School Bus Specifications - Texas Department of Public Safety

AIR CONDITIONING TEST (continued)2. The A/C system shall be manually controlled from the driver’s area. The air conditioningsystem must be capable of lowering the inside temperature from 110º F maximum (100º Fminimum) and a humidity rating no less than fifty (50) percent to a comfort range of 30º Fcooler than the outside ambient temperature plus or minus 3º F in thirty (30) minutes orless with all the doors and windows closed and the main engine operating at three fourths(3/4) of maximum rated RPM, tested in a controlled facility environment. Measurements willbe taken four (4) feet above the floor along the aisle at the following locations:a. Driver’s seatb. In the center or mid point of the busc. Over the rear drive axled. None can be in the direct path of the air exiting the evaporator3. After the inside temperature has reached a uniform saturation of 110º F maximum (100º Fminimum), all doors, windows and vents will be closed and the air conditioning test willbegin. The main drive engine may be operated up to three fourths (3/4) of the maximumRPM, controlled by a throttle regulator. The inside temperature at the driver’s seat, midpoint,and at the rear of the bus will be monitored throughout the test period. Exteriortemperature will be at an average 110º F maximum (100º F minimum) and be monitoredfor the test duration. Outside test instruments shall be mounted at the bumper and/orfender on the four “corners” of the bus body.4. After thirty (30) minutes the inside temperatures must attain the comfort range of 30º Fcooler than the outside ambient temperature plus or minus 3º F at all three (3) pointsidentified above. Temperature will be measured in five (5) minute increments, inside andoutside of the bus. No single probe will vary more than 5º F. Measurements will berecorded and held for review by prospective purchasers.5. Manufacturer may have a representative present during the test for observation purposesonly. Results of the air conditioning test will be available to the purchaser in advance of thebid opening.AIR CONDITIONING SYSTEM1. Vendor shall include a stamped metal data plate under the hood indicating the type andquantity of refrigerant used for each unit installed. A second copy of the information shallbe 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 refrigerantcapacities within each system on the vehicle, i.e., “curbside system capacity” and “streetsidesystem capacity”. Each air conditioning unit shall be affixed a stamped metal dataplate. The data plate shall include the following information:a. Name and address of the manufacturerb. Modelc. Compressord. Condensere. 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 witha drier with two (2) back-seated valves.Section E-2