DOMETIC DFSAD12 Small Furnace (12k-20k) BTU Installation Guide

: June 7, 2024
: Dometic

Table of Contents

INTRODUCTION
IMPORTANT SAFETY INSTRUCTIONS AND DOCUMENT SYMBOLS
OPERATION
INSPECTION AND MONTHLY MAINTENANCE
ANNUAL MAINTENANCE
TROUBLESHOOTING
REPLACEMENT PARTS
LIMITED TWO-YEAR WARRANTY
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

DOMETIC DFSAD12 Small Furnace (12k-20k) BTU Installation Guide

$DOMETIC DFSAD12 Small Furnace $12k-20k$ BTU Installation Guide$

WARNING: FIRE OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly could result in serious injury, death, or property damage.

WARNING: If the information in these instructions 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

Do not try to light any appliance.
Do not touch any electrical switch; do not use any phone in your building.
Leave the building immediately.
Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
If you cannot reach your gas supplier, call the fire department.
– Installation and service must be performed by a qualified installer, service agency, or the gas supplier.

WARNING
Cancer and Reproductive Harm www.P65Warnings.ca.gov

Read these instructions carefully. These instructions MUST stay with this product.

USA & CANADA SERVICE OFFICE Dometic Corporation 5155 Verdant Drive Elkhart, IN 46516

SERVICE CENTER & DEALER LOCATIONS Visit: dometic.com/support

INTRODUCTION

This manual is intended for reference on the safe operation and maintenance of the Dometic DF Series Furnace. Should you require further information, contact Dometic. This DF Series Furnace (hereinafter referred to as “Furnace”) has been certified and designed as an MSP Category III Furnace and is intended for use inside a recreational vehicle (hereinafter referred to as “RV”). Follow these instructions to ensure the correct operation and maintenance of the Furnace. Failure to operate and maintain the Furnace according to these operating 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.
WARNING indicates a hazardous situation that, if NOT avoided, could result in death or serious injury.
CAUTION indicates a hazardous situation that, if NOT avoided, could result in minor or moderate injury.
NOTICE 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
ANSI Z21.47-2016
ANSI Z21.86-2016

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
CSA 2.3-2016 · CSA 2.32-2016

D. General Safety Messages
Warnings FIRE OR EXPLOSION HAZARD. Failure to obey the following warnings could result in property damage, serious injury, or death:

Do NOT store gasoline, oil- or gasoline-soaked rags, or other flammable vapors and liquids inside storage compartment(s).
BEFORE refueling or parking near a gasoline pump, make sure ALL liquid propane (LP) gas appliances (vented to the outside of the RV) are shut OFF. Otherwise, fumes from gasoline pumps could come into contact with an LP gas appliance burner flame and ignite.
Turn OFF LP gas supply at the tank.
Keep the Furnace area free and clear of insulating material, as insulating materials may be combustible. Examine the Furnace area after installation or when insulation is added.
Use only with the type of gas approved for the Furnace. Refer to the Furnace rating plate.
All DFSA, DFS, DFM, and DFLD models: LP ONLY
All DFLA models: LP or Natural Gas
Do NOT overfill LP gas tanks. LP tanks must be filled by a qualified gas supplier only. Follow the tank manufacturer’s operating instructions located on the tank.
Immediately shut down the Furnace and call a service agency if the Furnace cycles erratically or delays on ignition.
Shut OFF the gas valve to the Furnace before shutting off the electrical supply if the gas supply fails to shut off, or if overheating occurs.

WARNING CARBON MONOXIDE HAZARD. Failure to obey the following warnings could result in property damage, serious injury, or death:

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.
Do NOT operate the Furnace if venting into a room enclosure with the privacy panels closed. At least one panel MUST be open for ventilation when using the Furnace.
Doors MUST be properly sealed and the draft 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, so that all combustion air supplied to the burner is drawn from the outside atmosphere.

WARNING ELECTRICAL SHOCK HAZARD. Failure to obey the following warnings could result in property damage, serious injury, or death:

Furnaces with 12 VDC connection are for low-voltage battery or direct current only. Do NOT connect to 120 or 240 VAC.
This Furnace is 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 battery charger to supply power to DC model Furnaces even when testing.

WARNING CRITICAL INSTALLATION WARNINGS. Failure to obey the following warnings could result in property damage, serious injury, or death:

This Furnace MUST be installed, repaired, and serviced by a qualified service technician.
Do NOT modify this Furnace in any way. Modification can be extremely hazardous.
Do NOT use the Furnace cabinet area as a storage compartment.
Do NOT keep insulating material, clothing, or flammable material on or near the Furnace.
Do NOT use for temporary heating of buildings or structures under construction.
Do NOT use the Furnace if any part has been under water.
Do NOT use petroleum or citrus-type cleaner on plastic parts, as damage may occur.
Do NOT restrict the ducting or block Furnace outlet registers and return-air grills.
Do NOT install screens over the intake air or exhaust vents for any reason.
Do NOT install air boosters in the duct system.
Do NOT touch exterior exhaust grills when the Furnace is operating.
Supervise young children who are in the same room as the Furnace.
All 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.
Use only Dometic replacement parts and components, which are specifically approved for use with the Furnace.

OPERATION

WARNING FIRE OR EXPLOSION HAZARD. Failure to obey the following warnings could result in property damage, serious injury, or death:

This Furnace does not have a pilot. It is equipped with an ignition device that automatically lights the burner. Do NOT try to light the burner by hand.
BEFORE OPERATING THE FURNACE, check around the Furnace area and floor for the smell of gas and check the fitting with a leak test solution. Do NOT proceed if a gas odor exists around the Furnace or floor area. Follow the instructions in the warning box on the cover page.
Turn the gas control valve by hand ONLY. NEVER use tools. If the valve does not turn by hand, do NOT attempt to repair it. Call a qualified service technician.

