Table of Contents
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IMPORTANT SAFETY INFORMATION ........................... 3
REQUIREMENTS & CODES ........................................... 4
GENERAL INFORMATION .............................................. 5
Before you install this unit .............................................. 5
Locating the Equipment ................................................. 5
Heating Load ................................................................. 5
COMBUSTION AIR & VENTING REQUIREMENTS ....... 6
General Information ....................................................... 7
Vent Termination ........................................................... 7
CIRCULATING AIR SUPPLY .......................................... 8
Air Ducts .................................................................... 8
Air Filter Requirements .............................................. 8
Unconditioned Spaces ............................................... 9
Acoustical Duct Work ................................................. 9
UNIT INSTALLATION ...................................................... 9
Packaging Removal ....................................................... 9
Rigging & Hoisting ......................................................... 9
Clearances to Combustible Materials ............................ 9
Rooftop .......................................................................... 9
Ground Level ................................................................. 9
Horizontal to Downflow Conversion ............................... 9
Condensate Drain .......................................................... 9
ELECTRICAL WIRING .................................................... 10
Pre-Electrical Checklist .................................................. 11
Grounding ...................................................................... 11
Line Voltage ................................................................... 11
Thermostat / Low Voltage Connections ......................... 11
Checking Heat Anticipator Settings ........................... 11
Blower Speed ................................................................ 12
5-Speed ECM Motor .................................................. 12
Optional Furnace Control Board Connections ............... 12
Electronic Air Cleaner ................................................ 12
Humidifier ................................................................... 12
GAS SUPPLY & PIPING .................................................. 12
Leak Check .................................................................... 13
High Altitude Conversion - Natural Gas ......................... 13
START UP & ADJUSTMENTS ........................................ 14
Pre-Start Check List ...................................................... 14
Start-Up Procedure ........................................................ 14
Air Circulation ............................................................. 14
System Cooling .......................................................... 14
System Heating .......................................................... 14
Verifying & Adjusting Temperature Rise ........................ 14
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TABLE OF CONTENTS
Verifying & Adjusting Firing Rate ................................... 15
Manifold Pressure Adjustment ....................................... 15
Verifying Burner Operation ............................................ 15
Verify Operation of the Supply Air Limit Switch ............. 15
OPERATING SEQUENCE ............................................... 16
Heating Cycle ................................................................ 16
Cooling Cycle ................................................................ 16
Fan Mode ...................................................................... 16
EQUIPMENT MAINTENANCE ......................................... 16
TROUBLESHOOTING ..................................................... 18
FIGURES & TABLES ....................................................... 19
Figure 10. Unit Dimensions ........................................ 19
Table 4. Center of Gravity & Unit Shipping Weights .. 19
Airflow Data ................................................................... 20
Table 5. Nominal Heating Airflow Rates &
Table 6. Nominal Cooling Airflow Rates &
Gas Information ............................................................. 22
Table 7. Gas Pipe Capaacities .................................. 22
Table 8. Gas Flow Rates ........................................... 22
Figure 11. Gas Valve Label ....................................... 23
Wiring Diagram & Electrical Data .................................. 24
Figure 12. Wiring Diagram for 230V / 60 Hz
Table 9. Electrical Data. ............................................. 25
REFRIGERANT CHARGING ........................................... 25
Application Notes & Charging Charts ............................ 25
Table 10. Charging Table for 2 Ton Models .............. 26
Table 11. Charging Table for 2.5 Ton Models ........... 26
Table 12. Charging Table for 3 Ton Models .............. 27
Table 13. Charging Table for 3.5 Ton Models ........... 27
Table 14. Charging Table for 4 Ton Models .............. 28
Figure 13. Charging Chart for 5 Ton Models ............. 28
FURNACE COMPONENTS ............................................. 29
Figure 14. Component Locations ............................... 29
INSTALLATION CHECKLIST .......................................... 30
REPLACEMENT PARTS ................................................. 30
Temperature Rises (° F) .............................. 20
Temperature Rises (° F) .............................. 21
Unit with ECM Motor ................................. 24
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