Propylene glycols
l DOWCAL 200
l Clariant Antifrogen L
These glycols already include corrosion inhibitors. Do not add any other inhibitor. Do not mix different glycol qualities because there can
be harmful chemical interactions.
The glycol concentration of the coolant must be 25–55% by volume, according to the specified ambient temperature. Higher
concentration reduces cooling capacity. Lower concentration results in biological growth and inadequate amount of corrosion inhibitors.
Antifreeze must be mixed with purified water according to 6.3.1 Quality Requirements for the Purified Water.
6.3.4 Temperature of the Coolant
To gain full performance of the product, the temperature of the coolant entering the system module must be a maximum of 45 °C
(113 °F). While circulating inside the cooling element, the liquid transfers the heat produced by the power semiconductors and other
components. The temperature rise of the coolant during the circulation is typically less than 7 °C (13 °F) for INU modules and less than
10 °C (18 °F) for AFE modules. Typically, 95% of the power losses are dissipated in the coolant. It is recommended to equip the cooling
circulation with temperature supervision.
6.4 Cooling System
6.4.1 Materials
CAUTION
DAMAGE TO THE SYSTEM FROM INCORRECT MATERIALS
Using steel, copper, or copper alloy pipes or parts in contact with the coolant damages the system.
l Do not use pipes or parts made of steel, copper, or alloys that include copper. If metallic pipes are used in the cooling system,
use aluminum or stainless steel pipes. Use AISI316 for steel, and, for example, EN-AW6060, EN-AW6063, or EN-AW6082 for
aluminum.
Allowed materials in the cooling system
If they are compatible with the coolant, these materials are allowed in the cooling system:
l Aluminum
l Stainless steel AISI 304/316
l Plastic*
l Elastomers (EPDM, NBR, FDM)*
* If plastic or elastomers are used, check material compatibility within the temperature range of the coolant. See 10.8 Technical Data.
Do not use PVC, copper, brass, steel or other materials not compatible with the heat sink material or coolant.
Recommended material for plastic pipes
l PA11
l PA12
l PEX with oxygen barrier
l PEX-AL-PEX
40 | Danfoss Drives Oy © 2024.03 AJ475942178716en-000101 / 172K2848A
Design Guide | iC7 Series Liquid-cooled System Modules
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