Installation Mechanical
24
RTAF-SVX001A-EN
Low Evaporator Refrigerant Cutout and Glycol Requirements
The table below shows the low evaporator temperature
cutout for different glycol levels. Additional glycol beyond
what is required for freeze protection will adversely effect
unit performance.The unit efficiency will be reduced and
the saturated evaporator temperature will be reduced. For
some operating conditions this effect can be significant.
Always us the applied actual percent glycol to establish the
low refrigerant cutout and low water temperature cutout
setpoints.
Note:
Table below should not be interpreted as
suggesting operating ability or performance
characteristics at all tabulated glycol percentages.
Full unit simulation is required for proper
prediction of unit performance for specific
operating conditions. For information on specific
conditions, contact Trane product support.
Table 10.
Low evaporator refrigerant temperature cutout (LERTC) and low water temperature cutout (LWTC)
Ethylene Glycol
Propylene Glycol
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
28.6
35.0
2
31.0
27.6
34.0
2
31.0
27.6
34.0
4
29.7
26.3
32.7
4
29.9
26.5
32.9
5
29.0
25.6
32.0
5
29.3
25.9
32.3
6
28.3
24.9
31.3
6
28.7
25.3
31.7
8
26.9
23.5
29.9
8
27.6
24.2
30.6
10
25.5
22.1
28.5
10
26.4
23.0
29.4
12
23.9
20.5
26.9
12
25.1
21.7
28.1
14
22.3
18.9
25.3
14
23.8
20.4
26.8
15
21.5
18.1
24.5
15
23.1
19.7
26.1
16
20.6
17.2
23.6
16
22.4
19.0
25.4
18
18.7
15.3
21.7
18
20.9
17.5
23.9
20
16.8
13.4
19.8
20
19.3
15.9
22.3
22
14.7
11.3
17.7
22
17.6
14.2
20.6
24
12.5
9.1
15.5
24
15.7
12.3
18.7
25
11.4
8.0
14.4
25
14.8
11.4
17.8
26
10.2
6.8
13.2
26
13.8
10.4
16.8
28
7.7
4.3
10.7
28
11.6
8.2
14.6
30
5.1
1.7
8.1
30
9.3
5.9
12.3
32
2.3
-1.1
5.3
32
6.8
3.4
9.8
34
-0.7
-4.1
5.0
34
4.1
0.7
7.1
35
-2.3
-5.0
5.0
35
2.7
-0.7
5.7
36
-3.9
-5.0
5.0
36
1.3
-2.1
5.0
38
-7.3
-5.0
5.0
38
-1.8
-5.0
5.0
40
-10.8
-5.0
5.0
40
-5.2
-5.0
5.0
42
-14.6
-5.0
5.0
42
-8.8
-5.0
5.0
44
-18.6
-5.0
5.0
44
-12.6
-5.0
5.0
45
-20.7
-5.0
5.0
45
-14.6
-5.0
5.0
46
-22.9
-5.0
5.0
46
-16.7
-5.0
5.0
48
-27.3
-5.0
5.0
48
-21.1
-5.0
5.0
50
-32.1
-5.0
5.0
50
-25.8
-5.0
5.0
