68 EN/09.2019/G41 © STULZ GmbH – all rights reserved
cybercool 2 screw original insTrUcTions
6. Commissioning
NOTICE
The unit must be installed and connected in accordance with the chapter on „installation“ before
initial commissioning.
If the water temperature passes under 5°C or if the outside temperature is less than 0°C, you must add an
anti-freezing agent. We recommend to add the following quantities of glycol (indicated as percentage of
weight of the water quantity):
Ethylene glycol Water or outside air temperature
20% until -9,0°C
25% until -12,3°C
30% until -16,1°C
35% until -20,4°C
40% until -25,2°C
45% until -30,8°C
50% until -37,6°C
Propylene glycol Water or outside air temperature
25% until -10,7°C
30% until -14,0°C
35% until -17,6°C
40% until -21,5°C
45% until -26,0°C
50% until -32,4°C
WARNING
Risk of glycol intoxication
Do not swallow ethylene glycol. Ethylene glycol is highly toxic in oral ingestion.
Lethal dose: 0,4 g ethylene glycol/kg body weight, severe intoxication: already at 0,1 ml/kg.
Glycol is absorbed through the skin. Therefore immediately change clothing soaked with glycol.
Wear protective gloves made of rubber.
6.1 Filling of the water circuit
It is difficult to produce a homogeneous glycol mixture. You can purchase ready-made glycol mixtures.
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