Friedrich kuhl r-410a ユーザーズマニュアル

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REVERSING VALVE DESCRIPTION/OPERATION  

The Reversing Valve controls the direction of refrigerant 
fl ow to the indoor and outdoor coils. It consists of a 
pressure-operated, main valve and a pilot valve actuated 
by a solenoid plunger. The solenoid is energized during the 
heating cycle only. The reversing valves used in the RAC 
system is a 2-position, 4-way valve.

The single tube on one side of the main valve body is the  
high-pressure inlet to the valve from the compressor. The  
center tube on the opposite side is connected to the low  
pressure (suction) side of the system. The other two are  
connected to the indoor and outdoor coils. Small capillary 
tubes connect each end of the main valve cylinder to the   

“A” and “B” ports of the pilot valve. A third capillary is a common 
return line from these ports to the suction tube on the main 
valve body. Four-way reversing valves also have a capillary 
tube from the compressor discharge tube to the pilot valve.  

The piston assembly in the main valve can only be shifted  
by the pressure differential between the high and low sides  
of the system. The pilot section of the valve opens and 
closes ports for the small capillary tubes to the main valve  
to cause it to shift. 

Disconnect power to the unit before servicing. 

Failure to follow this warning could result in 

serious injury or death.