Atwood Mobile Products HYDRO FLAME 8940, HYDRO FLAME 8935 User Manual
LITERATURE NUMBER
MPD 31232
hydro flame
TM
8900-III-LD Series Furnace
MODELS 8935, 8940
Technical Installation Manual
ENGLISH, FRANCAIS (et Canada) •Installation
Effective 3/08
THIS INSTRUCTION MANUAL IS FOR USE BY AN AUTHORIZED SERVICE
TECHNICIAN TO INSTALL AN ATWOOD
INSTALLER
: LEAVE THIS MANUAL WITH APPLIANCE.
- hydro flame
TM
FURNACE.
CONSUMER: RETAIN THESE MANUAL FOR FURTHER
REFERENCE.
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: 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.
FURNACE SPECIFICATIONS ..............................................................1
DIMENSIONS ..................................................................1
WEIGHT ........................................................................1
MINIMUM CLEARANCE TO FLOORBOARDS, WALLS,
& SIMILAR COMBUSTIBLE BUILDING MATERIALS..................................2
SAFETY INFORMATION..................................................................1-2
FURNACE INSTALLATION ..................................................................2
VENT INSTALLATION - HORIZONTAL & VERTICAL ......................................2
WALL CUTOUT HORIZONTAL & VERTICAL ..............................................2-3
DUCTING HORIZONTAL & VERTICAL ......................................................3
Flexible Ducting......................................................................3
Hard Ducting ........................................................................3
OPTIONAL INSTALLATION - BOTTOM DISCHARGE KIT..................................3
GAS CONNECTION ........................................................................3
ELECTRICAL CONNECTIONS ..........................................................3-4
Conductor Sizing Table ............................................................3
12 volt DC Models ..................................................................3
120 volt AC Models ..............................................................3-4
Thermostat ..........................................................................4
CONVERTIBLE GAS CONTROL............................................................4
Valve Conversion ....................................................................4
Orifice Replacement ................................................................4
SYSTEM CHECK TESTS ....................................................................4
PROPANE GAS PRESSURE ..............................................................4
STATIC PRESSURE ........................................................................5
AC & DC WIRING DIAGRAMS ............................................................5
ILLUSTRATIONS ............................................................................6
REPLACEMENT PARTS LIST & DRAWING ..............................................7
INDEX
— 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.
SPECIFICATIONS *(W.C. = Water Column)
# 8935 8940 8935 8940
MODEL
BTU Input 35,000 40,000 35,000 40,000
Output BTU/HR 27,300 31,200 27,300 31,200
Type Gas LP LP LP/NAT LP/NAT
Duct Static Pressure - .10˝ W.C.* .10˝ W.C.* .10˝ W.C.* .10˝ W.C.*
Power Supply (
Watts - WITH OUT DOOR 151 151 360 360
Amperage 12.6 12.6 3 3
MINIMUM RETURN AIR 80 in
VOLTS) 12-DC 12-DC 120-AC 120-AC
DCLP-III DCLP-III ACLC-III ACLC-III
2
80 in
2
80 in
2
DIMENSIONS
ALL MODELS WITH DOOR WIDTH HEIGHT DEPTH
Casing 16-1/2˝ 9-1/8˝ 23-1/2˝ - 26˝ FURNACE 38 lbs.
Vent 5˝ 5-3/8˝ SHIPPING 45 lbs.
1
WEIGHT
80 in
2
FLOORBOARDS, WALLS & SIMILAR COMBUSTIBLE BUILDING MATERIALS*
MUST BE PROVIDED THE FULL LENGTH AND WIDTH OF UNIT
HORIZONTAL TOP
VERTICAL TOP ----1/2˝ BOTTOM ----0˝ SIDES ----1˝ REAR --1/2˝
MINIMUM CLEARANCE TO
----1/2˝ BOTTOM 3/16˝ SIDES ----1˝ REAR --1/2˝
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 materi-
als surrounding furnace (i.e. furnace should NOT be located under
furniture or in a closet space where clothing or other material
could be located.)
NOTE: 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.
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 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 to
MINIMUM CLEARANCE TO FLOORBOARDS, WALLS & SIMILAR COMBUSTIBLE BUILDING
. The total unobstructed return air opening size(s) must NOT BE
MATERIAL
LESS than specified in SPECIFICATIONS-MINIMUM RETURN AIR. Failure to meet
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.
• Installation must provide accessibility if any repairs are necessary to
the furnace. Failure to meet this requirement will create additional
labor costs that will be the responsibility of the installer.
•
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 the installation or operation of furnace.
• DO NOT directly 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 furnace 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.
• The furnace must always be installed level (front to back, side to
side) to prevent water intrusion into the interior.
WALL CUTOUT OPTIONS
RECOMMENDED WALL THICKNESS 0˝ to 2-1/2˝
Do not oversize hole - oversizing can result in water leakage.
