ManualVerified 2026 edition
LGT / LCT rooftop installation instructions — May 2026
LGT/LCT156H, 180H, 210H, 240H and 300H, 13–25 ton R-454B packaged rooftop units. Not a residential split-system manual.
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Document applicability
- Publisher
- Lennox
- Indexed models
- LGT156H, LGT180H, LGT210H, LGT240H, LGT300H, LCT156H, LCT180H, LCT210H, LCT240H, LCT300H
- Edition
- 508458-01 · May 2026 · supersedes May 2025
- Format
- PDF · 98 pages
- Region
- United States; confirm local applicability
- Access
- Public PDF
- Index review
- 2026-09-29; confirm the publisher’s current revision before use
- Source
- www.lennox.com
Jump to a useful section
Printed manual page numbers. Confirm the model scope above before applying a test or diagram.
Cross-check the diagnosis
These original learning guides explain possible causes and lookalikes. The publisher’s exact-model procedure controls on live equipment.
Build your call worksheet →Before applying this reference
- Match full equipment and controller models, refrigerant, region and document revision.
- Use the unit wiring label and OEM specifications. A related brand name or similar cabinet does not prove compatibility.
- Isolate power, secure against restart and prove it absent before resistance tests or repairs. Follow approved capacitor and inverter discharge procedures.
- Preserve safety interlocks and refrigerant mitigation. Stop on unsafe conditions or suspected leakage.