Trane S Series - Low Evaporator Refrigerant Cutout, Percent Glycol Requirements

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RLC-SVX09Q-EN
Figure 23. Condenser pressure drop curves - RTWD 60 Hz
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
0.0 200.0 400.0 600.0 800.0 1000.0 1200.0
Pressure Drop (ft. H2O)
Water Flow (GPM)
Waterside Pressure Drop - 60 Hz Units - Condenser
RTWD150 High
RTWD160 High
RTWD180 High
RTWD200 High
RTWD220 High
RTWD250 High
RTWD150 Prem
RTWD160 Prem
RTWD180 Prem
RTWD200 Prem
Low Evaporator Refrigerant
Cutout, Percent Glycol
Requirements
The tables below show the low evaporator temperature
cutout for different glycol levels. Additional glycol beyond
the recommendations will adversely affect 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.
If additional glycol is used, then use the actual percent to
establish the low refrigerant cutout setpoint.
Table 14. Low evaporator refrigerant temperature cutout (LRTC) and low water temperature cutout (LWTC) – ethylene
or propylene glycol
Ethylene Glycol Propylene Glycol
Inhibitor
Percentage
(%)
Solution
Freeze Point
(°F)
Minimum
Recommended
LRTC (°F)
Minimum
Recommended
LWTC (°F)
Inhibitor
Percentage
(%)
Solution
Freeze Point
(°F)
Minimum
Recommended
LRTC (°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
Installation - Mechanical