York DNH 030 Installation Manual

Also see for DNH 030: Technical guide Installation manual

York DNH 030 Installation Manual Manual pdf 16 page image

282911-YIM-B-080716 Unitary Products Group2. Turn off all electric power to the appliance if service is tobe performed.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 LIST (GAS)After 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 sup-ply piping.2. Check for correct manifold gas pressures. See CheckingGas Input.3. Check the supply gas pressure. It must be within the lim-its shown on rating nameplate. Supply pressure shouldbe checked with all gas appliances in the building at fullfire. At no time should the standby gas line pressureexceed 10.5", nor the operating pressure drop below4.5" for natural gas units. If gas pressure is outside theselimits, contact the local gas utility for corrective action.MANIFOLD GAS PRESSURE ADJUSTMENTSmall adjustments to the gas flow may be made by turningthe pressure regulator adjusting screw on the automatic gasvalve. Refer to Figure 10.Adjust as follows:1. Remove the cap from the valve body. See Figure 10 forlocation.2. To decrease the gas pressure, turn the adjusting screwcounterclockwise.3. To increase the gas pressure, turn the adjusting screwclockwise.NOTE: The correct manifold pressure for natural gas fur-naces is 3.5 IWG. The correct manifold pressure forpropane (LP) is 10.0 IWG.BURNER INSTRUCTIONSTo check or change the burners, CLOSE THE MAIN MAN-UAL SHUT-OFF VALVE AND SHUT OFF ALL POWER TOTHE UNIT.1. Remove the two (2) #8 screws holding each burner inplace.2. Remove the burner assembly from the manifold assem-bly by moving the burner assembly forward, turn at anangle and pull back.3. Burners are now accessible for service.PILOT INSTRUCTIONSTo check, adjust or remove the pilot assembly, CLOSE THEMAIN MANUAL SHUT-OFF VALVE AND SHUT OFF ALLPOWER TO THE UNIT.The pilot flame should envelope 3/8 inch of the end of theflame sensor and not contain any yellow color, see Figure 12.FIGURE 10 - GAS VALVE - FRONTElectricalConnectionManualGas SwitchPilotAdjustment(Remove Cap)ManifoldPressureAdjustment(Remove Cap)Pilot GasConnection ManifoldPressure Tap½ NPT(Outlet)FIGURE 11 - GAS VALVE - REARLinePressureTap½ NPT(Inlet)