3
Autostaging for Single Stage Thermostats .............24
Autostaging
for
Two-Stage
Thermostats
.................25
Dehumidifi
cation
Options
........................................25
Line
Voltage
Wiring
.................................................25
Low
Voltage
Wiring
.................................................25
Grounding
...............................................................25
Twinning
..................................................................26
START-UP & ADJUSTMENTS ...................................27
Pre-Start
Checklist..................................................27
Start-Up
Procedures
...............................................27
Verifying and Adjusting Input Rate .........................27
Verifying and Adjusting Temperature Rise ..............28
Verifying Burner Operation .....................................28
Verifying Operation of the Supply Air
Limit
Switch
............................................................28
OPERATING SEQUENCE .........................................28
Heating
Cycle
.........................................................28
Cooling
Cycle
.........................................................29
Fan
Mode
................................................................29
TROUBLESHOOTING ...............................................29
DESCRIPTION OF COMPONENTS ..........................30
MAINTENANCE .........................................................30
Air Filters ................................................................30
Blower
Compartment
..............................................30
Cleaning of Burners ................................................31
Heat Exchanger and Burner Maintenance .............31
Lubrication ..............................................................31
Vent
System
...........................................................31
FRENCH TRANSLATIONS ........................................32
FIGURES AND TABLES ............................................34
Figure 28 - Furnace Dimensions ........................34
Airfl
ow
Data
...........................................................35
Table 8 - Heating/Cooling Airfl ows and
Temperature Rises - Fixed Speed .......35
Table 9 - Nominal CFM and Temperature Rises -
Variable
Speed
.....................................36
Table 10 - Nominal Cooling/Heat Pump CFM -
Variable
Speed
.....................................37
Gas Information .....................................................38
Table 11 - Gas Flow Rates .................................38
Table 12 - Gas Pipe Capacities ..........................38
Table 13 - High Altitude Deration Chart for
Propane
Gas
.....................................39
Table 14 - Natural Gas Heating Values ..............39
Table 15 - High Altitude Deration Chart for
Nat. Gas - High Heating Value ...........40
Table 16 - High Altitude Deration Chart for
Nat. Gas - Low Heating Value ...........40
Electrical
Information
.............................................41
Figure 29 - Two-Stage Fixed Speed Motor
Control
Board
....................................41
Figure 30 - Two-Stage Variable Speed
Motor Control Board ..........................41
Figure 31 - Two-Stage Furnace Control Board ....41
Figure 32 - Wiring Diagram - Two Stage Fixed
Speed Upfl ow/Horiz. Furnaces .........42
Figure 33 - Wiring Diagram - Two Stage Fixed
Speed
Downfl ow Furnaces ...............43
Figure 34 - Wiring Diagram - Two Stage Variable
Speed Upfl ow/Horiz. Furnaces .........44
Figure 35 - Wiring Diagram - Two Stage Variable
Speed
Downfl ow Furnaces ...............45
Venting
Information
.................................................46
Table 17 - Vent Termination Clearances .............46
Figure 36 - Horizontal and Vertical Venting ........47
Figure 37 - Upfl ow Options .................................48
Figure 38 - Horizontal Options ..........................49
Figure 39 - Downfl ow Options ............................50
Location of Furnace Components .........................51
Figure 40 - Upfl ow/Horizontal Gas Furnace
Components
....................................51
Figure 41 - Downfl ow Gas Furnace
Components
....................................51
INSTALLATION/PERFORMANCE CHECKLIST .......52
