Hi all, This is not something too technical but I would like to know why is the NON AC System called 'SUM'. Abbreviation of what? Thanks and regards, -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20180215/a5f8e9f1/attachment.html>