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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

)

12

12

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

5-3/8˝

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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