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TABLE OF CONTENTS
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
Verifying & Adjusting Firing Rate ................................... 15
Manifold Pressure Adjustment ....................................... 15
Verifying Over-Temperature Limit Control Operation .... 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 &
Temperature Rises (° F) .............................. 20
Table 6. Nominal Cooling Airflow Rates &
Temperature Rises (° F) .............................. 21
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
Unit with ECM Motor ................................. 24
Table 9. Electrical Data. ............................................. 25
REFRIGERANT CHARGING ........................................... 25
Application Notes & Charging Charts ............................ 25
Refrigerant Charging Tables (Cooling Mode Only) ....... 26
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 .......................................... 32
REPLACEMENT PARTS ................................................. 32
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