Maintenance - Suburban DD-17DSI Service Manual

Preventative m aintenance is essential if an RV owner is to have reliable, safe operation of his furnace. Two im portant areas
to watch closely in order to assure safe, reliable operation are the venting and the m ain burner.
An obstruction in the vent or m ain burner will reduce the com bustion air which results in incom plete com bustion. W henever
incom plete com bustion occurs, the by-products are carbon m onoxide (CO) and soot. If the furnace outside exhaust vent shows
black soot form ing, the furnace should not be operated until the problem is corrected. Two com m on causes are:
1. Restriction in the vent or furnace intake (screens, wasp nests, tape).
2. Dirty burner.
If operation of the furnace continues under these conditions, it could result in serious injury to the occupants of the RV or even
death.
Cleaning of the m ain burner and an inspection of the venting system should be done at least once a year, preferably just before
the beginning of the heating season. Som e RV owners and service personnel have the false assum ption that if a furnace has
not been used, it will not require cleaning. NOT SO! A furnace which has not been used for som e tim e could be m ore in need
of cleaning than a furnace which has been used extensively.
Dust and lint should be rem oved from the room air blower wheel and sail switch. A build up of dust and lint on the blower wheel
can cause the m otor to drag and not generate enough air flow to engage the sail switch. Dust accum ulation on the sail switch
will restrict the travel of the actuator arm to where the air flow across the paddle will not sail it in and com plete the valve circuit.
A yearly inspection should be m ade of all gaskets on the furnace. If any gaskets show signs of leakage or deterioration, they
m ust be replaced.
Figure 34
Figure 36

MAINTENANCE

39
Figure 35
Figure 37