INSTALLATION
INSTRUCTIONS
DF Series Furnace
Models DFSAD12, DFSD12, DFSD16, DFSD20, DFMD16,
DFMD20, DFMD25, DFMD30, DFMD35, DFLD35,
DFLD40, DFLA35, DFLA40
INTRODUCTION ............................................................................. 2
IMPORTANT SAFETY INSTRUCTIONS AND DOCUMENT SYMBOLS .................................... 2
GENERAL INFORMATION ...................................................................... 4
PRE-INSTALLATION ........................................................................... 6
INSTALLATION .............................................................................. 16
TESTING ................................................................................... 24
TROUBLESHOOTING ........................................................................ 25
REPLACEMENT PARTS ........................................................................ 25
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in serious
injury, death or property damage.
− 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 the vehicle.
• Shut off the gas supply at the gas container or source.
• Do not touch any electrical switch, or use any phone or radio
in the vehicle.
• Do not start the vehicle's engine or electric generator.
• Contact the 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 the gas supply until the gas leak(s) has been
repaired.
− Installation and service must be performed by a qualified
installer, service agency, or the gas supplier.
Read these instructions carefully. These instructions MUST stay with this product.
Form No. 33400 09/17
©2017 Dometic Corporation
LaGrange, IN 46761
USA & CANADA
SERVICE OFFICE
Dometic Corporation
1120 North Main Street
Elkhart, IN 46514
SERVICE CENTER &
DEALER LOCATIONS
Visit:
www.eDometic.com
INTRODUCTION
This manual is for use by an authorized service technician to install a Dometic DF Series Furnace. Should you require further
information, contact Dometic. The design of the DF Series Furnace (hereinaer referred to as “Furnace”) has been certified for
installation in a recreational vehicle (hereinaer referred to as “RV”) as an MSP Category III Furnace. Follow these instructions to
ensure the correct installation of the Furnace. Failure to install the Furnace according to these installation instructions nullifies the
Furnace warranty.
Dometic Corporation reserves the right to modify appearances and specifications without notice.
IMPORTANT SAFETY INSTRUCTIONS AND DOCUMENT SYMBOLS
This manual has safety information and instructions to help you eliminate or reduce the risk of accidents and injuries.
A. Recognize Safety Information
This is the safety alert symbol. It is used to alert you to potential physical injury hazards. Obey all safety messages that follow
this symbol to avoid possible injury or death.
B. Understand Signal Words
A signal word will identify safety messages and property damage messages, and will indicate the degree or level of hazard
seriousness.
indicates a hazardous situation that, if NOT avoided, could result in death or serious injury.
indicates a hazardous situation that, if NOT avoided, could result in minor or moderate injury.
is used to address practices NOT related to physical injury.
Indicates additional information that is not related to physical injury.
C. Supplemental Directives
Read and follow all safety information and instructions to avoid possible injury or death.
Read and understand these instructions before installation of this product.
Incorrect installation of this product can lead to serious injury or death.
The installation MUST comply with all applicable local or national codes, including the latest edition of the following standards:
U.S.A.
• ANSI/NFPA70, National Electrical Code (NEC)
• ANSI/RVIA LV, Low Voltage Systems in Conversion and
Recreational Vehicles
• ANSI/NFPA 1192, Recreational Vehicles Code
• ANSI Z223.1, NFPA 54 National Fuel Gas Code
• ANSI 1195, Park Trailers
FOR DFLA35 and DFLA40 Models Only
This Furnace is manufactured for use with Liquid Propane (LP) gas. A kit has been provided with the Furnace, so that a qualified
service technician can convert the Furnace for use with natural gas. Any conversion to natural gas must conform with local
codes, or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 Natural Gas and Propane
Installation Code, in addition to the Standard for Recreational Vehicles NFPA1192 and CSA Z240 RV Recreational Vehicle Code.
CANADA
• CSA C22.1, Parts l & ll, Canadian Electrical Code
• CSA Z240 RV Series, Recreational Vehicles
• CAN/CGA B149, Natural Gas and Propane Installation
Code
2
IMPORTANT SAFETY INSTRUCTIONS AND DOCUMENT SYMBOLS
D. General Safety Messages
Failure to obey the following warnings could result in property damage, serious injury, or death:
• This Furnace MUST be installed by a qualified service technician.
