53
Maintenance
Nortec GS
2583701_C_EN_1812_Nortec-GS_OM
the low voltage terminal strip can also be used to initiate a full tank blowdown at any time.
Water Quality
The water quality requirements for the Nortec GS humidifier are shown in
. Do-it-yourself kits
are available to test hardness in the feed water. You can also contact your local municipality for a water
quality report, or order a Condair water test kit.
Table 10: Water Quality Requirements
Water Type
Hardness
gpg (PPM)
Alkalinity (pH)
Chloride (PPM)
Potable
0-15 (0-256)
5-8
0-50
Treated
0-0.99 (0-17)
5-8
0-50
6.4.1
Adjusting Blowdown Settings
Due to the wide range of water quality in different locations, it is important to adjust blowdown to suit
the local water conditions. Use the following procedure to adjust the blowdown rate and FTBD interval
for the water conditions at your site.
1. Test the quality of the feed water to determine the hardness and the chloride levels.
2. Then set the blowdown rate as follows:
a.
, and make a note of the recommended minimum blowdown rate for
the hardness level of the feed water.
b. Then refer to
, and make a note of the recommended minimum blowdown
rate for the chloride level in the feed water.
c. Set the
on the Nortec GS humidifier to the
higher
of the two noted values.
3. Set the FTBD interval as follows:
a.
, and make a note of the recommended maximum FTBD interval value for the
hardness level of the feed water.
b.
, and make a note of the recommended maximum FTBD interval value for the
chloride level in the feed water.
c. Set the
on the humidifier to the
lesser
of the two noted values.
4. Once the base settings are set, monitor the water quality and maintenance history periodically, and
adjust the settings accordingly.
Note:
Factory tests have shown that increasing the blowdown rate reduces scale build-up, while
reducing the FTBD interval reduces the chloride concentration levels in the tank. The adjusted set
-
tings should reflect a balance between reducing concentration levels and minimizing water usage.
Table 11: Blowdown and FTBD Settings Related to Hardness of Water
Feed Water Hardness
gpg (PPM)
Recommended Minimum
Blowdown Rate (%)
Recommended Maximum
FTBD Interval (h)*
0-3.5
(0-60)
12
72
3.5-7
(60-120)
25
72
7-10.5
(120-180)
40
72
10.5-20.5
(180-350)
60
48
> 20.5
(> 350)
Not recommended for the Nortec GS humidifier without treat
-
ment of the water. Contact your local Condair representative.
* Weighted hours
