Dear All,

We are facing some issues with a ***** ( R404a) system in a cold storage unit (-20deg C).

The compressor is a semi hermetic reciprocating type, make Bitzer.

While normal operation the discharge and suction pressure is 350psi and 50psi. The temperature is also OK.

But while the defrosting is on.the pressure for both discharge and suction is 100 and 80psi respectively.

The defrosting method here is hot gas type.

And while in this condition the liquid line is not getting proper heat to melt ice in Evaporator coils.

Kindly please look into this matter and help us.

Thanks.