RLC-SVX19A-E4
34
Evaporator Waterside
Table 12 – Recommended Low Evaporator Refrigerant Cutout (LRTC) and % Glycol for RTAF chillers
CAUTION!
1. Additional glycol beyond the recommendations will
adversely affect unit performance. The unit effi ciency
will be reduced and the saturated evaporator
temperature will be reduced. For some operating
conditions this effect can be signifi cant.
2. If additional glycol is used, then use the actual %
glycol to establish the low refrigerant cutout set point.
3. The minimum low refrigerant cutout set point allowed
is - 20.6°C.This minimum is established by the
solubility limits of the oil in the refrigerant.
Ethylene Glycol Mono Propylene Glycol
Glycol
Percentage
(%)
Solution
Freeze
Point (°C)
Low
refrigerant
temperature
Cutout LRTC
(°C)
Minimum
Recommended
LWTC
(°C)
Solution
Freeze
Point (°C)
Low
refrigerant
temperature
Cutout LRTC
(°C)
Minimum
Recommended
LWTC (°C)
0 0 -1.9 1.7 0 -1.9 1.7
2 -0.6 -2.4 1.1 -0.6 -2.4 1.1
4 -1.3 -3.2 0.4 -1.2 -3.1 0.5
5 -1.7 -3.6 0 -1.5 -3.4 0.2
6 -2.1 -3.9 -0.4 -1.8 -3.7 -0.2
8 -2.8 -4.7 -1.2 -2.4 -4.3 -0.8
10 -3.6 -5.5 -1.9 -3.1 -5 -1.4
12 -4.5 -6.4 -2.8 -3.8 -5.7 -2.2
14 -5.4 -7.3 -3.7 -4.6 -6.4 -2.9
15 -5.8 -7.7 -4.2 -4.9 -6.8 -3.3
16 -6.3 -8.2 -4.7 -5.3 -7.2 -3.7
18 -7.4 -9.3 -5.7 -6.2 -8.1 -4.5
20 -8.4 -10.3 -6.8 -7.1 -8.9 -5.4
22 -9.6 -11.5 -7.9 -8 -9.9 -6.3
24 -10.8 -12.7 -9.2 -9.1 -10.9 -7.4
25 -11.4 -13.3 -9.8 -9.6 -11.4 -7.9
26 -12.1 -14 -10.4 -10.1 -12 -8.4
28 -13.5 -15.4 -11.8 -11.3 -13.2 -9.7
30 -14.9 -16.8 -13.3 -12.6 -14.5 -10.9
32 -16.5 -18.4 -14.8 -14 -15.9 -12.3
34 -18.2 -20.1 -15 -15.5 -17.4 -13.8
35 -19.1 -20.6 -15 -16.3 -18.2 -14.6
36 -19.9 -20.6 -15 -17.1 -18.9 -15
38 -21.8 -20.6 -15 -18.8 -20.6 -15
40 -23.8 -20.6 -15 -20.7 -20.6 -15
42 -25.9 -20.6 -15 -22.7 -20.6 -15
44 -28.1 -20.6 -15 -24.8 -20.6 -15
45 -29.3 -20.6 -15 -25.9 -20.6 -15
46 -30.5 -20.6 -15 -27.1 -20.6 -15
48 -32.9 -20.6 -15 -29.5 -20.6 -15
50 -35.6 -20.6 -15 -32.1 -20.6 -15
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