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Maintenance
Caution regarding drainage during winter time
Drain valve
Air venting
Air vent valve
Water maintenance standard
If chilled/heating water is not maintained by following standard, corrosion and scale accumulation may occur. It may
decrease not only the performance of heat exchange, but also cause product malfunction due to heat exchanger
damage by freezing. Extra care is necessary, and water should be maintained by expert to keep the water within the
standard.
Item
pH 25°C (77°F)
Electric conductivity
(mS/m, 25°C (77°F))
Basic item
{μS/cm, 25°C (77°F)}
Chloride ion (mgCl
Sulfate ion (mgSO
64
English
Chilled water system
Circulation water
(Below 20°C
Supply water
(68°F))
6.8 ~ 8.0
Below 40
Below 30
{Below 400}
{Below 300}
-
/l)
Below 50
Below 50
2-
/l)
Below 50
Below 50
4
When DVM CHILLER is not operated during winter time,
drain all water by opening drain valves in CHILLER
shown in figure and drain valves in the pipes.
Vent air by opening two air vent valves on inlet and
middle of the pipe of water side heat exchanger.
If air venting is not done properly, it is difficult to
maintain rated flow rate, and pipe corrosion or noise by
remaining oxygen may occur.
When venting air, be aware to prevent water get in to
the box.
Heating water system
Low level medium temperature
heating gauge
Circulation water
(Over 20°C (68°F)
below 60°C (140°F))
6.8 ~ 8.0
7.0 ~ 8.0
Below 30
{Below 300}
Below 50
Below 50
Effect
Forming
Supply water Corrosion
scale
7.0 ~ 8.0
O
O
Below 30
{Below 300}
Below 50
O
Below 50
O
O
O
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