I have been told to install a CPR onto a R404A system.

The fridge has a badly designed drainage/defrost system. Hotgas Defrost.

The freezer sits on approx -18c to -25c all day, and the evap just turns to one huge block of ice.
The theory behind installing the CPR is they think while 'Hotgas Defrost' is in operation, the CPR will help raise the temperature in the evaporator, because the hotgas coming through will be restricted at the CPR and raise pressures in the evaporator, helping the defrost operation.

Although i like the idea of having a CPR in a system with hotgas defrost, to compressor does not recieve hot suction vapour. I do not believe it would help raise the evaporator pressure/temp.

Anyone have thoughts on this???