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Thread: Hot gas defrost
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17-09-2007, 06:40 PM #1
Hot gas defrost
Hi
I have noticed something today which i have not experienced before.
A system operating at -20 with R404A on a DX internally equalized TEV.
As soon as it went onto hot gas defrost, the compressor became very very cold and even started to freeze over slightly it then gradually cleared throughout the duration of the defrost.
The hot gas line enters the evaporator after the TEV, with a check valve stopping hot gas going back to the TEV.
The sequence of the hot gas defrost is
1 normal refrigeration, sol valve in liquid line open, hot gas sol valve closed, evap fans on.
2 hot gas defrost, sol valve in liquid line shut, hot gas sol valve open, evap fans off.
I can only assume that the hot gas has blow any liquid sitting in the evaporator straight out, but why haven't i noticed it before.
Any ideas
Cheers
CB
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