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SMC,
It's not the Propane that freezes, its the moisture in the air around the equipment. When the Propane transitions from liquid to vapor, or when the vapor transistions form high pressure to low pressure through the regulator, is brings the equipment below freezing, causing frost. The frost can occur inside the valve or regulator as a result of moisture contamination in the tank itself. Each time you change tanks or open valves, you are introducing moisture.
When we run the generator in a humid climate, the regulator turns into a ball of frost.
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