Bard WG Series Installation Instructions Manual

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Bard WG Series Installation Instructions Manual Manual pdf 20 page image

Manual 2100-587JPage 20 of 59NOTE: The voltage should be measured at the fieldpower connection point in the unit and whilethe unit is operating at full load (maximumamperage operating condition).17. THERMOSTATS16. WIRING – LOW VOLTAGE WIRINGLow Voltage ConnectionThese units use a 24 volt AC low voltage circuit.The “R” terminal is the hot terminal and the “C”terminal is grounded.“G” terminal is the fan input.“Y” terminal is the economizer input (where equipped).“Y1” terminal is the compressor input.“Y2” terminal is the compressor staging solenoid input.“R” terminal is 24 VAC hot.“C” terminal is 24 VAC grounded.“A” terminal is the ventilation input. This terminalenergizes any factory or field installed vent option.“2” terminal is the alarm output.“W1” terminal is the gas heat input.230/208 Volt UnitsAll models are equipped with dual primary voltagetransformers. All equipment leaves the factory wiredon 240V tap. For 208V operation, reconnect from240V to 208V tap. The acceptable operating voltagerange for the 240V and 208V taps are:460 Volt UnitsAll models are equipped with single primary voltagetransformers and no rewiring is required.Direct Digital Controls (DDC)For total and proper control using DDC, a total of fivecontrolled outputs are required (four if no ventilation isinstalled).TABLE 3Thermostat Wire SizeTABLE 4Wall ThermostatLOW VOLTAGE CONNECTIONS FOR DDC CONTROLFan Only Energize GCooling Mode (Low) Energize G, Y1Cooling Mode (High) Energize G, Y1, Y2Heating Mode Energize W1Ventilation Energize G, AThermostat Predominant Features8403-058(TH5220D1151)2 stage Cool; 2 stage HeatElectronic Non-ProgrammableAuto or Manual changeover8403-060(1120-445)3 stage Cool; 3 stage HeatProgrammable/Non-ProgrammableElectronicHP or ConventionalAuto or Manual changeover8403-082(VT8600U5500B)2 stage Cool; 2 stage HeatProgrammable/Non-ProgrammableElectronicHP or Conventional, Auto or Manualchangeover with Occupancy Sensor,BACnet8403-084(VT8600U5000B)2 stage Cool; 2 stage HeatProgrammable/Non-ProgrammableElectronicHP or Conventional, Auto or Manualchangeover with BACnet8403-090(T6 Pro)2 stage Cool; 3 stage Heat – Heat Pump2 stage Cool; 2 stage Heat – ConventionalProgrammable/Non-ProgrammableElectronicAuto or Manual changeoverTap Range240 253 – 206208 220 – 187Transformer VA FLA Wire GaugeMaximumDistancein Feet50 2.120 gauge18 gauge16 gauge14 gauge12 gauge4560100160250