4-Way Reversing Valve fault check procedure
1, check the power supply circuit of the 4-Way Reversing Valve, air conditioning is in the heating operation of the four-way valve power supply, through the power supply check can be determined to be a 4-Way Reversing Valve problem or control circuit problems.
2, check the 4-Way Reversing Valve coil, confirm the normal power supply, should check whether the coil is normal, when the online coil power, you should be able to hear the iron core suction time produced by the “click” Sound, but also can hear the main valve reversing the “bared” sound.
When the suspected coil has a problem, can measure its resistance, normal should be around 1.4kω, if the resistance value is very small or infinite, indicating a short circuit inside the coil or open circuit.
When the coil circuit breaker, the refrigeration is normal, but no legal heat, the internal machine evaporator frosting.
When the coil short-circuit open mechanism heat, may burn the fuse, so that the machine can not work. 3, check the main valve, by checking in and out of the main valve refrigerant temperature, you can determine whether the main valve is normal.
When the air conditioning is running, D communicates with C and connects with the compressor exhaust port (), E communicates with S and is connected with the evaporator (cooler); When heating operation, D communicates with E and connects with the compressor exhaust port (hotter), E and C are connected with the condenser return gas (cooler);
4, when the 4-Way Reversing Valve string gas, the difference between E, S, C may not be obvious, the return pressure rises close to the exhaust pressure, do not rush to replace the four-way valve, first check whether the system is lack of fluorine, because the lack of fluoride often lead to pressure difference can not be established, 4-Way Reversing Valve can not be normal commutation, If not normal, you can gently tap the valve body, repeated through power, such as a slight death can normally return to normal. If it is not normal, replace the four-way valve.http://www.shunfengvalve.com/4-way-reversing-valve-fault-check-procedure/4-Way Reversing Valve used in packaged and central air conditioners