HTP EL-399NVWH - Manual (Page 72)

72
LP- 346 REV. 3.20.14
The condensate line must remain unobstructed, allowing free flow of condensate. If condensate freezes in the line, or if line is
obstructed in any other manner, condensate can exit from the tee, resulting in potential water damage to property.
10. If the boiler has a condensate pump, ensure the pump operates properly before considering maintenance complete.