Bryant Official Manual for Heating Systems

Page 34

XIII. OPERATING SEQUENCE

A. Cooling, Units Without Economizer

When thermostat calls for cooling, terminals G and Y1 are energized. The indoor (evaporator) fan contactor (IFC), com- pressor contactor no. 1 (C1) and outdoor-fan contactor (OFC) are energized, and evaporator-fan motor, compressor no. 1, and both condenser fans start. The condenser-fan motors run continuously while unit is cooling. If the thermostat calls for a second stage of cooling by energizing Y2, compressor con- tactor no. 2 (C2) is energized and compressor no. 2 starts.

When the thermostat is satisfied, C1 and C2 are deener- gized and the compressors and outdoor (condenser) fan motors (OFM) shut off. After a 30-second delay, the indoor (evaporator) fan motor (IFM) shuts off. If the thermostat fan selector switch is in the ON position, the evaporator-fan motor will run continuously.

B. Heating, Units Without Economizer

When the thermostat calls for heating, terminal W1 is ener- gized. In order to prevent thermostat short-cycling, the unit is locked into the Heating mode for at least 1 minute when W1 is energized. The induced-draft motor (IDM) is then energized and the burner ignition sequence begins. The indoor (evaporator) fan motor (IFM) is energized 45 seconds after a flame is ignited. On units equipped for two stages of heat, when additional heat is needed, W2 is energized and the high-fire solenoid on the main gas valve (MGV) is ener- gized. When the thermostat is satisfied and W1 and W2 are deenergized, the IFM stops after a 45-second time-off delay.

C. Cooling, Units with EconoMi$erIV

When free cooling is not available, the compressors will be controlled by the zone thermostat. When free cooling is avail- able, the outdoor-air damper is modulated by the EconoMi$erIV control to provide a 50 to 55 F supply-air tem- perature into the zone. As the supply-air temperature fluctu- ates above 55 or below 50 F, the dampers will be modulated (open or close) to bring the supply-air temperature back within the set point limits.

For EconoMi$erIV operation, there must be a thermostat call for the fan (G). This will move the damper to its mini- mum position during the occupied mode.

Above 50 F supply-air temperature, the dampers will modu- late from 100% open to the minimum open position. From 50 F to 45 F supply-air temperature, the dampers will main- tain at the minimum open position. Below 45 F the dampers will be completely shut. As the supply-air temperature rises, the dampers will come back open to the minimum open posi- tion once the supply-air temperature rises to 48 F.

If optional power exhaust is installed, as the outdoor-air damper opens and closes, the power exhaust fan will be ener- gized and deenergized.

If field-installed accessory CO2 sensors are connected to the EconoMi$erIV control, a demand controlled ventilation strategy will begin to operate. As the CO2 level in the zone increases above the CO2 set point, the minimum position of the damper will be increased proportionally. As the CO2 level decreases because of the increase in fresh air, the outdoor-air damper will be proportionally closed. Damper position will follow the higher demand condition from DCV mode or free cooling mode.

Damper movement from full closed to full open (or vice versa) will take between 11/2 and 21/2 minutes.

If free cooling can be used as determined from the appropri- ate changeover command (switch, dry bulb, enthalpy curve, differential dry bulb, or differential enthalpy), a call for cool- ing (Y1 closes at the thermostat) will cause the control to modulate the dampers open to maintain the supply air tem- perature set point at 50 to 55 F.

As the supply-air temperature drops below the set point range of 50 to 55 F, the control will modulate the outdoor-air damp- ers closed to maintain the proper supply-air temperature.

D. Heating, Units With EconoMi$erIV

When the room thermostat calls for heat, the heating con- trols are energized as described in the Heating, Units With- out Economizer section. When the indoor fan is running, the economizer damper moves to the minimum position. When the indoor fan is off, the economizer damper is fully closed.

SERVICE

WARNING: Before performing service or mainte- nance operations on unit, turn off main power switch to unit and install lockout tag on disconnect switch. Electrical shock could cause personal injury.

I. CLEANING

Inspect unit interior at beginning of each heating and cool- ing season and as operating conditions require. Remove unit top panel and/or side panels for access to unit interior.

A. Main Burner

At the beginning of each heating season, inspect for deterio- ration or blockage due to corrosion or other causes. Observe the main burner flames. Refer to Main Burners section on page 37.

B. Flue Gas Passageways

The flue collector box and heat exchanger cells may be inspected by removing heat exchanger access panel (Fig. 4- 6), flue box cover, and main burner assembly (Fig. 10 and 11). Refer to Main Burners section on page 37 for burner removal sequence. If cleaning is required, remove heat exchanger baffles and clean tubes with a wire brush.

