Maytag MFI2266AES Service Manual - Page 6
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Component Testing ! WARNING To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test procedures require power to be connected. Discharge capacitor through a resistor before attempting to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational. Component Capacitor Condenser Description Test Procedures Run capacitor connects to relay terminal 3 and L side of line. ! WARNING Some compressors do not require a run capacitor; refer to the Technical Data Sheet for the unit being serviced. To avoid electrical shock which can cause severe personal injury or death, discharge capacitor through a resistor before handling. 1. Disconnect power to refrigerator. 2. Remove capacitor cover and disconnect capacitor wires. 3. Discharge capacitor by shorting across terminals with a resistor for 1 minute. 4. Check resistance across capacitor terminals with ohmmeter set on "X1K" scale. • Good-needle swings to 0 ohms and slowly moves back to infinity. • Open-needle does not move. Replace capacitor. • Shorted-needle moves to zero and stays. Replace capacitor. • High resistance leak-needle jumps toward 0 and then moves back to constant high resistance (not infinity). Condenser is a tube and wire construction located in machine compartment. Leaks in condenser can usually be detected by using an electronic leak detector or soap solution. Look for signs of compressor oil when checking for leaks. A certain amount of compressor oil is circulated with refrigerant. Condenser is on high pressure discharge Leaks in post condenser loop are rare because loop is a one-piece copper tube. side of compressor. Condenser function is to transfer heat absorbed by refrigerant For minute leaks to ambient. 1. Separate condenser from rest of refrigeration system and pressurize condenser up to a maximum of 235 PSI with a refrigerant and dry nitrogen Higher pressure gas is routed to combination. condenser where, as gas temperature is 2. Recheck for leaks. reduced, gas condenses into a high pressure liquid state. Heat transfer takes place because discharged gas is at a higher temperature than air that is passing over condenser. It is very ! WARNING important that adequate air flow over To avoid severe personal injury or death from sudden eruption of high condenser is maintained. pressures gases, observe the following: Protect against a sudden eruption if high pressures are required for leak Condenser is air cooled by condenser fan checking. motor. If efficiency of heat transfer from Do not use high pressure compressed gases in refrigeration systems condenser to surrounding air is impaired, without a reliable pressure regulator and pressure relief valve in the condensing temperature becomes higher. lines. High liquid temperature means liquid will not remove as much heat during boiling in evaporator as under normal conditions. This would be indicated by higher than normal head pressures, long run time, and high wattage. Remove any lint or other accumulation, that would restrict normal air movement through condenser. From condenser the refrigerant flows into a post condenser loop which helps control exterior condensation on flange, center mullion, and around freezer door. Refrigerant flows through the drier to evaporator and into compressor through suction line. 6 16026312 ©2006 Maytag Services