Lauda VC 1200, Руководство по эксплуатации

Страница: 30 / 100

5 Commissioning
5.1 Heat transfer liquids
Note:
n
The heat transfer liquids each cover a recommended temperature range
and must be suitable for the temperature range of your application.
n
At the lower limit of the temperature range, the heat transfer liquid
becomes more viscous and influences temperature stability, pump
power and cooling capacity. The formation of vapours and odours
increases in the upper range. Therefore, only use all of the temperature
range if required. Particularly with Aqua 90 (water), ice forms which can
result in destruction of the device.
n
Never use contaminated or degenerated heat transfer liquid.
n
Observe the safety data sheet of the heat transfer liquid. You can
request the safety data sheets of the heat transfer liquid at any time if
required.
Table 5: Approved heat transfer liquids
LAUDA
designation
Chemical des-
ignation
Temperature
range in °C
Viscosity (kin) in
mm²/s
(at 20 °C)
Viscosity (kin) in
mm²/s for
temperature
Container size
Catalogue number
5 L 10 L 20 L
Kryo 30
Monoethylene
glycol / water
mixture
-30 – 90 4 50 at -25 °C LZB 109 LZB 209 LZB 309
Aqua 90
decalcified
water
5 – 90 1 --- LZB 120 LZB 220 LZB 320
Note the following for Kryo 30:
n
The water content is reduced during long operating at higher tempera-
tures and the mixture becomes flammable (flash point 119 °C). Check
the mixture ratio using a hydrometer.
n
The alkaline earth ions content (hardness) of the water must be between
0.71 mmol/L and 1.42 mmol/L (equivalent to 4.0 and 8.0 °dH). Harder
water results in lime deposits in the device.
n
The pH value of the water must be between 6.0 and 8.5.
n
Distilled, deionised, demineralised (DM) water or seawater must not be
used due to their corrosive properties. Ultra-pure water and distillates
are suitable as a medium after addition of 0.1 g soda (Na
2
CO
3
, sodium
carbonate) per litre of water.
n
Any chlorine content in the water must be strictly avoided. Do not add
any chlorine to the water. Chlorine is contained, for example, in cleaning
agents and disinfectants.
n
The water must be free of impurities. Water containing iron is unsuitable
due to rust formation and untreated river water is unsuitable due to algae
formation.
n
The addition of ammonia is not permitted.
Heat transfer liquid water
V08 Variocool 30 / 97