HWP30N/HWP40N Forced Circulation Heater User Manual Page 7 of 14
Fig.3 Incorrect Pipe Connection Methods
NOTE:
If there is a W-shaped bend or reverse U-shaped bend during pipe connection, the air accumulated in the pipe
cannot be discharged normally, resulting in the liquid cannot be circulated properly. The air dissolved in the liquid will be
precipitated during heating and retained in the bend, so on the condition of unsmoothed pipeline, even if by the manual
exhaust, it will repeat in the next heating process of air collection. To ensure that the smooth liquid circulation, the
hosepipe with an inner diameter of more than 20mm and pipe joints with an inner diameter of more than 15mm should
be selected.
