Air Connections Air Delivery CFM With Filter*Downflow Furnaces GAS Piping Fire or Explosion HazardUpflow Return Air Configurations and Restrictions Maximum Capacity of Pipe Furnace Damage HazardElectrical Shock Hazard WiringElectrical Connections Electrical Shock and Fire Hazard Furnace MAY not Operate HazardBOX Relocation Electrical DataElectrical Connection to J-BOX Electrical Box on Furnace Casing Side. See Fig Power Cord Installation in Furnace J-BOXBX. Cable Installation in Furnace J-BOX Fire or Electrical Shock HazardTwo-Stage Furnace with Two-Speed Air Conditioner See notes 2, 11, and 12 on the page following these figures Accessories VentingGeneral Venting Requirements Masonry Chimney RequirementsChimney Inspection Chart Appliance Application Requirements Vent Height Internal Area of ChimneyUpflow Application-Vent Elbow Up Downflow Application-Vent Elbow Up Horizontal Right Application Vent Elbow Right Furnace Vent Orienta Orientation Tion PUTBTUH/HR Diameter Height FTRounded End of Knockout Burn HazardGeneral START-UP, ADJUSTMENT, and Safety CheckStart-Up Procedures Fire and Explosion HazardU.S AdjustmentsStage Furnace Setup Switch Description Altitude Derate Multiplier for U.S.ARedundant Automatic Gas Control Valve Furnace Overheating Hazard Gas Rate cu ft/hrSeconds Size of Test Dial For Revolution Speed Selection Color Speed AS ShippedStage Furnace Blower OFF delay Setup Switch Check Safety ControlsDesired Heating Mode Setup Switch Blower OFF Delay SEC Checklist BTUH/CU Altitude RangeSpecific Gravity of Natural GAS Gravity6001 to BTUH/CU FT Specific Gravity of Natural GAS Altitude RangeSpecific Gravity of Natural GAS Altitude Range Heat Value FIRE, Personal Injury and Unit Damage Service and Maintenance ProceduresElectrical SHOCK, Fire or Explosion Hazard Specific Gravity of Natural GAS Heat Value AT AltitudeIntroduction Care and MaintenanceElectrical Controls and Wiring Electrical Shock Hazard Unit Operation HazardService Wiring Diagram Blower Motor and Wheel Electrical Shock Hazard Cleaning AND/OR Replacing AIR FilterFilter size information Furnace Filter Size CasingCleaning Heat Exchanger Unit Damage HazardSequence of Operation Igniter Position Top ViewTwo-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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