Page 1
02/11
*2P0211*
506719−01
*P506719-01*
P.O. Box 799900, Dallas, TX 75379−9900
INSTALLATION INSTRUCTIONS
80AF1DF
Downflow Warm Air Gas Furnaces
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in
manuals, be alert to the potential for personal injury or death.
This manual must be left with the homeowner for future reference.
CAUTION
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
TABLE OF CONTENTS
Unit Dimensions
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangement
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
80AF1DF Gas Furnace
4
. . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List
4
. . . . . . . . . . . . . . . . . . . . . . . .
Safety Information
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Use of Furnace as a Construction Heater
5
. . . . . . . . . . .
General
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combustion, Dilution & Ventilation Air
6
. . . . . . . . . . . . . .
Setting Equipment
9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filters
12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct System
12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Venting
13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Piping
20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical
22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Integrated Control
25
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Start−Up
26
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Pressure Adjustment
27
. . . . . . . . . . . . . . . . . . . . . . . .
High Altitude
27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Proper Combustion
27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other Unit Adjustments
28
. . . . . . . . . . . . . . . . . . . . . . . . . .
Service
29
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Planned Service
32
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Parts List
33
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start−Up and Performance Checklist
34
. . . . . . . . . . . . . . .
02/11 Supersedes 01/11
