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Atwood AFS Series Training Manual

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Effective 1/15
Part Number 30620

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  Summary of Contents for Atwood AFS Series

  • Page 1 Effective 1/15 Part Number 30620...
  • Page 2 Atwood products is our website: www.atwoodmobile.com. At our website brochures may be downloaded, troubleshooting guides reviewed and the latest information bulletins can be read. In addition, all Atwood Authorized Service Centers are listed on our site, accessible via an easy-to-use search system.
  • Page 3: Table Of Contents

    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 –...
  • Page 4: Recommended Tools And Equipment

    Disclaimer: The data presented in this publication is obtained from the most reliable sources, and is believed to be authentic as of the date of publication. Responsibility for typographical errors or omission of data cannot be assumed by the publishers. Recommended Tools and Equipment U-Tube Manometer –...
  • Page 5: Afs Series Model Identification

    Leak Test Solution – A solution that bubbles when applied to gas fittings or connections showing where a gas leak is present. AFS Series Model Identification Applications – This unit is typical installed in a tent camper, truck camper and small travel trailers due to its small size and lower BTU capacities.
  • Page 6: Discharge And Ducting

     Horizontal or Vertical 4” Ducting; when using 4” ducting one duct from each side must be used. Unless the front discharge is used with either the 5” duct and grill or optional 4” ducting.  ‘No Bottom Discharge system allowed”. DISCHARGE AND DUCTING Model Required Discharge Area...
  • Page 7: Afm Series Model Identification

    AFM Series Model Identification Applications – This unit is typically installed in travel trailers, 5 wheels and motor homes. Installation – This series of furnace can be installed either vertically or horizontally. If installed vertically, the exhaust port must be located at the bottom. Extra care must also be given in sealing this type of installation. Consult the installation manual for details.
  • Page 8: Afm Wiring

    Horizontal Bottom 4 x 10 4 x 10 4 x 10 Vertical Bottom 5 x 9-3/4 5 x 9-3/4 5 x 9-3/4 AFM Wiring...
  • Page 9: Afl Series Model Identification

    AFL Series Model Identification Applications – This unit is typically installed in travel trailers, 5 wheels and motor homes. Installation – This series of furnace can be installed either vertically or horizontally. If installed vertically, the exhaust port must be located at the bottom. Extra care must also be given in sealing this type of installation. Consult the installation manual for details.
  • Page 10: Required Discharge

    REQUIRED DISCHARGE Models Required Discharge Area 36 in (35)(40) Horizontal 48 in Bottom Vertical 48 in Bottom System AFLD35 AFLD40 AFLA35 AFLA40 4” Duct Bottom Vertical Bottom AFL Wiring...
  • Page 12: 79 / 80 Series Model Identification

    79 / 80 SERIES Model Identification 79/80 Series Model Identification MODEL DESCRIPTION 12=7900 Series 80=8012 Series BTU/Hr Rate (input) 7912=12,000 16=16,000 20=20,000 8012=12,000 Voltage DC Gas Type LP=Propane Gas Connection 6=3/8" Flare Vent Options A= Vent Length 4" approx. B= Vent Length 8" approx. C=Vent Length 12"...
  • Page 13: Ducting Configurations

    DUCTING CONFIGURATIONS 79 / 80 SERIES Directionnel Louver Insert (PN 36959) A directional louver grill is available for all models. This grill has fins that are set at a 55° degree angle. This will allow you to direct the heat fore or aft in the camper. 1- Remove the front grill of the furnace.
  • Page 14 LIMIT SWITCH N.C. VALVE SAIL SWITCH N.O. THERMOSTAT VALVE MOTOR IGNITION CONTROL FIELD SUPPLIED WIRING ON/OFF SWITCH IGNITION CONTROL LIMIT SWITCH N.C. ELECTRODE SAIL SWITCH CODE COLOR ORANGE SWITCH/BREAKER BLACK BROWN MOTOR BLUE YELLOW GREEN WHITE ELECTRODE 12 VOLTS DC ALL WIRES ARE 18 AWG UNLESS OTHERWISE SPECIFIED 16/30 200°C RADIX (SIL-A-BLEND) 18 AWG WIRE...
  • Page 15: 8500 Series Model Identification

