FURNACES TABLE OF CONTENTS
RECOMMENDED TOOLS AND EQUIPMENT .......................................................................................... 4
AFS SERIES MODEL IDENTIFICATION .................................................................................................. 5
REQUIRED DUCTING ........................................................................................................................................................... 5
DISCHARGE AND DUCTING ............................................................................................................................................... 6
AFS Wiring ............................................................................................................................................................................ 6
AFM SERIES MODEL IDENTIFICATION.................................................................................................. 7
REQUIRED DUCTING ........................................................................................................................................................... 7
REQUIRED DISCHARGE ..................................................................................................................................................... 7
AFM Wiring ........................................................................................................................................................................... 8
AFL SERIES MODEL IDENTIFICATION .................................................................................................. 9
REQUIRED DUCTING ........................................................................................................................................................... 9
REQUIRED DISCHARGE ................................................................................................................................................... 10
AFL Wiring .......................................................................................................................................................................... 10
79 / 80 SERIES MODEL IDENTIFICATION ............................................................................................ 12
DUCTING CONFIGURATIONS ........................................................................................................................................... 13
79 / 80 SERIES Directionnel Louver Insert (PN 36959) .................................................................................................. 13
Wiring Diagrams 7900 & 8012 Models ............................................................................................................................. 13
8500 SERIES Model Identification .................................................................................................................................... 15
Wiring Diagrams 8500 Models .......................................................................................................................................... 16
8900 SERIES MODEL IDENTIFICATION ............................................................................................... 20
Wiring Diagrams 8900 Models .......................................................................................................................................... 20
85 / 89 2-STAGE SERIES MODEL IDENTIFICATION ............................................................................ 23
Wiring Diagrams 2-Stage Models ..................................................................................................................................... 24
Fig 1 2-STAGE with Field Plug.......................................................................................................................................... 24
Fig 2 2-STAGE without Field Plug .................................................................................................................................... 24
MODEL HFH 2000 BI METAL THERMOSTAT ....................................................................................... 25
INSTALLATION & OPERATION......................................................................................................................................... 25
DIGITAL THERMOSTAT MODEL 1H2C ................................................................................................. 27
Specifications ..................................................................................................................................................................... 27
WIRING REQUIREMENTS FOR ATWOOD THERMOSTAT ............................................................................................. 28
DIGITAL THERMOSTAT MODEL 2H2C TWO STAGE .......................................................................... 29
Specifications ..................................................................................................................................................................... 29
WIRING REQUIREMENTS FOR ATWOOD (ONLY) TWO STAGE THERMOSTAT......................................................... 29
SEQUENCE OF OPERATION – DC MODELS (STANDARD UNITS) .................................................... 30
SEQUENCE OF OPERATION – DC MODELS (2- STAGE EXCALIBUR™ FURNACES ONLY) .......... 32
SEQUENCE OF OPERATION – PILOT MODELS .................................................................................. 33
SEQUENCE OF OPERATION – AC MODELS ....................................................................................... 34
CRITICAL INSTALLATION CRITERIA ................................................................................................... 35
ANNUAL PREVENTATIVE MAINTENANCE INSPECTION ................................................................... 35
MECHANICAL THERMOSTAT ............................................................................................................... 36
CIRCUIT BREAKER & MOTOR .............................................................................................................. 37
CIRCUIT BOARDS .................................................................................................................................. 38
RELAY ..................................................................................................................................................... 38
SAIL SWITCH .......................................................................................................................................... 39
LIMIT SWITCH ........................................................................................................................................ 39
DUAL SOLENOID GAS VALVE .............................................................................................................. 39
BURNER HEAD, ELECTRODE AND VALVE ASSEMBLY .................................................................... 40
#4- RETURN AIR ..................................................................................................................................... 42
TROUBLE SHOOTING GUIDES ............................................................................................................. 42
Mechanical Thermostat ..................................................................................................................................................... 42
Furnace – Electronic Ignition Models .............................................................................................................................. 43
Furnace – Electronic Ignition Models (continued) ......................................................................................................... 44
Furnace – Electronic Ignition Models (continued) ......................................................................................................... 45
FURNACE TERMINOLOGY ................................................................................................................................................ 46
FLAT RATE SCHEDULE ........................................................................................................................ 48
8500-IV LD & 2-STAGE SERIES FURNACE PARTS ............................................................................. 62
8900-IV DC & AC - LD & 2-STAGE SERIES FURNACE ARTS ............................................................. 67
WARRANTY ............................................................................................................................................ 71
FURNACE EXTENDED SERVICE CONTRACT ..................................................................................... 71
TERM AND PROVISIONS: ................................................................................................................................................. 71
EXCLUSIONS (SPECIFICALLY EXCLUDED FROM THE WARRANTIES) ..................................................................... 71
LIMITATIONS ...................................................................................................................................................................... 71