2
TABLE OF CONTENTS
IMPORTANT SAFETY INFORMATION .............................. 3
REQUIREMENTS & CODES ..............................................4
Combustion Air Quality....................................................5
Heating Load ...................................................................5
Installation in a Garage....................................................5
Clearances to Combustible Materials .............................6
Operation of Furnace During Construction .....................6
COMBUSTION AIR & VENTING REQUIREMENTS ..........7
Direct Vent Systems ........................................................8
Conventional Vent Systems - Confined Spaces ..............8
Air From Inside .............................................................. 8
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 ..........10
Category IV Venting .........................................................10
Vent Pipe Material ......................................................... 11
Vent Pipe Length & Diameter ........................................11
Vent Pipe Installation ....................................................11
Outdoor Terminations - Horizontal Venting ...................12
Outdoor Terminations - Vertical Venting .......................13
Vent Freezing Protection ...............................................13
Existing Installations ......................................................13
Condensate Disposal ......................................................13
CIRCULATING AIR REQUIREMENTS ............................... 14
Plenums & Air Ducts ........................................................14
Return Air Connections ...................................................14
Upflow & Horizontal Furnaces ....................................... 14
Downflow Furnaces .......................................................15
Supply Air Connections ...................................................15
Acoustical Treatments .....................................................15
FURNACE INSTALLATION ................................................ 15
General Requirements ....................................................15
Upflow Furnaces .............................................................. 15
Horizontal Furnaces ........................................................15
Downflow Furnaces .........................................................16
Installation on a concrete slab .......................................16
Inducer & Venting Options ...............................................16
Inducer Assembly Rotation ...........................................17
Pressure Switch Tubing ................................................17
Accessories .....................................................................17
Finish Flange .................................................................17
Rubber Grommets .........................................................18
PVC Components .........................................................18
Typical Orientation .................................................18
Alternate Orientation ..............................................18
Condensate Drain Lines ................................................19
Bottom Panel Removal ....................................................19
Alternate Bottom Panel Removal ..................................19
GAS SUPPLY & PIPING .....................................................20
Leak Check ...................................................................... 22
High Altitude Application (Natural Gas Only) ..................22
Converting from Natural Gas to LP / Propane .................23
ELECTRICAL WIRING .......................................................23
Line Voltage Wiring..........................................................23
Grounding ........................................................................24
Thermostat / Low Voltage Connections ..........................24
Single Stage AC & Two Stage Thermostat ...................25
Two-Stage AC & Two-Stage Thermostat ......................25
Autostaging for Single Stage Thermostats ......................25
Autostaging for Two-Stage Thermostats .........................26
Blower Speed Configuration ............................................26
Fixed Speed Blower Applications ..................................26
Variable Speed Blower Applications .............................26
Dehumidification Options ................................................26
START-UP & ADJUSTMENTS ...........................................27
Pre-Start Check List ........................................................27
Start-up Procedures ........................................................27
Verifying & Adjusting Input Rate ...................................... 27
Verifying & Adjusting Temperature Rise ..........................27
Heat Anticipator ...............................................................27
Verifying Burner Operation ..............................................28
Verifying Operation of the Supply Air Limit Switch .......... 28
OPERATING SEQUENCE ..................................................29
Heating Cycle ..................................................................29
Cooling Cycle ..................................................................29
Fan Mode .........................................................................29
MAINTENANCE ..................................................................29
FIGURES & TABLES ..........................................................31
Figure 28. *TC & *TL Cabinet Dimensions .................... 31
Airflow Data .....................................................................32
Table 6. *TC / *TL Heating / Cooling Airflows (CFM)
& Temperature Rises (°F) ................................32
Table 7. *TC / *TL Nominal Heating Airflows
(CFM) & Temperature Rises (° F) for Variable
Speed Furnaces ...............................................34
Table 8. *TC / *TL Nominal Cooling / Heat Pump
Airflows (CFM)for Variable Speed Furnaces ...35
Gas Information ...............................................................36
Table 9. Gas Flow Rates ...............................................36
Table 10. Gas Pipe Capacities ......................................36
Table 11. High Altitude Deration - Propane Gas ...........37
Table 12. Natural Gas Heating Values ..........................37
Table 13. High Altitude Deration - Natural Gas with
HIGH Heating Value ......................................38
Table 14. High Altitude Deration - Natural Gas with
LOW Heating Value .......................................38
Electrical Information .......................................................39
Figure 29. Two-Stage Fixed Speed Motor Control
Board ............................................................39
Figure 31. Two-Stage Furnace Control Board ..............39
Figure 30. Two-Stage Variable Speed
Motor Control Board .....................................39
Figure 32. Wiring Diagram for Two-Stage, Fixed
Speed Upflow Furnaces ...............................40
Figure 33. Wiring Diagram for Two-Stage, Fixed
Speed Downflow Furnaces ..........................41
Figure 34. Wiring Diagram for Two-Stage, Variable
Speed Upflow Furnaces ...............................42
Figure 35. Wiring Diagram for Two-Stage, Variable
Speed Downflow Furnaces ..........................43