    LIMIT SWITCH N.C. VALVE SAIL SWITCH N.O. THERMOSTAT VALVE MOTOR IGNITION CONTROL FIELD SUPPLIED WIRING ON/OFF SWITCH IGNITION CONTROL LIMIT SWITCH N.C. ELECTRODE SAIL SWITCH CODE COLOR ORANGE SWITCH/BREAKER BLACK MOTOR BROWN BLUE ELECTRODE YELLOW GREEN WHITE 12 VOLTS DC ALL WIRES ARE 18 AWG UNLESS OTHERWISE SPECIFIED NOTE: IF ANY OF THE ORIGINAL WIRES AS SUPPLIED CAUTION...
  • Page 16: Wiring Diagrams 8500 Models

    Applications – This unit is typically installed in travel trailers, 5 wheels and motor homes. Installation – This series of furnace can be installed either vertically or horizontally. If installed vertically, the exhaust port must be located at the bottom. Extra care must also be given in sealing this type of installation. Consult the installation manual for details.
  • Page 17 Figure 2 85-II Wiring Remote Sense Figure 3 85-III Wiring Remote Sense...
  • Page 18 Figure 4 85-III Wiring Local Sense Figure 5 85-IV Wiring Blower Control with Field Plug...
  • Page 19 Figure 6 85-IV Wiring Blower Control with Field Plug Figure 7 85-IV Wiring Blower Control without Field Plug...
  • Page 20: 8900 Series Model Identification

    8900 SERIES Model Identification 8900 Series Model Identification MODEL DESCRIPTION 89 Series BTU/Hr Rate (input) 35=34,000 40=40,000 Voltage DC= 12 Volt AC=120 Volt Gas Type LP=Propane LP/NAT=Propane Natural Gas Gas Connection 6=3/8" Flare Thermostat W=with W/O= with out Applications – This unit is typically installed in travel trailers, 5 wheels and motor homes.
  • Page 21 Fig 1 89-II DC Wiring Local Sense Fig 2 89-II AC Wiring Local Sense...
  • Page 22 Fig 3 89-III AC Wiring Local Sense Fig 4 89-III DC Wiring Local Sense...
  • Page 23: 85 / 89 2-Stage Series Model Identification

    85 / 89 2-Stage SERIES Model Identification 85 / 89 Series Two Stage Model Identification 1522 1522 DC LP MODEL DESCRIPTION 1522 2334 2540 BTU/Hr Rate (input) 1522= 15,000 low 22=22,000 high 23=23,000 low 34=24,000 high 25=25,000 low 40=40,000 high Voltage DC Gas Type LP=Propane...
  • Page 24: Wiring Diagrams 2-Stage Models

    Wiring Diagrams 2-Stage Models Fig 1 2-STAGE with Field Plug Fig 2 2-STAGE without Field Plug...
  • Page 25: Model Hfh 2000 Bi Metal Thermostat

    Model HFH 2000 Bi Metal Thermostat WARNING PRODUCT DAMAGE  Disconnect electricity to the appliance before installation or service. Reconnect then through.  DO NOT short control terminals at appliance t test system. The room thermostat will be damaged  DO NOT locate thermostat in a humid area. The life expectancy will be reduced. ...
  • Page 26 WARNING MERCURY – HAZARDOUS WASTE Some old thermostat may contain mercury. Handle with care. Dispose of properly. Tools required Wire stripper or knife, drill with 1/16” bit, screwdriver, level and a pencil. Removing Old Thermostat Please read all instruction carefully. Disconnect electricity and turn off gas to the heater.
  • Page 27: Digital Thermostat Model 1H2C