Read the following BEFORE proceeding:

During the initial firing of the Furnace, a burn-off of excess paint and oils remaining from the manufacturing process may cause “smoking” for 5 10 minutes.
The Furnace is equipped with a power switch. Gas will not flow to the burner and the Furnace will not operate with the switch in the OFF position.
Door models have a power switch located inside of the door.
Non-door models (LD or Small Vent) have a power switch on the outside of the Furnace.

A. Turning On The Furnace

$DOMETIC DFSAD12 Small Furnace $12k-20k$ BTU Installation Guide - Figure 1$ $DOMETIC DFSAD12 Small Furnace $12k-20k$ BTU Installation Guide - Figure 2$

Turn the thermostat to the lowest setting.
Turn OFF all power to the Furnace at the main power supply.
At the exterior access panel, turn the switch on the Furnace to the OFF position.
Wait five minutes, then check for a gas odor.
If a gas odor exists around the Furnace or floor area, follow the instructions in the warning box on the cover page.
If no gas odor is present, proceed to the next step.
At the exterior access panel, turn the switch on the Furnace to the ON position.
Turn ON the main power supply.
Set the thermostat to the desired temperature.

If the Furnace will not operate, follow the instructions for “B. Turning Off The Furnace” on page 5 and call a qualified service technician.

B. Turning Off The Furnace

$DOMETIC DFSAD12 Small Furnace $12k-20k$ BTU Installation Guide - Turning Off The Furnace$

Set the thermostat to the lowest setting, then turn to the OFF position.
Turn the manual shut-off valve at the LP tank (if equipped) to the OFF position. Do NOT force the valve.
At the exterior access panel, turn the switch on the Furnace to the OFF position.

INSPECTION AND MONTHLY MAINTENANCE

WARNING ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. Failure to obey the following warnings could result in dangerous operation, property damage, serious injury, or death:

Never attempt to repair the Furnace yourself. Contact a qualified service technician.
Improper servicing could result in dangerous operation, serious injury, death, or property damage.
Before servicing, disconnect all electrical power to the Furnace. · When servicing the controls, label all the wires prior to disconnecting. Reconnect the wires correctly.
Verify proper operation after servicing.
Keep the Furnace, control compartments, burners, and circulating air passageways clean and unobstructed. More frequent cleaning may be required from excessive lint from carpeting, bedding materials, pet hair, etc.
Do NOT use petroleum or a citrus-type cleaner on plastic parts, as damage may occur.

NOTICE The motor is permanently lubricated and requires no oiling.

A. Servicing And Maintenance
Annual inspections should be performed by a qualified service technician.

$DOMETIC DFSAD12 Small Furnace $12k-20k$ BTU Installation Guide - Servicing And Maintenance$

B. Inspecting The Vents And Exhaust Tubes

$DOMETIC DFSAD12 Small Furnace $12k-20k$ BTU Installation Guide - Inspecting The Vents And Exhaust Tubes$

Inspect the Furnace venting. Confirm the vents properly expel exhaust into the atmosphere and that the vent assembly is positioned tightly against the outer door.
Inspect the vent for obstructions or the presence of soot. If soot is present, immediately shut the Furnace OFF and contact your dealer or a qualified service technician.
- Inspect the Furnace exhaust tubes for blockage, overlap, holes, or soot.
- All exhaust system tubes MUST overlap no less than 1-1/4″.
- All air intake tubes MUST overlap no less than 1/2″. · Keep tubes clean and free of obstructions.

C. Inspecting The Chamber

$DOMETIC DFSAD12 Small Furnace $12k-20k$ BTU Installation Guide - Inspecting The Chamber$

Inspect the chamber and vent system for holes or excessive corrosion.

D. Inspecting The Base
$DOMETIC DFSAD12 Small Furnace $12k-20k$ BTU Installation Guide - Inspecting The Base$

Confirm the Furnace mounting base is not sagging or deteriorating.

E. Inspecting The Vent Assembly

$DOMETIC DFSAD12 Small Furnace $12k-20k$ BTU Installation Guide - Inspecting The Vent Assembly$

Inspect the Furnace, venting, ducting, and gas piping for obvious signs of deterioration. Correct any defects.

ANNUAL MAINTENANCE

WARNING ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. Failure to obey the following warnings could result in dangerous operation, property damage, serious injury, or death:

Improper servicing could result in dangerous operation, serious injury, death, or property damage.
Before servicing, disconnect all electrical power to the Furnace.
When servicing the controls, label all the wires prior to disconnecting. Reconnect the wires correctly.
Verify proper operation after servicing.
Failure to properly maintain the Furnace may void the Furnace warranty and can result in property damage, serious injury, or death.

A qualified RV service technician should perform the following preventative maintenance and safety checks ANNUALLY.

$DOMETIC DFSAD12 Small Furnace $12k-20k$ BTU Installation Guide - ANNUAL MAINTENANCE$

TROUBLESHOOTING

$DOMETIC DFSAD12 Small Furnace $12k-20k$ BTU Installation Guide - TROUBLESHOOTING$

REPLACEMENT PARTS

WARNING ELECTRICAL SHOCK, FIRE, EXPLOSION AND/OR CARBON MONOXIDE HAZARD. Use only Dometic replacement parts and components, which are specifically approved for use with the Furnace. Failure to obey this warning could result in dangerous operation, property damage, serious injury, or death: