1 why don't cause electromagnetic four-way reversing valve reversing? How to check and repair? The causes of electromagnetic four-way reversing valve is not reversing are: (1) electromagnetic valve electromagnetic coil burned. Cut off the power and electromagnetic coil is measured with a multimeter R * 1 file of dc resistance and the on and off. When measuring the dc resistance is far less than the specified value, the electromagnetic coil internal local short circuit. Should replace the same model of the electromagnetic coil, when the replacement, attention should be paid before without the line trap into the central core, cannot make electricity inspection, otherwise easy to burning coil. 2 directional control valve on the piston of drainage hole was blocked. The reversing valve piston frustrated hole diameter is only 0. 3mm. , although there are screen hole before, if you don't clean the refrigeration system, is easy to be blocked, can't reverse fault. For this kind of failure can be as follows: first repeatedly through, to cut off the circuit of electromagnetic coil, make continuous reversing reversing valve, so that in addition to dirt. If still rush impassability, can remove the directional control valve to wash or replace electromagnetic four-way reversing valve. (3) the reversing valve piston bowl. Will is refrigeration and air conditioning unit of the temperature control knob clockwise rotating exactly, make the air conditioner stopped working, after waiting for 3 min high and low pressure into balance, reversing valve and electricity. If still null and void, so repeated several times, can only change new electromagnetic four-way reversing valve. (4) the reversing valve right blowhole doesn't close tightly. Electromagnetic four-way reversing valve is normal after reversing, air conditioner run in heating condition. At this point, the directional control valve on the right side of capillary should be colder, the left side of the high pressure capillary should be warmer. If left and right 2 capillary heat, that is the directional valve right blowhole doesn't close tightly. Treatment method is to make the electromagnetic four-way Industrial Valves electricity for many times, such as the right hole still doesn't close tightly, had to change new electromagnetic four-way reversing valve. 5] refrigerant leakage. Due to the refrigerant leakage, reduce high and low pressure difference, make the reversing valve reversing difficult. On this failure should be leak, repair welding, vacuum and charging refrigerant. The capillary jam [6] electromagnetic four-way reversing valve. For this kind of failure can be repeatedly through, to cut off the circuit of electromagnetic coil, make continuous reversing reversing valve, in addition to dirt. If still rush impassability, can remove the wash or change the capillary. Once to a bad compressor. Outlet air temperature is low, such as condenser electromagnetic four-way reversing valve with high pressure capillary is not very hot, compressor has a fault, should according to the condition of the compressor fault, repair ruled out. 2. How to use the multimeter to check the electromagnetic four-way valve? Can multimeter measure the four-way valve coil resistance. When the voltage is 220 v, the electromagnetic valve electromagnetic coil resistance value of about 700 Ω ( The environment temperature is 20 degrees) 。 If the coil resistance is zero, the coil short circuit; If has infinite resistance coil, coil has open circuit. 3. Four-way valve common faults: lack of traffic, reversing undesirable. The causes of deficiency of traffic: (1) the system leakage, lack of refrigerant. Low temperature, refrigerant evaporation. (3) four-way valve and the system does not match that of the selected large four-way valve flow and system capacity is small. (4) air conditioner commutation time. General system design for the compressor shut down after a certain time four-way valve commutation, the high and low pressure into balance, then stop reversing to the middle position, namely the four-way valve reversing does not reach the designated position, the main stop valve in the middle position, the next startup, due to traffic role among traffic. 5] compressor startup flow is insufficient, frequency converter is more obvious. Reversing undesirable reasons: (1) coil disconnection or voltage does not conform to the stipulations of the coil performance, pilot valve valve core cannot move. 2 due to external causes, pilot valve part deformation, cause the valve core is not action. (3) due to external causes, pilot valve deformation, capillary flow is insufficient, can't form the reversing the required pressure difference and cannot move. (4) due to external causes, the main body deformation, the piston is stuck and cannot move. 5] in the system of debris into the four-way valve stuck or main valve piston and cannot move. [6] brazing piping, the main body of the temperature over 120 degrees, the thermal deformation and internal parts can't action. Once the air conditioning system refrigerant leakage, refrigerant is insufficient, the reversing the required pressure difference cannot be established and cannot move. Can't meet the four-way valve being supplied as refrigerant in the compressor circulation flow of necessary reversing. 'levies frequency conversion compressor speed frequency low, reversing the necessary traffic not guaranteed. ⑽ vortex compressor make the system produces hydraulic impact four-way valve piston was damaged but not action. Mixes up and maintenance of: (1) with the hand to touch the bottom of the four-way valve three tube, if fever, four-way valve commutation is not in place, in the middle mixes up state. FZX appliance repair 2 can also use a small piece of magnet, when reversing small magnets don't move, also suggests that mixes up. To the system into a certain amount of refrigerant, can the reversing in place. Not the reversing ( Its failure is not cooling or heating) Determination and maintenance: (1) lack of refrigerant ( Only use the system pressure discriminant incomplete) 。 Diction leakage fluorine. (3) body or capillary deformation. (4) coil power is normal, if the voltage is normal. 5] judgment pilot valve without action: coil power tong have a 'click clicking' valve core impact, shows that action of pilot valve is normal. At this point it is best to four-way valve electricity, in order to hear the sound. [6] pilot valve movement is normal, the main body is not action, shows that action of four-way valve reversing the minimum differential pressure not established, filling the refrigerant within the system. Once the hydraulic impact. May be a. Four-way valve installation direction is wrong; b。 Using the vortex compressor; c。 In winter the temperature is too low; d。 Globe valve is not open.
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