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IMPORTANT SAFETY INFORMATION .............................. 3
REQUIREMENTS & CODES .............................................. 3
Combustion Air Quality ..................................................... 4
Heating Load .................................................................... 5
Installation in a Garage .................................................... 5
Clearances to Combustible Materials ............................... 5
Operation of Furnace During Construction ....................... 5
COMBUSTION AIR & VENTING REQUIREMENTS .......... 6
Direct Vent Furnaces ........................................................ 7
Conventional Vent Systems - Confined Spaces ............... 7
Air From Inside ............................................................. 7
Outdoor Air from a Crawl Space or Vented Attic .......... 8
Outdoor Air Using Vertical Ducts .................................. 8
Outdoor Air Using Horizontal Ducts ............................. 8
Air Directly Through An Exterior Wall ........................... 9
Alternate Method of Providing Air from Outside ........... 9
Conventional Vent Systems - Unconfined Spaces ........... 9
Category IV Venting ......................................................... 9
Vent Pipe Material ........................................................ 10
Vent Pipe Length & Diameter ....................................... 10
Vent Pipe Installation .................................................... 10
Outdoor Terminations - Horizontal Venting .................. 11
Outdoor Terminations - Vertical Venting ...................... 12
Vent Freezing Protection .............................................. 12
Existing Installations ..................................................... 12
Condensate Disposal ....................................................... 12
CIRCULATING AIR REQUIREMENTS ............................... 13
Plenums & Air Ducts ........................................................ 13
Return Air Connections .................................................... 13
Upflow & Horizontal Furnaces ...................................... 13
Downflow Furnaces ...................................................... 14
Supply Air Connections .................................................... 14
Acoustical Treatments ...................................................... 14
FURNACE INSTALLATION ................................................ 14
General Requirements ..................................................... 14
Upflow Furnaces .............................................................. 14
Horizontal Furnaces ......................................................... 14
Downflow Furnaces .......................................................... 15
Installation on a Concrete Slab .................................... 15
Inducer & Venting Options ............................................... 15
Inducer Assembly Rotation .......................................... 16
Pressure Switch Tubing ............................................... 16
Alternate Pressure Switch Location ............................. 17
Accessories ...................................................................... 17
Finish Flange ................................................................ 17
Rubber Grommets ........................................................ 17
PVC Components ......................................................... 18
Typical Orientation ................................................... 18
Alternate Orientation ................................................ 18
Optional PVC Pipe Installation ..................................... 18
Condensate Drain Lines ............................................... 18
Bottom Panel Removal ..................................................... 19
Alternate Bottom Panel Removal ..................................... 19
GAS SUPPLY & PIPING ..................................................... 20
Leak Check ...................................................................... 20
High Altitude Application (Natural Gas Only) ................... 20
Converting from Natural Gas to LP / Propane .................. 22
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TABLE OF CONTENTS
ELECTRICAL WIRING ....................................................... 23
Line Voltage Wiring .......................................................... 23
Grounding ......................................................................... 23
Thermostat / Low Voltage Connections ........................... 24
Twinning ........................................................................... 24
One stage heating ........................................................ 24
Two stage heating ........................................................ 25
Heat Anticipator ................................................................ 25
START-UP & ADJUSTMENTS ........................................... 25
Pre-Start Check List ......................................................... 25
Start-up Procedures ......................................................... 25
Verifying & Adjusting Input Rate ....................................... 25
Verifying & Adjusting Temperature Rise .......................... 26
Verifying Burner Operation ............................................... 26
Verifying Operation of the Supply Air Limit Switch ........... 26
System Operation ............................................................. 26
(Gas) Heating Mode ..................................................... 26
Cooling Mode ............................................................... 26
Manual Fan .................................................................. 26
Fault Conditions ............................................................... 27
OPERATING SEQUENCE .................................................. 27
Heating Cycle ................................................................... 27
Cooling Cycle ................................................................... 27
Fan Mode ......................................................................... 27
MAINTENANCE .................................................................. 27
FIGURES & TABLES .......................................................... 29
Figure 29. J951X*U Cabinet Dimensions ..................... 29
Figure 30. J951X*D Cabinet Dimensions ..................... 29
Figure 31. Wiring Diagram ........................................... 30
Figure 32. Ladder Diagram .......................................... 31
Table 6. Gas Flow Rates .............................................. 32
Table 7. Gas Pipe Capacities ....................................... 32
Table 8. High Altitude Deration - Propane Gas ........... 33
Table 9. Natural Gas Heating Values ........................... 33
Table 10. High Altitude Deration - Natural Gas with
Table 11. High Altitude Deration - Natural Gas with
Table 12. Vent Termination Clearances ....................... 35
Figure 33. Horizontal & Vertical Venting ...................... 36
Figure 34. Venting Options for Upflow Installations
Figure 35. Venting Options for Horizontal Installations
Figure 36. Venting Options for Downflow Installations
TROUBLESHOOTING ........................................................ 40
Table 13. Control Board Fault Conditions .................... 40
FURNACE COMPONENTS ................................................ 40
Table 14. Motor Control Board Fault Conditions .......... 40
Figure 37. J951X*U Component Locations .................. 41
Figure 38. J951X*D Component Locations .................. 41
INSTALLATION CHECKLIST ............................................. 44
HIGH Heating Value .................................... 34
LOW Heating Value ..................................... 34
(J951X*U Series) ........................................ 37
(J951X*U Series) ........................................ 38
(J951X*D Series) ........................................ 39
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