York AFFINITY SERIES R-410A Installation Manual

Also see for AFFINITY DNX024: Technical guide

279550-YIM-A-0207Unitary Products Group 25Circulating FanWhen the thermostat calls for FAN, the thermostat terminal G isenergized signaling the circulating fan to run at the heat speed2 seconds after the G terminal is energized.If a call for HEAT occurs, the circulating fan continues to run atthe heat speed.If a call for COOL occurs, the circulating fan switches to coolspeed according to the fan delay profile selected in Table 17.When the thermostat ends the call for FAN, the thermostatterminal G is de-energized, de-energizing the circulating fan.Start-UpPrestart Check ListComplete the following checks before starting the unit.1. Check the type of gas being supplied. Be sure that it is thesame as listed on the unit nameplate.2. Make sure that the vent outlet air hood has been properlyinstalled.Operating Instructions1. STOP! Read the information on the unit safety label.2. Set the thermostat to the OFF position.3. Turn off all electrical power to the unit.4. DO NOT try to light the burners by hand. This appliance isequipped with an ignition device which automatically lightsthe burners.5. Remove the access panel.6. Turn the gas valve switch to the OFF position.7. Wait five (5) minutes to clear out any gas. If you then smellgas, STOP! Follow B in the information on the unit safetylabel. If you don't smell gas, go to the next step.8. Turn the gas valve switch to the ON position.9. Replace the control access panel.10. Turn on all electric power to the unit.11. Set the thermostat to the desired setting.12. If the unit will not operate, follow the instructions To TurnOff Gas To Appliance and call your service technician orgas supplier.To Turn Off Gas To Unit1. Set the thermostat to the OFF position.2. Turn off all electric power to the appliance if service is to beperformed.3. Remove the control access panel.4. Turn the gas valve switch to the OFF position. DO NOTFORCE.5. Replace the control access panel.Post Start Check ListAfter the entire control circuit has been energized and theheating section is operating, make the following checks:1. Check for gas leaks in the unit piping as well as the supplypiping.2. Check for correct manifold gas pressures. See CheckingGas Input.3. Check the supply gas pressure. It must be within the limitsshown on rating nameplate. Supply pressure should bechecked with all gas appliances in the building at full fire. Atno time should the standby gas line pressure exceed 13.5",nor the operating pressure drop below 4.5" for natural gasunits. If gas pressure is outside these limits, contact thelocal gas utility for corrective action.Manifold Gas Pressure AdjustmentSmall adjustments to the gas flow may be made by turning thepressure regulator adjusting screw on the automatic gas valve.Refer to Figures 15 and 16.Figure 15: Single Stage Gas Valve FrontElectricalConnectionManualGas SwitchPilotAdjustment(Remove Cap)ManifoldPressureAdjustment(Remove Cap)Pilot GasConnection ManifoldPressure Tap½ NPT(Outlet)