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Resumen del manual
The evaporator in a partial restriction could be partially frosted or have an ice ball close to the entrance of the metering device. Frost may continue on the suction line back to the compressor. Often a partial restriction of any type can be found by feel, as there is a temperature difference from one side of the restriction to the other. With a complete restriction, there will be no sound at the metering device entrance. An amperage check of the compressor with a partial restriction may show normal current when compared to the unit specification. With a complete restriction the current drawn may be considerably less than normal, as the compressor is running in a deep vacuum (no load). Much of the area of the condenser will be relatively cool since most or all of the liquid refrigerant will be stored there. The following conditions are based primarily on a system in the cooling mode. Troubleshooting a restricted refrigerant system can be difficult. The following procedures are the more common problems and solutions to these problems. There are two types of refrigerant restrictions: Partial restrictions and complete restrictions. • A partial restriction allows some of the refrigerant to circulate through the system. • With a complete restriction there is no circulation of refrigerant in the system. • Restricted refrigerant systems display the same symptoms as a “low-charge condition.” • When the unit is shut off, the gauges may equal ize very slowly. • Gauges connected to a completely restricted system will run in a deep vacuum. When the unit is shut off, the gauges will not equalize at all. TROUBLESHOOTING TOUCH TEST CHART: TO SERVICE REVERSING VALVES SUCTION TUBE toCompressorTube to INSIDECOILTube to OUTSIDECOILLEFT PilotCapillary TubeRIGHT PilotCapillary TubeNOTES: * TEMPERATURE OF VALVE BODY ** WARMER THAN VALVE BODY 2 3 4 5 6 POSSIBLE CAUSES CORRECTIONS Cool Cool as (2) Hot as (1) *TVB TVB Cool Hot as (1) Cool as (2) *TVB TVB NORMAL FUNCTION OF VALVE VALVE OPERATING CONDITION DISCHARGE TUBEfrom Compressor1 Normal Cooling Hot Normal Heating Hot MALFUNCTION OF VALVE Valve will not shift from cool to heat. Check Electrical circuit and coil No voltage to coil. Repair electrical circuit. Defective coil. Replace coil. Check refrigeration charge Low charge. Repair leak, recharge system. Pressure differential too high. Recheck system. Hot Cool Cool, as (2) Hot, as (1) *TVB Hot Pilot valve okay. Dirt in one bleeder hole. De-energize solenoid, raise head pressure, reenergize solenoid to break dirt loose. If unsuccessful, remove valve, wash out. Check on air before installing. If no movement, replace valve, add strainer to discharge tube, mount valve horizontally. Piston cup leak Stop unit. After pressures equalize, restart with solenoid energized. If valve shifts, reattempt with compressor running. If still no shift, replace valve. Valve will not shift from cool to heat. Hot Cool Cool, as (2) Hot, as (1) *TVB *TVB Clogged pilot tubes. Raise head pressure, operate solenoid to free. If still no shift, replace valve. Hot Cool Cool, as (2) Hot, as (1) Hot Hot Both ports of pilot open. (Back seat port did not close). Raise head pressure, operate solenoid to free partially clogged port. If still no shift, replace valve. Warm Cool Cool, as (2) Hot, as (1) *TVB Warm Defective Compressor. Replace compressor Starts to shift but does not complete reversal. Hot Warm Warm Hot *TVB Hot Not enough pressure differential at start of stroke or not enough fl ow to maintain pressure differential. Check unit for correct operating pressures and charge. Raise head pressure. If no shift, use valve with smaller port. Body damage. Replace valve Hot Warm Warm Hot Hot Hot Both ports of pilot open. Raise head pressure, operate solenoid. If no shift, use valve with smaller ports. Hot Hot Hot Hot *TVB Hot Body damage. Replace valve Valve hung up at mid-stroke. Pumping volume of compressor not suffi cient to maintain reversal. Raise head pressure, operate solenoid. If no shift, use valve with smaller ports. Hot Hot Hot Hot Hot Hot Both ports of pilot open. Raise head pressure, operate solenoid. If no shift, replace valve. Apparent leap in heating. Hot Cool Hot, as (1) Cool, as (2) *TVB *TVB Piston needle on end of slide leaking. Operate valve several times, then recheck. If excessive leak, replace valve. Hot Cool Hot, as (1) Cool, as (2) ** WVB ** WVB Pilot needle and piston needle leaking. Operate valve several times, then recheck. If excessive leak, replace valve. Will not shift from heat to cool. Hot Cool Hot, as (1) Cool, as (2) *TVB *TVB Pressure differential too high. Stop unit. Will reverse during equalization period. Recheck system Clogged pilot tube. Raise head pressure, operate solenoid to free dirt. If still no shift, replace valve. Hot Cool Hot, as (1) Cool, as (2) Hot *TVB Dirt in bleeder hole. Raise head pressure, operate solenoid. Remove valve and wash out. Check on air before reinstalling, if no movement, replace valve. Add str...