Assessments - 3, GPA: 4.3 ( )

Fabricante : Sears Arquivo Tamanho: 2.69 mb Arquivo Nome : Língua de Ensino:

• Flames do NOT touch sides of heat exchanger If any problems with main burner flames are noted, it may be necessary to adjust gas pressures or check for drafts. Main Burner 10-10-78 NOTE: For Ignitor location see Figure 39. 441 01 261302 Ignitor Location NOTE: Flame sensor has a different orientation in all 050 models. Air TemperatureRise Check REDUCED FURNACE LIFE HAZARD Failure to properly set the air temperature rise may result in reduced furnace life. Use ONLY the blower motor speed taps marked "Y" for YES for setting air temperature rise. Blower Motor Speed Taps for NSMPNtL and *8MPN/L Model Sizes LO MLO MHI HI ModelSizes RED BLUE ORN BLK 050B12 N Y YN 075B12 N Y YY 075F16 N NYY 100F14 N NYY 100F20 N Y YY 100J20 N Y YY 100J22 Y Y YN 125J20 N Y YY 125J22+ Y Y YY 150J20{ N Y YY +N8MPN only { _8MPN only The blower speed MUST be set to give the correct air temperature rise through the furnace as marked on the rating plate. Temperature rise is the difference between supply and return air temperatures. To check temperature rise, use the following procedure: 1. Place thermometers in supply and return air registers as close to furnace as possible, avoiding direct radiant heat from heat exchangers. 2. Operate furnace for 10 minutes with all the registers and duct dampers open by using a jumper wire on R to W thermostat connections on the fan board. 3, Take readings and compare with range specified on rating plate. 4. If the air temperature rise is not in the correct range, the blower speed must be changed. A higher blower speed will lower the temperature rise. A lower blower speed will increase the temperature rise. 5. Removethe ULU.m._erwire after the adiustments are complete. 441 01 261302 Changing Blower Speed ELECTRICAL SHOCK HAZARD. Failure to disconnect power could result in death, personal injury and/or component damage. Turn OFF power to furnace before changing speed taps. NOTE: The speed taps that the manufacturer sets at the factory for this furnace are based on a nominal 400 CFM per ton cooling and the basic mid range on the temperature rise for heating. Since the manufacturer cannot predict the static pressure that will be applied to the furnace, it is the responsibility of the installer dealer/contractor to select the proper speed tap leads for the application when the furnace is installed. If it is necessary to change speeds, refer to steps below. 1. Refer to Furnace Wiring Diagram for location of the heating and cooling speed taps located on the electronic furnace control as well as location of unused blower motor speed leads. Use the chart (Table 8 ) to determine the blower motor speed settings. I Blower Speed Chart Wire Color Motor Speed Black High Orange* Med-High Blue Med-Low Red Low * Med-High speed may not be provided on all models. 2. Change the heat or cool blower motor speed by removing the motor speed lead from the "Heat" or "Cool" terminal and replace it with the desired motor speed lead from the "M1" or "M2" location. Connect the wire previously removed from the "Heat" or "Cool" terminal to the vacated "M1" or "M2" terminal. 3. If the same speed must be used for both heating and cooling, remove the undesired motor speed lead from the "Heat" or "Cool" terminal and connect that lead to the open terminal at "MI" or "M2" location or tape off. Attach a jumper between the "Heat" and "Cool" terminals and the remaining motor speed lead. Note: When using the same speed on motors with (4) speed leads, it will be necessary to tape off the terminal of the motor speed lead removed from the "Heat" or "Cool" terminal with electrical tape since an open terminal will not be available at the "M1" or "M2" location. Thoroughly check the system after modification to ensure the proper operation of the circulating air blower in all modes of operation. Continuous-Fan Operation using "G" Energizing the"G" terminal on the furnace control provides continuous fan operation. This is done by connecting the G terminal of the thermostat to the G terminal on the furnace control. When the FAN switch is turned from auto to ON the fan will operate continuously at "HEAT" speed. EAC will be energized in this mode. NOTE: In heating, the fan will turn off during furnace ignition and warm up then restart at heating speed. Hard Wired Continuous-Fan Operation A terminal is provided on the furnace control board located in the circulatinq, air blower compartment for operation of the continu ous-fanoption.isintendedmo- Thisconnectionforthe low speed tor tap, and has a lower contact rating (8 amps) than the heat and cool taps. When the low speed blower lead is connected to this terminal, this will provide low speed blower operation whenever the other two speeds (Heat or Cool) are not energized. EAC not powered in this mode. Thoroughly check the system after modification to ensure the proper operation of the circulating air blower in all modes of operation. Separate speed selections for Heat, Cool, and 13. Furnace Maintenance FIRE...

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