Atwood Mobile Products Furnace 7920-II User's Manual
Contents
1. leur PR CISEZ LES CARACT RISTIQUES NOMINALES Duct Adapter Couvercle de l ouverture d vacuation avant a Duct Cover Plate Couvercle de l lectrode Grand d flecteur d air du br leur PR CISEZ LES CARACT RISTIQUES NOMINALES a Air Hose lectrode Plaque de montage de l allumage lectron ique Thermostat SPECIFY COLOR Joint d tanch it de l lectrode Support de soupape k t Limit Switch L 170 oN JD O B N Echangeur thermique Module d vacuation PRECISEZ LA LONGUEUR ry CO 00 IN Oo JO B Oo PH O O Relay Joint d tanch it de la plaque du br leur ND On Off Circuit Breaker Interrupteur abattant 79 11 Exhaust Tube Assembly PR CISEZ LA LONGUEUR ET LE MAT RIAU N ere Burner Head Interrupteur abattant 80 11 Boite a air PRECISEZ LA LONGUEUR N N Manifold Ventilateur 79 11 Lumi re PR CISEZ LE CALIBRE N ee Motor Gasket Ventilateur 80 11 Moteur 79 112. OFF switch GROUND located in line with the gas _ asst vero valve is not used when a 4 asa i combination circuit breaker and ON OFF switch is used CIRCUIT BREAKER IMPORTANT Wiring must On Off Switch be replaced with wire rated Red __ 12VDC 105 C or higher Red THERMOSTAT Blue High Tension VENTING CHART F DIM M om EXHAUST TUBE EXT MIN MAX ss ALX ss ALY BOX 0 3 5 8 s 36441 35955 35921 36444 35941 0 MM 92 MM 3 5 8 7 1 8 4 5 8 36442 35956 35928 36446 35947 92 mu 181 MM 7 1 8 10 5 8 1 87 36443 35957 181 mm 270 mm 35930 36448 35951 KEEP CLEAR FURNACE KEEP CLEAR CD COACH INTERIOR 7 D 1 Ground Black a C mB 12 VDC DIAGNOSTIC CHART LED INDICATION Internal Circuit Board Failure Steady on no flashing Limit switch Airflow problems 1 flash with 3 second pause Flame Sense Fault 2 flashes with 3 second pause Ignition Lockout Fault 3 flashes with 3 second pause hydro flame 7900 II 8000 11 Series Furnace Appa
3. furnace on Cleats or on a wood or metal panel extending the full width and depth of furnace plus minimum clearances to combustibles Installation Procedure ZERO CLEARANCE AIR INTAKE CUTOUT ric 1 AIR INTAKE OPENING SIDE OF THE BLOWER WHEEL CUT OUT DIMENSION A B C D CABINET WALL 2 3 4 3 5 8 4 4 A 4 x 4 cabinet cut out must be provided when there is zero clearance between furnace and cabinet structure 1 Set aside combustion air box and exhaust tube extensions for instal lation from outside coach FURNACE VENT CUTOUTS Fic 2 CUT OUT DIMENSION A B INTERIOR CABINET WALL 8 3 8 11 1 4 DO NOT OVERSIZE HOLE OVERSIZING CAN RESULT IN WATER LEAKAGE CUT OUT DIMENSION C D E COACH EXTERIOR WALL FOR VENT 4 7 8 2 1 2 1 3 4 DUCTING Fic 3 Proper duct installation is critical to operation of furnace When installing ducts use materials rated for continuous use at 200 F Front discharge temperature should not exceed 250 F Flexible Ducting System When designing Flexible Duct Systems avoid sharp bends or crushed ducts Stretch all ducts and run them directly to outlets keeping quantity and angles of bends to a minimum 2 A variety of vent kits are available to provide the correct venting from fur nace to outside of vehicle To determine VENT LENGTH V Dim measure the distance from the back of furnace casing to outside vehicle side wall For proper vent kit check your V
4. Atwood 1120 North Main Street Elkhart IN 46514 PHONE 574 264 2131 FAX 574 206 9713 INTERNET http www atwoodmobile com ENGLISH FRANCAIS et Canada THIS INSTRUCTION MANUAL IS FOR USE BY AN AUTHORIZED SERVICE TECHNICIAN TO INSTALL AN ATWOOD hydro flame FURNACE INSTALLER LEAVE THIS MANUAL WITH THE APPLIANCE CONSUMER RETAIN THIS MANUAL FOR FUTURE REFERENCE This furnace design has been certified by the American Gas Association and Canadian Gas Association for installation in recreation vehicles as a MSP Category III furnace Follow this installation instruction to insure safe operation of the furnace Failure to install furnace according to this installation