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:
In the center or mid point of the bus
Over the rear drive axle
None can be in the direct path of the air exiting the evaporator
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.
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.
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.
AIR CONDITIONING SYSTEM:
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.
Serpentine belt configuration is preferred.
High and low pressure cut out safety switches are required.
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:
Name and address of the manufacturer.
Re-circulation and ventilation of air quantity in (CFM).
The type and quantity of refrigerant used for each system installed.
Alternator (See Section B Chassis)
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