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Resumen del manual
Capacitor Connections The starting winding of a motor can be damaged by a shorted and grounded running capacitor. This damage usually can be avoided by proper connection of the running capacitor terminals. From the supply line on a typical 230 volt circuit, a 115 volt potential exists from the “R” terminal to ground through a possible short in the capacitor. However, from the “S” or start terminal, a much higher potential, possibly as high as 400 volts, exists because of the counter EMF generated in the start winding. Therefore, the possibility of capacitor failure is much greater when the identified terminal is connected to the “S” or start terminal. The identified terminal should always be connected to the supply line, or “R” terminal, never to the “S” terminal. When connected properly, a shorted or grounded running capacitor will result in a direct short to ground from the “R” terminal and will blow the line fuse. The motor protector will protect the main winding from excessive temperature. Dual Rated Run Capacitor Hook-up WARNING ELECTRIC SHOCK HAZARD Turn off electric power before servicing. Discharge capacitor with a 20,000 Ohm 2 Watt resistor before handling. Failure to do so may result in personal injury, or death. Many motor capacitors are internally fused. Shorting the terminals will blow the fuse, ruining the capacitor. A 20,000 ohm 2 watt resistor can be used to discharge capacitors safely. Remove wires from capacitor and place resistor across terminals. When checking a dual capacitor with a capacitor analyzer or ohmmeter, both sides must be tested. ComPonEntS tEStIng (Continued) HEATER ELEMENTS AND LIMIT SWITCHES’ SPECIFICATIONS All heat pumps and electric heat models are equipped with a heating element and a limit switch (bimetal thermostat). The limit is in series with the element and will interrupt the power at a designed temperature. Should the blower motor fail, filter become clogged or airflow be restricted etc., the high limit switch will open and interrupt the power to the heater before reaching an unsafe temperature condition. VPAK 9K, 12K and 18K BTUs Models: 2.5 KW, 230 V, Resistance 18.61 Ohms + - 5%. Has 1 Limit Switch, Opens at 120° F, Closes at 90° F, It has a One Time Open Temp. of 145° F. 3.4 KW, 230 V, Resistance 13.68 Ohms + - 5%. Has 1 Limit Switch, Opens at 120° F, Closes at 90° F, It has a One Time Open Temp. of 145° F. 5 KW, 230 V, Resistance 9.31 Ohms + - 5%. Has 1 Limit Switch, Opens at 130° F, Closes at 100° F, It has a One Time Open Temp. of 155° F. VPAK 24K BTUs Models: 2.5 KW, 230 V, Resistance 18.61 Ohms + - 5%. Has 2 Limit Switches, Primary Opens at 155° F, Closes at 125° F, Secondary’s Open Temp. is 200° F. 3.4 KW, 230 V, Resistance 13.68 Ohms + - 5%. Has 2 Limit Switches, Primary Opens at 155° F, Closes at 125° F, Secondary’s Open Temp. is 200° F. 5 KW, 230 V, Resistance 9.31 Ohms + - 5%. Has 2 Limit Switches, Primary Opens at 155° F, Closes at 125° F, Secondary’s Open Temp. is 200° F. 7.5 KW, 230 V (composed of 2, 3.7 KW Elements) Each Has a Resistance of 12.41 Ohms + - 5%. Each Has 2 Limit Switches, Primary Opens at 165° F, Closes at 135° F With a 1 time Open Temp. of 210° F. Secondary Limit’s Open Temp. is 200° F. 10 KW, 230 V (composed of 2, 5 KW Elements) Each Has a Resistance of 9.31 Ohms + - 5%. Each Has 2 Limit Switches, Primary Opens at 165° F, Closes at 135° F With a 1 time Open Temp. of 210° F. Secondary Limit’s Open Temp. is 200° F. NOTE: Always replace with an exact replacement. TESTING THE HEATING ELEMENTS AND LIMIT SWITCHES WARNING ELECTRIC SHOCK HAZARD Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death. Testing of the heating elements can be made with an ohmmeter or continuity tester across the terminals after the power wires have been removed. Test the limit switch for continuity across its input and output terminals.Test below the limit switch’s reset temperature. DRAIN PAN VALVE During the cooling mode of operation, condensate which collects in the drain pan is picked up by the condenser fan blade and sprayed onto the condenser coil. This assists in cooling the refrigerant plus evaporating the water. During the heating mode of operation, it is necessary that water be removed to prevent it from freezing during cold outside temperatures. This could cause the condenser fan blade to freeze in the accumulated water and prevent it from turning. To provide a means of draining this water, a bellows type drain valve is installed over a drain opening in the base pan. This valve is temperature sensitive and will open when the outside temperature reaches 40°F. The valve will close gradually as the temperature rises above 40°F to fully close at 60°F. Bellows Assembly Drain Pan Valve REFRIgERatIon SEqUEnCE oF oPERatIon A good understanding of the basic operation of the refrigeration system is essential for the service technician. Without this understanding, accurate troubleshooting of refrig...
Otros modelos de este manual:Los acondicionadores de aire - 000 BTU'S (4.23 mb)