HDWA-SVX001D-EN
23
Freeze Protection
For unit operation in a low temperature environment,
adequate protection measures must be taken against
freezing. Refer to the following tables for adjusted
settings and recommended ethylene glycol and
propylene glycol solution strengths.
Table 7. Agility chiller control settings based on ethylene glycol percentage
Ethylene Glycol
Percentage, %
Solution Freeze Point
Minimum Recommended LRTC
Minimum Recommended LWTC
°F
°C
°F
°C
°F
°C
0
32.0
0.0
28.6
-1.9
34.0
1.1
2
31.0
-0.6
27.6
-2.5
33.0
0.5
4
29.7
-1.3
26.3
-3.2
31.7
-0.2
5
29.0
-1.7
25.6
-3.6
31.0
-0.6
6
28.3
-2.0
24.9
-3.9
30.3
-0.9
8
26.9
-2.8
23.5
-4.7
28.9
-1.7
10
25.5
-3.6
22.1
-5.5
27.5
-2.5
12
23.9
-4.5
20.5
-6.4
25.9
-3.4
14
22.3
-5.4
18.9
-7.3
24.3
-4.3
15
21.5
-5.9
18.1
-7.7
23.5
-4.7
16
20.6
-6.3
17.2
-8.2
22.6
-5.2
18
18.7
-7.4
15.3
-9.3
20.7
-6.3
20
16.8
-8.4
13.4
-10.3
18.8
-7.3
22
14.7
-9.6
11.3
-11.5
16.7
-8.5
24
12.5
-10.8
9.1
-12.7
14.5
-9.7
25
11.4
-11.4
8.0
-13.3
13.4
-10.3
26
10.2
-12.1
6.8
-14.0
12.2
-11.0
28
7.7
-13.5
4.3
-15.4
9.7
-12.4
30
5.1
-15.0
1.7
-16.8
7.1
-13.8
32
2.3
-16.5
-1.1
-18.4
5.0
-15.0
34
-0.7
-18.2
-4.1
-20.1
5.0
-15.0
35
-2.3
-19.0
-5.7
-20.9
5.0
-15.0
36
-3.9
-19.9
-7.3
-21.8
5.0
-15.0
38
-7.3
-21.8
-10.7
-23.7
5.0
-15.0
40
-10.8
-23.8
-14.2
-25.7
5.0
-15.0
Table 8. Agility chiller control settings based on propylene glycol percentage
Propylene
Glycol
Percentage, %
Solution Freeze Point
Minimum Recommended LRTC
Minimum Recommended LWTC
°F
°C
°F
°C
°F
°C
0
32.0
0.0
28.6
-1.9
34.0
1.1
2
31.0
-0.6
27.6
-2.4
33.0
0.6
4
29.9
-1.2
26.5
-3.1
31.9
-0.1
5
29.3
-1.5
25.9
-3.4
31.3
-0.4
6
28.7
-1.8
25.3
-3.7
30.7
-0.7
8
27.6
-2.5
24.2
-4.4
29.6
-1.4
10
26.4
-3.1
23.0
-5.0
28.4
-2.0
12
25.1
-3.8
21.7
-5.7
27.1
-2.7
14
23.8
-4.6
20.4
-6.5
25.8
-3.5
15
23.1
-5.0
19.7
-6.8
25.1
-3.8
16
22.4
-5.4
19.0
-7.2
24.4
-4.2
18
20.9
-6.2
17.5
-8.1
22.9
-5.1
20
19.3
-7.1
15.9
-9.0
21.3
-6.0