• Do NOT modify this Furnace in any way. Modifi cation can be extremely hazardous.
• FIRE OR EXPLOSION HAZ ARD:
• Do NOT store gasoline, oil- or gasoline-soaked rags, or other flammable vapors and liq uids, inside storage compartment(s).
• BEFORE refueling or parking near a gas oline pump, make sure ALL LP gas appliances (vented to the outside of the RV) are
shut OFF. Oth erwise, fumes from gasoline pumps could come into contact with an LP gas appliance burner flame and ignite.
• Turn OFF LP gas supply at tank.
• Use only with the type of gas approved for the Furnace. Refer to the Furnace rating plate.
• Use only Dometic replacement parts and components, which are specifically approved for use with the Furnace.
• CRITICAL INSTALLATION WARNINGS:
• Do NOT install this Furnace if any part has been underwater.
• Sheet metal edges are sharp; take care when handling or touching edges.
• Protect Furnace electrical components from water.
• Protect building materials from degrading from vent assembly gas exhaust.
• Compartment MUST be closed when operating the Furnace.
• Do NOT install screens over the intake air or exhaust vents for any reason.
• CARBON MONOXIDE HAZARD:
• This Furnace can produce carbon monoxide, which has no odor and can be life-threatening. The burner and vent assembly
system MUST be kept clean.
• Doors MUST be properly sealed and the dra cap and assemblies MUST be adjusted and sealed correctly to prevent
carbon monoxide from entering the RV.
• Do NOT allow snow or any objects to block the exhaust system of the Furnace.
• Combustion products MUST be properly vented to the atmosphere and all combustion air supplied to the burner MUST be
drawn from the outside atmosphere.
• Use only Dometic replacement parts and components, which are specifically approved for use with the Furnace.
• ELECTRICAL SHOCK HAZARD:
• Make sure AC power is dis connected from the Furnace during installation.
• Furnaces with 12 VDC connection are for low-voltage battery or direct current only. DC Furnaces are designed for negative
ground 12 VDC only. Do NOT attempt to alter the Furnace for a positive ground system or connect the Furnace directly to
120 or 240 VAC.
• Do NOT use a battery charger to supply power to DC model Furnaces, even when testing.
• Use only Dometic replacement parts and components, which are specifically approved for use with the Furnace.
3
GENERAL INFORMATION
INCLUDED HARDWARE
(2) Mounting Bracket (2 to 3) Duct Adapter (depending on Furnace model)
Ventilation Assembly 15 Amp Breaker (DFMD35,DFLD35 & DFLD40 models only)
REQUIRED TOOLS AND MATERIALS
Manometer Gauge/U-Tube Volt-Ohm Meter (15+ amps)
Gas Leak Detector Liquid Wrenches
Safety Glasses RTV Type Sealant
Pipe Thread Sealing Compound Foil Tape (optional)
A. Model Specifications
DFSAD12, DFSD12, DFSD16, DFSD20 (Small Furnace Models)
MODELS
TYPE OF GAS
BTU INPUT
BTU OUTPUT
DUCT STATIC PRESSURE
AMPERAGE (AMPS)
WAT TS
POWER SUPPLY (VOLT DC)
MINIMUM RETURN AIR
DFSAD12 DFSD12 DFSD16 DFSD20
LP Gas LP Gas LP Gas LP Gas
12,000 12,000 16,000 18,000
9,120 9,120 12,160 13,680
0.10" WC, 0" WC front 0.10" WC 0.10" WC 0.10" WC
2.4* 3.4* 3.4* 4.8*
34 41 56 34
12 12 12 12
35 in.
2
35 in.
2
WC = Water Column; *15 Amp dedicated circuit for Furnace
DFMD16,DFMD20, DFMD25, DFMD30, DFMD35 (Medium Furnace Models)
MODELS
TYPE OF GAS
BTU INPUT
DFMD16 DFMD20 DFMD25 DFMD30 DFMD35
LP Gas LP Gas LP Gas LP Gas LP Gas
16,000 20,000 25,000 30,000 35,000
35 in.
2
35 in.
