York TPLCC Installation Manual

York TPLCC Installation Manual Manual pdf 10 page image

987158-UIM-B-101310 Johnson Controls Unitary ProductsDownflow FiltersDownflow furnaces typically are installed with the filters located abovethe furnace, extending into the return air plenum or duct. Any branchduct (rectangular or round duct) attached to the plenum must attach tothe vertical plenum above the filter height.Filter(s) may be located in the duct system external to the furnace usingan external duct filter box attached to the furnace plenum or at the endof the duct in a return filter grille(s). The use of straps and/or supports isrequired to support the weight of the external filter box.SECTION IV: GAS PIPINGGAS SAFETYGAS PIPING INSTALLATIONProperly sized wrought iron, approved flexible or steel pipe must beused when making gas connections to the unit. If local codes allow theuse of a flexible gas appliance connection, always use a new listed con-nector. Do not use a connector that has previously serviced another gasappliance.Some utility companies or local codes require pipe sizes larger than theminimum sizes listed in these instructions and in the codes. The furnacerating plate and the instructions in this section specify the type of gasapproved for this furnace - only use those approved gases. The instal-lation of a drip leg and ground union is required. Refer to Figure 16.The furnace must be isolated from the gas supply piping system byclosing its individual external manual shutoff valve during any pressuretesting of the gas supply piping system at pressures equal to or lessthan 1/2 psig (3.5 kPa).Gas piping may be connected from either side of the furnace using anyof the gas pipe entry on both sides of the furnace. Refer to Figure 13.GAS CONVERSION FOR PROPANE (LP)This furnace is constructed at the factory for natural gas-fired operation,but may be converted to operate on propane (LP) gas by using a fac-tory-supplied LP conversion kit. Follow the instructions supplied withthe LP kit.HIGH ALTITUDE NATURAL GAS ORIFICECONVERSIONThe National Fuel Gas Code requires that gas appliances installedabove 2,000 feet elevation have their inputs de-rated by 4% per 1,000feet above sea level. The modulating furnaces automatically de-rate foraltitude by measuring the inducer blower pressure and using that todetermine if there is adequate air to support good combustion. If thereis not enough combustion air to properly support 100% of the furnacenameplate input rate, the control will reduce the input to the point thatthere will be good combustion.An overpressure protection device, such as a pressure regulator,must be installed in the gas piping system upstream of the furnaceand must act to limit the downstream pressure to the gas valve so itdoes not exceed 0.5 PSI (14" w.c. (3.48 kPa). Pressures exceeding0.5 PSI (14” w.c. (3.48 kPa) at the gas valve will cause damage to thegas valve, resulting in a fire or explosion or cause damage to the fur-nace or some of its components that will result in property damageand loss of life.Plan your gas supply before determining the correct gas pipe entry.Use 90-degree service elbow(s), or short nipples and conventional90-degree elbow(s) to enter through the cabinet access holes.DANGER FIGURE 15: Gas ValveInletPressureTapOutletPressureTapOn/OffSwitchMainRegulatorAdjustmentFIGURE 16: Gas PipingUpflowConfigurationDownflowConfigurationHorizontalConfigurationExternalManualShut-offValveExternalManualShut-offValveExternalManualShut-offValveTo GasSupplyTo GasSupply To GasSupplyTo GasSupplyTo GasSupplyTo GasSupplyDripLegDripLeg DripLegDripLegDrip LegDrip LegGasValveGasPipeGasValveGas PipeGasValveGroundUnionGroundUnionGroundUnionGroundUnionGroundUnionNOTE: Ground Union maybe installed inside or outside unit.An accessible manual shutoff valve must be installed upstream of thefurnace gas controls and within 6 feet (1.8 m) of the furnace.The gas valve body is a very thin casting that cannot take any exter-nal pressure. Never apply a pipe wrench to the body of the gas valvewhen installing piping. A wrench must be placed on the octagon hublocated on the gas inlet side of the valve. Placing a wrench to thebody of the gas valve will damage the valve causing improper opera-tion and/or the valve to leak.LoNOx furnaces requiring propane (LP) gas must have the LoNOxscreens removed prior to installation and operation. See propaneinstructions.