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February 26, 2010  |   Comments (1)   |   Post a comment

Technology Showcase: A/C Systems

Here, we provide details on a variety of innovative school bus air conditioning offerings from six manufacturers.


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Trans/Air's new EC 4.0 school bus climate control system will properly sense the temperature in the return air stream for accurate temperature control.

Trans/Air's new EC 4.0 school bus climate control system will properly sense the temperature in the return air stream for accurate temperature control.

Trans/Air Mfg.

The Trans/Air FM55 flush mounted evaporator, conservatively rated at 55,000 BTU/hr (65,000 IMACA), has become one of the company's most popular models for the school bus market. In a Type A bus, one FM55 is commonly used in addition to a driver's factory system. For the Type C bus, two evaporators — one in the front and one in the rear bulkhead
— are utilized for more capacity.

The FM55 was designed specifically for the school bus market in early 2000 to get the evaporator out of the passenger area. It is designed to preclude the possibility of students or aides hitting their head on an evaporator that hangs down from the ceiling. Four thumb screws provide easy access to the oversized inlet filter and other service items, making
the FM55 popular among service managers and mechanics, Trans/Air says.

The company's new R120 roof top condenser assembly utilizes the latest parallel flow aluminum condenser technology. Benefits include greater capacity to reject heat and a 40-percent reduction in weight. The dual circuited assembly can be used with two independent systems in one
bus. The R120 is also easy to mount, since it is designed to fit the curvature of the most popular school and commercial buses.

Trans/Air also offers the EC 4.0 control system. This new school bus climate control system combines the functions of the EC 3.0 multiplexed electrical system and the EC 2.5 electro-mechanical control system into one feature-rich and functional package. The EC 4.0 system includes compressor protection features (cycling and voltage protection) and will
properly sense the temperature in the return air stream for accurate temperature control. 

 


 

Thermo King's ShuttleAire S-30 II environmental control systems meet a wide range of applications, including small buses, and are engineered for reliability, low maintenance and high performance.

Thermo King
Thermo King's ShuttleAire S-30 II is a series of environmental control systems for small vehicles. The product line meets a wide range of applications, including small buses, vans, ambulances, security vehicles and special-purpose vehicles. The S-30 II is supported by a worldwide service organization and is engineered for reliability, low maintenance
and high performance for the life of the vehicle.

Standard features of the S-30 II include heavy-duty fin and tube coils and R-134a refrigerant. Version 1000 (cool only) is rated at 24,908 BTU/hr, with a maximum of 30,026 BTU/hr. Version 1004 (cool and heat) has 9 percent less cooling capacity than Version 1000.

Thermo King also offers the ShuttleAire SR-50, a lightweight, one-piece rooftop system for mid-size applications. Features include a side duct or unique center duct discharge system, heavy-duty fin and tube coils, and the ClimaAIRE control system for optimum temperature control.

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need a quote on a complete a/c system for a 1997 school bus , 21' body 16 seat rows, wolfington body with ihc chassis, t444e engine 7.3 international.. looking for complete system to be installed by my crew . no. 352-621-7503 thank you!

larry smith    |    Apr 09, 2013 08:22 AM

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