Trane Technologies Agility HDWA PC 747 - Freeze Protection

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HDWA-SVX002C-EN
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.
• LRTC = Leaving Refrigerant Temperature Cutout
• LWTC = Leaving Water Temperature Cutout
Table 9. 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 10. 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
Installation: Mechanical