Installation Operation Maintenance

InstallationWinter freeze protectionDuring negative ambient airtemperature chilled water pipingmust be fully insulated. Ensure thatall safeties are taken to preventfrost damage during negativeambient air temperature. Thefollowing systems can be used:• Electrical heater mounted on allwater piping exposed tonegative temperatures.• Start chilled water pump duringnegative ambient airtemperature.• Add ethylene glycol in the chilledwater.• Drain water-circuit, however beaware of corrosion process whendrained.CAUTION: There is a risk of freezeupof the evaporator circuit due tointernal refrigerant migration if thecondenser circuit is maintained at alow temperature (below 0°C) for along period during the cold season.If necessary, provide isolationvalves on the condenser watercircuit (CGWN). CCUN is protectedagainst refrigeration migration by aliquid solenoid valve.Figure 13 - Freezing point versus ethylene glycol percentage0-1 0Brine temperature (°C)-2 0-3 0321-4 0-5 00 1 0 2 0 3 0 4 0 5 0 6 01. Liquid2. Freezing without burst effect3. Freezing with burst effect% Ethylene glycolCG-SVX06A-E425