2
BTU OUTPUT
DUCT STATIC PRESSURE
AMPERAGE (AMPS)
WAT TS
POWER SUPPLY (VOLT DC)
RETURN AIR
MINIMUM RETURN AIR
12,160 15,200 19,000 22,800 25,840
0.20" WC 0.10" WC 0.10" WC 0.10" WC 0.10" WC
4.2* 4.2* 7.5* 7.5* 11.1*
50 50 90 90 132
12 12 12 12 12
2
80 in.
2
65 in.
WC = Water Column; *15 Amp dedicated circuit for Furnace
80 in.
65 in.
2
2
4
80 in.
65 in.
2
2
80 in.
65 in.
2
2
80 in.
65 in.
2
2
GENERAL INFORMATION
DFLD35, DFLD40, DFLA35, DFLA40 (Large Furnace Models)
MODELS
TYPE OF GAS
BTU INPUT
BTU OUTPUT
DUCT STATIC PRESSURE
AMPERAGE (AMPS)
WAT TS
POWER SUPPLY
RETURN AIR
MINIMUM RETURN AIR
DFLD35 DFLD40 DFLA35 DFLA40
LP Gas LP Gas LP Gas & Natural Gas LP Gas & Natural Gas
35,000 40,000 35,000 40,000
26,600 30,400 26,600 30,400
0.10" WC 0.10" WC 0.10" WC 0.10" WC
12.5** 12.5** 2.5* 2.5*
138 138 154 154
12 VDC 12 VDC 12 VAC 12 VAC
80 in.
65 in.
2
2
80 in.
65 in.
2
2
80 in.
65 in.
WC = Water Column; *15 Amp dedicated circuit for Furnace; **20 Amp dedicated circuit for Furnace
B. Model Dimensions
DFSAD12, DFSD12, DFSD16, DFSD20 (Small Furnace Models)
COMPONENT WIDTH HEIGHT DEPTH WEIGHT
2
2
80 in.
65 in.
2
2
Casing 12" 7" 20"
Small Vent 4-7/16" 4-7/16" 1-1/16"
Door 14-3/4" 9-3/4" 1/2"
Interior Grill 8-1/2" 12-1/2" 1/2"
Trim Ring 14-1/8" 10-1/8" 1/8"
DFMD16,DFMD20, DFMD25, DFMD30, DFMD35 (Medium Furnace Models)
COMPONENT WIDTH HEIGHT DEPTH WEIGHT
Casing 16-1/2" 7" 20"
STD Door 19-1/16" 9-1/2" 7/16"
Flush Door 20-5/8" 11" 7/32"
Small Vent 4-7/16" 4-7/16" 1-1/16"
DFLD35, DFLD40, DFLA35, DFLA40 (Large Furnace Models)
COMPONENT WIDTH HEIGHT DEPTH WEIGHT
Casing 16-1/2" 9" 20"
Furnace 21 lbs.
Boxed 24 lbs.
Furnace 26 lbs.
Boxed 29 lbs.
Door 19-1/4" 9-1/4" 1/4"
Recess Bezel 20-9/16" 11-1/2" 3/8"
Small Vent 4-7/16" 4-7/16" 1-1/16"
Furnace 39 lbs.
Boxed 46 lbs.
5
PRE-INSTALLATION
A. Identifying The Furnace Location
Failure to obey the following warnings could result in property damage, serious injury, or death:
• Install the Furnace only in a location and position specified in these instructions.
• Provide adequate combustion and ventilation air to the Furnace space, as specified in these instructions.
• Combustion products must be discharged outdoors. Connect this Furnace to an approved vent system only, as specified in
these instructions.
• As specified in these instructions, always install the Furnace to operate within the Furnace’s intended temperature-rise
range, with a duct system that has an external static pressure within the allowable range. Refer to the furnace rating plate.
• Do NOT install the Furnace near tilt-out rooms, slide-outs, and doors (refer to local codes for clearances), in an area where
wires, pipes, or other objects will interfere with the installation or operation of the Furnace, or in an area that is less than 12"
above a water heater (unless a heat shield is installed above the water heater).
• Do NOT install the Furnace directly on combustible flooring that restricts return air. Examples of combustible flooring
include carpet, tile, so material (like vinyl), or other combustible materials other than wood flooring.
