Air Conditioner - Performance: Overview
83mitsubishi04SUBJECT:
AIR CONDITIONER PERFORMANCE
NO. STB-83-24-007
DATE November 1983
MODEL Cordia/Tredia
INTRODUCTION The only reliable method for testing the air conditioning cooling performance of 1983 and 1984 model Cordia/Tredia is by measuring system pressures and duct temperatures. Because these measurements vary with atmospheric temperature and humidity, the tables on page 3 will help in interpreting the measurements you make. The presence of bubbles in the sight glass (especially at high ambient temperatures) should not be interpreted as a partial refrigerant charge. In fact, efforts to eliminate bubbles in the sight glass by adding more than the specified amount of refrigerant can cause a depreciation in system performance. We recommend a system performance test whenever there is a question whether the system is operating at rated efficiency. To aid in the diagnosis of conditions. pages 4 through 7 of this bulletin contain diagnostic charts for use with the test equipment and procedures outlined below.
EQUIPMENT
^ A/C Manifold Gauge Set
^ Four dial thermometers, one with a gauze-wrapped bulb, or two dial thermometers and a psychrometer.
TEST CONDITIONS To insure consistent results, tests must always be performed under the following conditions:
^ Car location: indoors or in the shade
^ Wind velocity: less than 5 mph
^ Car doors: closed
^ Car windows open
^ Car hood: open
^ A/C control settings: Mode - "Max" or "Inside Air", Temp - max cold; Fan - high
^ Engine speed: 1500 rpm
^ Temperature measurement locations:
- air duct: at center outlet grille
- car inside air at blower inlet
- outside air: 3 feet in front of condenser