2012 Phaeton Owner's Manual - Tiffin Motorhomes

HEATING & AIR CONDITIONINGFurnaceWarningNever attempt to modify the furnace. To do so may cause fire, explosion, carbonmonoxidepoisoning, or asphyxiation. If the furnace is malfunctioning, immediatelyshut the unit “off” and call a trained service technician to make necessary repairs assoon as possible.The Phaeton motor home is equipped with a forced-air furnace fueled by LP gas. The furnace iscontrolled by the wall-mounted, thermostats (Figure 3-1) located inside the motor home (one in the frontof the motor home; the other in the master bedroom)—these thermostats control both the heating andair conditioning for the motor home.In the heating mode, the furnace heats air which, in turn, is circulated through ductwork in the floor ofthe motor home. If any obstruction(s) block the floor vent(s) or airreturnregister, then the furnace will not function properly. Therefore,any items stored under the cabinets should be carefully stowed toprevent damaging or crushing the furnace ducting or blocking thewarm-air return.Figure 3-1. ThermostatWhen a furnace is being used for the first time, there may be an initial“burn-off” of manufacturing compounds or residues left on the heatexchanger or in the ductwork which could produce odors, fumes, andpossibly some smoke. This occurrence is normal and should not causeconcern, unless it persists for an excessive amount of time.To minimize the after-effects of this “burn-off” process, the initial use of the furnace should be donewith all the doors and windows open to permit normal air circulation to dissipate these odors and fumes.For routine operation of the furnace, set the thermostat to the desired temperature setting and then turn“on” the thermostat; in about a minute, the furnace should begin to operate and warm or hot air shouldbe coming through the ductwork.To shut down the furnace, turn the thermostat to the “off” position. Even though the thermostat maybe turned “off,” the furnace system will continue to run for about a minute or so to permit a gradualcool-down of the heating system which is normal.On a regular basis, thoroughly clean the complete furnace and air-tube passageways to remove dust, lint,and any other possible obstructions. Leak-test the entire LP gas system at least annually. Also check andclean the air-blower system annually.3-2