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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
• 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.
THIS INSTRUCTION MANUAL IS FOR USE BY AN AUTHORIZED SERVICE
TECHNICIAN TO INSTALL AN ATWOOD
- hydro flame
TM
FURNACE.
INSTALLER
: LEAVE THIS MANUAL WITH APPLIANCE.
CONSUMER: RETAIN THIS MANUAL FOR FURTHER REF-
ERENCE.
This furnace design has been certified for installation in recre-
ation 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 instruc-
tion nullifies the furnace warranty.
SAFETY ALERT SYMBOLS
Safety Symbols alerting you to potential personal safety hazards.
Obey all safety messages following these symbols.
ƽ WARNING ƽ CAUTION
avoid possible avoid possible
injury or death injury and/or property damage
INDEX
FURNACE SPECIFICATIONS ..............................................................1
DIMENSIONS ..................................................................1
WEIGHT ........................................................................1
MINIMUM CLEARANCE TO FLOORBOARDS, WALLS,
& SIMILAR COMBUSTIBLE BUILDING MATERIALS ..............................1-2
SAFETY INFORMATION..................................................................1-2
FURNACE INSTALLATION ..................................................................2
WALL CUTOUT OPTIONS HORIZONTAL & VERTICAL ......................................2
VENT INSTALLATION (MODELS WITHOUT DOOR) HORIZONTAL & VERTICAL................2
DUCTING HORIZONTAL & VERTICAL ....................................................2-3
Required Minimum Discharge Chart ............................................3
Flexible Ducting......................................................................3
Floor Ducting ........................................................................3
OPTIONAL INSTALLATION - BOTTOM DISCHARGE KIT..................................3
PROPANE GAS CONNECTION ............................................................3
ELECTRICAL CONNECTIONS..............................................................
3
Conductor Sizing Table
............................................................3
Thermostat Installation..........................................................3-4
SYSTEM CHECK TESTS ....................................................................4
DIAGNOSTIC CHART ......................................................................4
PROPANE GAS PRESSURE ..............................................................4
STATIC PRESSURE ........................................................................4
WIRING DIAGRAM ..........................................................................4
ILLUSTRATIONS ............................................................................5
REPLACEMENT PARTS LIST & DRAWING ..............................................6
SPECIFICATIONS (W.C. = Water Column)
MODEL 2540 LOW HIGH
BTU Input 25,000 40,000
Duct Static Pressure .10˝ W.C. .10˝ W.C.
12 Volt Amperage (AMPS) 7.2 16.8
Watts 86 202
Power Supply (VOLT DC)1212
Recommended Return Air 80 in
2
80 in
2
MINIMUM RETURN AIR 80 in
2
80 in
2
DIMENSIONS
WEIGHT
ALL MODEL WIDTH HEIGHT DEPTH
Casing 16-1/2˝ 9-1/8˝ 23 1/2˝ - 26˝ FURNACE 39 lbs
Door 19-1/4˝ 9-1/4˝ 1/4˝
SHIPPING 46 lbs
Recess Bezel 20-9/16˝ 11-1/2˝
VENT 5˝ 5-3/8˝
MINIMUM CLEARANCE TO
FLOORBOARDS, WALLS & SIMILAR COMBUSTIBLE BUILDING MATERIALS
MUST BE PROVIDED THE FULL LENGTH AND WIDTH OF UNIT
HORIZONTAL TOP
----1/2˝ BOTTOM 3/16˝ SIDES ----1˝ REAR --1/2˝
VERTICAL TOP
----1/2˝ BOTTOM ----0˝ SIDES ----1˝ REAR --1/2˝
ENGLISH, FRANCAIS (et Canada) •Installation
Effective 1/08
LITERATURE NUMBER
MPD 31230
hydro flame
TM
8900-III-LD
2 Stage Series Furnace
MODEL 2540
Technical Installation Manual
Patent No US 6,464,000. 6,719,207. Other Patents Pending
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