    DIGITAL THERMOSTAT MODEL 1H2C This thermostat has been designed to operate standard air conditioning units in conjunction with a RV furnace. Specifications SCROLL OPERATIN SLIDE SWITCH ORDER OF DISPLAYED LEFT RIGHT MODES Furnace Operation ● Furnace cycles to satisfy set point.
  • Page 28: Wiring Requirements For Atwood Thermostat

    Separate the thermostat body from the sub-base by gently squeezing the top and bottom, connecting wiring per requirements. Attach thermostat sub-base to the wall at desired mounting location. WIRING REQUIREMENTS FOR ATWOOD THERMOSTAT 12 VDC ANALOG A/C SYSTEMS (RVP®) 7.5 VDC ANALOG A/C SYSTEMS (DOMETIC®)
  • Page 29: Digital Thermostat Model 2H2C Two Stage

    DIGITAL THERMOSTAT MODEL 2H2C Two Stage This thermostat has been designed to operate standard air conditioning units in conjunction with an Atwood (only) Two Stage RV furnace. Specifications Operating Voltage 9 VDC to 18 VDC Current Consumption at 12 VDC...
  • Page 30: Sequence Of Operation - Dc Models (Standard Units)

    Sequence of Operation – DC Models (Standard Units) The ON/OFF switch allows power to pass to the circuit breaker WARNING and the thermostat.  FURNACE PRODUCES HIGH TEMPERATURE The thermostat controls the operating circuit to the furnace by reacting to room temperature. When room temperature is below ...
  • Page 31 Steady ON no Flashing Internal Control Failure...
  • Page 32: Sequence Of Operation - Dc Models (2- Stage Excaliburâ„¢ Furnaces Only)

    Sequence of Operation – DC Models (2- Stage Excalibur™ Furnaces ONLY) The digital thermostat controls the operating circuit to the furnace by reacting to room temperature. When the room temperature is below the thermostat set point by 2°F a heat demand signal will be sent to the controller module).
  • Page 33: Sequence Of Operation - Pilot Models

    Sequence of Operation – Pilot Models Thermostat The thermostat controls the operating circuit to the furnace by reacting to room temperature to open and close a set of contact points which allow current to flow to the relay.  The relay receives the current and allows current to pass through to the circuit breaker by closing a switch within the relay.
  • Page 34: Sequence Of Operation - Ac Models

    Sequence of Operation – AC Models Operating Circuitry 24 VAC The transformer receives 120 VAC which it converts to 24VAC for the operating circuitry.  The thermostat controls the operating circuit to the furnace by Operating Circuitry 24 VAC Motor Circuitry 120 VAC reacting to room temperature When room temperature is below (Older Models) the thermostat set point, the contacts close to allow current to flow...
  • Page 35: Critical Installation Criteria

    Critical Installation Criteria WARNING CRITICAL INSTALLATION CRITERIA  Do not install the furnace on material that restricts return air, such as carpet, or any soft material, such as vinyl.  Do not install furnace where clearance to combustibles cannot be maintained. ...
  • Page 36: Mechanical Thermostat

    WARNING  Label all wires prior to disconnection when servicing. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing. AIR WHEEL The air wheel should be clean and clear of obstructions. GASKETS Starting the furnace with something in the blower will Inspect all gaskets for tight seals.
  • Page 37: Circuit Breaker & Motor

    It is very important that the correct motor be used for each model of furnace, to identify the correct motor. Older models have “PF” embossed in the metal housing along with a part number. New model have sticker giving the correct Atwood part number. A cross reference service parts list is given in the end of this book.
  • Page 38: Circuit Boards

    Circuit Boards The circuit board has three functions: create a spark, open the gas valve and lock-out when one of the prior two functions, do not occur during the ignition cycle. As long as the circuit board is receiving the minimum micro-amps from the electrode assembly, it will not lock out.
  • Page 39: Sail Switch

    Sail Switch The sail switch is an air proving device. It is used as a safety component that will not let ignition occur until it sees air produced from the motor wheel. It insures that the combustion wheel is rotating fast enough so that there is a proper air for gas mixture for smooth ignition.
  • Page 40: Burner Head, Electrode And Valve Assembly

