Installation and Maintenance
EHU-600 Series Humidifiers
23
Figure 23-1: Tank filled with mineral
buildup.
Chart 23-1: Typical Minerals
Analysis of water, in parts per million,
Found in Water
except for pH and color
Constituent or property
River
1
Well
2
Canal
3
Lake
4
Silica (SiO
3
) ____________
5.4
41
6.6
11
Iron (Fe) ______________
.11
.04
.11
.10
Calcium (Ca) ___________
9.6
50
83
2.9
Magnesium (Mg) ________
2.4
4.8
6.7
9.5
Sodium (Na) ___________
4.2
10
12
8690
Potassium (K) __________
1.1
5.1
1.2
138
Carbonate (CO
3
) ________
0
0
0
3010
Bicarbonate (HCO
3
) _____
26
172
263
3600
Sulfate (SO
4
) ___________
12
8.0
5.4
10500
Chloride (Cl) ___________
5.0
5.0
20
668
Fluoride (F) ____________
.1
.4
.2
—
Nitrate (NO
3
) ___________
3.2
20
1.3
5.8
Dissolved solids ________
64
250
310
25000
Hardness _____________
34
145
235
46
Color _________________
7
0
97
2
pH ___________________
6.9
7.9
7.7
9.8
1-Stream in Connecticut 2-Logan County, CO 3-Drainage from Everglades, FL 4-Northcentral North Dakota
The drain cycle: EHU Series humidifiers have a built in blowdown
circuit to intermittently purge mineral accumulations from the water.
This is a bottom blowdown, so if minerals stick to the sides of the steam
generator, they will accumulate. The standard drain interval is every 30
minutes for the EHU-600 and every 15 minutes for the EHU-601/602.
Drain duration is automatically adjusted based on water hardness. If
the water is very hard an increased drainage EPROM may be needed.
Please consult the factory.
Water related maintenance: There are two types of water related
maintenance required in EHU Series humidifiers:
3.
Tank Cleaning
The tank is full of white or light brown colored mineral buildup. This
buildup may be anywhere from soft and chalky to rock hard.
Tank cleaning can usually be handled one of five ways:
a.
Mechanical: Wire brush or scrape electrodes and tank walls
clean. NOTE: If cleaning mechanically it is not necessary to
clean the electrodes to the bare metal. Removal of major
accumulations is the only requirement.
b.
Chemical: Commercial Muriatic acid preparations work well
on most accumulations. See Section 3, "Steam Generator
Cleaning Procedure."
Caution: Muriatic acid can cause severe chemical burns if not
handled properly. Wear rubber gloves and eye protection when
using. Read and follow carefully the safety procedures on the
chemical package.