instruction nullifies the furnace warranty SAFETY ALERT SYMBOLS Safety Symbols alerting you to potential personal safety hazards Obey all safety messages following these symbols A CAUTION avoid possible injury and or property damage A WARNING avoid possible injury or death WARNING If the information in this manual is not followed exactly a fire or explosion may result causing property damage personal injury or loss of life Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance WHAT TO DO IF YOU SMELL GAS e Evacuate all persons from vehicle e Shut off gas supply at gas container or source e Do not touch any electrical switch or use any phone or radio in vehicle e Do
5. DIM ON VENTING CHART 3 Ducting available TYPE OF DISCHARGE Pp REMOVE O SIDE ONLY duct covers from both sides front discharge cover plate and side duct cover plate front discharge cover plate COMBINATION FRONT amp SIDE FRONT ONLY See DUCTING CONFIGURATIONS for covers and their locations 4 Install the furnace through cutout in cabinet area Secure furnace with two screws FIG 5 A OPTIONAL Installation The 79 II furnace may be installed in a cabinet behind a return air grille Fig 4 1 Door MUST be on furnace Return air grille must supply a minimum of 35 in of open area and be in front of door to furnace Provide an access opening for service and or removal of furnace The furnace must be side ducted NO front discharge Secure furnace to floor with one screw FIG 4 J 5 Remove cover plate from furnace Fic 4 D To install duct adapters for side discharge models insert back flange over casing and insert tab into square notch then twist adapter 180 Fig 4 E 6 Insert furnace into cabinet opening and secure with two screws through holes in control box flanges FIG 5 A 7 For side duct applications slide 4 flexible ducting material over duct adapters and secure FIG 3 VENTING 1 To install extension box Fic 4 C apply mastic or sealant to back of flanges on box Slide through outside wall cut out and into furnace air channel DO NOT FORCE OR BEND PARTS 2 Apply mastic or sealant to the top and side
6. OF SAE CONDUCTOR IN FEET FROM SOURCE TO DEVICE 18 61 45 36 30 26 23 20 18 12 16 96 72 58 48 41 36 32 29 19 A CAUTION PROPERTY DAMAGE e This connection is for low voltage battery or direct current only Do not connect to 120 or 240 volts AC This furnace is designed for negative ground 12 volts DC only Do not attempt to alter furnace for a positive ground system or connect furnace directly to 120 volts AC Damage to furnace components will occur and warranty will be voided Use a minimum of 22 18 GA wire to minimize voltage drop The furnace must be installed so electrical components are protected from water To make electri cal connections SEE WIRING DIAGRAM FIG 8 Remove screw from junction box on right side of furnace Fig 5 B Route wiring to right side of furnace Connect red wire Fic 5 C to positive side of power supply Connect black wire Fig 5 D to grounded side of power supply Connect white wire from furnace to thermostat FIG 5 E Connect thermostat wire from thermostat to 12VDC of power supply Fig 5 F Reinstall junction box cover FIG 4 F For best performance of furnace when power supply is from a converter equipped with a charging port wire the converter to furnace parallel with battery This pro vides consistent voltage to furnace increasing component life filtering power surges and AC spikes Fic 4 G amp H NOTE All units are supplied with a power switch which when turned off for servicin
