Lauda UC 2 - Page 19

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Only an authorized technical service can adjust the antifreeze set point. The following table shows the
ethylene glycol concentration and the antifreeze adjustment required:
Glycol concentration (4) and
antifreeze adjustment
Min Ambient Temperature
0ºC or more
Less than 0ºC until
-5ºC
Less than -5ºC until
-15ºC
Cold Water
Set Point
7ºC or more
0%
0ºC
15%
-5ºC
30%
-15ºC
Less than 7ºC
until 5ºC
15%
-5ºC
15%
-5ºC
30%
-15ºC
Less than 5ºC
until 0ºC
30%
-15ºC
30%
-15ºC
30%
-15ºC
Less than 0ºC
until -5ºC
30%
-15ºC
30%
-15ºC
30%
-15ºC
Less than -5ºC
until -10ºC
40%
-20ºC
40%
-20ºC
40%
-20ºC
Glycol concentration (4) and
antifreeze adjustment
Min Ambient Temperature
32ºF or more
Less than 32ºF until
23ºF
Less than 23ºF until
5ºF
Cold Water
Set Point
45ºF or more
0%
32ºF
15%
23ºF
30%
5ºF
Less than 45ºF
until 41ºF
15%
23ºF
15%
23ºF
30%
5ºF
Less than 41ºF
until 32ºF
30%
5ºF
30%
5ºF
30%
5ºF
Less than 32ºF
until 23ºF
30%
5ºF
30%
5ºF
30%
5ºF
Less than 23ºF
until 14ºF
40%
-4ºF
40%
-4ºF
40%
-4ºF
(4) The ethylene glycol percentage is given as % measured as weight of the total mixture. In case of any
modification in the quantity of water in the installation, the concentration of ethylene glycol should be
checked.
If more volume is required it is necessary to keep the ethylene glycol concentration
Do not use automotive antifreeze. Use lab grade ethylene glycol only! Do not use an ethylene glycol
concentration above 40%; this would damage the water pump.