Quote:
Originally Posted by ChuckS
The Suburban IW60 has freeze protection ... if it’s hooked to 12 volts and propane on.
However... if not and you didn’t open the IW60 drain and drain residual water out the freeze protection valve will freeze and crack
Pic of freeze protection valve and explanation of freeze protection circuit
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ChuckS,
Read the last 4 words of the last sentence in your attachment: "if valve is closed". If the thermoplastic freeze protection valve is "left open" (in normal operation position) then the valve will protect the system from freeze damage by opening to drain any water above it when the ambient temperature falls to 39F. If the system is drained of water, filled with antifreeze, and the freeze protection valve is in "normal position", then it will drain the antifreeze from above itself. That's the design feature.
Now, if the owner disables the valve by closing it, the freeze protection feature is disabled and whatever is above the valve will not drain. If it's water, expansion damage will potentially occur. If it's antifreeze, the water heater would be protected, but the question becomes: "Is RV antifreeze corrosive in this model water heater"??? That's a question I can't answer...