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System drain down.

Municipal Code of Chicago § 18-28-1206.2
in effect
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18-28-1206.2 System drain down. Hydronic piping systems shall be designed and installed to permit the system to be drained. Where the system drains to the plumbing drainage system, the installation shall conform to the requirements of the Chicago Plumbing Code. (Amend Coun. J. 9-14-21, p. 35949, Art. XII, § 4)
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2689090Fetched: 10/24/2026

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