EXTERIOR WALL CUTOUT (FIG 1)A B C
HORIZONTAL
& VERTICAL
VENT INSTALLATION (FIG 1)
HORIZONTAL & VERTICAL INSTALLATION
1. Locate vent hole cutout as called out in (FIG 1).
2. Drill 3-1/2˝ diameter hole through side wall of coach.
3. Remove vent and vent ring from furnace.
2
LOCATION
3-1/8˝ 2-3/8˝ 3-1/2˝
DIA HOLE
4. Insert furnace from backside of wall. Line up hole in wall and furnace.
5. Apply sealant to back of vent ring and vent cap base.
6. Install vent assembly with HOT at top for horizontal and on right
side for vertical installation (
FIG 1-1A). Slip vent into combustion air
intake tube. Secure to wall with four (4) screws.
7. Vent must have a minimum 1-1/4” over lap on exhaust tube and a
minimum 1/2˝ overlap on combustion airtube.
8. Horizontal units - secure to floor with two (2) screws through legs
on back of casing. Vertical units use vertical mounting brackets and
self-tapping screws to hold furnace to floor (tabs on control box can
be used also to secure furnace).
DUCTING - HORIZONTAL & VERTICAL (FIG 3-4A)
HORIZONTAL
PROPER DUCT INSTALLATION IS CRITICAL TO THE OPERATION OF THIS FURNACE
CONTINUOUS USE MATERIALS RATING
DUCTS 9˝ IN LENGTH OR MORE 200˚F.
4˝ DUCTS LESS THAN 9˝ IN LENGTH 250˚F.
METAL BOOTS LESS THAN 9˝ IN LENGTH 250˚F.
Ducting systems can include any combination of discharge openings, as
long as static pressure and minimum discharge area requirements are met.
ALL MODELS - (also see STATIC PRESSURE TEST)
REQUIRED MINIMUM DISCHARGE 48 IN
REQUIRED MINIMUM RETURN AIR 80 IN
• 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 min. discharge req.
Ducting in dead air space with no return air, such as holding tank
areas, does not count toward achieving min. discharge requirements.
• Adjust ducting installation to obtain air rise of 100˚F - 130˚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
1. Remove knockout plates from desired outlets.
2. Attach duct adapter to each opening, by inserting flange over casing,
locking 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 static pressure.
Hard Ducting Floor System
When designing Hard Duct 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 INSTALLATION - BOTTOM DISCHARGE (FIG 4-4)
1. Remove bottom discharge cover plate. This ducting option must
be connected to a ducting system. FIG 3 (parts breakdown) #40 -
GASKET AND PLENUM PLATE KIT is available when attaching furnace.
2. If cutout is required:
BOTTOM DISCHARGE ABCD
HORIZONTAL-WITHOUT DOOR (FIG 4) 18-20 1/2˝ 5-1/2˝ 10-1/2˝ 3/4˝
3. Fasten plenum plate (4-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, continue with STEP 5.
4. Position gasket (4-F) on plenum plate.
5. Set furnace on gasket, gasket must remains in position.
Use additional ducting to maintain correct static pressure.
FLOOR CUTOUT
2
2
VERTICAL
The only ducting option, when using vertical installation, are the top
two ducts and tw ducts off the back of the casing. This is the only
configuration allowed with vertical installation (
FIG 3A).
GAS CONNECTION
1. Connect gas line to fitting on top rear 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.
2. A 3/8˝ flared fitting connection is provided for 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 fitting and flare nut when tightening gas
)
line to fitting. (
FIG. 2
ELECTRICAL CONNECTION (FIG 5)
WARNING
INJURY OR PROPERTY DAMAGE
• Label all wires before disconnecting for service. 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
18 21 19 17 11 9
16 33 29 26 17 13
14 52 46 41 28 21
8 9 10 15 20
CAUTION
PROPERTY DAMAGE
• This connection is for low-voltage battery or direct current only. Do
not connect to 120- or 240- volts AC.
This unit is designed for negative ground 12 volt DC ONLY. Polarity
must be observed so furnace motor will run in proper rotation. DO NOT
attempt to alter to a positive ground system.
12 VOLT DC MODELS
Route 12 volt DC and thermostat leads to left side of control box. Use
a minimum of 18 GA wire to minimize voltage drop. The furnace must
be installed so electrical components are protected from water. To
make electrical connections: see
1. Route wiring to left side of furnace.
2. Connect red wire to positive side of power supply.
3. Connect yellow wire to grounded side of power supply.
4. Connect blue wire marked positive thermostat to + side wire of
thermostat using 22-18 GA stranded wire.
5. Connect the other blue wire to the other thermostat lead using
minimum 22-18 GA stranded wire.
See instruction with thermostat for complete wiring directions.
For best furnace performance when power supply is from a converter
equipped with a charging port, wire the converter to furnace parallel
with battery. This provides consistent voltage to furnace, increasing
component life, filtering power surges and AC spikes
VOLT AC MODELS
120
Route 120 volt AC and thermostat leads to wires located on the left
side of control box using a minimum of 18 GA wire. The furnace must
be installed so electrical components are protected from water. To
make electrical connections see WIRING DIAGRAM FIG 5.
3
WIRING DIAGRAM FIG 5
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