Environmental control unit drain means

Claim 1

In a vehicle cab including an air conditioning system and being of a type including an operators enclosure, an environmental control unit including a housing contiguous with the enclosure and having outlet passage means opening thereinto and having inlet passage means located for allowing outside air to pass into the housing, a blower fan located in the housing for drawing air in said inlet passage means and for forcing air out said outlet passage means, an evaporator means located in the housing between the blower and inlet passage means, a filter located in the housing between the inlet passage means and the evaporator means, a compartment located below said evaporator means for collecting condensation and a drain tube having an upper end connected in fluid communication with the bottom of the compartment and having a lower end positioned exteriorly of the housing at a level below the compartment, the improvement comprising: said drain tube being reversely bent between its upper and lower ends and held in place by a bracket means fixed to the exterior of the housing whereby a column of condensate will accumulate in the drain tube so as to prevent air from being drawn therethrough due to any vacuum condition which might occur in the housing due to the operation of the blower fan and filter.