York DNH018 Installation Manual

Also see for CHAMPION PLUS DNH018: Technical guide

York DNH018 Installation Manual Manual pdf 16 page image

66324-YIM-B-100416 Unitary Products Group3. 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 6.Adjust as follows:1. Remove the cap from the valve body. See Figure 6 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 0.2. The correct manifold pressurefor propane (LP) is 10.0 IWG 0.2.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.FIGURE 10 - GAS VALVE - FRONTMANUALGASSWITCH(SHOWNIN"OFFPOSITION)CONTROLELECTRICALCONNECTIONIGNITORELECTRICALCONNECTIONMANIFOLDPRESSURETAPGROUNDTERMINAL1/2-14NPT(OUTLET)PILOTGASCONNECTIONPILOTADJUSTMENTFIGURE 11 - GAS VALVE - REARVENTPRESSURELIMITER1/2-14NPT(INLET)LINEPRESSURETAPMANIFOLDPRESSUREADJUSTMENT(REMOVECAP)