When the ice melts in a compartment and the liquid is at or above ambient level the compartment air supply is switched to an un melted compartment.
(the ice; melts; L:in a compartment) (the liquid; is; at or above ambient level) (the compartment air supply; is switched; to an un melted compartment) (un; melted; compartment)
the ice the liquid the compartment air supply un
melts is is switched melted
L:in a compartment
at or above ambient level
to an un melted compartment
compartment