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The purpose of this document is to establish guidelines for determining the critical R134a refrigerant charge for off-road, self-propelled work machines as defined in SAE J1116 and Agricultural Tractors as defined in ANSI/ASAE S390. It will develop a minimum to maximum refrigerant charge range in which the HVAC system can maintain proper operation. Operating conditions and characteristics of the equipment will influence the optimum charge. Since these conditions and characteristics vary greatly from one application to another, careful consideration should be taken to determine the optimum R134a refrigerant charge for the HVAC system.

This SAE Recommended Practice establishes a uniform test procedure for evaluating performance of operator enclosure pressurization systems for construction, general-purpose industrial, agricultural, forestry, and specialized mining machinery as categorized in SAE J1116 for off-road, self-propelled work machines.

The purpose of this Information Report is to establish minimum performance levels in the operator's environment for heated, ventilated, and air- conditioned construction and industrial equipment cabs. Also established are heating and air-conditioning test procedures for determining operator environment temperature, humidity, and pressurization. Note: The subject of noise is not treated in this information Report. This Information Report establishes the minimum performance levels in the operator's environment: Minimum cab pressurization and ventilation levels under all conditions of heating, air conditioning, and ventilation. Maximum humidity and minimum temperature differential under air conditioning operation. minimum temperature differential under heater operation. The report also establishes uniform test procedures for determining minimum performance levels, as defined under 2.1.1- 2.1.3, under Heater and Air conditioner operation.

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.

SAE J3078/6 specifies a test method for simulating solar heating in the laboratory and measuring the radiant heat energy from a natural or simulated source. It is applicable to off-road self-propelled work machines as defined in SAE J1116 and tractors and machinery for agriculture and forestry as defined in ANSI/ASAE S390.

SAE J3078/3 establishes a uniform test procedure for evaluating performance of operator enclosure pressurization systems. This standard is applicable to off-road, self-propelled work machine, as defined in SAE J1116, and includes tractors and machinery for agriculture and forestry as defined in ASABE standard ANSI/ASAE S390.

SAE J3078/2 specifies two uniform test methods to determine performance levels for fresh and recirculation air filters used in operator enclosures with an air ventilation system. It is not applicable for testing vapor and gas filters. The category of machines covered include off-road self-propelled work machines as defined in SAE J1116 and tractors and machinery for agriculture and forestry as defined in ANSI/ASAE S390.

SAE J3078 provides test methods and criteria for the evaluation of the operator enclosure environment in earth-moving machinery as defined in ISO 6165. SAE J3078/1 gives the terms and definitions which are used in other parts of SAE J3078. It is applicable to Off-Road Self-Propelled Work Machines as defined in SAE J1116 and tractors and machinery for agriculture and forestry as defined in ANSI/ASAE S390.

SAE J3078/2 provides a test method to determine filter performance for fresh and recirculation air filters used in operator enclosures with an air ventilation system. SAE J3078/2 is not applicable for testing vapor and gas filters. The category of machines covered includes off-road self-propelled work machines as defined in SAE J1116 and tractors and machinery for agriculture and forestry as defined in ASABE standard ANSI/ASAE S390.

These general operator precautions apply to off-road work machines as defined in SAE J1116, JUN85, Categories one, two, four and five and agricultural tractors in Category three. These should not be considered as all inclusive for all specific uses and unique features of each particular machine. Other more specific operator precautions not mentioned herein should be covered by users of this recommended practice for each particular machine application.

This SAE Recommended Practice establishes a uniform test procedure for evaluating performance of operator enclosure pressurization systems for construction, general-purpose industrial, agricultural, forestry, and specialized mining machinery as categorized in SAE J1116 for off-road, self-propelled work machines.

The purpose of this document is to establish air conditioning design guidelines that will apply to most systems rather than the specific design of any particular system. Operating conditions and characteristics of the equipment will determine the design of any successful system, and since these characteristics and conditions vary greatly from one application to another, the designer must determine the goals expected to be reached under the conditions encountered. To determine the capacity of such items as blowers, condenser fans, condenser coils, evaporator coils, filters, compressors, etc., will require the adherence to several guidelines, some of which are outlined in the following paragraphs.

This recommended practice provides technicians with safe and efficient techniques and general equipment recommendations for servicing Mobile Air Conditioning (MAC) systems into Off-Road Self-Propelled Work Machines as defined in SAE J1116 and Tractors and Machinery for Agriculture and Forestry as defined in ANSI/ASAE S390. Both refrigerants R 134a and R-1234yf are covered. Many service procedures are similar for both refrigerants but recovery, recycling, charging, electronic leak detection and other tools can be unique to each refrigerant.