York TPLCC Installation Manual

York TPLCC Installation Manual Manual pdf 26 page image

987158-UIM-B-101326 Johnson Controls Unitary ProductsADJUSTMENT OF MANIFOLD GAS PRESSUREInlet 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 30 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 inlet gas line pressure must be taken at the port marked IN P.3. Using a 3/16” allen wrench, remove the plugs from the inlet and out-let pressure ports. Connect a 1/8” UPT barbed hose fitting to eachpressure port.4. Refer to Figure 30 for location of pressure regulator adjustment capand adjustment screws on main gas valve.5. Turn gas and electrical supplies on and follow the operating instruc-tions to place the unit back in operation.6. Remove the small plastic cap to gain access to the regulator adjust-ment screw.7. Use a small slotted screwdriver to turn the regulator adjustmentscrew. Adjust the pressure by turning the screw one click at a timeuntil desired pressure is reached. Wait a few seconds after eachadjustment to allow the pressure to stabilize before making addi-tional adjustments. This is an electronic adjustment screw that doesnot require very much force. Application of excessive force to theadjustment screw will damage the gas valve.8. 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 FURNACE INPUT(NATURAL GAS)".9. Once the correct BTU (kW) input has been established, turn the gasvalve to OFF and turn the electrical supply switch to OFF; thenremove the flexible tubing and fittings from the gas valve pressuretap replace the pressure tap plugs.10.Turn the electrical and gas supplies back on, and with the burners inoperation, check for gas leakage around the gas valve pressure portfor leakage using an approved gas detector, a non-corrosive leakdetection fluid, or other leak detection methods.ADJUSTMENT OF TEMPERATURE RISEAfter about 5 minutes of operation, determine the furnace temperaturerise. Take temperature readings of both the return air and the heated airin the ducts about six feet away from the furnace, where they will not beaffected by radiant heat. Increase or decrease the temperature rise bychanging the ATR jumper on the furnace control board. The jumper isfactory-set to deliver an air temperature rise near the midpoint of thenameplate temperature rise range. If more air is desired (lower temper-ature rise), move the jumper to the -10 position. If less air is desired(higher temperature rise), move the jumper to the +10 position.Table 11: Inlet Gas Pressure RangeINLET GAS PRESSURE RANGENatural Gas Propane (LP)Minimum* 4.5” w.c. (1.12 kPa) 8.0” w.c. (1.99 kPa)Maximum 10.5” w.c. (2.61 kPa) 13.0” w.c. (3.24 kPa)The inlet gas pressure operating range table specifies what the mini-mum and maximum gas line pressures must be for the furnace tooperate safely. The gas line pressure MUST BE a minimum of:• 7” w.c. (1.74 kPA) for Natural Gas• 11” w.c. (2.74 kPA) for Propane (LP) Gasin order to obtain the BTU input specified on the rating plate and/orthe nominal manifold pressure specified in these instructions and onthe rating plate.The cap for the pressure regulator must be removed to gain access tothe adjustment screw.The regulated outlet pressure has been calibrated at the factory.Additional pressure adjustment should not be necessary. If adjust-ment is necessary, set to the following specifications. After adjust-ment, check for gas leakage.TABLE 12: Nominal Manifold PressureNOMINAL MANIFOLD PRESSURENatural Gas (Max) 3.5" w.c. (0.87 kPa)Natural Gas (Min) 0.5" w.c. (0.15 kPa)Propane (LP) Gas (Max) 10.0" w.c. (2.49 kPa)Propane (LP) Gas (Min) 1.6" w.c. (0.40 kPa)NOTICEFIGURE 30: Gas ValveIf gas valve regulator is turned clockwise, manifold pressure isincreased. If screw is turned counterclockwise, manifold pressure willdecrease.The adjustment screw has a range of 16 clicks (about ±0.5” manifoldpressure). There is not a hard stop at the ends of the adjustmentrange. When the limit of the adjustment range is reached, the nextclick will start over at the other end of the range. For instance, if youare increasing pressure and reach the upper limit of adjustment thenext click will drop the pressure to the lower limit.The temperature rise, or temperature difference between the returnair and the supply (heated) air from the furnace, must be within therange shown on the furnace rating plate and within the applicationlimitations shown in Table 6.The supply air temperature cannot exceed the “Maximum SupplyAir Temperature” specified in these instructions and on the furnacerating plate. Under NO circumstances can the furnace be allowed tooperate above the Maximum Supply Air Temperature. Operating thefurnace above the Maximum Supply Air Temperature will cause pre-mature heat exchanger failure, high levels of Carbon Monoxide, a firehazard, personal injury, property damage, and/or death.InletPressureTapOutletPressureTapOn/OffSwitchMainRegulatorAdjustmentDANGER