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Rear Van Conversion Air Conditioner and Heating System
The following is an explanation of the AirTech®II rear van conversion A/C-Heat system built for East Coast Custom Vehicles.
One of the goals East Coast Custom Vehicles had in mind for the design of the AirTech®II system was to improve greatly from the rear van systems then being offered. With the new refrigerant R-134a and developing technologies that are available to us today, it was our desire to engineer a system to perform the following:
Increased cooling performance
Quieter blower motor
Substantially more airflow from vents
We have achieved all the above with the AirTech®II system.
Many of the rear air/heat systems on the market today pull the air first through the single combination heater-A/C coil into the blowers. The air is then sent into the distribution ducts. This is a very common approach in order to package all the components into a small space. The negative side of this approach is that the air passes through the heater section, then the A/C section, and then passes around the blower motor where it picks up additional heat from the motor. This arrangement
also is extremely sensitive to any air-intake leakage around the blower housing, which dilutes the conditioned air and increases
the discharge temperature.
The current systems use a very outdated 3-speed, wire-wound DC motor that is very noisy and not capable of a long life. These systems also place the motor in the extreme temperature of the heater and A/C airflow, which will affect motor life.
enters the AirTech® II unit directly into the blower assembly. The air then passes through
the entire A/C coil and is forced into the distribution ducts. Unlike current systems, all airflow passes through the high
capacity 24,000-BTU evaporator coils for maximum efficiency. East Coast Custom Vehicles testing has proven a 7- to 10-degree
improvement of air-discharge temperature in actual applications.
The AirTech®II heat system works in either the heat or the defrost position, and is what we call a series reheat for the air path to move through two independent heat exchangers. The rear unit can also be used for rear window defogging.
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