Fig. 28 Checking the coolant level
1
Coolant cooler
2
Coolant expansion tank
A
Maximum mark (FULL)
B
Minimum mark (LOW)
3
Filler neck with cap
4
Overflow
5
Connection hose to drive engine
1. Check the coolant level inside the coolant expansion tank.
When the coolant level falls below the
minimum mark
B
: Replenish the coolant.
2. Shut the enclosure.
Arrange for the cause of the coolant loss to be determined and rectified.
10.3.1.2 Checking the coolant
The coolant should be checked in line with the maintenance schedule to ensure quality and long
service life.
Coolant quality can be determined by the following parameters:
■ Visual check
■ Antifreeze concentration measurement
➤ Unscrew and remove the expansion tank filler cap
3
.
Performing a visual check:
The coolant should be checked for discolouration and any floating particles (flocculation).
➤ Take a coolant sample and analyse it.
If the coolant is heavily discoloured and/or contains floating particles: Change the coolant.
Measuring the antifreeze concentration:
A coolant tester (e.g. refractometer) is used to check the proportion of antifreeze in the coolant.
10 Maintenance
10.3 Drive engine maintenance
102
Operating Manual Portable Rotary Screw Compressor
MOBILAIR M27 PE
No.: 9_9548 22 HCE