Maintenance, Water treatment – SPX Cooling Technologies MARLEY CLASS F400 User Manual
Page 8
8
ELECTRIC MOTOR
–Lubricate and maintain each electric motor in accordance
with the manufacturer’s instructions. If repair work is necessary, contact the
nearest representative of the motor manufacturer. See Warranty Section of
the Marley Electric Motors User Manual.
FAN
–Inspect fan blade surfaces every six months. For detailed maintenance
information, refer to the Fan User Manual.
GEAREDUCER
–Make weekly and monthly oil checks. Inspect internal parts
during seasonal oil change. Refer to the Geareducer User Manual for detailed
maintenance instructions.
PAINTING
–Periodically clean and, if necessary, recoat all metal parts subject
to corrosion.
Water Treatment
BLOWDOWN
–Blowdown, or bleed-off, is the continuous removal of a portion
of the water from the circulating system. Blowdown is used to prevent the
dissolved solids from concentrating to the point where they will form scale.
The amount of blowdown required depends upon the cooling range (the dif-
ference between the hot and cold water temperatures) and the composition
of the make-up water (water added to the system to compensate for losses
by blowdown, evaporation and drift). The following table shows the amount
of blowdown required to maintain different concentrations with various cool-
ing ranges:
BLOWDOWN–% OF CIRCULATING RATE
e
g
n
a
R
g
n
il
o
o
C
s
n
o
it
a
rt
n
e
c
n
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C
f
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N
X
5
.
1
X
0
.
2
X
5
.
2
X
0
.
3
X
0
.
4
X
0
.
5
X
0
.
6
)
C
°
8
7
.
2
(
F
°
5
8
7
.
8
3
.
5
2
.
8
1
.
1
1
.
8
0
.
6
0
.
)
C
°
6
5
.
5
(
F
°
0
1
8
5
.
1
8
7
.
1
5
.
8
3
.
5
2
.
8
1
.
4
1
.
)
C
°
3
3
.
8
(
F
°
5
1
8
3
.
2
8
1
.
1
8
7
.
8
5
.
8
3
.
8
2
.
2
2
.
)
C
°
1
1
.
1
1
(
F
°
0
2
8
1
.
3
8
5
.
1
5
0
.
1
8
7
.
1
5
.
8
3
.
0
3
.
)
C
°
9
8
.
3
1
(
F
°
5
2
8
9
.
3
8
9
.
1
2
3
.
1
8
9
.
4
6
.
8
4
.
8
3
.
.
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%
2
0
.
0
f
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ir
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maintenance