Installation and Maintenance
EHU-600 Series Humidifiers
26
f.
Never fill the tank more than 2/3 full. Watch the tank outside
wall for the liquid level. Stop if foaming occurs and fills the tank
more than 2/3 full.
g.
The 2/3 full requirement is to keep acid from attacking the
electrical connections inside the top of the tank.
h.
Let the tank cleaning action take place for 15 minutes. Drain the
fluid out the tank bottom. Rinse the tank twice with clean water.
i.
Observe the inside to determine if another treatment is necessary.
j.
It is not necessary for the electrodes to be cleaned down to bare
metal. Removal of major accumulations is the only requirement.
k.
Helpful Hints:
• Keep a rotating spare tank for installation in each humidifier.
Cleaning can be done when convenient, not rushed.
• Check the drain valve, tank drain adapter and tubing for
proper operation and good flow when the tank is drained prior
to removal.
• On EHU-600 models, it is easier to disconnect the electrical
wires back at the contactor, not on top of the steam
generator tank.
l.
Re-install the steam generator tank. Make sure all electrical
connections are tight; see Page 6. Check unit for proper
operation.
4.
Electrode Installation
Models EHU-601 and EHU-602 – Three Phase
a.
Clean the inside of the steam generator thoroughly and rinse
with clear water.
b.
High voltage units are supplied with a barrier/drain screen
assembly in the lower tank half to reduce the possibility of
arcing and increase electrode life. Inspect the barrier/drain
screen assembly and replace if necessary. (See Figures 26-2,
26-3, and 27-1.)
c.
Make sure terminals and contact area on electrode top plates
are clean and free of rust. Wire brush, if necessary. Set the
electrodes in place. Be sure to use the same pair of holes on
all electrodes. If you do not know which position (set of holes)
to use, follow these recommendations (See Figure 26-1).
NOTE: The EHU-600 electrodes are not adjustable in the field.
However, a set of closer spaced electrodes for low water conductivity
are available. Consult the factory or your Armstrong Representative.
Figure 26-1: Model EHU-601 and EHU-602
3 Ph Electrode Installation
(Top View)
Figure 26-2: Top view
Barrier Assembly
Figure 26-3: Side View
Barrier Assembly
Check for equal spacing, 3 places.
Use these holes for Position No. 1
Position No. 3 Shown
Use these holes for Position No. 2