7. e to combustibles cannot be maintained DO NOT modify furnace in any way DO NOT alter furnace for a positive grounding system DO NOT HI POT furnace unless electronic ignition system circuit board has been disconnected DO NOT use battery charger to supply power to DC model furnace even when testing DO NOT use 120 volt AC current with DC models DO NOT use furnace cabinet area as a storage compartment DO NOT vent furnace with venting system serving another appliance DO NOT vent furnace to an outside enclosed porch area DO NOT use for temporary heating of buildings or structures under construction Protect building materials from degrading from flue gas exhaust Protect furnace electrical components from water USA AND CANADA FOLLOW ALL APPLICABLE STATE AND LOCAL CODES IN THE ABSENCE OF LOCAL CODES OR REGULATIONS REFER TO CURRENT STANDARDS OF Recreation Vehicles ANSI 1192 NFPA 1192 National Fuel Gas Code ANSI Z223 1 CAN CGA B149 Installation Codes Federal Mobile Home Construction amp Safety Standard Title 24 CFR part 3280 or when this Standard is not applicable the Standard for Manufactured Home Installations Manufactured Home Sites Communities and Set Ups ANSI A255 1 and or CAN CSA Z240 MH Series Mobile Homes Ground National Electrical Code ANSI NFPA No 70 and or CSA C22 1 Park Trailers ANSI 119 5 NOTE The direct high voltage spark ignition generates a radio frequency
8. ed 6 Follow lighting instructions to place furnace in operation 7 Replace front door on furnace PROPANE GAS CONNECTION ric 5 Connect gas line to brass fitting on left side of furnace Be sure all male pipe threads other than flare fittings are treated with a sealing compound resistant to the action of propane LP gas Do noT put seal ing compound on flare fittings 1 Insert gas line through hole on left side 2 Connect gas line to brass fitting inside furnace casing immediately ahead of gas control valve Fic 5 B 3 A 3 8 flared fitting connection is provided at gas control valve inlet for gas supply connection to furnace The gas supply line of furnace must be of ade quate size to provide 11 W C gas pressure This pressure must be main tained under maximum flow conditions with all gas appliances operating 4 A 1 8 N P T plug is accessible for test gauge connection on gas valve assembly Fig 5 H 5 Use two wrenches to hold brass fitting and flare nut when tightening gas line to brass fitting Do noT twist valve assembly FIG 6 ELECTRICAL CONNECTION A WARNING INJURY OR PROPERTY DAMAGE e Label all wires before disconnecting for service Wiring errors can cause improper dangerous operation Verify proper operation after servicing e Disconnect electrical power before servicing Conductor Sizing Table MAX 10 VOLTAGE DROP 12 VDC CURRENT DRAW AMPS 3 4 5 6 7 8 9 10 15 GAGE MAX LENGTH
9. eseesaeneneees 3 OPTIONAL INSTALLATION DIRECTIONAL AIR BOX 44444 3 PROPANE GAS CONNECTION 3 ELECTRICAL CONNECTIONS 3 Thermostat Installation 3 Door Installati n siese cerere enna etes essuie 3 SYSTEM CHECK TESTS 2 52 uses soccer accede ieii ist eriei 4 PROPANE GAS PRESSURE FIGURES 1 8 INCLUDING DC WIRING DIAGRAM REPLACEMENT PARTS LIST amp DRAWING 8 DUCTING CONFIGURATIONS ONE side duct 79 80 SERIES 80 SERIES 8012 II W C Water Column 7912 11 7916 II 7920 II 8012 II 12 000 9 160 16 000 12 160 40 W C 3 4 40 8 18 000 12 000 Output Capacity BTU HR 13 680 9 120 Duct Static Pressure i 12 Volt Amperage AMPS Watts Power Supply Volt DC 12 MINIMUM RETURN AIR DIMENSIONS ALL MODEL Casing Door 35 in WEIGHT FURNACE 23 Ibs SHIPPING 25 Ibs HEIGHT 11 3 8 11 1 2 MINIMUM CLEARANCE TO FLOORBOARDS WALLS amp SIMILAR COMBUSTIBLE BUILDING MATERIALS MUST BE PROVIDED THE FULL LENGTH AND WIDTH OF UNIT Top and Sides 0 TO CASING SPACERS SCREW HEADS Extension Box Rear 0 0 Bottom 0 TO CASING SPACERS SCREW HEADS Spacing of 1 4 to ducting within 3 feet of furnace must be provided
