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Table 50 — Humidifier Troubleshooting
AHU — Air-Handling Unit
SYMPTOM POSSIBLE CAUSES POSSIBLE REMEDIES
Water is spitting from the
discharge manifolds
Steam trap is not functioning properly. Clean or replace non-functioning steam trap on the valve/trap
assembly.
The header P-traps are not draining. Clean and check that plumbing runs to gravity drain. Check that trap
height exceeds the static pressure of the duct/AHU, es
pecially if it is
under negative pressure.
The steam line has been taken from
the bottom of the steam source or is
not sloped properly.
Change line to take off from the top and check proper slopes.
The steam main is overloaded with water. Locate cause and correct problem.
Vertical discharge manifolds are not plumb. Make manifolds plumb.
Horizontal headers are not level. Make headers level.
Vertical discharge manifolds are
installed upside down.
Reinstall correctly.
Check valve sizing to maximum
manifold capacity.
Resize valve within manifold capacity.
Steam does not
discharge from the
manifolds when the valve
is open
Valve is not open. Open valve.
There is no steam available. Verify that steam is available.
There is a change in steam pressure. Verify that the steam pressure has not changed. Excessively high
pres-
sure could jam the valve.
Steam is not visible. Carefully place a mirror or metal object close to one of the steam dis-
charge slots. If it fogs, steam is discharging, but evaporating very
quickly. This is not a problem. NEVER PLACE YOUR HAND OVER OR
NEAR THE STEAM DISCHARGE SLOTS.
Y-strainer may be clogged. Clean or replace Y-strainer.
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