Safety Concerns
2-2
Heat Transfer Fluid (HTF)
*CAUTION! At no time should automobile antifreeze be used in your DRYAIR system.
The use of automobile antifreeze will void your DRYAIR warranty. Always use
propylene glycol as the HTF.*
•
DRYAIR pre-mixed HTF is made up of 50% “Dowfrost ® HTF” or “Boss Chill PG” and
50% water, by weight, to provide freeze protection down to -28°F (-33°C).
•
The Glycol/Water Mixture Chart (Table 2-1) will provide you with more information on the
proper mixture for your area.
Table 2-1 Glycol/Water Mixture Chart
*CAUTION! Whenever coupling or uncoupling the quick-couplers, make sure that the isolation
valves are closed and the pump is turned off. Failure to do so may result in injury caused by hot
HTF.*
•
Always use soft water with a neutral pH level (approx. 7) when preparing HTF for use in the
ES200.
For MSDS information regarding propylene glycol please see Appendix – Heat Transfer Fluid
Information.
Percent Propylene Glycol
Freezing Point
By Mass
By Volume
ºF
ºC
0.0
0.0
32.0
0.0
10.0
9.6
26.1
-3.2
20.0
19.4
17.9
-7.8
30.0
29.4
6.7
-14.0
40.0
39.6
-8.1
-22.3
50.0
49.9
-28.9
-33.8
60.0
60.0
-54.9
-48.3