    Burner Head, Electrode and Valve Assembly The burner head, electrode and gas valve on the late model 79 series furnaces are individually accessible. However, to service these same components on the late model 85 and 89 series, remove the complete assembly. The different models and /or BTU ranges of furnaces use different burner heads.
  • Page 41 % Full +20°F 0°F -5°F -10°F -15°F 36,000 18,000 12,750 8,500 4,250 32,400 16,200 12,150 8,100 4,050 28,800 14,400 11,400 7,600 3,800 25,200 12,600 10,450 7,300 3,150 21,600 10,800 8,100 5,400 2,700 16,200 8,100 6,075 4,050 2,025 65 lb. Under Mount LP Gas Tank BTU available at % Full +20°F 0°F...
  • Page 42: 4- Return Air

    Trouble Shooting Guides Guides are only intended for use on Atwood® products by service technicians who have successfully completed Atwood® training. This guide should be used in conjunction with the appropriate Instruction Manual provided with the product and any applicable Industry Standards. This is 1-866-869-3118 not intended to be a complete list.
  • Page 43: Furnace - Electronic Ignition Models

    BURNER FAILS TO IGNITE AND - BLOWER FAILS TO RUN No electrical power to the furnace Reconnect or replace power source. * Thermostat defective Replace thermostat Thermostat wires broken or shorted Replace wire or wires * Current overload protector device Reset circuit breaker.
  • Page 44: Furnace - Electronic Ignition Models (Continued)

    Restricted or insufficient discharge ducting Ducting must meet furnace’s minimum requirements * No excess ducting or unnecessary bends * All closeable registers must be fully open and unrestricted * Furnace over fired Set gas pressure to a minimum of 11” W.C. with all appliances running replace regulator, if not obtainable.
  • Page 45: Furnace - Electronic Ignition Models (Continued)

    All closeable registers must be fully open and unrestricted * Defective limit switch Replace limit switch Furnace over fired Set gas pressure to a minimum of 11” W.C. with all appliances running replace regulator, if not obtainable. Also, check main burner orifice, it must comply with furnace’s specifications * BLOWER SHUTS OFF AT SAME TIME BURNER SHUTS OFF Faulty relay...
  • Page 46: Furnace Terminology

    FURNACE TERMINOLOGY Terminology Definition reinforced product used to AC Motor A Motor operating on 120 volts deliver the heated air from the furnace to the living area Adjustable Register A heat outlet capable of being opened and closed Air speed Indicators (anemometer) A tool used to (anemometer) measure the velocity of air...
  • Page 47 Pilot Light Assembly An assembly used to light the to dispel air from duct outlets burner on pilot models Thermocouple Safety device used to generate Plenum A enclosure that gathers air an electrical current sent to the and redirects it to specify gas valve (pilot) to hold the locations like the box around valve open.
  • Page 48: Flat Rate Schedule

    FLAT RATE SCHEDULE...
  • Page 59 7900-II / 8012-II Series Furnace Parts...
  • Page 62: 8500-Iv Ld & 2-Stage Series Furnace Parts

    8500-IV LD & 2-Stage Series Furnace Parts...
  • Page 67: 8900-Iv Dc & Ac - Ld & 2-Stage Series Furnace Arts

    8900-IV DC & AC - LD & 2-Stage Series Furnace arts...
  • Page 71: Warranty

    This warranty extends to the original owner of the product only and is subject to the following conditions: 1. For two years from the date of purchase, Atwood will repair FURNACE EXTENDED SERVICE CONTRACT or replace any part defective in material or workmanship.
  • Page 73 NOTES: ____________ ________________ ___...
  • Page 75 This manual has been provided courtesy of My RV Works, Inc. www.myrvworks.com You can find more RV service manuals here: www.myrvworks.com/manuals Over the years of running a mobile RV repair service, having a dedicated place to access service manuals for all the different appliances and components found on RVs was something that I always had a desire to create.

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