Grounding ............................................................23
Twinning ...............................................................23
Limit Switch ............................................................24
Heating Cycle ........................................................25
Cooling Cycle .........................................................25
Fan Mode ...............................................................25
MAINTENANCE .........................................................25
Air Filters ................................................................25
Lubrication .............................................................26
Vent System ...........................................................26
Table 3 - Minimum Clearances to Combustible
Materials .............................................27
Figure 22 - Upfl ow/Horizontal Furnaces ............28
Figure 23 - Downfl ow Furnaces.........................29
Airfl ow Data............................................................30
Table 4 - Upfl ow/Horizontal Models ....................30
Table 5 - Downfl ow Models ................................32
Table 6 - Wire length and Voltage Specs ............33
Table 7 - Control Board Fault Codes ..................33
Table 8 - Gas Flow Rates ...................................35
Table 9 - Gas Pipe Capacities ............................35
Table 10 - High Altitude Deration Chart for
Table 11 - Natural Gas Heating Values ..............36
Table 12 - High Altitude Deration Chart for
Nat. Gas - High Heating Values .........37
Table 13 - High Altitude Deration Chart for
Nat. Gas - Low Heating Values ..........37
Table 14 - Vent Termination Clearances .............38
Figure 25 - Upfl ow Options .................................39
Figure 26 - Horizontal Options - 1 Pipe
Furnaces ..........................................40
Figure 27 - Horizontal Options - 2-pipe
Furnaces ..........................................41
Figure 28 - Downfl ow Options ............................42
Figure 29 - Horizontal and Vertical Venting ........43
Table 15 - Vent Pipe Lengths .............................44
Accessories ...........................................................45
Figure 31 - Finish Flanges .................................45
Figure 32 - Rubber Grommets...........................45
Figure 33 - PVC TEE, Reducer & Hose Barb .....45
Figure 34 - Upfl ow/Horizontal Gas Furnace
Components.....................................46
Figure 35 - Downfl ow Gas Furnace
Components ....................................46
3