Bryant 120 instruction manual START-UP, ADJUSTMENT, and Safety Check, General, Start-Up Procedures

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In Canada: Per section 8.24.2 of the CAN/CSA-B149.1-05, any listed mechanical venter may be used, when approved by the authority having jurisdiction.

Select the listed mechanical venter to match the Btuh input of the furnace being vented. Follow all manufacturer￿s installation requirements for venting and termination included with the listed mechanical venter.

START-UP, ADJUSTMENT, AND SAFETY

CHECK

Step 1 — General

!WARNING

FIRE HAZARD

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

This furnace is equipped with manual reset limit switches in the gas control area. The switches open and shut off power to the gas valve if a flame roll-out or overheating condition occurs in the gas control area. DO NOT bypass the switches. Correct problem before resetting the switches.

1.Maintain 115-v wiring and ground. Improper polarity will result in rapid flashing LED and no furnace operation.

2.Make thermostat wire connections at the 24-v terminal block on the furnace control. Failure to make proper connections will result in improper operation. (See Fig. 24.)

3.Gas supply pressure to the furnace must be greater than 4.5-in. wc (0.16 psig ) but not exceed 14-in. wc (0.5 psig).

!CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing furnaces.

4.Check all manual-reset switches for continuity.

5.Install blower compartment door. Door must be in place to operate furnace.

6.Setup switch descriptions The 2 stage furnace has DIP switches used to select thermostat staging and blower off delay timings. For switch locations on Furnace control board, See Fig. 34 and 58.

7.Setup switch descriptions - See Table 10.

Step 2 — Start-Up Procedures

!WARNING

FIRE AND EXPLOSION HAZARD

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

Never purge a gas line into a combustion chamber. Never use matches, candles, flame, or other sources of ignition for the purpose of checking leakage. Use a soap-and-water solution to check for leakage.

1.Purge gas lines after all connections have been made.

2.Check gas lines for leaks.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury, or death. Blower access door switch opens 115-v power to control. No component operation can occur unless switch is closed. Caution must be taken when manually closing this switch for service purposes.

3.To Begin Component Self-Test:

Remove blower access door. Disconnect the thermostat R lead from furnace control board. Manually close blower door switch. Short (jumper) the COM-24v terminal on control to the TEST/TWIN 3/16-inch quick-connect terminal on control until the LED goes out (approximately 2 sec). Gas valve and humidifier will not be turned on. Remove jumper from terminals. (See Fig. 34 and Table 10.)

NOTE: The furnace control allows all components, except the gas valve, to be run for short period of time. This feature helps diagnose a system problem in case of a component failure. Component test feature will not operate if any thermostat signal is present at the control.

Refer to service label attached to furnace or See Fig. 57. Component test sequence is as follows:

a.LED will display previous status code 4 times.

b.Inducer motor starts on high-speed and continues to run until Step g of component test sequence.

c.Hot surface igniter is energized for 15 sec., then off.

d.Blower motor operates on LO-HEAT speed for 10 sec.

e.Blower motor operates on HI-HEAT speed for 10 sec.

f.Blower motor operates on COOL speed for 10 sec.

g.Inducer motor goes to low-speed for 10 sec., then stops.

h.Reconnect R lead to furnace control board, remove tape from blower door switch and re-install blower door.

4.Operate furnace per instruction on inner door.

5.Verify furnace shut down by lowering thermostat setting below room temperature.

6.Verify furnace restarts by raising thermostat setting above room temperature.

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Contents Ama CUT Hazard Safety ConsiderationsFurnace Reliability Hazard Size DimensionsIntroduction Width Bottom Flue CabinetInstallation Codes and Standards Electrostatic Discharge ESD Precautions ProcedureCarbon Monoxide Poisoning and Unit Damage Hazard LocationGeneral 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 DimensionsWidth Opening dimensionsFurnace Plenum Opening Floor Opening Casing 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 HazardElectrical Connection to J-BOX Electrical DataBOX Relocation 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 Seconds Size of Test Dial For Revolution Gas Rate cu ft/hrFurnace Overheating Hazard Color Speed AS Shipped Speed SelectionDesired Heating Mode Setup Switch Blower OFF Delay SEC Check Safety ControlsStage Furnace Blower OFF delay Setup Switch Checklist Gravity Altitude RangeSpecific Gravity of Natural GAS BTUH/CU6001 to Specific Gravity of Natural GAS Altitude Range Heat Value Specific Gravity of Natural GAS Altitude RangeBTUH/CU FT 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 Single-Speed Cooling Single-Stage Thermostat and Two-Speed Cooling Adaptive ModeThermidistat Mode Continuous Blower Mode Wiring DiagramsTroubleshooting 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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