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Fig. 36 Recommended mixture ratio for coolant
1
Anti-corrosion agent/antifreeze
2
Water
➤ Observe the coolant recommendations given in chapter 2.6.4!
Preparing the coolant:
Precondition The coolant used must meet the specification of ASTM D4985.
➤ The coolant should be mixed in the proportions specified by the manufacturer.
Coolant mixture table:
Proportions [% vol.]
Frost protection up to approx. [°F]
Corrosion inhibitor/anti‐
freeze
Water
50
50
−35
Tab. 75 Coolant mixture table
Do not use a higher concentration than 55% vol. of anti-corrosion agent/antifreeze, even at
extremely low ambient temperatures. Maximum frost protection is achieved with 55% vol. of
anti-corrosion agent/antifreeze. This corresponds to frost protection down to approx. -49°F.
The concentration of antifreeze should not be less than 33%, since corrosion protection can
no longer be guaranteed and heat transfer properties deteriorate beyond this point!
10.4.1.4 Filling/refilling the coolant
In order to ensure optimum frost/corrosion protection and prevent the build-up of deposits (sludge)
in the cooling circuit, the proportion of antifreeze in the coolant should not be permitted to fall below
33%. Replenishing solely with water dilutes the antifreeze concentration and is therefore prohibi‐
ted.
Ensure that there is sufficient space for the coolant to expand without overflowing when hot.
Precondition The «battery isolating switch» is switched off.
1. Loosen and remove the coolant expansion tank filler cap.
2. Mix a quantity of coolant as per the table and replenish to the level indicated.
Replenish the coolant to just below the
maximum mark
A
.
3. Replace the plug in the filler neck.
4. Turn on the «battery isolating switch».
5. Attach the panel.
6. Start the engine and allow to run in IDLE for about 1 minute.
10 Maintenance
10.4 Drive engine maintenance
No.: 901779 08 USE
Operator Manual Portable Rotary Screw Compressor
MOBILAIR M58utility SIGMA CONTROL SMART
107