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Difference between lp cutout and lp controller,hp cut out

Lp controller- performs the switching on and of compressor if there is low pressure in compressor suc line due to the closure TEV since the required temperature is achieved in the evaporator,

while Lp cutout is a safety device to protect compressor against low suction pressure due to blockage or leakage otherwise vacuum in line causes ingress of air
Hp cutout trips compressor if pressure at discharge side of the compressor exceeds the working pressor
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