General Service Inform ation. Suburban SFV-42F, NT-24SP, SH-35, P-30S/40, P-40, SF-35, SH-42F, NT.12SE, SFV-42, NT.16SE

GENERAL SERVICE INFORMATION

Suburban DYNATRAIL furnaces installed in recreational vehicles are classified as Direct Vent Sealed Com bustion

Furnaces. A forced draft furnace utilizes a sealed com bustion cham ber which is vented to the outside atm osphere.

The intake air for com bustion is also taken from outdoors and is com pletely isolated from the room air. A m otor is used to drive an im peller wheel to draw intake air into the cham ber to support com bustion and force the exhaust gases through the furnace cham ber to the outside atm osphere. A second im peller wheel (driven by the sam e m otor yet totally isolated from the com bustion air) is used to circulate room air across the furnace cham ber 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 m odels.

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 m odel” trailers operates on 120 volts AC. These are designed and tested under the sam e standards as the 12-volt m odels.

Suburban forced draft com bustion 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 attem pt to convert such a unit to natural gas unless the conversion is approved by the m anufacturer of the furnace.

Gas Supply Pressure Requirem ents

Line Pressure:

Minim um 11" W C*, Maxim um 14" W C

*W C - water colum n

Voltage Requirem ents

Voltage DC: 12 volt D.C.

Minim um 10.5 volts D.C., Maxim um 13.5 volts D.C.

Service Tools Required

Manom eter gauge/ U-Tube

Volt ohm m eter capable of testing above 15 am ps

Module board tester #641511

Gas leak detector OR approved leak check liquid

Assorted wrenches

Assorted hand tools

Safety glasses

3