Trane CITY RTSF Series Manual page 17

RTSF Low Refrigerant temperature Ethylene Glycol and Propylene Glycol and Freeze protection settings.
Table 3 – Recommended low evaporator refrigerant temperature cutout (LERTC) and low water temperature cutout
(LWTC) for RTSF chillers
Glycol Solution
Percentage Freeze
(weight %) Point (°C)
0
2
4
5
6
8
10
12
14
15
16
18
20
22
24 -10.8
25 -11.4
26 -12.1
28 -13.5
30 -15.0
32 -16.5
34 -18.2
35 -19.0
36 -19.9
38 -21.8
40 -23.8
42 -25.9
44 -28.1
45 -29.3
46 -30.5
48 -33.0
50 -35.6
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.
4. With glycol application, ensure that there is no fl uctuation of brine fl ow versus Order Write Up value, as a reduction of fl ow will adversely affect
unit performance and behaviour.
5. Tables above 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 specifi c operating conditions. For information on specifi c
conditions, contact Trane.
RLC-SVX023B-GB
Ethylene Glycol
Minimum
Recommended
LRTC
(°C)
0.0 0.0
-0.6 -1.4
-1.3 -2.1
-1.7 -2.5
-2.0 -2.9
-2.8 -3.6
-3.6 -4.5
-4.5 -5.3
-5.4 -6.2
-5.9 -6.7
-6.3 -7.2
-7.4 -8.2
-8.4 -9.3
-9.6 -10.4
-11.6
-12.3
-12.9
-14.3
-15.8
-17.3
-19.0
-19.9
-20.6
-20.6
-20.6
-20.6
-20.6
-20.6
-20.6
-20.6
-20.6
Minimum
Recommended Solution
LWTC Freeze
(°C) Point (°C)
2.8 0.0
2.2 -0.6
1.5 -1.2
1.1 -1.5
0.7 -1.8
0.0 -2.5
-0.8 -3.1
-1.7 -3.8
-2.6 -4.6
-3.1 -5.0
-3.6 -5.4
-4.6 -6.2
-5.7 -7.1
-6.8 -8.0
-8.0 -9.0
-8.7 -9.6
-9.3 -10.1
-10.7 -11.3
-12.2 -12.6
-13.7 -14.0
-15.0 -15.5
-15.0 -16.3
-15.0 -17.1
-15.0 -18.8
-15.0 -20.7
-15.0 -22.6
-15.0 -24.8
-15.0 -25.9
-15.0 -27.1
-15.0 -29.5
-15.0 -32.1
Installation - Mechanical
Mono Propylene Glycol
Minimum Minimum
Recommended Recommended
LRTC
(°C)
0.0
-1.4
-2.0
-2.3
-2.6
-3.3
-4.0
-4.7
-5.4
-5.8
-6.2
-7.0
-7.9
-8.8
-9.9
-10.4
-11.0
-12.2
-13.4
-14.8
-16.3
-17.1
-17.9
-19.6
-20.6
-20.6
-20.6
-20.6
-20.6
-20.6
-20.6
LWTC
(°C)
2.8
2.2
1.6
1.3
1.0
0.3
-0.4
-1.1
-1.8
-2.2
-2.6
-3.4
-4.3
-5.2
-6.3
-6.8
-7.4
-8.5
-9.8
-11.2
-12.7
-13.5
-14.3
-15.0
-15.0
-15.0
-15.0
-15.0
-15.0
-15.0
-15.0
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