Installation Mechanical
44
RTAF-SVX001K-EN
Table 19. Propylene glycol — low evaporator refrigerant temperature cutout (LERTC) and low water temperature
cutout (LWTC)
Unit Sizes 115 to 270 tons
Unit Sizes 280 to 520 tons
Glycol
Percentage
(%)
Solution
Freeze Point
(°F)
Minimum
Recommended
LERTC (°F)
Minimum
Recommended
LWTC (°F)
Glycol
Percentage
(%)
Solution
Freeze Point
(°F)
Minimum
Recommended
LERTC (°F)
Minimum
Recommended
LWTC (°F)
0
32.0
28.6
35.0
0
32.0
32.0
37.0
2
31.0
27.6
34.0
2
31.0
29.5
36.0
4
29.9
26.5
32.9
4
29.9
28.4
34.9
5
29.3
25.9
32.3
5
29.3
27.8
34.3
6
28.7
25.3
31.7
6
28.7
27.2
33.7
8
27.6
24.2
30.6
8
27.6
26.1
32.6
10
26.4
23.0
29.4
10
26.4
24.9
31.4
12
25.1
21.7
28.1
12
25.1
23.6
30.1
14
23.8
20.4
26.8
14
23.8
22.3
28.8
15
23.1
19.7
26.1
15
23.1
21.6
28.1
16
22.4
19.0
25.4
16
22.4
20.9
27.4
18
20.9
17.5
23.9
18
20.9
19.4
25.9
20
19.3
15.9
22.3
20
19.3
17.8
24.3
22
17.6
14.2
20.6
22
17.6
16.1
22.6
24
15.7
12.3
18.7
24
15.7
14.2
20.7
25
14.8
11.4
17.8
25
14.8
13.3
19.8
26
13.8
10.4
16.8
26
13.8
12.3
18.8
28
11.6
8.2
14.6
28
11.6
10.1
16.6
30
9.3
5.9
12.3
30
9.3
7.8
14.3
32
6.8
3.4
9.8
32
6.8
5.3
11.8
34
4.1
0.7
7.1
34
4.1
2.6
9.1
35
2.7
-0.7
5.7
35
2.7
1.2
7.7
36
1.3
-2.1
5.0
36
1.3
-0.2
6.3
38
-1.8
-5.0
5.0
38
-1.8
-3.3
5.0
40
-5.2
-5.0
5.0
40
-5.2
-5.0
5.0
42
-8.8
-5.0
5.0
42
-8.8
-5.0
5.0
44
-12.6
-5.0
5.0
44
-12.6
-5.0
5.0
45
-14.6
-5.0
5.0
45
-14.6
-5.0
5.0
46
-16.7
-5.0
5.0
46
-16.7
-5.0
5.0
48
-21.1
-5.0
5.0
48
-21.1
-5.0
5.0
50
-25.8
-5.0
5.0
50
-25.8
-5.0
5.0