One of the most popular leading edge components featured in ACC systems is the Torq-Lok refrigerant plumbing system. Torq-Lok eliminates the refrigerant leaks common in other AC systems.
Why is that important? For absolute reliability. Refrigerant leaks have long been the primary problem behind aircraft vapor-cycle air conditioning. Use of 37° flare fittings, common in automotive systems and many competitive aircraft systems, is unreliable in the high-vibration environment of a helicopter. Air Comm eliminated that flawed design with a unique seal system.
Torq-Lok Refrigerant Fitting
This state-of-the-art system utilizes a face-seal O-ring arrangement that is simple to install. It is virtually impervious to installation or maintenance damage, and provides an absolutely leak-proof seal. Torq-Lok is featured on ACC air conditioners for the Bell 206, NTH, 412, 430, 427 and Agusta A-119. It is scheduled to replace insert O-ring fittings on the Bell 407 air conditioner in 2002, and will be used exclusively on all ACC systems in the future.
Torq-Lok’s positive, leak-free seal is just one of the many innovations found on Air Comm systems which contribute to their high efficiency and remarkably low maintenance requirements.
Retractable Condenser Scoop
Air Comm’s retractable condenser scoop is unique in the industry. Designed for the Bell 206, 407 and 427 and the Agusta A-119, it is located inconspicuously under the fuselage, thus eliminating unsightly sidewall cut-out panels common with competitor systems. The scoop deploys when the air conditioner is activated, and allows ram air to flow across the condenser’s heat exchanger during forward flight. A small supplemental blower aids airflow during ground and hover operations.
ACC utilizes aluminum plumbing to reduce weight and maximize refrigerant containment. Hardline plumbing eliminates permeability sometimes associated with standard automotive-type refrigerant hoses used by competitive manufacturers. Hardline plumbing also maintains aircraft component quality that customers expect in modern turbine helicopters.
Refrigerant Bypass System
The ACC refrigerant bypass system was developed to eliminate compressor clutch cycling. The bypass improves temperature control and extends compressor and belt life significantly.
How does it work? The bypass system senses evaporator temperature. When it reaches the point designated by the cockpit temperature control knob, the bypass valve opens and refrigerant bypasses the evaporators and is returned to the compressor to repeat the cycle. This occurs until the evaporator coil temperature rises above the set-point. The bypass valve closes and the refrigerant completes its cycle through the cockpit and cabin evaporators.