Fronius CU 1800 - Replacing the Cooling Liquid; Replacing Seal of High Pressure Pump

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Replacing the
cooling liquid
IMPORTANT! The cooling liquid must be changed every 3 months.
1. Place a su󰀩ciently large container (1) under the drain connection.
Capacity: approx. 10l
2. Open the ball valve (2) to discharge the cooling liquid.
3. Close the ball valve.
4. Fill in fresh cooling liquid, as described in chapter INSTALLATION, section FILL
IN COOLING LIQUID.
(1)
(2)
Replacing seal
of high pressure
pump
NOTE! Coolant leakage from seal:
Due to its specic structure, it is not possible to completely exclude leakage
from the seal. Approximate value is max. 3 cm³ / h.
The intended seal lifetime before replacement is 8000 hours.
IMPORTANT! The pump seal must be checked for excessive leakage every 6 months!
1. Remove the back panel.
2. Check the pump seal for excessive leakage.
3. In case of leakage, change the seal.