How to Guide

2
IMpORTANT SAFETY INFORMATION ...................... 3
REQUIREMENTS & CODES ......................................3
Combustion Air Quality ........................................... 4
Clearances to Combustible Materials ..................... 4
Heating Load .......................................................... 4
Installation in a Garage ........................................... 5
Operation of Furnace During Construction ............. 5
COMBUSTION AIR & VENTING REQUIREMENTS ... 6
Important Information .............................................. 7
Installation in a Confined Space ............................. 7
Air From Inside ......................................................7
Outdoor Air Using a Crawl Space or
Vented Attic ........................................................... 7
Outdoor Air Using Vertical Ducts ........................... 7
Outdoor Air Using Horizontal Ducts ...................... 7
Air Directly Through an Exterior Wall ................... 8
Alternate Method of Providing Air from
Outside .................................................................. 9
Installation in an Unconfined Space ....................... 9
Category I Venting .................................................. 9
Horizontal Venting ................................................ 10
Flexible Vent Systems .......................................... 10
CIRCULATING AIR REQUIREMENTS ..................... 11
Plenums & Air Ducts ............................................. 11
Return Air Connections ......................................... 11
Upflow & Horizontal Furnaces ............................ 11
Downflow Furnaces ............................................ 12
Supply Air Connections ........................................ 12
Acoustical Treatments .......................................... 12
FURNACE INSTALLATION ...................................... 12
About the Furnace ................................................ 12
Before you Install the Furnace .............................. 12
Locating the Furnace ............................................ 13
Upflow Furnaces ................................................... 13
Horizontal Furnaces .............................................. 13
Downflow Furnaces .............................................. 14
Installation on a Concrete Slab ........................... 14
Pressure Switches ................................................ 15
Bottom Panel Removal ......................................... 15
Alternate Bottom Panel Removal ........................ 15
GAS SUppLY & pIpING ........................................... 16
Leak Check .......................................................... 16
High-Altitude Application ....................................... 17
Conversion to LP / Propane .................................. 19
ELECTRICAL wIRING .............................................. 19
Line Voltage Wiring ............................................... 19
Grounding ............................................................. 20
Thermostat / Low Voltage Connections ................ 21
Heat Anticipator .................................................. 21
Twinning ............................................................... 21
START-UP&ADJUSTMENTS .................................. 22
Pre-Start Checklist ................................................ 22
Start-Up Procedures ............................................. 22
Verifying & Adjusting Input Rate ........................... 22
Verifying & Adjusting Temperature Rise ............... 23
Verifying Burner Operation ................................... 23
Verify Operation of the Supply Air
Limit Switch ........................................................... 23
OpERATING SEQUENCE ........................................ 23
Heating Cycle ....................................................... 23
Cooling Cycle ........................................................ 23
Fan Mode .............................................................. 24
MAINTENANCE ........................................................ 24
FIGURES & TABLES ................................................ 26
Figure 18 - Furnace Dimensions ......................... 26
Airflow Data .......................................................... 27
Table 3 - Upflow / Horizontal Gas Furnaces ........ 27
Table 4 - Downflow Gas Furnaces ...................... 29
Electrical Information ............................................ 30
Figure 19 - Wiring Diagram ................................. 30
Gas Information .................................................... 31
Table 5 - Gas Flow Rates .................................... 31
Table 6 - Gas Pipe Capacities ............................. 31
Table 7 - High Altitude Deration Chart for
Propane Gas ........................................ 32
Table 8 - Natural Gas Heating Values ................. 32
Table 9 - High Altitude Deration Chart for
Nat. Gas - High Heating Values ............ 33
Table 10 - High Altitude Deration Chart for
Nat. Gas - Low Heating Values ........... 33
Troubleshooting .................................................... 34
Table 11 - Control Board Fault Conditions .......... 34
Furnace Components ........................................... 34
Figure 20 - Component Locations ....................... 35
INSTALLATION / pERFORMANCE CHECKLIST .... 36
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