Table Of Contents; Warning Carbon Monoxide Poisoning; Carbon Monoxide Poisoning; Model Nomenclature - Dometic AFM Series Technical Installation Manual

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.
WARNING

CARBON MONOXIDE POISONING

 Furnace must be installed and vented according to these
instructions.
 Improper
installation, adjustment,
maintenance can cause injury or property damage.
Improper installation location may cause furnace to produce negative
pressure, affecting combustion air or venting of other appliances.
WARNING
CARBON MONOXIDE POISONING

Properly seal door to prevent carbon monoxide from entering
coach.

Properly adjust draft cap to prevent carbon monoxide from entering
coach.

MODEL NOMENCLATURE

AF M D 25
Dometic
Cabinet Voltage Input
Furnace Size Btu/hr
AF M=medium D=12
16K
VDC
20K
25K
30K
35K
Contents
MODEL NOMENCLATURE ....................................................... 2
MODEL SPECIFICATIONS ....................................................... 2
DIMENSIONS ................................................................................... 2
INSTALLATION AND SAFETY CODESError! Bookmark not defined.
INSTALLATION CODES ................... Error! Bookmark not defined.
GENERAL FURNACE INSTALLATIONS .................................. 2
CLEARANCE TO COMBUSTIBLES: ............................................... 3
REQUIRED DUCTING ...................................................................... 3
REQUIRED DISCHARGE ................................................................. 3
FLEXIBLE DUCTING
AIR FLOW CHECK ........................................................................... 4
FURNACE INSTALLATION ....................................................... 4
SIDEWALL CUTOUT ....................................................................... 4
SMALL VENT INSTALLATION ................................................. 5
STANDARD DOOR INSTALLATION ........................................ 5
FLUSH DOOR INSTALLATION ................................................ 6
HARD DUCT SYSTEMS ............................................................ 6
FLOOR DISCHARGE CUTOUTS ..................................................... 6
GAS CONNECTION .................................................................. 6
ELECTRICAL CONNECTIONS ................................................. 7
THERMOSTAT INSTALLATION ............................................... 7
OPERATING INSTRUCTIONS .................................................. 7
TO SHUT DOWN UNIT ..................................................................... 8
IGNITION CONTROL DIAGNOSTIC CODES ............................ 8
alteration, service or
1 1 1 A
Gas Gas Valve Model
Type Location Rev
1=LP 1=door 1=Single A
2=LD (small
vent)
3=door w/
rear gas
fitting
4=door
w/pigtail
5=door w/
pigtail & rear
gas fitting
WIRING AND LADDER DIAGRAM ............................................ 8

MODEL SPECIFICATIONS

Models AFMD16
Type of LP
Gas Propane
BTU Input 16,000
BTU 12,160
Output
.20" WC
Duct
Static
Pressure
Amperage 4.2*
(AMPS)
Watts 50
Power 12
Supply
(Volt DC)
2
Return Air 80 in
2
Minimum 65 in
Return Air
WATER
(WC = COLUMN)
*
15 AMP DECATATED CIRCUIT FOR FURNACE

DIMENSIONS

Approx. Width
Casing 16-1/2"
STD Door 19-1/4"
FLUSH
19-3/8"
DOOR
Vent LD 5-1/2"
INSTALLATION AND SAFETY CODES

USA and Canada - follow all applicable state and local codes in
the absence of local codes or regulations, refer to current
standards of:

ANSI/NFPA 1192 Recreational Vehicles Code and ANSI/RVIA LV
Low Voltage Systems in Conversion and Recreational Vehicles

CSA Z240.4, Gas-Equipped Recreational Vehicles and Mobile
Housing

National Fuel Gas Code ANSI Z223.1 and/or CAN/CGA B149

This furnace must be installed in accordance with the
manufacturer's instructions and the manufactured Home
Construction and Safety Standard, Title 24 CFR, part 3280, or
when such 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 M92 Canadian Standard for Mobile Homes."

ANSI A 255.1 and/or CAN/CSA-Z240.6.2 MH Series, Mobile
4
Homes

Ground National Electrical Code ANSI/NFPA 70 and/or CSA
C22.1, Part 1

Park Trailers ANSI 1195

GENERAL FURNACE INSTALLATIONS


All models can be installed in either a horizontal or vertical
mounting position horizontal installed units have the gas line
positioned on top or rear, vertical installed units must have the
vent located at the floor and gas line at right side and rear.

Always install furnace through an exterior wall.

DO NOT install furnace near tilt-out rooms, slide-outs, doors or
other projection 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.
2
AFMD20 AFMD25 AFMD30
LP LP LP
Propane Propane Propane
20,000 25,000 30,000
15,200 19,000 22,800
.10" WC .10" WC .10" WC
4.2* 7.5* 7.5*
50 90 90
12 12 12
2 2 2
80 in 80 in 80 in
2 2 2
65 in 65 in 65 in
Height Depth
7" 20"
3/4"
9-3/4"
7/32"
10-1/4"
5-1/2" 1-1/16"
AFMD35
LP
Propane
34,000
25,840
.10" WC
11.1*
132
12
2
80 in
2
65 in
Weight
Furnace
26lbs.
Boxed
29 lbs.