In the air-conditioning heat pump system, the four-way valve changes the refrigerant flow direction in winter and summer to switch the refrigeration and heating modes of the system.
1. Operation Unit: to often observe the compressor oil surface and back oil and oil cleanliness, found dirty or oil surface drop to be resolved in time, so as not to cause poor lubrication.
In air-conditioning and refrigeration systems, liquid refrigerants are usually installed in the liquid line, through a transparent wide-angle lens to observe the refrigerant liquid level and flow conditions, through the lens center indicator color changes, check the water content in the refrigerant.