Standard Bus Procurement Guidelines - APTAStandards.com

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Standard Bus Procurement Guidelines 5.4.7.4.2 Materials Baseline: Use for safety glass glazing panels. Side windows glazing material shall have a 1/4-inch nominal thickness tempered safety glass. The material shall conform to the requirements of ANSI Z26.1 Test Grouping 2 and the Recommended Practices defined in SAE J673. Alternative: Use for polycarbonate glazing panels. Also see Section 5.1.5.2. Side window glazing material shall have a 1/4-inch nominal thickness. The material shall conform with the requirements of ANSI Z26.1-1977 Standard for Type AS-5 Safety Glazing Materials except for Test Number 17 which shall subject the specimens to 1000 cycles and the arithmetic mean of the percentages of light scattered shall not exceed 5 per cent. Windows shall be polycarbonate sheet with an abrasion resistant coating on both sides of the window. Alternative: Use for acrylic glazing panels. Also see Section 5.1.5.2. Side window glazing material shall have a 1/2-inch nominal thickness. The material shall conform with the requirements of ANSI Z26.1-1977 Standard for Type AS-5 Safety Glazing Materials except for Test Number 17 which shall subject the specimens to 1000 cycles and the arithmetic mean of the percentages of light scattered shall not exceed 5 per cent. Windows shall be cell cast acrylic sheet with an abrasion resistant coating on both sides of the window. Windows on the bus sides and in the rear door shall be tinted a neutral color, complementary to the bus exterior. The maximum solar energy transmittance shall not exceed 37 percent, as measured by ASTM E-424, and the luminous transmittance shall be no less than 16 percent as measured by ASTM D-1003. Windows over the destination signs shall not be tinted. 5.4.8 HEATING VENTILATING AND AIR CONDITIONING 5.4.8.1 CAPACITY AND PERFORMANCE The Heating, Ventilation and Air Conditioning (HVAC) climate control system shall be capable of maintaining the interior of the bus at the temperature and humidity levels defined in the following paragraphs. With the bus running at the design operating profile and carrying a number of passengers equal to 150 percent of the seated load, the HVAC system shall maintain a passenger compartment temperature within a range between 65Ε and 80Ε F, while controlling the relative humidity to a value of 50 percent or less. The cooling requirements shall be based on each passenger generating 270 Btu per hour of sensible heat and 270 Btu per hour of latent heat. The system shall maintain these conditions while subjected to any outside ambient temperatures within a range of 10Ε to 95Ε F and at any ambient relative humidity levels between 5 and 50 percent. When the bus is operated in outside ambient temperatures of 95Ε to 115Ε F, the interior temperature of the bus shall be permitted to rise one degree for each degree of exterior temperature in excess of 95Ε. Technical Specifications 182 10/18/07
Standard Bus Procurement Guidelines The air conditioning portion of the HVAC system shall be capable of reducing the passenger compartment temperature from 110Ε to 90Ε F in less than 20 minutes after engine start-up. Engine temperature shall be within the normal operating range at the time of start-up of the cool-down test and the engine speed shall be limited to fast idle that may be activated by an operator-controlled device. During the cool-down period the refrigerant pressure shall not exceed safe high-side pressures and the condenser discharge air temperature, measured 6 inches from the surface of the coil, shall be less than 45Ε F above the condenser inlet air temperature. The bus shall be parked in direct sunlight with ambient temperature at 100Ε F and humidity less than 20 percent. There shall be no passengers on board, and the doors shall be closed. Manually controlled shutoff valves in the refrigerant lines shall allow isolation of the compressor and receiver for service. To the extent practicable, self-sealing couplings shall be used to break and seal the refrigerant lines during removal of major components, such as the refrigerant compressor condenser. The condenser shall be located to efficiently transfer heat to the atmosphere, and shall not ingest air warmed above the ambient temperature by the bus mechanical equipment, or to discharge air into any other system of the bus. The location of the condenser shall preclude its obstruction by wheel splash, road dirt or debris. 5.4.8.2 CONTROLS AND TEMPERATURE UNIFORMITY All interior climate control system requirements shall be attained automatically. The operator shall control only the defroster and operator's heater. The interior climate control system shall switch automatically to the ventilating mode if the refrigerant compressor or condenser fan fails. Temperatures measured from a height of 6 inches below the ceiling shall be within ∀5Ε F of the average temperature at the top surface of the seat cushions. Temperatures measured more than 3 inches above the floor shall be within ∀10Ε F of the average temperature at the top surface of the seat cushions. The interior temperature, from front to rear of the bus, shall not vary more than ∀5Ε F from the average. 5.4.8.3 AIR FLOW 5.4.8.3.1 Passenger Area The cooling mode of the interior climate control system shall introduce air into the bus at or near the ceiling height at a minimum rate of 25 cubic feet per minute (cfm) per passenger based on the standard configuration bus carrying a number of passengers equal to 150 percent of the seated load. This air shall be composed of no less than 20 percent outside air. Airflow shall be evenly distributed throughout the bus with air velocity not exceeding 100 feet per minute on any passenger. The ventilating mode shall provide outside air at a minimum flow rate of 20 cfm per passenger. Airflow may be reduced to 15 cfm per passenger (150 percent of seated load) when operating in the heating mode. Heated air introduced into the bus shall contain no less than 20 percent outside air. The fans shall not activate until the heating element has warmed sufficiently to assure at least 70Ε F air outlet temperature. The heating air outlet temperature shall not exceed 100Ε F under any normal operating conditions. Outside airflow may be cut off during initial warm-up, provided no manual manipulation is required. Technical Specifications 183 10/18/07
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American Public Transit Association
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Standard Bus Procurement Guidelines - APTAStandards.com

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