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I have a newly installed Alpine APL105 condensing boiler. My question is about the system's Return & Supply connections. The system diagram (Figure 32) on page 47 of the Installation, Operating manual shows the “First System Connection Tee” to be for system RETURN and the “Second System Connection Tee” to be for the system SUPPLY.
My system has these connections reversed.
Should I be concerned? I note that under the Boiler Protection section of the manual (pg95) refers to "Inversion Limit" which would cause a hard lockout and shut down the boiler. This is the result of "incorrectly attaching the supply and return piping". I have noticed that the return temperature is at times 2-3 degrees higher than the supply, owing to the reversed connections. I have not had this system fault occuring. The Return and Supply tees are within 6" of each other on the primary loop.