York TL8E Installation Manual

York TL8E Installation Manual Manual pdf 16 page image

5532522-UIM-B-061916 Johnson Controls Ducted SystemsADJUSTMENT OF MANIFOLD GAS PRESSURE &INPUT RATEInlet and manifold gas pressure may be measured by connecting the“U” tube manometer to the gas valve with a piece of tubing. Follow theappropriate section in the instructions below. Refer to Figure 17 for adrawing of the locations of the pressure ports on the gas valve.Turn gas off at the ball valve or gas cock on gas supply linebefore the gas valve. Find the pressure ports on the gasvalve marked Out P and In P.1. The manifold pressure must be taken at the port marked OUT P.2. The gas line pressure must be taken at the port marked IN P.3. Using a 3/32” (2.4 mm) hex head wrench, loosen the set screw byturning it 1 turn counter clockwise. DO NOT REMOVE THE SETSCREW FROM THE PRESSURE PORT.Read the inlet gas pressureConnect the positive side of the manometer to the IN P Tap on the gasvalve. Do not connect any tubing to the negative side of the manometer,as it will reference atmospheric pressure. Refer to Figure 18 for connec-tion details.1. Turn gas and electrical supplies on and follow the operating instruc-tions to place the unit back in operation.2. Once the correct gas inlet pressure has been established, seeTable 9, turn the gas valve to OFF and turn the electrical supplyswitch to OFF; then remove the flexible tubing from the gas valvepressure tap and tighten the pressure tap plug using the 3/32” (2.4mm) hex head wrench.3. Turn the electrical and gas supplies back on, and with the burnersin operation, check for gas leakage around the gas valve pressureport for leakage using an approved non-corrosive gas leak detec-tion fluid, or other non-flammable leak detection methods.Read the manifold gas pressureConnect the positive side of the manometer to the OUT P Tap on thegas valve. Do not connect any tubing to the negative side of themanometer, as it will reference atmospheric pressure. Refer to Figure18 for connection details.1. Refer to Figure 17 for location of pressure regulator adjustment capand adjustment screws on main gas valve.2. Turn gas and electrical supplies on and follow the operating instruc-tions to place the unit back in operation.3. Adjust manifold pressure by adjusting gas valve regulator screw forthe appropriate gas per the following:4. After the manifold pressure has been adjusted, re-calculate the fur-nace input to make sure you have not exceeded the specified inputon the rating plate. Refer to “CALCULATING THE FURNACEINPUT (NATURAL GAS)”.5. Once the correct BTU (kW) input has been established, turn thegas valve to OFF and turn the electrical supply switch to OFF; thenremove the flexible tubing from the gas valve pressure tap andtighten the pressure tap plug using the 3/32” (2.4 mm) hex headwrench.6. Turn the electrical and gas supplies back on, and with the burnersin operation, check for gas leakage around the gas valve pressureport for leakage using an approved non-corrosive gas leak detec-tion fluid, or other non-flammable leak detection methods.Table 9: Inlet Gas Pressure RangeINLET GAS PRESSURE RANGEMinimum* MaximumNatural Gas 4.5” W.C. (1.12 kPa) 10.5” W.C. (2.61 kPa)IMPORTANT: The inlet gas pressure operating range table specifieswhat the minimum and maximum gas line pressures must be for thefurnace to operate safely. The gas line pressure MUST BE a mini-mum of:• 7” w.c. (1.74 kPA)in order to obtain the BTU input specified on the rating plate and/orthe nominal manifold pressure specified in these instructions and onthe rating plate.IMPORTANT: The cap for the pressure regulator must be removedto gain access to the adjustment screw. Loosening or tightening thecap does not adjust the flow of gas.Table 10: New: Nominal Manifold PressureNOMINAL MANIFOLD PRESSURENatural Gas 3.5" w.c. (0.87 kPa)FIGURE 17: Gas ValveIMPORTANT: If gas valve regulator is turned in (clockwise), manifoldpressure is increased. If screw is turned out (counter clockwise),manifold pressure will decrease.MANIFOLD PRESSURE “U” TUBE CONNECTIONFIGURE 18: Reading Gas PressureINLETWRENCHBOSSINLETPRESSUREPORTONOFFON/OFF SWITCH(Shown in ON position)MAIN REGULATORADJUSTMENTOUTLETOUTLETPRESSUREPORT VENT PORTA0226-001IGNITER3.5" GASPRESSURESHOWNAUX.LIMITSWITCHBURNERASSEMBLYFLAMESENSOR¼" TUBINGU-TUBEMANOMETEROUTLETPRESSURETAPGASVALVEA1103-001