Off-Road Self-Propelled Work Machines Operator enclosure environment Part 4:Heating, ventilating and air conditioning (HVAC) test method and performance


J3078/4 specifies a uniform test method for measuring the contribution to operator environmental temperature provided by a heating, ventilating and air conditioning system operating in a specific ambient environment. The method might not determine the complete climatic environment of the operator since this is also affected by heat load from sources other than those on the machine, for example solar heating. J3708/6 is to be used in conjunction with J3078/4 to determine more accurately the complete heat loading on the operator enclosure. Minimum performance levels for the machine’s operator enclosure heating, ventilating and air conditioning systems are established in J3708/4.


There are currently 2 ISO documents and several J documents covering test procedures relating to operator enclosure environment. The ISO documents are basically several J documents combined into the ISO format. Technical content of all these documents was prepared by SAE SC6. This new document will contain the same technical content as the other documents but can be applied to vehicles not covered by the ISO documents. Several J documents will be replaced. Changes to the technical content of this new document will be controlled by SAE SC6. Since the format of the new document will be the same as the ISO format, it will be simpler for the SAE liaison group to present any changes to ISO.

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