10. g will remove power through the furnace wiring Switch must be in ON position for the furnace to operate FIG 5 1 THERMOSTAT INSTALLATION The thermostat is very sensitive HANDLE WITH CARE AT ALL TIMES Locate thermostat 48 to 54 above floor on an INTERIOR wall away from areas of abnormal heat or cold EXTERIOR wall location must have a 3 4 spacer between thermostat and exterior wall Follow manufacturer s installation instruction provided with thermostat When thermostat is not supplied use a thermostat rated for 12 VDC or 24 VAC min 1 AMP DOOR INSTALLATION Install door by sliding door flange over control box top flange and fastening door at bottom with 1 4 turn fastener Note To assure sufficient return air to circulating blower maintain specified clearances SYSTEM CHECKS NOOR WPM A WARNING FIRE OR EXPLOSION e Never check for leaks with an open flame PROPANE GAS PRESSURE TEST The furnace and any individual shut off valve must be disconnected from gas sup ply piping system during any pressure testing of system at test pressures of more than 1 2 PSI Before furnace is connected piping systems must be tested to be leak free The test must maintain air pressure of at least 6 of mercury or 3 PSI for at least 10 minutes The entire piping system must be maintained within a range of 10 14 W C with all appliances in operation Test gas connections for leakage with a leak test solu tion NOTE The ON
11. not start vehicle s engine or electric generator e Contact nearest gas supplier or qualified Service Technician for repairs e If you cannot reach a gas supplier or qualified Service Technician contact the nearest fire department e Do not turn on gas supply until gas leak s has been repaired Installation and service must be performed by a qualified Service Technician Service Center or gas supplier 1 MPD 32072 hydro flame 7900 11 8000 II Series Furnace Technical Installation Manual eInstallation Effective 1 08 INDEX FURNACE SPECIFICATIONS 1 DIMENSIONS 1 WEIGHT RS cits 1 DUCTING CONFIGURATION 1 MINIMUM CLEARANCE TO FLOORBOARDS WALLS amp SIMILAR COMBUSTIBLE BUILDING MATERIALS 2 SAFETY INFORMATION cccsccccsssecssseesescenseseesseeeessseeesseneees 1 2 FURNACE INSTALLATION 2 4 CUTOUTS save sovadecicedenvevsiedeaneadvecvincaebesedbocusaeassenineneeaveasacaareneve 2 DUCTING iiss coidesctacdieheetieteaieescwhe sna weitere an batene in cetudendebdonduapeinenan dees 2 3 Flexible DUGtin Qjccec sswawesca sega uccceets essence tienne tre meneur te emee N 2 Venting Chart cccsecccceceessecceeeeeeecseceeeeeeeeeeeeseeaees
12. reil de chauffage a air chaud S rie 7900 II 8000 11 Item Description of Parts Front Door Item Description of Parts 24 Motor Spacer El ment n Description des pi ces Moteur 80 I Electronic Ignition Board 25 Small Burner Air Baffle SPECIFY RATE Ventilateur d air de combustion Valve 25 Large Burner Air Baffle SPECIFY RATE Adaptateur de conduit Front Discharge Cover Plate 26 Electronic Ignition Mounting Plate Electrode Cover Plate 27 Valve Bracket Couvercle d ouverture de branchement Electrode 28 Vent Kit Specify Length Tuyau air Electrode Gasket Heat Exchanger 29 Exhaust Tube Assembly SPECIFY LENGTH amp MATERIAL Thermostat PR CISEZ LA COULEUR Rupteur thermique L 170 CO N OO B oo Burner Plate Gasket 30 Air Box Assembly SPECIFY LENGTH Relais a Sail Switch 79 1 31 Orifice SPECIFY RATE Coupe circuit marche arr t Sail Switch 80 1 a Blower Wheel 79 11 a Blower Wheel 80 11 a Motor 79 II l ment n Description des pi ces Panneau avant T te de br leur 7911 8011 Collecteur Joint d tanch it du moteur Entretoise du moteur ry Motor 80 II Plaquette d allumage lectronique a Combustion Wheel Soupape Petit d flecteur d air du br
