How do you avoid cracking a VAV reheat coil connection when tightening piping?

Plain-English answer

VAV hot-water/reheat coil connections are not heavy pipe nipples to muscle around. If a fitting is tightened without backing up the coil connection, the internal copper/header can twist and crack inside the box.

If it leaks, stop adding torque. Protect the space, isolate/drain if directed, open the casing if needed, and have the repair done by the responsible trade/person. Future connections need a proper two-wrench/back-up method and manufacturer/submittal direction.

Field checklist

• Stop tightening when the coil fitting moves or the casing starts twisting.
• Check whether water is active and whether the loop needs isolation/shutdown.
• Find leak location: external fitting, coil connection, internal header, or casing.
• Document the damage and notify foreman/mechanical piping lead.
• Use backup wrench/support method on any remaining connections.

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