York Sunline 2000 D3CG090 Installation Instructions Manual

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York Sunline 2000 D3CG090 Installation Instructions Manual Manual pdf 17 page image

ADJUSTMENT OF TEMPERATURE RISEThe temperature rise (or temperature difference between thereturn air and the heated air from the furnace) must lie withinthe range shown on the U.L. or CGA rating plate.After the temperature rise has been determined, the cfm canbe calculated as follows:After about 20 minutes of operation, determine the furnacetemperature rise. Take readings of both the return air and theheated air in the ducts (about six feet from the furnace) wherethey will not be affected by radiant heat. Increase the blowercfm to decrease the temperature rise; decrease the blower cfmto increase the rise. Refer to Table 8 for blower motor and drivedata.CHECKING GAS INPUTNATURAL GAS1. Turn off all other gas appliances connected to the gas meter.2. With the furnace turned on, measure the time needed forone revolution of the hand on the smallest dial on the meter.A typical gas meter usually has a 1/2 or a 1 cubic foot testdial.3. Using the number of seconds for each revolution and thesize of the test dial increment, find the cubic feet of gasconsumed per hour from TGas Rate table.If the actual input is not within 5% of the furnace rating (withallowance being made for the permissible range of theregulator setting), replace the orifice spuds with spuds of theproper size.CFM = Btuh Input x 0.81.08 x oF Temp. RiseSECURE OWNER’S APPROVAL:When the system is functioning properly, secure the owner’s approval. Show him thelocation of all disconnect switches and the thermostat. Teach him how to start and stop the unit and how to adjust temperaturesettings within the limitations of the system.Secondsfor OneRev.Size of Test Dial1/2 cu. ft. 1 cu. ft.1012141618180150129113100360300257225200202224262890827569641801641501381293032343638605653504712011310610095404244464845434139379086827875505254565860363534323130726967646260Example: By actual measurement, it takes 19 seconds for the hand on the 1-cubicfoot dial to make a revolution with just a 100,000 Btuh furnace running. Using thisinformation, interpolate for 19 seconds in the first column in the table above. Readacross to the column headed “1 Cubic Foot”, where you will see that 190 cubicfeet of gas per hour are consumed by the furnace at that rate. Multiply 190 x 1050(the Btu rating of the gas obtained from the local gas company). The result is199,500 Btuh, which is close to the 204,000 Btuh rating of the furnace.TABLE 13 - GAS RATE - CUBIC FEET PER HOUR530.18-N10YUnitary Products Group 17

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