➤ The coolant should be mixed in the proportions given by the manufacturer.
KAESER coolant mixture table
Antifreeze
Water
Frost protection to [°F]
1 part
2 parts
–0.4
1 part
1.5 parts
−13
1 part
1 part
−34.6
Tab. 76 KAESER coolant mixture table
The concentration of antifreeze should not be less than 33% for ensured corrosion protection.
10.4.1.4 Filling and topping up the coolant
The proportion of antifreeze in the coolant should not fall below 33% to ensure frost and corrosion
protection and prevent the build up of deposits in the cooling circuit. Topping up with water alone
dilutes the antifreeze concentration and is forbidden.
Make sure that there is sufficient room for hot coolant to expand without overflowing.
Precondition The «battery isolating switch» is turned off.
1. Unlock the service cover of the coolant expansion tank (on the roof) from inside and lift up.
2. Slowly open the cap on the coolant filler by a quarter to half of a turn to allow pressure to es‐
cape.
3. Then remove the filler cap completely.
4. Mix coolant for topping up according to the table and top up the level to not higher than 3 cm
below the filling neck.
The coolant must be visible in the sight glass.
5. Screw in the cap of the filler plug and close the service cover.
6. Open the left-rear door.
7. Turn on the «battery isolating switch».
8. Close all the doors.
9. Start the engine and allow to IDLE for about 1 minute.
10. Stop the engine.
11. Open both left-hand doors.
12. Check the coolant level.
If the coolant level in the expansion tank has decreased: Replenish the coolant.
13. Visually inspect for leaks.
14. Close the doors.
10.4.1.5 Draining the coolant
Precondition The machine has cooled down.
The «battery isolating switch» is turned off.
10 Maintenance
10.4 Engine maintenance
116
Operator Manual Screw Compressor
M250 SIGMA CONTROL MOBIL
No.: 9_9570 07 USE