Rotary vane compressors contain a solid rotating cylinder called an impeller. The impeller is equipped with vanes that move in and out of slots in the impeller.
There are two types of piston compressors currently in use, the opposed axial type, (also often referred to as the swash plate type), and the single row axial or wobble-plate type. Depending on design, these compressors may contain five, six, seven, or ten pistons.
With either type of piston compressor, the pumping action of the pistons draws low
Pressure testing is used to check for leaks in the cooling system and to test the radiator cap.
A vehicle has many electrical circuits. For an electrical component to function properly, the electricity must return to the source through the ground side of the circuit. Ground paths are usually metal conductors such as wires or the vehicle frame, engine or body.
As the weather turns cooler and windshields become fogged up or frosty, you’ll want to activate the defrost button.
Did you know today, Tuesday, September 14, 2010 is the 40th anniversary of the United States Clean Air Act? Section 608 and Section 609 which regulate stationary and mobile…
All hoses used with mobile A/C system service equipment must be equipped with shut-off valves.
1. ALWAYS wear eye protection when servicing air conditioning systems or handling refrigerant.
2. Avoid breathing refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and throat. If accidental discharge occurs, ventilate the work area.
3. Do not allow refrigerants to come in contact with open flames and high-temperature surfaces. Decomposition is hazardous, and can occur if refrigerant is exposed to high temperatures (open flames, hot metal surfaces, etc.)
4. HFC-134a is not flammable at normal ambient temperatures and atmospheric pressure. However, tests have shown it to be combustible at certain pressures and ambient temperatures when mixed with air under pressure in a sealed environment. Service equipment or vehicle A/C systems should not be pressure tested or leak tested with compressed air.
5. PAG lubricant is hygroscopic (absorbs moisture). Containers must be kept tightly closed.
6. PAG lubricant can be a skin irritant. Protective impervious gloves are required to prevent lubricant contact with the skin. To help avoid skin contact, mineral oil should be used to coat o-rings and seals prior to installation. Also, since PAG lubricants absorb moisture, using mineral oil reduces the potential for fitting corrosion.
7. PAG lubricants can cause damage to paint, plastic parts, engine drive belts and coolant hoses. Care should be taken to prevent PAG lubricants from coming into contact with these items.
8. Failure to follow instructions provided by A/C system service equipment manufacturers could result in personal injury or equipment damage.
9. To prevent refrigerant cross-contamination, use separate service equipment for each refrigerant. Lubricant and refrigerant left in hoses and equipment can be a source of cross-contamination.
10. NEVER transfer refrigerants to a cylinder or tank unless it is Department of Transportation approved for refilling.
DOT approval is indicated by the designation “DOT 4BA” or “DOT 4BW” stamped on a tank’s collar (handle).
11. If a refrigerant tank is overfilled, it may explode. To prevent this from occurring, when transferring refrigerant into a tank, the safe filling level must be controlled by weight, and must not exceed 60% of the tank’s gross weight rating.
12. NEVER perform service on recovery/recycling/recharge equipment (other than routine maintenance) without first consulting authorized service personnel. The removal of internal fittings and filters can cause the escape of refrigerant under pressure.
13. NEVER perform maintenance or service on recovery/recycling/recharge equipment with the unit plugged into electric power unless directed otherwise.
14. Avoid using extension cords with recovery/recycling/recharge equipment. If this is unavoidable, use a minimum length, 3-wire (No. 14 AWG minimum) cord with a ground circuit. To prevent shock hazards and reduce the risk of fire, make sure the extension cord is in good condition (not worn or frayed) with the ground circuit intact.
15. Recovery/recycling/recharge equipment often contains parts that may produce arcs or sparks. Do not use this equipment near flammable liquids or vapors.
16. Fuel injection systems on vehicles contain a service port the same size as one of the CFC-12 A/C system service ports. Be careful not to attach A/C service equipment to a vehicle’s fuel injection system.
Additional health and safety information may be obtained from equipment, refrigerant and lubricant manufacturers.
Refer to their instruction manuals and Material Safety Data Sheets.
Caution: When using recovery/recycling/recharge equipment, while it is very important to follow the general service procedures outlined in this manual, it is also very important to follow your equipment’s manufacturer’s instructions.
Failure to follow these instructions could result in personal injury, damage to the equipment or A/C systems, or improper or inadequate refrigerant recovery, recycling and containment.
When having your mobile A/C system professionally serviced, insist on proper repair procedures and quality replacement parts. Insist on recovery and recycling so that refrigerant can be reused and not released into the atmosphere.
You can E-mail us at macsworldwide@macsw.org or visit http://bit.ly/cf7az8 to find a Mobile Air Conditioning Society repair shop in your area. Visit http://bit.ly/9FxwTh to find out more about your car’s mobile A/C and engine cooling system.
Learn more about the Mobile Air Conditioning Society’s 2011 convention and trade show.
Is this blog obsessed with cabin air filters?
No, we just want to show you what used mobile A/C and engine cooling parts look like.
Motor vehicle air conditioning systems can release refrigerant into the atmosphere in a number of ways.
