Atwood 8516, 8520, 8531, 8535, 8525 Technical Installation Manual
LITERATURE NUMBER
MPD 33179
hydro flame
TM
8500-IV Series Furnace
9
ENGLISH, FRANCAIS (et Canada) •Installation •Maintenance
THIS INSTRUCTION MANUAL IS FOR USE BY AN AUTHORIZED SERVICE
TECHNICIAN TO INSTALL AN ATWOOD
TO THE INSTALLER: THESE INSTRUCTIONS MUST BE SUPPLIED WITH THE FUR-
NACE TO THE CONSUMER.
TO THE CONSUMER: PLEASE RETAIN THESE INSTRUCTIONS FOR FURTHER REFER-
ENCE.
- hydro flame
This furnace design has been certified 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.
WARNING CAUTION
avoid possible avoid possible
injury or death injury and/or property damage
WARNING
FIRE OR EXPLOSION
• 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.
FOR YOUR SAFETY
WARNING
FIRE OR EXPLOSION
WHAT TO DO
IF YOU SMELL GAS
• Evacuate ALL persons from vehicle.
• Shut off gas supply at gas container or source.
• DO NOT touch any electrical switch, or use any phone or
radio in vehicle.
•
DO NOT start vehicle’s engine or electric generator.
• Contact nearest gas supplier or qualified Service Technician
for repairs.
• If you cannot reach a gas supplier or qualified Service
Technician, contact the nearest fire department.
•
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.
TM
FURNACE.
FURNACE SPECIFICATIONS ..............................................................1
DIMENSIONS ..................................................................1
WEIGHT ........................................................................1
MINIMUM CLEARANCE TO FLOORBOARDS, WALLS,
& SIMILAR COMBUSTIBLE BUILDING MATERIALS..................................2
SAFETY INFORMATION..................................................................1-2
FURNACE INSTALLATION ..................................................................2
WALL CUTOUTS ..........................................................................2
DUCTING................................................................................2-3
Required Minimum Discharge Chart ............................................3
Flexible Ducting......................................................................3
Floor Ducting ........................................................................3
OPTIONAL INSTALLATION - BOTTOM DISCHARGE KIT..................................3
OPTIONAL INSTALLATION - EXTENSION BOX KIT ......................................3
OPTIONAL INSTALLATION - FLEX ADAPTER KIT........................................3
PROPANE GAS CONNECTION ............................................................
ELECTRICAL CONNECTIONS..............................................................
Conductor Sizing Table ............................................................3
Thermostat Installation ............................................................4
DOOR INSTALLATION ....................................................................4
Horizontal and Vertical Door Option ............................................4
Recess Bezel Door Option ........................................................4
DRAFT CAP ASSEMBLY ..................................................................4
OPTIONAL FURNACE INSTALLATION - Recessed Furnace........................4-5
SYSTEM CHECK TESTS ....................................................................5
PROPANE GAS PRESSURE ..............................................................5
STATIC PRESSURE ........................................................................5
DC WIRING DIAGRAM......................................................................5
ILLUSTRATIONS ............................................................................6
REPLACEMENT PARTS LIST & DRAWING ..............................................7
SPECIFICATIONS (W.C. = Water Column)
MODEL # 8516-IV 8520-IV 8525-IV 8531-IV 8535-IV
BTU Input 16,000 20,000 25,000 30,000 34,000
Duct Static Pressure .20˝ W.C.* .10˝ W.C.* .10˝ W.C.* .10˝ W.C.* .10˝ W.C.*
12 Volt Amperage (AMPS) 4.6 4.6 7.6 7.6 9.8
Watts 55 55 91 91 118
Power Supply (
Recommended Return Air 80 in
MINIMUM RETURN AIR 65 in
VOLT DC)12 12 12 12 12
DIMENSIONS
ALL MODELS WIDTH HEIGHT DEPTH
Casing 16-1/2˝ 7-3/8˝ 18˝ FURNACE 30 lbs
Door 19-1/4˝ 9-1/4˝ 1/4˝ SHIPPING 32 lbs
Recess Bezel 20-9/16˝ 11-1/2˝
MODELS 8516, 8520, 8525,
8531, 8535
Technical Installation Manual
Effective 1/08
INDEX
2
2
80 in
65 in
2
2
80 in
65 in
2
2
80 in
65 in
2
80 in
2
65 in
WEIGHT
3
3
2
2
1
FLOORBOARDS, WALLS & SIMILAR COMBUSTIBLE BUILDING MATERIALS*
MUST BE PROVIDED THE FULL LENGTH AND WIDTH OF UNIT
HORIZONTAL TOP AND SIDES
VERTICAL TOP AND SIDES ------1/2˝ REAR --1˝ BOTTOM ------0˝(SLIDE PLATE)
MINIMUM CLEARANCE TO
------1/2˝ REAR --1˝ BOTTOM --3/16˝
Spacing of 1/4˝ to ducting within 3 feet of furnace must be provided
unless UL listed wire bound vinyl ducts are used. All ducting material
should be rated for continuous use at 200˚F.
