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Dometic DFSD12 Installation Manual
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Dometic DFSD12 Installation Manual

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Models DFSAD12, DFSD12, DFSD16, DFSD20, DFMD16,
DFMD20, DFMD25, DFMD30, DFMD35, DFLD35,
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
Cancer and Reproductive Harm
www .P65Warnings .ca .gov
Read these instructions carefully. These instructions MUST stay with this product.
Rev A
Form No. 33400 01/21
©2021 Dometic Corporation
LaGrange, IN 46761
DF Series Furnace
DFLD40, DFLA35, DFLA40
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.
INSTALLATION
MANUAL
USA & CANADA
SERVICE OFFICE
Dometic Corporation
5155 Verdant Drive
Elkhart, IN 46516
SERVICE CENTER &
DEALER LOCATIONS
Visit:
dometic.com/support

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Summary of Contents for Dometic DFSD12

  • Page 1: Table Of Contents

    INSTALLATION MANUAL 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 .

  • Page 2: Introduction

    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 (hereinafter referred to as “Furnace”) has been certified for installation in a recreational vehicle (hereinafter referred to as “RV”) as an MSP Category III Furnace .
  • Page 3 • 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 .  CARBON MONOXIDE HAZ ARD. Failure to obey the following warnings could result in property damage, serious injury, or death: •...

  • Page 4: General Information

    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 DFSAD12 DFSD12 DFSD16 DFSD20 TYPE OF GAS LP Gas...
  • Page 5 65 in . 65 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 Casing 12"...

  • Page 6: Pre-Installation

    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 . •...
  • Page 7 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 .
  • Page 8 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...
  • Page 9 PRE-INSTALLATION C. Ducting  Failure to obey the following warnings could result in property damage, serious injury, or death: • Do NOT install floor registers within 24" of return-air openings . • Do NOT use undersized ducting, which can cause high-temperature limiting . •...
  • Page 10 PRE-INSTALLATION Air Discharge Configuration Examples The following figures offer a visual representation of the detailed discharge requirements outlined in the “Air Discharge Requirements” tables on page 11 and page 12 . These examples show vertical and horizontal installations, using different Furnace models and ducting options .
  • Page 11 PRE-INSTALLATION Air Discharge Requirements VERTICAL HORIZONTAL OR HORIZONTAL BOTTOM BOTTOM EXIT VERTICAL – USE DUCTS 5" FRONT EXIT EXIT INTO HARD 4" FLEX DUCTS INTO HARD 3, 4 & 5 INTO HARD FLEX DUCTS FLOOR DUCT FLOOR DUCT FLOOR DUCT Minimum CFM DFL40 4"...
  • Page 12 PRE-INSTALLATION HORIZONTAL OR VERTICAL USE 5" FRONT EXIT (DUCTS 3, 4, & 5) OR BOTTOM 4" FLEX DUCTS FLEX DUCTS EXIT INTO HARD FLOOR DUCT Minimum CFM DFS20 Two 4" flex ducts – One 5" OR two 4" ducts DISCHARGE one each from the left and right side, based (5"...
  • Page 13 • Place the gasket on the plenum around the floor opening . Plenum plates and gaskets are available for purchase through Dometic . If not using a Dometic gasket and plenum plate, seal the Furnace to the hard ducting system using an approved foil tape, or use a gasket that has a 300° F minimum temperature rating and a UL94-V0 rating .
  • Page 14 PRE-INSTALLATION Standard Door Floor Discharge Installations The dotted lines around the knockouts in the figures represent the floor-hole position . FIG. 1 5" 5" 10" 2.2" 1.2" 3.5" Medium & Large Large Door Medium Door 4" Door Horizontal Vertical Install Vertical Install Install 9.75"...
  • Page 15 If a knockout is removed accidentally, cover plates are • Securely attach ducting to the duct adapter . If using screws available for purchase through Dometic . to secure the ducting, do not use screws longer than 1/2" . Cover Plate: 31361 D.

  • Page 16: Installation

    . Make sure the vent assembly is aligned with the Dometic text at the TOP . • Secure the vent assembly to the door using four stainless steel exhaust screws (provided with the door) .
  • Page 17 • Bend the casing tabs to the outside of the bezel . tube with the Dometic text aligned at the TOP . • Align the top three holes on the bezel with the holes in the •...
  • Page 18 . • Align the vent assembly (provided) over the vent extension so that the Dometic text is at the TOP . • Push the vent assembly into the chamber tube and secure using four stainless steel exhaust screws (not provided) .
  • Page 19 Mounting brackets can be attached to the Furnace casing by removing an existing casing screw, ONLY with prior approval from Dometic . When securing the Furnace, it MUST be accessible and easily removed for service . E. Running the Ductwork STEP 1...
  • Page 20 INSTALLATION F. Connecting The Gas  FIRE OR EXPLOSION HAZ ARD . Failure to obey the following warnings could result in property damage, serious injury, or death: • Install gas connections in compliance with the applicable supplemental directives listed in this manual . Refer to “C .
  • Page 21 INSTALLATION G. Converting The Furnace Gas Type This section applies to DFLA35 and DFLA40 models only . These models are set up for LP gas at the factory, but can be converted to natural gas . A natural gas conversion kit is included .  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 .
  • Page 22 INSTALLATION H. Connecting The Electrical  ELECTRICAL SHOCK HAZARD . Failure to obey the following warnings could result in property damage, serious injury, or death: • The Furnace must be electrically grounded in accordance with local codes, or in the absence of local codes, with the National Electrical Code, ANSI/NFPA 70, and/or the Canadian Electrical Code, CSA C22 .
  • Page 23 INSTALLATION Wiring Diagrams FIG. 1 FIG. 2 (12 VDC) (12 VDC) Valve Limit Switch N.C. Sail Switch Blue N.O. Motor Blue Blue Ignition Valve Control Ignition Control Black Sail Switch Black Electrode Limit Switch N.C. Black Thermostat Motor Switch/Breaker Electrode 12 Volts DC FIG. 3 FIG. 4 (120 VAC)

  • Page 24: Testing

    INSTALLATION I. Installing The Thermostat  Do NOT install the thermostat where there are other heating loads, such as direct sunlight, heat-producing appliances (television, radio, wall lamp, etc .) Furnace, or air conditioner output registers . Failure to follow these instructions could result in serious injury or death .

  • Page 25: Troubleshooting

    2 . Check the air intake to make sure it is not blocked or obstructed . REPLACEMENT PARTS  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: •...
  • Page 28 Mobile living made easy. dometic.com YOUR LOCAL YOUR LOCAL YOUR LOCAL DEALER SUPPORT SALES OFFICE dometic.com/dealer dometic.com/contact dometic.com/sales-offices...

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