Bryant 580G manual Head Pressure Control, Motormaster III Control, III. Field Test Operation

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I. Head Pressure Control

Each unit has a fan cycling, outdoor thermostat to shut off the outdoor-fan motor(s) at 55 F. The head pressure control permits unit to operate with correct condensing tempera- tures down to 35 F outdoor-air temperature.

J. Motormaster III Control

The Motormaster III Solid-State Head Pressure Control is a ®eld-installed accessory fan speed control device actuated by a temperature sensor. It is speci®cally designed for use on Bryant equipment and controls the condenser-fan motor speed in response to the saturated condensing temperature. For out- door temperatures down to −20 F, it maintains condensing temperature at 100 F. Refer to the accessory Motormaster installation instructions for more information.

III. FIELD TEST OPERATION

The ®eld test program is initiated by moving up DIP switch no. 4 to the ``On'' position. The outdoor-air damper will close. The control allows 90 seconds for the damper to close in case it was in the full open position. Next, the indoor-fan con- tactor will be energized, and the outside-air damper will begin to open to its default value of 20% and stay at that po- sition for a short period of time. The outdoor-air damper will then open to its full open position and stay at that position for a short period of time. The outdoor-air damper will then close.

If the unit is equipped with power exhaust, stage 1 will be energized for 5 seconds. If the unit is con®gured for stage 2 of power exhaust, stage 2 will be energized for 5 seconds after the ®rst stage is deenergized.

The ®rst stage of heat will be energized for 30 seconds, after which the second stage heat will be energized for an addi- tional 30 seconds. Heat is then deenergized.

The last step is the Cooling mode. Outdoor-fan contactor no. 1 is energized. This is followed by each stage of cooling energized with a 10-second delay between stages. After this is complete, outdoor-fan contactor no. 2 is energized for 10 seconds.

The compressors will now deenergize, followed by the outdoor- fan contactors and indoor-fan contactors. If the unit is equipped with the Integrated Gas Control (IGC) board the indoor fan will operate for an additional 30 seconds after deenergizing the circuit.

Setting of the outdoor-air damper position is performed in con- junction with a shortened version of the ®eld test. Open DIP switch no. 4 and then no. 6.

The outdoor-air damper will close. The control allows 90 seconds for the damper to close in case it is in the full open position. Next, the indoor-fan contactor will energize. The outdoor-air damper will remain at 0% for 30 seconds. It will then move to the 10% position for another 30 seconds. This will be repeated at every 10% increment for 30 seconds until the damper reaches 100% open. Close DIP switch no. 4 during the 30 seconds immediately after the desired outdoor- air minimum damper position. The 30-second time period is to allow time where DIP switch no. 4 can be closed. The de- fault value of the minimum outdoor-air damper position is 20%. If the desired minimum position is 30%, allow the damper position to go to 10% for 30 seconds, then 20% for 30 seconds, and when it reaches 30% close DIP switch no. 4 during the 30-second period following the 30% position.

The minimum outdoor-air damper position is now set. Close DIP switch no. 6.

IV. INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS

CAUTION: For cooling operation, the recommended air¯ow is 300 to 450 cfm per each 12,000 Btuh of rated cooling capacity. For heating operation, the air¯ow must produce a temperature rise that falls within the range stamped on the unit rating plate.

A. Evaporator Fan Performance Adjustment

Be sure evaporator fans rotate in the proper direction. See Tables 8 and 9 for Fan Performance data. See Table 10 for Motor Limitation data. See Table 11 for air quantity limits.

IMPORTANT: Check to ensure that the unit drive matches the duct static pressure using Table 8.

Fan motor pulleys are factory set for speed shown in Table 1. To change fan speeds, change pulleys.

To align fan and motor pulleys (Fig. 34):

1.Shut off unit power supply.

2.Loosen fan shaft pulley bushing.

3.Slide fan pulley along fan shaft.

4.Make angular alignment by loosening motor from mount- ing plate.

5.Retighten pulley.

Fig. 34 Ð Evaporator-Fan Pulley Alignment and

Adjustment

B. Belt Tension Adjustment

To adjust belt tension:

1.Remove power to unit.

2.Remove motor mount nuts and bolts.

3.Loosen fan motor nuts. See Fig. 35.

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Contents Contents Safety ConsiderationsInstallation Provide Unit Support Roof CurbAlternate Unit Support II. RIG and Place UnitBase Unit Dimensions, 580G240-360 Unit Size Operating Corner WeightBase Unit Dimensions, 580H240-360 Must be in Place When Rigging Unit WeightSpecications Unit 580G,HIII. Field Fabricate Ductwork IV. Unit Duct ConnectionsFlue Hood VI. Trap Condensate DrainVII. GAS Piping Power Wiring Field Power SupplyVIII. Electrical Connections Controls OptionsSIO LEDField Control Wiring Electrical Data Ð 580G,H240-360 Ð13Ð IX. OUTDOOR-AIR Inlet Assembly EconomizerAdding Seal Strip to Mounting Flange Hood Sides Economizer Settings Mounting Angle With Tabs Attached to Filter Track AssemblyEnthalpy Control and Sensor Power EXHAUST/BAROMETRIC Relief Damper Hood Economizer DetailsXI. Accessories Motormaster III Control InstallationLow Ambient Kit Sensor Location PRE-START-UPDIP Switch Conguration DIP Switch Factory SettingsSTART-UP Cooling Section START-UP and Adjustments Checking Cooling Control OperationII. Heating Section START-UP and Adjustments Smoke Control Modes Smoke DetectorIndoor Air Quality Control Time Guard CircuitIV. Indoor Airflow and Airflow Adjustments Evaporator Fan Performance AdjustmentHead Pressure Control Motormaster III ControlCondenser-Fan Adjustment GAS Valve AdjustmentNatural Gas Fan Performance, 580G240-360 Ð Vertical Discharge Units AirflowAvailable External Static Pressure Airflow Fan Performance Ð Power Exhaust Motor LimitationsAir Quantity Limits VII. Power Exhaust Operation Care and MaintenanceVI. Main Burners VIII. Head Pressure ControlService CleaningII. Lubrication Spark Gap Adjustment III. Evaporator FAN Service and Replacement IV. EVAPORATOR-FAN Motor ReplacementPower Failure VI. Refrigerant ChargeXIII. Replacement Parts VII. Filter DrierVIII. Thermostatic Expansion Valve TXV IX. Protective DevicesTroubleshooting Control Board LED Alarms II. Error Code SummaryIGC Board Error Code Summary LED Error Description Troubleshooting Blinks Code CommentsI/O Channel Designations Base Module Terminal AssignmentSAT IGC Control Heating and Cooling AHA IDMIFC IfcbTable a Table BPower Schematic 580G,H240-360 Ð 24 V Control Schematic 580G,H240-360 Component Arrangement 580G,H240-360 Packaged Service Training START-UP Checklist TemperaturesSTART-UP Electrical PressuresGeneral

580G specifications

The Bryant 580G is a high-efficiency gas furnace designed to deliver optimal heating performance while maximizing energy savings. This model stands out in the Bryant product lineup due to its advanced features and robust technology, making it a popular choice for homeowners seeking reliable comfort in colder climates.

One of the key characteristics of the Bryant 580G is its efficiency rating. With an annual fuel utilization efficiency (AFUE) of up to 92.1%, this furnace ensures that a substantial portion of the fuel consumed is converted into heat, minimizing energy waste and reducing utility bills. This high-efficiency performance is particularly beneficial for those looking to lower their environmental footprint and operate a more sustainable home heating system.

The 580G uses a two-stage heating process, which allows it to operate at two levels of output. During mild weather, the furnace can run on a lower setting, providing gentle warmth while conserving energy. When temperatures drop, the system automatically ramps up to a higher output to maintain comfort. This feature not only enhances energy efficiency but also helps to eliminate temperature fluctuations, ensuring consistent warmth throughout the home.

Noise reduction technology is another remarkable aspect of the Bryant 580G. Equipped with a variable speed blower motor, this furnace operates quietly, providing a more peaceful indoor environment. The motor allows for customizable airflow, which further aids in maintaining an even temperature across different rooms and spaces.

The furnace is built with high-quality materials and features a compact design, making it a suitable option for various installation locations. Additionally, it is compatible with Bryant’s EcoNet Smart Home Management System, which enables homeowners to monitor and control their heating system remotely via a smartphone app. This integration enhances convenience and allows for timely adjustments to heating schedules, promoting energy savings.

Safety is a priority with the 580G. It features an integrated safety switch and a reliable flame sensor to ensure safe operation. With its durable construction and thoughtful engineering, the Bryant 580G is designed to withstand the demands of everyday use while providing peace of mind to homeowners.

In summary, the Bryant 580G gas furnace combines high efficiency, advanced technology, and user-friendly features. Its ability to operate quietly, adapt to temperature changes, and integrate with smart home technology makes it a leading choice for efficient home heating solutions. This furnace not only provides comfort but also offers long-term energy savings, making it a smart investment for any household.
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