13. s of outer edge of vent Cap DO NOT PLUG HOLES Slide assembly over furnace exhaust tube FIG 4 B push into wall and secure with two screws Note that bottom flange is not sealed to allow water drainage 3 The extension box has no minimum clearance requirement FIG 4 C 4 The vent outlet shall be installed as to be in the same atmospheric pressure zone as the combustion air intake No modification of vent system is allowed A WARNING CARBON MONOXIDE POISONING Properly seal vent system preventing carbon monoxide from entering coach 5 Install return air system to ensure negative pressure created by the circulating blower does not effect another appliance s combustion air supply or act to mix products of combustion with circulating air All appliances in the furnace cabinet must be directly vented outside DIRECTIONAL AIRBOX INSERT FIG 7 1 Remove front door of furnace 2 Follow shutdown procedure instructions affixed to furnace 3 Remove sheet metal screw holding circuit board plate to air box Retain to fasten Air Box Insert to bottom of air box FIG 7 A 4 Install Air Box Insert into air box pay attention to the direction you would like warm air diverted Make sure two holes in Air Box Insert line up with existing holes in air box Fic 7 B 5 Fasten Air Box Insert to top of air box using a 1 4 long 6 sheet metal screw Fasten bottom of Air Box Insert and circuit board plate to bottom of air box using the screw remov
14. that could cause interference with other microprocessor based equipment Locate equipment at least five feet from furnace location If this distance can not be maintained purchase KIT MPD 37773 a shielded high voltage lead A WARNING CARBON MONOXIDE POISONING Properly seal vent cap to side wall to prevent carbon monoxide from entering coach DO NOT draw combustion air from living area po noT vent exhaust air into the living area or an enclosed porch Return air is supplied through openings in furnace grille The return air passage must be kept clear for furnace to function properly Refer to MINIMUM CLEARANCE TO FLOORBOARDS WALLS amp SIMILAR COMBUSTIBLE BUILDING MATERIAL STANDARD FURNACE INSTALLATION General Installation Location e Install extension box and vent cap through an exterior wall DO NOT install furnace near tilt out rooms slide outs doors or other projections that could obstruct furnace exhaust e Locate furnace near midpoint of coach for single furnace applications DO NOT install vent in areas where projections or door openings come within 6 of vent tube opening DO NOT install furnace in an area where wires pipes or other objects will interfere with installation or operation of furnace It is not recommended to install furnace on material that restricts return air such as directly on carpet or soft material like vinyl e lf you must install furnace on carpet or soft material install
15. unless UL listed wire bound vinyl ducts are used All ducting material should be rated for continuous use of 200 F NOTE If Zero clearance is maintained from furnace to cabinet structure a 4 x 4 air intake cutout must be provided to blower wheel side of furnace at air intake opening NOTE Clearances are specifically for plywood or similar building materials surrounding the furnace i e furnace should not be located under furniture or in a closet space where clothing or other material could be located NOTE Furnace efficiency rating is a thermal rating determined under continuous operating conditions independent of any installation Eff rate is given at 77 minimum actual efficiency rating may be higher When furnaces are installed to minimum clearances an additional 16 in of return air must be provided to blower side of furnace or a 2 clearance the full length and height on blower side must be maintained A WARNING CARBON MONOXIDE POISONING Furnace must be installed and vented to these instructions Improper installation adjustment alteration service or maintenance can Cause injury or property damage Improper installation location may cause furnace to produce negative pressure affecting combustion air or venting of other appliances A CRITICAL INSTALLATION WARNINGS DO NOT install furnace on material that restricts return air like carpet or any soft material such as vinyl DO NOT install where clearanc
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