Abstract: A service module has an internal combustion engine to drive an air compressor and/or other equipment. The internal combustion engine has a cooling system including first and second indirect heat exchangers. A housing is provided including a blower, with a fixed baffle in the housing dividing the air output from the blower into first and second paths. The first and second indirect heat exchangers are located on each in the air paths. A three-way valve located in the cooling system directs the cooling fluid to one or the other of the two heat exchangers.

Abstract: A self-contained service module incorporates a water cooled internal combustion engine as a primary power source which drives a low-pressure, high volume forced air ventilation system; a water cooled, high-pressure air compressor; and an alternator. Large diameter steel tubing is utilized as a basic framework for the system and provides a dual function by supporting the primary components of the system and by serving as a reservoir for the high-pressure air. A heat exchange radiator is provided to remove heat from the engine and air compressor cooling liquid and heat the low-pressure air in the ventilation system. When heated air is not required, the radiator is moved to a second position so that air passing therethrough is exhausted from the unit and fresh air at ambient temperatures is provided by the ventilation system.

Abstract: A self-contained service module incorporates a water cooled internal combustion engine as a primary power source which drives a low-pressure, high-volume forced air ventilation system; a water-cooled, high-pressure air compressor; and an alternator. Large diameter steel tubing is utilized as a basic framework for the system and provides a dual function by supporting the primary components of the system and by serving as a reservoir for the high-pressure air. A heat exchange radiator is provided to remove heat from the engine and air compressor cooling liquid and heat the low-pressure air in the ventilation system. When heated air is not required, the radiator is moved to a second position so that air passing therethrough is exhausted from the unit and fresh air at ambient temperatures is provided by the ventilation system.