Armstrong World Industries 6100 - Manual (Page 26)

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Dispersion tube spits water or water is present in duct
Hint: It is very helpful to cut a small observation window in the duct and cover it with Plexiglas so the
steam discharge from the manifold can be observed. This way the problem can be narrowed down to
piping/steam quality (steps 1 and 2) or a condensation problem (steps 3 and 4).
1. Check distribution piping for proper pitch and size. Make sure there are no loops, dips or sags
where pockets of water can collect. If such conditions exist and are unavoidable, a ‘P’ trap is
needed to drain the low spots.
2. Make sure any drains are piped correctly and pitched to a floor drain.
3. Check duct downstream of manifold. If any obstructions (coils, elbows, fans) are within 10’, the
vapor (condensed steam) discharged from the manifold may be impinging on the obstacle before it
has a chance to absorb into air. This is especially true if the duct air is cold (<50°F), duct air
velocity is high (>2000 FPM), or duct %RH is high (>90%). If these conditions exist and
impingement is suspected, consult factory.
4. The duct air may be saturated with moisture (100% RH). A high limit humidistat/RH sensor is
recommended to prevent this. See Installation section.
Water in bottom of cabinet
1. Verify that pressure equalizing tubing is hooked up from top of electrode level canister to the tank.
2. Check steam distribution piping for obstructions.
3. Verify duct air velocity is less than 2000 FPM and manifold is not in a vertical down air flow.
4. Check for leaks at fittings and clamps in water supply lines.
5. Verify that tank access panel gasket is on lip of access hole and the access panel is secured
tightly.
6. Make sure the duct pressure and steam distribution back pressure does not total more than
6” WC.
Diagnostics
There are some diagnostic routines programmed into the PC board. If these routines detect a problem
the unit will shut down and display the error message on LCD, the “STATE” LED will be on in red.
1 FILL TIME OUT TO LOW LEVEL - - The low level switch has not closed after 45 minutes of fill
valve on time. This is only on initial start-up or after a complete drain down. Check: defective fill
valve, debris in fill valve inlet screen or on tank drain screen, water leakage from tank or inlet tubing,
no water flow or low water pressure, drain valve stuck open or leaking, defective low water level switch
(electrodes need to be cleaned).