INSTALLATION
MANUAL
DF Series Furnace
Models DFSAD12, DFSD12, DFSD16, DFSD20, DFMD16,
DFMD20, DFMD25, DFMD30, DFMD35, DFLD35,
DFLD40, DFLA35, DFLA40
USA & CANADA
SERVICE OFFICE
Dometic Corporation
5155 Verdant Drive
Elkhart, IN 46516
SERVICE CENTER &
DEALER LOCATIONS
Visit:
dometic.com/support
Rev A Form No. 33400 01/21
©2021 Dometic Corporation
LaGrange, IN 46761
INTRODUCTION ............................................................................. 2
IMPORTANT SAFETY INSTRUCTIONS AND DOCUMENT SYMBOLS .................................... 2
GENERAL INFORMATION ...................................................................... 4
PRE-INSTALLATION ........................................................................... 6
INSTALLATION .............................................................................. 16
TESTING ................................................................................... 24
TROUBLESHOOTING ........................................................................ 25
REPLACEMENT PARTS ........................................................................ 25
Read these instructions carefully. These instructions MUST stay with this product.
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
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