Fault repair of 4-Way Reversing Valve in central air conditioning
Start-up test run, found that heat pump unit blowing hot air, and the unit evaporator surface frosting, can judge the 4-Way Reversing Valve in the heating state without conversion, there is a problem. Measuring the four-way valve coil is not electricity to, so should be 4-Way Reversing Valve does not convert, 4-Way Reversing Valve may have a phenomenon of death, causing can not be reset.
Tap the 4-Way Reversing Valve with a wooden stick, restore the heating state, but re-open and stop the test machine, the fault is still in, confirm the need to replace the 4-Way Reversing Valve. When the 4-Way Reversing Valve is replaced, the refrigerant in the refrigeration system is released, nitrogen is charged to the refrigeration system, and the damaged four-way valve is welded. Remove the newly replaced 4-Way Reversing Valve coil, take the cooling measures, put the valve body into the sink, the welded pipe mouth to stay on the water, pay attention not to let moisture into the valve body. Or after soaking the veil with water, put on the valve body for cooling treatment, in order to prevent the welding, the valve body temperature rise, so that the slider deformation. When welding valve interface, avoid welding time too long.
Four-way valve has been replaced, the right amount of vacuum filling refrigerant, and leak testing machine, check the refrigeration and heating operation. Air source heat pump four-way valve should be noted that when the refrigeration system is insufficient or no refrigerant, can not drive the piston action in the valve body, so that the 4-Way Reversing Valve can not be reversed. Judge the good or bad of the 4-Way Reversing Valve must be very cautious, otherwise it will be more inefficient, because the four-way valve itself replacement is troublesome. To determine the 4-Way Reversing Valve fault is not difficult, first look at the 4-Way Reversing Valve has no conversion, if there is a 4-Way Reversing Valve is certainly good, if not converted to see if there is no electricity to the four-way valve, if there is a 4-Way Reversing Valve itself mechanical failure, if not, it must be the control circuit fault.http://www.shunfengvalve.com/fault-repair-of-4-way-reversing-valve-in-central-air-conditioning/4-Way Reversing Valve used in room air conditioners