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Old 11-12-2017, 09:23 PM   #10
dholdi
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There could be 2 pipes to outside, the prv and the condense, although it is acceptable to run the condense to an internal drain. I prefer internal as there is no risk of it freezing but sometimes its not practical.
The prv should be in copper and the condense in 21.5mm plastic internally changing to 40mm plastic just before it goes outside if it does. Some installers route the prv to the condense drain which is a bit naughty.
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