School Bus Specifications - Texas Department of Public Safety

Tinting (continued):b. Windshield: The windshield shall have a horizontal gradient band (tinted)starting slightly above the driver's line of vision, with approximately ninety (90)percent light transmittance and gradually decreasing to a minimum of seventy(70) percent light transmittance at the top of the windshield, or the entirewindshield shall be tinted to meet the requirements of FMVSS No. 205.Beneficial Options: See Section F, Option 74 for white roof.GENERAL PERFORMANCE REQUIREMENTSThe method to determine a uniform guideline for air conditioning systems in school buses shallconform to the American Society of Heating, Refrigerating, and Air Conditioning Engineers, Inc.,ASHRAE 41.4-1986. Air conditioning systems shall:1. Be furnished to meet the requirements of this specification and shall be themechanical vapor compression refrigeration type.2. Have sufficient power for simultaneous cooling, circulating, and dehumidifying theair.3. Be provided with refrigerant that must be nontoxic, nonflammable, and nonexplosive.4. Be manufactured to conform to the requirements of SAE J639.5. Be of the current year's production.6. Details not specifically defined herein shall be in accordance with the manufacturer'sstandard commercial practice for products of this type.7. Have stand-alone grounding system for evaporator and condenser fan systems.8. Have all power and grounding come directly from the battery.9. All air conditioning systems will conform to this specification.CONTROLSAll air conditioning controls shall be located within the drivers reach while seated and operatingthe vehicle. The controls shall be of the manufactures design with a minimum of three (3)operating speeds, OFF is not considered an operating speed.INSTALLATIONInstalling Dealer: Installation of the air conditioning system(s) shall be by the bus bodycompany or by an authorized manufacturer's air conditioning dealer who normally stocks, sells,installs, and services a unit of the type being furnished.Protection of Components: Any skirt-mounted air conditioning component or componentmounted underneath the bus shall be provided with shielding to protect these components frommud or road debris.Note: NO INSTALLATION OF ANY AIR CONDITIONING UNITS OR SYSTEMS SHALL, UNDERANY CIRCUMSTANCES, VOID THE CHASSIS MANUFACTURER'S ENGINE WARRANTY.TESTINGTesting shall be done by, or at the direction of the Department and/or the receiving schooldistrict or other entity. Tests shall be performed on buses furnished. The air conditioningmanufacturer bears the cost of the initial test. The cost of additional tests shall be theresponsibility of the requester of the test if the air conditioning system has already beencertified as passing the test and passes the retest.Section E-4