Several common faults and corresponding maintenance methods of 4-Way Reversing Valve
1, the air-conditioning system leakage, resulting in a lack of system refrigerant circulation;
2, The weather is very cold, the refrigerant evaporation is insufficient;
General system design for a certain time after the compressor shutdown after the four-way valve commutation, when the high and low pressure to balance, reversing to the middle position will stop, that is, the 4-Way Reversing Valve is not in place, the main sliding valve stops in the middle position, the next start, due to the middle flow caused by insufficient flow;
5, The compressor starts the flow is insufficient, the frequency conversion machine is more obvious.
1, coil disconnection or voltage does not meet the requirements of the coil performance, resulting in the pilot valve spool can not act.
2, due to external reasons, the pilot valve part of the deformation, resulting in the valve core can not act.
3, due to external reasons, the pilot valve capillary deformation, The flow is insufficient, can not form the pressure differential to reverse the Action.
4, due to external reasons, the main valve body deformation, the piston is stuck to die and can not Move.
5, the system of debris into the 4-Way Reversing Valve inside the dead piston or main spool valve and can not Move.
6, brazing piping, The main valve body temperature of more than 120 degrees, internal parts of the thermal deformation can not be action.
7, Air Conditioning system refrigerant leakage, Insufficient refrigerant, reversing the pressure difference can not be established and can not Action.
8, the refrigerant circulation volume of the compressor can not meet the 4-Way Reversing Valve reversing the necessary flow.
9, frequency Conversion Compressor speed is low, the necessary flow of commutation is not guaranteed.
10, Scroll compressor to make the system hydraulic impact caused by the 4-Way Reversing Valve piston is destroyed and unable to Move.
Serial Gas Maintenance
1, Touch the four-way valve by hand the following three tube, if all heat, indicating that the 4-Way Reversing Valve commutation is not in place, in the middle of a series of gas State. 2, You can also use a small magnet, when reversing the small magnet does not move with it, It also shows that the series of Gas.
The system is filled with a certain amount of refrigerant and can be reversed in place.
The failure is characterized by non-refrigeration or non-heating:
1, Insufficient refrigerant (only using the system pressure discrimination is not comprehensive).
2, Leakage of Fluorine.
3, valve body or capillary deformation.
4, the coil through the power is normal, the voltage is Normal. 5, judge the pilot valve has no action: the coil through the power off when there is “click and da” the valve core impact sound, indicating that the pilot valve normal Operation.
Only Four-way valves should be energized at this time to hear the sound.
6, the pilot valve normal operation, The main valve body does not act, 4-Way Reversing Valve reversing the minimum operating pressure difference is not established, into the system into the Refrigerant. 7, Hydraulic SHOCK. May be A. 4-Way Reversing Valve installed in the wrong direction; B. Using a scroll compressor; c. The temperature in winter is too low; d. The stop valve is not Open.http://www.shunfengvalve.com/several-common-faults-and-corresponding-maintenance-methods-of-4-way-reversing-valve/4-Way Reversing Valve used in room air conditioners