NOTE: Clearances are specifically for plywood or similar building
materials surrounding furnace (i.e. furnace should NOT be located
under furniture or in 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. Efficiency
rate is given at 77% minimum, actual efficiency rating may be higher.
*When furnaces are installed to minimum clearances, an additional 16
2
of return air must be provided to blower side of furnace, or a 2˝
in
clearance the full length and height on blower side must be
maintained.
WARNING
CARBON MONOXIDE POISONING
• Furnace must be installed and vented to these instructions.
• Improper installation, adjustment, alteration, service or mainte-
nance can cause injury or property damage.
• Improper installation location may cause furnace to produce neg-
ative pressure, affecting combustion air or venting of other appliances.
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 furnace where clearance 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 A119.2/NFPA 501C.
• National Fuel Gas Code ANSI Z223.1 and/or CAN/CGA B149
Installation Codes
• Federal Mobile Home Construction & 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
that could cause interference with other microprocessor based
equipment. Locate equipment at least five feet (5’) from furnace
location. If this distance cannot be maintained, purchase MPD 37773
(a shielded high voltage lead).
WARNING
CARBON MONOXIDE POISONING
• Properly seal door, adjust draft cap (OR ON MODELS WITHOUT DOOR) install
vent assembly) to prevent carbon monoxide from entering coach.
• DO NOT draw combustion air from living area. DO NOT vent exhaust
air into the living area or an enclosed porch.
Return air is supplied through openings in furnace casing. All return
air passages must be kept clear for furnace to function properly. Refer
MINIMUM CLEARANCE TO FLOORBOARDS, WALLS & SIMILAR COMBUSTIBLE BUILDING
to
MATERIAL. The total unobstructed return air opening size(s) must NOT BE
than specified in SPECIFICATIONS - MINIMUM RETURN AIR. Failure to meet
LESS
minimum return air requirements nullifies furnace warranty.
STANDARD FURNACE INSTALLATION
General Installation -
• Install furnace through an exterior wall.
• DO NOT install furnace near tilt-out rooms, slide-outs, doors or
other projections that could obstruct furnace exhaust.
• 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).
• If you must install furnace on carpet or soft material, install fur-
nace on cleats, or on a wood or metal panel extending the full
width and depth of furnace plus minimum clearances to combustibles.
• DO NOT use petroleum or citrus type cleaners on plastic parts, as
damage may occur.
LOCATION
WALL CUTOUT OPTIONS
RECOMMENDED WALL THICKNESS 1-1/2˝ to 2-1/2˝
DO NOT OVERSIZE HOLE
EXTERIOR WALL CUTOUT ABC
HORIZONTAL (FIG 1) 17˝ 7-1/2˝ 19˝
VERTICAL (FIG 2) 7-1/2˝ 17˝ 19˝
RECESS BEZEL
*
RECESS BEZEL:To cut rounded corners: with radius blocks 2-1/8˝ radius
- OVERSIZING CAN RESULT IN WATER LEAKAGE
(FIG 1) 19-1/2˝ 10˝ *
without radius blocks a 45˚ angle
CAUTION
PERSONAL INJURY
• DO NOT allow furnace tabs to protrude through side wall cutout
opening during installation process until door is installed and tabs
are bent over. Tabs have sharp edges.
ALL OPTIONS: Place furnace in cavity. DO NOT have tabs protrude outside
exterior wall until door is ready to be installed.
DUCTING (FIG 4-7)
Proper duct installation is critical to operation of furnace. When
installing ducts, use materials rated for continuous use at 200˚F.
HORIZONTAL INSTALLION - USING SIDE DUCT OPTIONS - must have a minimum
of one duct from both left and right side of casing.
2
Required Minimum Discharge - (also see STATIC PRESSURE TEST)
MODELS REQUIRED DISCHARGE
8516-IV, 8520-IV ............................................................24in
8525-IV & 8531-IV ........................................................36in
8535-IV ..........................................................................48in
ALL MODELS - TOP OR BOTTOM DISCHARGE SYSTEMS..................48in
8525-IV, 8531-IV, 8535-IV VERTICAL INSTALLATION ..............48in
2
2
2
2
2
(EXCEPT WHEN USING THE THREE REAR DUCT OPENINGS OR MODELS WITHOUT DOOR)
• See MINIMUM CLEARANCE TO FLOORBOARDS, WALLS & SIMILAR COMBUSTIBLE
BUILDING MATERIALS.
• Each 4-inch duct opening provides 12 in
2
of discharge area. Provide
an extra 12 in2of non closeable duct discharge area for each
closeable register used.
• Use of 2˝ ducts does not count toward achieving minimum discharge
requirements. Ducting in dead air space with no return air, such as
holding tank areas, does not count toward achieving minimum discharge requirements.
• Adjust ducting installation to obtain air rise of 100˚F-130˚F.
Flexible Ducting Systems
When designing Flexible Duct Systems:
• avoid sharp bends or crushed ducts
• stretch all ducts and run them directly to outlets, keeping quanti-
ty and angles of bends to a minimum
1. Remove knockout plates from desired outlets.
2. Attach a duct adapter to each opening, by inserting flange over casing, locking the tab into casing slot and turning adapter 90˚.
