Nanni Q2400 Series, User Manual

Page: 26 / 110

26
S03 FLUIDS
WATER QUALITY FOR MIXING WITH COOL-
ANT CONCENTRATE
Engine coolants are a combination of three chemical
components: ethylene glycol (EG) or propylene glycol (PG)
antifreeze, inhibiting coolant additives, and quality water.
Water quality is important to the performance of the
cooling system. Deionized or demineralized water is
recommended for mixing with ethylene glycol and
propylene glycol base engine coolant concentrate.
All water used in the cooling system should meet the
following minimum specifications for quality:
Chlorides <40 mg/L
Sulfates <100 mg/L
Total solids <340 mg/L
Total dissolved I hardness <170 mg/L
pH 5.5—9.0
IMPORTANT!
Do not use bottled drinking water because it often con-
tains higher concentrations of total dissolved solids.
Freeze Protection
The relative concentrations of glycol and water in the en -
gine coolant determine its freeze protection limit.
Ethylene Glycol Freeze Protection Limit
40% -24°C (-12°F)
50% -37°C (-34°F)
60% -52°C (-62°F)
Propylene Glycol Freeze Protection Limit
40% -21°C (-6°F)
50% -33°C (-27°F)
60% -49°C (-56°F)
DO NOT use a coolant-water mixture greater than 60%
ethylene glycol or 60% propylene glycol.
TESTING COOLANT FREEZE POINT
The use of a hand-held coolant refractometer is the
quickest, easiest, and most accurate method to determine
coolant freeze point. This method is more accurate than
a test strip or a float-type hydrometer which can produce
poor results.
A coolant refractometer can be used to provides an eco-
nomical solution to accurate freeze point determination
in the field.
To use this tool:
1. Allow cooling system to cool to ambient tempera-
tures.
2. Open heat-exchanger cap to expose coolant.
3. With the included dropper, collect a small coolant
sample.
4. Open the lid of the refractometer, place one drop of
coolant on the window and close the lid.
5. Look through the eyepiece and focus as necessary.
6. Record the listed freeze point for the type of coolant
(ethylene glycol coolant or propylene glycol) being
tested.
Part Number 945400245
Image with a Drop of 50/50 Coolant
Placed on the Refractometer Window