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FurnaCE inTrODuCTiOn
Suburban furnaces installed in recreational vehicles are classified as Direct Vent Sealed Combustion Furnaces. A forced
draft furnace utilizes a sealed combustion chamber which is vented to the outside atmosphere. The intake air for combustion
is also taken from outdoors and is completely isolated from the room air. A motor is used to drive an impeller wheel to draw
intake air into the chamber to support combustion and force the exhaust gases through the furnace chamber to the outside
atmosphere. A second impeller wheel (driven by the same motor yet totally isolated from the combustion air) is used to
circulate room air across the furnace chamber where it is heated. The blower then forces the hot air into the living area
either through a duct system or through a front grille on the furnace cabinet on direct discharge models.
Suburban furnaces operate on 12-volt DC power which is supplied either by a 12-volt battery or a converter system. A
recreational vehicle furnace that is specifically designed for “park model” trailers operates on 120 volts AC. These are
designed and tested under the same standards as the 12-volt models.
Suburban forced draft combustion furnaces used in recreational vehicles are designed for use with Propane gas. Although
a few recreational vehicle furnaces are approved for use with natural gas, one should never attempt to convert such a unit
to natural gas unless the conversion is approved by the manufacturer of the furnace.
NOTE: Our Service technicians are available to assist you in making repairs or parts replacements from 8:00 AM to
5:00 PM Eastern Standard Time, Monday through Friday (except holidays), by calling 423-775-2131 EXT 7102. Email
address: [email protected]
MODEl & SErial nuMbEr inFOrMaTiOn
Model and Serial Numbers for Suburban Furnaces are located on a Data Plate attached to the furnace assembly. Below
is an example:
MODEl nO. / nuMÉrO DE MODÉlE
SF-35F
SErial nO./ nuMÉrO DE SÉriE
093102771
STOCK NO.
2332
INPUT BTU/HR.
35,000 @
DEBIT
10.0” W.C.
CALORIFIQUE
OUTPUT BTU/HR.
27,300
CLARIFIQUE
MANIFOLD PRESSURE
10.0” W.C.
PRESSION TUBULURE
ORIFICE SIZE
#51
DIMENSION DE L’INJECTEUR
TYPE OF GAS
LP
ESPECE DE GAZ
MODEl brEaKDOWn
SF-35F
Suburban Furnace
35,000 BTU
Front Gas
SErial # brEaKDOWn
093102771
Year of MFG (2009)
Week of YR (31)
Sequential SR#(02771)