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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.
Visual check
The coolant should be checked for its colour and any particles or sediments floating in it.
➤ Take a coolant sample and analyze.
The coolant is discoloured and/or has contains floating particles. Change the coolant.
Antifreeze concentration measurement
An instrument (e.g. refractometer) is used to check antifreeze concentration.
Maximum frost protection is ensured with an antifreeze concentration of 55% by volume, as frost
protection and heat transfer properties deteriorate beyond this point. Higher concentration also
leads to higher operating temperature.
1.
The engine can be damaged if the antifreeze concentration is insufficient.
Corrosion
Damage to the cooling system
Engine casing fracture
➤ Check coolant.
➤ Protect the coolant against frost.
➤ Top up as necessary.
2. Use the coolant tester as instructed by the manufacturer to test the coolant.
If the concentration of antifreeze is too low, Change the coolant.
Performing final work steps:
1. Screw in the cap and close the service cover.
2. Close the doors.
10.4.1.3 Mixing coolant
Never use water without coolant additive. Water alone is corrosive at engine operating tempera‐
ture. Water alone does not offer sufficient protection from boiling or freezing.
The coolant is a mixture of clean, fresh water and antifreeze with corrosion inhibitor.
For reasons of corrosion protection and the need to raise the boiling point, the coolant must remain
in the cooling system throughout the year.
The maximum permissible coolant life is 2 years.
➤ Follow coolant recommendations in chapter 2.6.4.
Preparing coolant
Precondition Coolant must meet the specification of ASTM D4985.
10 Maintenance
10.4 Engine maintenance
No.: 9_9570 07 USE
Operator Manual Screw Compressor
M250 SIGMA CONTROL MOBIL
115
Содержание M250
Страница 2: ...Original instructions KKW M250 2 07 en Z1 SBA MOBILAIR 20160901 155921...
Страница 8: ...Contents vi Operator Manual Screw Compressor M250 SIGMA CONTROL MOBIL No 9_9570 07 USE...
Страница 12: ...List of Illustrations x Operator Manual Screw Compressor M250 SIGMA CONTROL MOBIL No 9_9570 07 USE...
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Страница 372: ...13 Annex 13 5 Fuel circulation diagram 358 Operator Manual Screw Compressor M250 SIGMA CONTROL MOBIL No 9_9570 07 USE...
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