• Do NOT install the Furnace where clearance to combustibles cannot be maintained. Excessive exposure to contaminated
combustion air will result in safety and performance-related problems.
The Furnace must be accessible for repairs.
Determining The Installation Type And Clearances Required
• Locate the Furnace near the midpoint of the RV, at least 3' from the gas service regulator, for a single-Furnace application. The
Furnace must be installed through an exterior wall. Spacing of 1/4" to ducting, within 3' of Furnace, must be provided unless
UL-listed, wire-bound, vinyl ducts are used. All ducting material used must be rated for continuous use at a minimum of 200 °F.
• Determine if you are using a horizontal or vertical installation.
• Horizontal Installation: locate the Furnace so that the gas line is at the top or rear of the Furnace.
• Vertical Installation: the Furnace top becomes the right side of the Furnace. Locate the Furnace so that the vent is at the
floor and the gas line is at the right or rear side.
• Identify the clearances required between the Furnace and the building materials surrounding the Furnace to allow for proper
airflow. Use the “Minimum Clearance To Combustibles” and the “Proper Return-Air Inlet Clearance” sections as guidelines.
Minimum Clearance To Combustibles
The minimum clearances allowed between the surface of the Furnace and combustible objects (board, wall, floor, etc) are shown in
the table.
The Furnace CANNOT be enclosed completely using these minimum dimensions.
CLEARANCE TO COMBUSTIBLES* To p Sides Rear
SM. & MED. VERTICAL/HORIZONTAL 1/2" 1/2" 1/2" 0"
Bottom
(To Screw Heads)
LG. VERTICAL/HORIZONTAL 1/2" 1" 1/2" 0"
*Combustibles are carpet, vinyl, tile, plywood, or similar building materials.
6
PRE-INSTALLATION
Proper Return-Air Inlet Clearance
When a furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space
containing the furnace, the return air shall also be handled by duct(s) sealed to the furnace casing and terminating outside the space
containing the furnace. Failure to do so could result in property damage, serious injury, or death.
Furnaces MUST have at least the Minimum Return Air detailed in section “A. Model Specifications” on page 4 and
page 5.
FIG.1
If one wall is close
to the Return-Air
Inlet, there MUST
be at least 2"
clearance from the
TOP or Inlet SIDE.
FIG.2
If 2 or more walls are
close to the Return-Air
Inlet, there MUST be at
least 3" clearance from
the TOP and Inlet SIDE.
Vertical Wall
(Either Side
Of Furnace)
2"
(Vertical Installation)
(Vertical Installation)
3"
3"
2"
Horizontal Wall
3"
Horizontal Wall
Vertical Wall
Vertical Wall
Horizontal Wall
2"
2"
(Horizontal installation)
Horizontal Wall
3"
Vertical Wall
3"
(Horizontal Installation)
7
PRE-INSTALLATION
B. Determining A Door Installation Option And Cutout Sizing
• Determine whether the RV has a standard door, flush door, or small vent configuration.
• Cut an opening through the side wall to fit the door installation option.
Standard Door Installations
FIG.1
17.00
to
12.50"
to
12.63"
Small Standard
Door Cutout
7.25"
to
7.38"
17.00
to
17.13"
Medium Standard
Door Cutout
7.25"
to
7.38"
17.13"
Large Standard
Door Cutout
9.25"
to
9.38"
FloorFloor
Flush Door Installations
FIG.2
15.00
to
15.13"
Small Flush
Door Cutout
Floor Floor
10.00"
to
10.13"
19.75
to
19.88
Medium Flush
Door Cutout
10.00"
to
10.13"
19.75
to
19.88"
Large Flush
Door Cutout
12.00"
to
12.13"
1.375"1.375"1.375"
R 0.50" to 0.63"
R 0.50" to 0.63"
R 0.50" to 0.63"
Small Vent Installations
FIG.3
(RV Wall Panel)
Wall Hole
Floor (Furnace Bottom)
• There is NO door cutout on the outside of the RV for the small vent installation. The cutout is a hole in the side of the RV used to
vent the Furnace outside of the RV.
Access must be provided directly in front of the Furnace on the inside of the RV, for removal of the Furnace during servicing.
2-1/8"
3-1/2"
1-3/4"
8
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