17
P-40 RETURN
AIR
Return Air - The cabinet that the furnace may be installed in will have louvers or openings for the return air back to the
furnace. When the furnace is installed, it is imperative that the return air louvers on the furnace cabinet opening are not
obstructed.
Usually, these furnaces are installed under a counter, sofa or bed in order to be out of the way. A grille or opening must be built
into the cabinetry or into the base area of the sofa or bed. Return air from the living area of the trailer is drawn in through the
grille and into the return air openings in the furnace cabinet. Figure 19 illustrates the return air circulation of the furnace. Note:
Refer to the installation manual for the minimum return air area for your specific furnace model.
Insufficient return air will cause the furnace to overheat and cycle on limit. Another symptom of a return air problem is:
1. Furnace seems to run continuously in an effort to satisfy the thermostat.
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