3. Attach and secure
FOUR-INCH flexible ducts to adapters.
4. Run ducts to desired location within RV, secure to registers.
5. Additional ducting may be needed to maintain correct static pressure.
Hard Ducting Floor Systems
When designing Hard Ducting Systems:
• undersize ducting will cause high temperature limiting
• oversize ducting will cause inadequate air flow from registers
• when hard ducting is 1-1/2˝ in depth, an additional flex duct may be
needed to maintain installation static requirements
DO NOT install floor registers within 2 feet of return air openings.
•
OPTIONAL INSTALL - BOTTOM/TOP DISCHARGE OR VERTICAL BOTTOM (FIG 5)
1. Remove bottom/top discharge cover plate. This ducting option
must be connected to a ducting system. FIG 15 #4 -
PLENUM PLATE is available when attaching furnace.
2. If cutout is required:
BOTTOM DISCHARGE(FIG 5)ABCD
FLOOR CUTOUT
8-1/4˝ 9-1/2˝ 6-1/4˝ 1/4˝
3. Fasten plenum plate (5-E) over floor cutout. If a gasket and
plenum plate are not used, seal furnace to hard duct system making sure seal is air-tight and continue with STEP 5.
4. Position gasket (5-F) on plenum plate.
5. Set furnace on gasket, make sure gasket remains in position.
6. Additional ducting can be used to maintain correct static pressure.
OPTIONAL INSTALLATION - EXTENSION BOX KIT (FIG 6)
FIG 15 #7 Extension Box #7 and FIG 15 #54 Plenum Plate may be
used for top or bottom discharge installation. A casing extension box
adds 6˝ of depth to furnace.
1. Remove three knockouts from rear of furnace.
2. If cutout is required:
(FIG. 6) ABCDE
EXTENSION BOX 18˝ 1/2˝ 5˝ 16˝ 1/4˝
3. Place extension box with foam gasket against furnace, making
sure the three openings are enclosed within extension box. With
extension box held in place, secure with two 1/2˝ sheet metal screws.
GASKET AND
FLOOR CUTOUT
3
4. Fasten plenum plate over cutout.
5. Position gasket on plenum plate.
6. Set furnace on gasket, make sure gasket remains in position.
7. Fasten extension box to floor with two 1/2˝ sheet metal screws.
8. Additional ducting can be used to maintain correct static pressure.
OPTIONAL INSTALLATION - FLEX ADAPTER KIT (FIG. 7)
A flex adapter FIG 15 #26 may be used to provide more flexibility for
alignment of discharge opening on hard duct systems. This system
can be used on all models installed horizontally or vertically providing ducting from rear of furnace without using side ducts.
1. Remove three knockouts from rear of furnace.
2. If cutout is required, use placement and cutout dimensions for the
EXTENSION BOX (FIG. 6).
3. Install duct adapters (7-A) in each opening.
4. Place flex adapter plate (7-C) with foam tape against hard ducting,
making sure openings line up.
5. With plate held in place, fasten plate to ducting (7-D).
6. Install three duct adapters into flex adapter plate.
7. Attach flexible ducting (7-B) from furnace to flex adapter plate and
secure ducting in place.
8. Additional ducting can be used to maintain correct static pressure.
PROPANE GAS CONNECTION (FIG. 1)
1. Connect gas line to brass fitting on right 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
sealing compound on flare fittings.
WITH DOOR ONLY
• Remove slide plate (1-E) and gas inlet plug (1-F) from furnace.
• Insert gas line (1-G) through gas inlet plug (
DO NOT CUT).
• Connect gas line through gas inlet plug inside furnace casing
immediately ahead of gas control valve.
• A 1/8˝ N.P.T. plug is accessible for test gauge connection on gas
valve assembly.
2. A 3/8˝ flared fitting connection is provided at gas control valve inlet
for gas supply connection to furnace. The gas supply line of the furnace must be of adequate size to provide 11˝ W.C. gas pressure.
This pressure must be maintained under maximum flow conditions
with all gas appliances in operation.
3. Use two wrenches to hold brass fitting and flare nut when tightening
gas line to brass fitting.
DO NOT twist valve assembly (FIG. 8).
ELECTRICAL CONNECTION (FIG. 14)
WARNING
INJURY OR PROPERTY DAMAGE
• Label all wires before disconnecting for servicing. Wiring errors
can cause improper and dangerous operation. Verify proper operation after servicing.
• Disconnect electrical power before servicing.
Conductor Sizing Table - MAX. 10% VOLTAGE DROP - (12 VDC)
CURRENT DRAW (AMPS)
GAGE MAX. LENGTH OF SAE CONDUCTOR (IN FEET) FROM SOURCE TO DEVICE
34567891015
18 57 43 34 29 25 21 19 17 11
16 87 65 52 43 37 33 29 26 17
CAUTION
PROPERTY DAMAGE
• This connection is for low-voltage battery or direct current only. Do
not connect to 120- or 240- volts AC.
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