York TP9C Series Installation Manual

Also see for CP9C Series: User's information manual User's information manual

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York TP9C Series Installation Manual Manual pdf 11 page image

1083292-UIM-A-0114Johnson Controls Unitary Products 11GAS 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.The factory gas orifice sizes are based on a gas heating value of1030 BTU/cu.ft., so if your gas value is significantly higher or lowerthan that, it may be necessary to change to smaller or larger gasorifices.The chart below shows recommended gas orifice sizes to use at vari-ous altitudes and at various de-ration levels. To use the chart, followthese instructions:1. Clock the gas meter and calculate the actual input rate using yourlocal gas heating value. See "CALCULATING THE FURNACEINPUT (NAT. GAS)" in this manual.2. Divide that input rate by the input rate shown on the furnace ratingplate to get the actual de-ration percent.3. Read down the left-hand “Actual Rate” column to find the closestnumber to your actual de-ration percent.4. Read across that row to the column for the elevation at your loca-tion. The number listed there is the orifice size that is proper foryour unit.Example – You have a 100,000 BTU/H furnace installed at an elevationof 6,000 feet. You clock the gas meter and find that the furnace is actu-ally fired at 64,000 BTU/H. Divide 64,000 by 100,000, which gives 0.64(64%). The closest number to 64% in the left-hand “Actual Rate” col-umn is 65. Read across that row to the column for 6,000 feet elevation,which shows “#43”. You should change from the factory #45 orifices tolarger #43 orifices, which will bring the input rate back up to approxi-mately 76,000 BTU/H, which is what it should be for that furnace at6,000 feet.SECTION V: ELECTRICAL POWERELECTRICAL POWER CONNECTIONSField wiring to the unit must be grounded. Electric wires that are fieldinstalled shall conform to the temperature limitation for 63°F (35°C) risewire when installed in accordance with instructions. Refer to Table 6 inthese instructions for specific furnace electrical data.Table 5: High Altitude OrificesActual Rate(percent ofnameplate)Elevation in Feet Above Sea Level4,000 5,000 6,000 7,000 8,000 9,000 10,00084% 80% 76% 72% 68% 64% 60%Orifice Drill Size100 48 49 49 50 51 51 5295 47 48 49 50 50 50 5190 46 47 48 49 49 49 5085 45 46 47 48 49 49 5080 45 45 46 47 48 48 4975 44 45 45 45 47 47 4970 43 44 44 45 45 45 4865 42 43 43 44 45 45 4760 41 42 42 43 44 45 4655 40 41 41 32 43 43 4450 39 40 40 40 43 42 42PROPANE KITSIt is very important to choose the correct kit and/or gas orifices for the altitude and the type of gas for which the furnace is being installed.Only use natural gas in furnaces designed for natural gas. Only use propane (LP) gas for furnaces that have been properly converted to use pro-pane (LP) gas. Do not use this furnace with butane gas.Incorrect gas orifices or a furnace that has been improperly converted will create an extremely dangerous condition resulting in premature heatexchanger failure, excessive sooting, high levels of carbon monoxide, personal injury, property damage, a fire hazard and/or death.High altitude and propane (LP) conversions are required in order for the appliance to satisfactory meet the application.An authorized distributor or dealer must make all gas conversions.In Canada, a certified conversion station or other qualified agency, using factory specified and/or approved parts, must perform the conversion.The installer must take every precaution to insure that the furnace has been converted to the proper gas orifice size when the furnace is installed.Do not attempt to drill out any orifices to obtain the proper orifice size. Drilling out a gas orifice will cause misalignment of the burner flames,causing premature heat exchanger burnout, high levels of carbon monoxide, excessive sooting, a fire hazard, personal injury, property damageand/or death.Use copper conductors only.