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Freeze Protection
For unit operation in a low temperature environment,
adequate protection measures must be taken against
freezing. Adjusted settings and recommended ethylene
Table 10. Freeze protection settings
Glycol
Solution Freeze
Percentage (%)
Point (°F)
0
32.0
2
31.0
4
29.7
5
29.0
6
28.3
8
26.9
10
25.5
12
23.9
14
22.3
15
21.5
16
20.6
18
18.7
20
16.8
22
14.7
24
12.5
25
11.4
26
10.2
28
7.7
30
5.1
32
2.3
34
-0.7
35
-2.3
36
-3.9
38
-7.3
40
-10.8
42
-14.6
44
-18.6
45
-20.7
46
-22.9
48
-27.3
50
-32.1
Important:
Data shown in the above table provides
protection against equipment damage.
Refer to selection software or product
support to verify unit performance and
leaving fluid temp capability of a specific
unit configuration.
RTHD-SVX01K-EN
Ethylene Glycol
Minimum
Minimum
Recommended
Recommended
Low Refrigerant
Leaving Water
Temp Cutout
Temp Cutout
(°F)
(°F)
28.6
35.0
27.6
34.0
26.3
32.7
25.6
32.0
24.9
31.3
23.5
29.9
22.1
28.5
20.5
26.9
18.9
25.3
18.1
24.5
17.2
23.6
15.3
21.7
13.4
19.8
11.3
17.7
9.1
15.5
8.0
14.4
6.8
13.2
4.3
10.7
1.7
8.1
-1.1
5.3
-4.1
2.3
-5.0
0.7
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
glycol solution strengths are contained in below table as
follows:
Propylene Glycol
Recommended
Solution Freeze
Low Refrigerant
Point (°F)
32.0
31.0
29.9
29.3
28.7
27.6
26.4
25.1
23.8
23.1
22.4
20.9
19.3
17.6
15.7
14.8
13.8
11.6
9.3
6.8
4.1
2.7
1.3
-1.8
-5.2
-8.8
-12.6
-14.6
-16.7
-21.1
-25.8
Installation Mechanical
Minimum
Minimum
Recommended
Leaving Water
Temp Cutout
Temp Cutout
(°F)
(°F)
28.6
35.0
27.6
34.0
26.5
32.9
25.9
32.3
25.3
31.7
24.2
30.6
23.0
29.4
21.7
28.1
20.4
26.8
19.7
26.1
19.0
25.4
17.5
23.9
15.9
22.3
14.2
20.6
12.3
18.7
11.4
17.8
10.4
16.8
8.2
14.6
5.9
12.3
3.4
9.8
0.7
7.1
-0.7
5.7
-2.1
4.3
-5.0
1.2
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
37
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