GMW GMW14782 PDF

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose. All test sequences shall be used to evaluate the air conditioning (A/C) and heater module itself, and shall, therefore, be performed outside the vehicle.

Module Characteristic Curves. The air flow shall be determined as a function of the air-side resistance of the module for each of the six air settings:

• Bi-level (heater and ventilation), cold;

• Ventilation, cold;

• Heater cold;

• Heater warm;

• Defrost, warm; and

• Defog (heater and defrost), warm.

The characteristic curves thus obtained are necessary on the one hand for evaluating the air-side capacity of the module; on the other hand, they set the preconditions for evaluating the flow quality of the air ducts in the vehicle.

Air Flow of "Bare Modules" at a Specified Air Resistance. The air capacity of the module as a function of the terminal voltage shall be examined for all the air settings of paragraph 1.1.1.

To simulate as closely as possible the situation in the vehicle, resistance shall be applied upstream or downstream of the module, depending on the air ducts being tested. See the appropriate Vehicle Technical Specification (VTS), Subsystem Technical Specification (SSTS), drawing, or equivalent.

 Applicability. All A/C and heater modules.