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The inducer motor should run but the burner will not ignite. Allow inducer motor to run for 4 to 5 hours. Reconnect red wire to terminal 2 at IGN and remove R-W jumper at the-control voltage terminal board. Proceed as follows to complete heating section start-up. Follow the lighting instructions on the heating section operation label (located inside the burner access door) to start the heating section. When lighting the unit for the first time, perform the following: If the gas supply pipe was not purged before connecting the unit, it will be full of air. It is recommended that the ground joint union be loosened, and the supply line be allowed to purge until the odor of gas is detected. Never purge gas lines into a combustion chamber. Immediately upon detection of gas odor, retighten the union. Allow 5 minutes to elapse, then light unit using the following steps. CHECK HEATING CONTROL - Start and check the unit for proper heating control operation as follows: (See furnace lighting instructions located inside burner access panel.) 1. Place the room thermostat SYSTEM switch in the HEAT position and the fan switch in the AUTO, position. 2. Set the heating temperature control of the thermostat above room temperature. 3. Observe that after built-in time delays, the pilot automatically lights, the burners light and the blower motor starts. 4. Observe that the burners and pilot go out, and that after a built-in delay the blower motor stops when the heating control setting of the thermostat is satisfied. NOTE: The 060-size 460-v models are equipped with a 3-phase blower motor. Check blower wheel for correct rotation as indicated by arrow on blower housing. If blower wheel rotates in opposite direction, reverse any 2 blower motor leads or any 2 line voltage leads. Recheck blower wheel rotation if necessary to reverse leads. CHECK GAS INPUT — Check gas input and manifold pressure after unit start-up. (See Table 4.) If adjustment is required, proceed as follows. The rated gas inputs shown in Table 4 are for altitudes from sea level up to 2000 ft above sea level. These inputs are based on natural gas with a heating value of 1050 Btu/ ft3 at 0.65 specific gravity, or propane gas with a heating value of 2500 Btu/ft at 1.5 specific gravity. For elevations above 2000 ft, reduce input 4% for each 1000 ft above sea level. When the gas supply being used has a different heating value or specific gravity, refer to national and local codes, or contact your Distributor or Branch to determine the required orifice size. A CAUTION These units are designed to consume the rated gas inputs using the fixed orifices at specified manifold pressures as shown in Table 4. DO NOT REDRILL THE ORIFICES UNDER ANY CIRCUMSTANCES. ADJUST GAS INPUT — The gas input to the unit is determined by measuring the gas flow at the meter or by measuring the manifold pressure. Measuring the gas flow at the meter is recommended for natural gas units. The manifold pressure must be measured to determine the input of propane gas units. Measure Gas Flow (Natural Gas Units') — Minor adjustment to the gas flow can be made by changing the manifold pressure. The manifold pressure must be maintained between 3.2 and 3.8 in. wg. If larger adjustments are required, change main burner orifices following the recommendations of national and local codes. 11 Table 4 — Rated Gas Inputs UNIT 48 NUMBER OF ORIFICES GAS SUPPLY PRESSURE (in. wg) MANIFOLD PRESSURE (in. wg) NATURAL GAS PROPANE* Natural Propane Orifice Drill Size Heating Input (Btuh)t Orifice Drill Size Heating Input (Btuh)t Min Max Min Max Natural Propane NLT018,024,030 2 5.0 13.6 11 0 13 6 35 10.5 44 40,000 55 40,000 NLT036.042; NHT024; NMT030 3 50 13.6 11.0 13.6 3.5 10.5 44 60,000 55 60,000 NLT048.060; NMT036,042; NHT030 4 5.0 13.6 11.0 13.6 3.5 105 44 80,000 55 80,000 NET036,042 4 5.0 136 11 0 13.6 3.5 10.5 42 96,000 54 96,000 NMT048.060; NHT036.042 5 5.0 13.6 11.0 13.6 3.5 10.5 44 100,000 55 100,000 NHT048,060; NVT036,042 6 5.0 13.6 11.0 13.6 35 10.5 44 120,000 55 120,000 NVT048.060 6 50 13.6 11.0 136 3.5 10.5 42 144,000 54 144,000 ‘When a 48N unit is converted to propane, the unit must be modified. See kit instructions. tBased on altitudes from sea level up to 2000 ft above sea level. For altitudes above 2000 ft, reduce input rating 4% for each 1000 ft above sea level In Canada, from 2000 ft above sea level to 4500 ft above sea level, derate the unit 10%. NOTE: All other appliances that use the same meter must be turned off when gas flow is measured at the meter. Proceed as follows: 1. Turn off gas supply to unit. 2. Remove pipe plug on outlet of gas valve, then connect manometer at this point. Turn on gas to unit. 3. Record number of seconds for gas meter test dial to make one revolution. 4. Divide number of seconds in Step 3 into 3600 (number of seconds in one hour). 5. Multiply result of Step 4 by the number of cu ft shown for one revolution of test dial to o...

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