Use caution with ceramic heat exchanger baffles. When installing retaining clip, be sure the center leg of the clip extends inward toward baffle. See Fig. 37.

C. Combustion-Air Blower

Clean periodically to assure proper airflow and heating effi- ciency. Inspect blower wheel every fall and periodically during heating season. For the first heating season, inspect blower wheel bi-monthly to determine proper clean- ing frequency.

To inspect blower wheel, remove heat exchanger access panel. Shine a flashlight into opening to inspect wheel. If cleaning is required, remove motor and wheel assembly by removing screws holding motor mounting plate to top of combustion fan housing. The motor and wheel assembly will slide up and out of the fan housing. Remove the blower wheel from the motor shaft and clean with a detergent or solvent. Replace motor and wheel assembly.

D. Evaporator Coil

Clean as required with commercial coil cleaner.

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Contents Safety Considerations ContentsInstallation Provide Unit Support Roof Curb Details 580F180-240 Roof Curb Details 580F300 Positioning Alternate Unit SupportII. RIG and Place Unit Roof Mount210 Unit Maximum Dimensions Shipping Weight580F Ft-in 180 240Base Unit Dimensions 580F180 Base Unit Dimensions 580F240 Base Unit Dimensions 580F300 Physical Data Freeze Protection Thermostat F Power ExhaustFurnace Section OUTDOOR-AIR Inlet ScreensIV. Make Unit Duct Connections Install Flue Hood and Wind BaffleIII. Field Fabricate Ductwork VI. Trap Condensate DrainVII. Orifice Change Field Control Wiring VIII. Install GAS PipingOptional Non-Fused Disconnect Field Power Wiring Connections Optional Convenience OutletElectrical Data Make OUTDOOR-AIR Inlet Adjust MentsXI. Install OUTDOOR-AIR Hood Manual Outdoor-Air DamperXII. Install ALL Accessories Outdoor-Air Hood Component LocationMotormaster V Control Package Usage Motormaster V Control Installation 580F240Applicable Voltages and Motors EconoMi$erIV Standard Sensors Outdoor Air Damper LeakageReturn Air Pressure Drop in. wg CFMTemperature F EconoMi$erIV Control ModesEconoMi$erIV Sensor Usage EconoMi$erIV Controller Potentiometer LED LocationsEnthalpy Changeover Set Points EconoMi$erIV Controller CO2 Sensor Standard Settings LPS LlsvTran Page START-UP IV. Refrigerant Service PortsVI. Internal Wiring Unit PreparationFan Performance 580F180275 Low Heat Units AirflowFan Performance 580F180360 High Heat Units 7200 7500Fan Performance 580F210360 High Heat Units Fan Performance 580F210275 Low Heat UnitsRpm Bhp Watts 500 Rpm Watts Bhp 000 Fan Performance 580F240275 Low Heat Units500 000 10,000 Fan Performance 580F240360 High Heat Units 000 500 10,000Fan Performance 580F300360 High Heat Units Fan Performance 580F300275 Low Heat UnitsGeneral Notes for FAN Performance Data Tables Air Quantity Limits Accessory/FIOP Static Pressure in. wg 580F180-300Fan Rpm at Motor Pulley Settings Evaporator-Fan Motor DataService Cleaning XIII. Operating SequenceIV. Evaporator FAN Service and Replacement II. LubricationVII. Power Failure Belt Tension AdjustmentVI. CONDENSER-FAN Adjustment VIII. Refrigerant ChargeNatural Gas IX. GAS Valve AdjustmentPerfect Humidity System Charging Main BurnersXI. Filter Drier XV. Replacement PartsXVII. Optional Hinged Access Doors XII. Protective DevicesSpark Gap Adjustment Typical Wiring Schematic 580F240, 208/230 V Shown Typical Component Arrangement 580F240 Shown Comp AHACLO EquipTroubleshooting Unit Troubleshooting II. ECONOMI$ERIV TroublshootingHeating Service Analysis EconoMi$erIV Troubleshooting CompletionProblem Cause Remedy Cooling Service Analysis IGC Control Heating and Cooling Demand Control Enthalpy EconoMi$erIV Input/Output LogicInputs Outputs Terminal†Humidistat IndexService Training Call for Free CatalogCopyright 2006 Bryant Heating & Cooling Systems Catalog no Page PRE-START-UP START-UP ChecklistTemperatures II. START-UP Electrical
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580F specifications

The Bryant 580F is a highly regarded gas furnace known for its exceptional heating performance and advanced technology. Designed for residential use, this model stands out for its reliability, efficiency, and user-friendly features that cater to modern heating demands.

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