York P*XU/G9D-UP Installation Instruction

Contents

035-17480-000 Rev. A (800)Unitary Products Group 9Some utility companies or local codes require pipe sizeslarger than the minimum sizes listed in these instructions andin the codes. Properly sized wrought iron, approved flexibleor steel pipe must be used when making gas connections tothe unit. The installation of a drop leg and ground union isrequired (refer to Figure 5).Gas piping may be connected from either side of the furnaceusing any of the gas pipe entry knockouts on both sides ofthe furnace (refer to Figure 1 for locations and dimensions).NOTE: Plan your combustion air piping before determiningthe correct gas pipe entry. Use 90 degree service elbow(s), orshort nipples and conventional 90 degree elbow(s) to enterthrough the cabinet access holes.NOTE: An accessible manual shutoff valve must be installedupstream of the furnace gas controls and within 6 feet of thefurnace.NOTE: A 1/8” NPT plug is included in the inlet side of the gasvalve for measuring incoming gas pressure.The furnace must be isolated from the gas supply piping sys-tem by closing its individual external manual shutoff valveduring any pressure testing of the gas supply piping systemat pressures equal to or less than 1/2 psig (3.48 kPa).The furnace and its individual shutoff valve must be discon-nected from the gas supply piping system during any pres-sure testing of that system at test pressures in excess of 1/2psig (3.48 kPa).ELECTRICAL POWER CONNECTIONField wiring to the unit must conform to and be grounded inaccordance with the provisions of the National ElectricalCode ANSI/NFPA No. 70-latest edition, Canadian ElectricCode C22.1 Part 1 - (latest edition) and/or local codes. Elec-tric wires which are field installed shall conform with the tem-perature limitation for 63°F/35°C rise wire when installed inaccordance with instructions. Refer the rating plate or Physi-cal and Rating Data Tables in these instructions for specificfurnace electrical data.Provide a power supply separate from all other circuits. Installovercurrent protection and disconnect switch per local/national electrical codes. The switch should be close to theunit for convenience in servicing. With the disconnect switchin the OFF position, check all wiring against the unit wiringlabel. Also, see the wiring diagram in this instruction.An overpressure protection device, such as apressure regulator, which conforms to the NationalFuel Gas Code, ANSI Z223.1 (U.S.) or CAN-B149.1 or.2 (Canada) and acts to limit the down-stream pressure to a value that does not exceed0.5 PSI (14" w.c.), must be installed in the gas pip-ing system upstream of the furnace. Failure to doso may result in a fire or explosion or cause dam-age to the furnace or some of its components.INLET GAS PRESSURE RANGENatural Gas Propane (LP)Minimum 4.5 In. W.C. 11 In. W.C.Maximum 13.9 In. W.C. 13.9 In. W.C.FIGURE 5 : Gas PipingGASVALVEDROPLEGGROUNDJOINTUNIONMAYBEINSTALLEDINSIDEOROUTSIDEUNITTOGASSUPPLYEXTERNALMANUALSHUTOFFVALVETOGASSUPPLYDROPLEGCompounds used on threaded joints of gas pipingmust be resistant to the action of liquefied petro-leum gases. After connections are made, leak-testall pipe connections.After all gas piping connections are completed,leak test all joints, fittings and furnace connectionswith rich soap and water solution, commerciallyavailable bubble type leak detection fluid, or otherapproved means.Do not use an open flame or other source ofignition for leak testing.Never apply a pipe wrench to the body of the com-bination automatic gas valve. A wrench must beplaced on the projection or wrench boss of thevalve when installing piping to it.