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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.
WARNING 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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