Engine Idling, Discharge Lines | BENDIX TCH-008-021 instruction

Technical Bulletin

Bulletin No: TCH-008-021

Effective Date: 3-5-2010

Cancels: PRO-08-21 dated 2-6-2008

Page: 1 of 2

Subject: Air Brake System - Cold Weather Operation Tips

As the cold weather approaches, operators and ﬂeets alike begin to look to their vehicles with an eye toward “winterization”, and particularly what can be done to guard against air system freeze-up. Here are some basic “Tips” for operation in the cold weather.

Engine Idling

Avoid idling the engine for long periods of time! In addition to the fact that most engine manufacturers warn that long idle times are detrimental to engine life, winter idling is a big factor in compressor discharge line freeze-up. Discharge line freeze-ups account for a signiﬁcant number of compressor failures each year. The discharge line recommendations under “Discharge Lines” are important for all vehicles, but are especially so when some periods of extended engine idling can not be avoided.

Discharge Lines

The discharge line should slope downward from the compressor discharge port without forming water traps, kinks, or restrictions. Cross-overs from one side of the frame rail to the other, if required, should occur as close as possible to the compressor.

Dryer Inlet Temperature

The dryer inlet air temperature should typically be within the range of no more than 160°F and no less than 45°F above low ambient (surrounding) temperature to prevent freeze-ups. (For example, if low ambient is minus 40°F, the dryer inlet must be above 5°F.) Lower dryer inlet temperatures should be avoided to minimize the risk of freeze-up upstream of the air dryer. Higher temperatures should also be avoided to minimize the risk of heat damage to the air dryer seals and to avoid a loss of drying performance.

Compressor Line Size

The line size and length is established by the vehicle manufacturer and should not be altered without the vehicle manufacturers approval. As a reference, the line length from the compressor to the air dryer should be less than

16 feet and the minimum line sizes should be as follows:

Minimum	Minimum	Application
Length	I.D.
6 ft.	1/2 in.	Low Compressor Duty Cycle Applications (0-20%)
10 ft.	5/8 in.	High Compressor Duty Cycle Applications (20-40%)

Line Insulation

To guard against freez-ups in Low Duty Cycle applications, the discharge line can be insulated if it is greater than 9 feet in length. The line can only be insulated back to 9 feet and a maximum of 3 feet. For example, if the line is 10 feet, insulate the ﬁtting and the last one foot of the line. If the line is 15 feet, insulate the ﬁtting and the last 3 feet of the line.

TCH-008-021 specifications

The BENDIX TCH-008-021 is a prominent component in the realm of heavy-duty braking systems, specifically designed for commercial vehicles and trailers. This advanced trailer control valve plays a critical role in managing the braking aspect in vehicles equipped with air brake systems, ensuring safety, reliability, and optimal performance during various driving conditions.

One of the main features of the BENDIX TCH-008-021 is its dual-function design that incorporates both a spring brake control and a trailer brake control feature. This dual functionality allows for effective engagement of the trailer's braking system, making it an essential component for fleet operators and truck drivers who frequently handle heavy loads. The control valve is designed to offer enhanced responsiveness, which translates into improved braking performance, especially during sudden stops or emergency situations.

The technology behind the BENDIX TCH-008-021 is rooted in precision engineering. The valve is constructed from high-quality materials to withstand the rigors of harsh operating environments. It features a robust housing that is resistant to corrosion, ensuring a long operational life. Additionally, the valve utilizes advanced sealing technologies to prevent leaks and maintain optimal pressure within the braking system, thereby enhancing overall safety.

Another characteristic worth noting is the ease of installation and maintenance of the BENDIX TCH-008-021. This feature simplifies the process for technicians performing repairs or routine inspections, leading to reduced downtime and improved vehicle availability. The valve is compatible with a range of braking systems, making it a versatile choice for various vehicle models and configurations.

In conclusion, the BENDIX TCH-008-021 is a reliable and efficient trailer control valve that embodies the cutting-edge technologies and engineering standards synonymous with the BENDIX brand. With its dual-functionality, high-quality construction, and ease of maintenance, it stands out as a preferred choice for professionals seeking to enhance the safety and efficiency of their braking systems in heavy-duty applications. The commitment to excellence in design and performance makes the BENDIX TCH-008-021 a key component for those who demand the best in their commercial vehicles.

BENDIX TCH-008-021 manual Engine Idling, Discharge Lines, Dryer Inlet Temperature

Models: TCH-008-021