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temperature plus or minus 3 º F in thirty (30) minutes or less with all the doors and windows closed and the main engine operating at ¾ of maximum rated RPM, tested in a controlled facility environment. Measurements will be taken four (4) feet above the floor along the aisle at the following locations:

      • a.

        Driver’s seat

      • b.

        In the center or mid point of the bus

      • c.

        Over the rear drive axle

      • d.

        None can be in the direct path of the air exiting the evaporator

    • 3.

      After the inside temperature has reached a uniform saturation of 110 º F maximum (100 º F minimum), all doors, windows and vents will be closed and the air conditioning test will begin. The main drive engine may be operated up to ¾ of the maximum RPM, controlled by a throttle regulator. The inside temperature at the driver’s seat, mid-point, and at the rear of the bus will be monitored throughout the test period. Exterior temperature will be at an average 110 º F maximum (100 º F minimum) and be monitored for the test duration. Outside test instruments shall be mounted at the bumper and/or fender on the four “corners” of the bus body.

    • 4.

      After thirty (30) minutes the inside temperatures must attain the comfort range of 30 º F cooler than the outside ambient temperature plus or minus 3 º F at all three (3) points identified above. Temperature will be measured in five (5) minute increments, inside and outside of the bus. No single probe will vary more than ± 5º F. Measurements will be recorded and held for review by prospective purchasers.

    • 5.

      Manufacturer may have a representative present during the test for observation purposes only. Results of the air conditioning test will be available to the purchaser in advance of the bid opening.

  • C.


    • 1.

      Vendor shall include a stamped metal data plate under the hood indicating the type and quantity of refrigerant used for each unit installed. A second copy of the information shall be included in the delivery folder.

    • 2.

      Serpentine belt configuration is preferred.

    • 3.

      High and low pressure cut out safety switches are required.

    • 4.

      Written documentation, both labeling and the service manual shall describe refrigerant capacities within each system on the vehicle, i.e., “curbside system capacity” and “street-side system capacity”. Each air conditioning unit shall be affixed a stamped metal data plate. The data plate shall include the following information:

      • a.

        Name and address of the manufacturer.

      • b.


      • c.


      • d.


      • e.

        Re-circulation and ventilation of air quantity in (CFM).

      • f.

        The type and quantity of refrigerant used for each system installed.

    • 5.

      Alternator (See Section B Chassis)

    • 6.

      As an option, when requested in the IFB, the air conditioning system shall be supplied with a drier with two (2) back-seated valves. Section E-3

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