Nortec NH Series - Manual (Page 23)

Installation | 20
8. Increase diameter either on down slope or install condensate trap.
9. Install condensate traps if steam line > 15 feet (4.5 m).
10. In addition, never:
After installation, always

Purge steam lines to remove any contaminants and installation materials.

Ensure all condensate lines/traps flow freely.