15
maintenance
* Range = Difference between hot water temperature coming to tower and cold water
temperature leaving tower.
EXAMPLE: 159.1 m
3
/hr circulating rate, 10°C cooling range. To main-
tain 4 concentrations, the required blowdown is 0.458% or .00458 times
159.1 m
3
/hr, which is 0.7 m
3
/hr.
If tower is operated at 4 concentrations, circulating water will contain four
times as much dissolved solid as the makeup water, assuming none of the
solids form scale or are otherwise removed from the system.
When water treatment chemicals are added, they should not be in-
troduced into the circulating water system via the cold water basin
of the cooling tower. Water velocities are lowest at that point, which
results in inadequate mixing.
Cooling Tower Inspection and Maintenance
Microorganisms including Legionella bacteria can exist in premise
plumbing including cooling towers. The development of an effective
water management plan (WMP) and implementation of maintenance
procedures are essential to prevent the presence, dissemination and
amplification of Legionella bacteria and other waterborne contami-
nants throughout premise plumbing. Before operating the cooling
tower, the water management plan and maintenance procedures
must be in place and regularly practiced.
In addition, the following steps are recommended:
Do NOT attempt any service unless the fan motor is locked out.
• Consult a knowledgeable water treatment professional to clean and
treat your cooling tower. See
Tower Startup
section of this manual.
• Cooling towers must be cleaned and disinfected regularly in accordance
with local public health services and recommendations.
Note
Warning
e
g
n
a
R
g
n
il
o
o
C
s
n
o
it
a
r
t
n
e
c
n
o
C
f
o
r
e
b
m
u
N
X
5
.
1
X
0
.
2
X
5
.
2
X
0
.
3
X
0
.
4
X
0
.
5
X
0
.
6
3°C
7
.
8
3
.
5
2
.
8
1
.
1
1
.
8
0
.
6
0
.
6°C
5
.
1
8
7
.
1
5
.
8
3
.
5
2
.
8
1
.
4
1
.
8°C
3
.
2
8
1
.
1
8
7
.
8
5
.
8
3
.
8
2
.
2
2
.
11°C
1
.
3
8
5
.
1
5
0
.
1
8
7
.
1
5
.
8
3
.
0
3
.
14°C
9
.
3
8
9
.
1
2
3
.
1
8
9
.
4
6
.
8
4
.
8
3
.
.
e
t
a
r
r
e
t
a
w
g
n
it
a
l
u
c
ri
c
e
h
t
f
o
%
2
0
.
0
f
o
t
fi
r
d
n
o
d
e
s
a
b
e
r
a
s
r
e
il
p
it
l
u
M
