Bryant 580G VIII. Electrical Connections, Controls Options, Power Wiring, Field Power Supply

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VIII. ELECTRICAL CONNECTIONS

A. Controls Options

The standard constant volume (CV) units, as shipped, are operable as stand-alone units, using a standard (mechanical or electronic) 2-stage heat, 2-stage cool thermostat.

With a standard thermostat (programmable is optional), heat- ing and cooling operation is set by space temperature. The standard DDC (direct digital controls) are installed in the con- trol box. The DDC control board diagram is shown in Fig. 11.

Features with Thermostat Control of Unit

·two-stage heating

·two-stage cooling

·control of unit using Y1, Y2, W1, W2, and G thermostat inputs

·control of the indoor fan

·outdoor-air temperature/supply-air temperature monitoring

·control of modulating economizer damper to provide free cooling when outdoor conditions are suitable, using supply- air temperature as a control point

·control of the economizer damper and indoor fan to obtain unoccupied free cooling

·provide power exhaust output to an external power exhaust controller

·support a ®eld test for ®eld checkout

·control of 2 stages of CV power exhaust

·compressor time delay for power up and minimum off and on times

An electronic expansion board may be ®eld-installed to pro- vide the following features:

·control of modulating economizer damper to maintain indoor air quality (IAQ) when outdoor conditions are suitable

NOTE: The IAQ sensor must be set for current output (4 to 20 mA). This requires removing the sensor cover and remov- ing a jumper on the sensor. See Fig. 12.

·provide discrete inputs for fan status, ®lter status, ®eld- applied status, and demand limit

·provide an output for the external alarm light indicator

·provide power exhaust ®re outputs for direct control of power exhaust stages during ®re or smoke control modes

·control of smoke control modes including evacuation, smoke purge, pressurization, and ®re shutdown (non-modulating or modulating power exhaust required)

B. Power Wiring

Units are factory wired for the voltage shown on the unit name- plate. The main terminal block is suitable for use with alu- minum or copper wires.

When installing units, provide a disconnect per NEC (National Electrical Code) of adequate size (MOCP [maxi- mum overcurrent protection] of unit is on the informative plate). All ®eld wiring must comply with NEC and all local codes. Size wire based on MCA (minimum circuit amps) on the unit informative plate. See Fig. 13 for power wiring connections to the unit power terminal block and equipment ground.

The main power terminal block is suitable for use with alu- minum or copper wire. See Fig. 13. Units have circuit break- ers for compressors, fan motors, and control circuit. If required by local codes, provide an additional disconnect, per NEC and

local codes requirements, of adequate size (Table 3). When- ever external electrical sources are used, unit must be elec- trically grounded in accordance with local codes, or in absence of local codes, with NEC, ANSI C1-latest year.

All ®eld wiring must comply with NEC and local code requirements.

C. Field Power Supply

Unit is factory wired for voltage shown on nameplate. See Table 3 for electrical data.

Field wiring can be brought into the unit from bottom (through basepan and roof curb) or through side of unit (corner post next to control box).

A 31¤2-in. NPT knockout for ®eld power wiring and a 3¤4-in. NPT knockout for 24-v control wiring are provided in base- pan. In the side post, there are two 21¤2-in. knockouts for the ®eld power wiring. See Fig. 2 and 3. If control wiring is to be brought in through the side of unit, a 7¤8-in. diameter hole is provided in the condenser side post next to the control box.

If disconnect box is mounted to corner post, be careful not to drill any screws into the condenser coil.

Routing Through Bottom of Unit

If wiring is brought in through bottom of unit, use ®eld- supplied watertight conduit to run power wiring from base- pan out through bottom 31¤2-in. hole to the disconnect box and back into unit to the main control box.

Use strain relief going into control box through 21¤2-in. diam- eter hole provided. After wires are in unit control box, con- nect to power terminal block (see Power Wiring section on this page).

Low-voltage wiring must be run in watertight conduit from the basepan to control box and through 1-in. diameter hole provided in bottom of unit control box. Field-supplied strain relief must be used going into the box. After wiring is in con- trol box, make connections to proper terminals on terminal blocks (see Field Control Wiring section on page 11).

Install conduit connector in unit basepan or side panel open- ings provided. Route power and ground lines through con- nector to connections in unit control box as shown on unit wiring diagram and Fig. 13.

Routing Through Side of Unit

Route power wiring in ®eld-supplied watertight conduit into unit through 21¤2-in. hole. Strain relief (®eld supplied) must be used in hole.

Use ®eld-supplied strain relief going into control box through 21¤2-in. diameter hole provided. After wires are in unit con- trol box, connect to power terminal block (see Power Wiring section on this page).

Bring low-voltage control wiring through factory-drilled 7¤8-in. diameter hole in condenser side post. Use strain relief going into 7¤8-in. diameter hole in bottom of unit control box.

After wiring is in control box, make connection to proper ter- minals on terminal blocks (see Field Control Wiring section on page 11).

WARNING: The unit must be electrically grounded in accordance with local codes and NEC ANSI/NFPA 70 (National Fire Protection Association).

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Contents Safety Considerations ContentsRoof Curb Installation Provide Unit SupportAlternate Unit Support II. RIG and Place UnitUnit Size Operating Corner Weight Base Unit Dimensions, 580G240-360Base Unit Dimensions, 580H240-360 Unit Weight Must be in Place When RiggingUnit 580G,H SpecicationsIV. Unit Duct Connections III. Field Fabricate DuctworkFlue Hood VI. Trap Condensate DrainVII. GAS Piping Field Power Supply Power WiringVIII. Electrical Connections Controls OptionsLED SIOField Control Wiring Electrical Data Ð 580G,H240-360 Ð13Ð Economizer IX. OUTDOOR-AIR Inlet AssemblyAdding Seal Strip to Mounting Flange Hood Sides Mounting Angle With Tabs Attached to Filter Track Assembly Economizer SettingsEnthalpy Control and Sensor Economizer Details Power EXHAUST/BAROMETRIC Relief Damper HoodMotormaster III Control Installation XI. AccessoriesPRE-START-UP Low Ambient Kit Sensor LocationDIP Switch Factory Settings DIP Switch CongurationSTART-UP Cooling Section START-UP and Adjustments Checking Cooling Control OperationII. Heating Section START-UP and Adjustments Smoke Detector Smoke Control ModesIndoor Air Quality Control Time Guard CircuitEvaporator Fan Performance Adjustment IV. Indoor Airflow and Airflow AdjustmentsHead 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 Care and Maintenance VII. Power Exhaust OperationVI. Main Burners VIII. Head Pressure ControlService CleaningII. Lubrication Spark Gap Adjustment IV. EVAPORATOR-FAN Motor Replacement III. Evaporator FAN Service and ReplacementPower Failure VI. Refrigerant ChargeVII. Filter Drier XIII. Replacement PartsVIII. Thermostatic Expansion Valve TXV IX. Protective DevicesTroubleshooting II. Error Code Summary Control Board LED AlarmsIGC Board Error Code Summary LED Error Description Troubleshooting Blinks Code CommentsI/O Channel Designations Base Module Terminal AssignmentSAT IGC Control Heating and Cooling IDM AHAIFC IfcbTable B Table aPower Schematic 580G,H240-360 Ð 24 V Control Schematic 580G,H240-360 Component Arrangement 580G,H240-360 Packaged Service Training Temperatures START-UP ChecklistSTART-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.

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