Trane City RTSF050 Installation Operation & Maintenance 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
Sound power levels
Discharge
Glycol Solution
Measurement conditions:
Percentage Freeze
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
(weight %) Point (°C)
long) fixed to its discharge opening.
0
Fan
2
Unit speed
1
4
FWD 08 2
3
5
1
FWD 10 2
6
3
8
1
FWD 12 2
10
3
1
12
FWD 14 2
14 3
1
15
FWD 20 2
3
16
18
Intake
20
Measurement conditions:
22
Measurements taken at the horizontal air intake.
24 -10.8
Fan
25 -11.4
Unit speed
26 1 -12.1
FWD 08 2
28 -13.5
3
1
30 -15.0
FWD 10 2
3
32 -16.5
1
34 -18.2
FWD 12 2
3
35 -19.0
1
FWD 14 2
36 -19.9
3
1
38 -21.8
FWD 20 2
40 -23.8
3
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 efficiency will be reduced and the
saturated evaporator temperature will be reduced. For some operating
conditions this effect can be significant.
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.
UNT-PRC002-GB
RLC-SVX023A
Ethylene Glycol
Minimum
Recommended
LRTC
(°C)
0.0 0.0
Power level in dB(A), per Hz frequency band
-0.6 -1.4
125 250
55 50
-1.3 -2.1
57 54
58 57
-1.7 -2.5
57 51
58 54
-2.0 -2.9
60 58
-2.8 -3.6
57 51
58 54
-3.6 -4.5
60 58
56 62
-4.5 -5.3
61 66
-5.4 63 -6.2 69
57 63
-5.9 -6.7
61 66
63 69
-6.3 -7.2
-7.4 -8.2
-8.4 -9.3
-9.6 -10.4
-11.6
Power level in dB(A), per Hz frequency band
-12.3
125 250
56 -12.9 55
63 62
-14.3
66 65
62 58
-15.8
66 63
70 67
-17.3
62 58
-19.0
66 63
70 67
-19.9
66 65
73 72
-20.6
78 76
68 72
-20.6
76 76
-20.6
78 79
-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
500 1000 2000
42 37 37
1.5 -1.2
47 40 30
50 42 32
1.1 -1.5
45 42 34
48 45 38
0.7 -1.8
50 48 40
0.0 -2.5
45 42 34
48 45 38
-0.8 -3.1
50 48 40
50 48 39
-1.7 -3.8
55 53 47
58 -2.6 56 -4.6 50
51 49 40
-3.1 -5.0
55 53 47
58 56 50
-3.6 -5.4
-4.6 -6.2
-5.7 -7.1
-6.8 -8.0
-8.0 -9.0
-8.7 -9.6
500 1000 2000
55 -9.3 53 -10.1 46
60 60 53
-10.7 -11.3
63 62 56
55 58 51
-12.2 -12.6
60 62 56
63 65 59
-13.7 -14.0
55 58 51
-15.0 -15.5
60 62 56
63 65 59
-15.0 -16.3
65 65 57
69 71 64
-15.0 -17.1
73 75 69
64 64 56
-15.0 -18.8
68 71 65
-15.0 -20.7
71 74 69
-15.0 -22.6
-15.0 -24.8
-15.0 -25.9
-15.0 -27.1
-15.0 -29.5
-15.0 -32.1
4. With glycol application, ensure that there is no fluctuation of brine
flow versus Order Write Up value, as a reduction of flow 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 specific operating conditions. For information on
specific conditions, contact Trane.
Installation - Mechanical
Mono Propylene Glycol
Minimum Minimum
Recommended Recommended
LRTC
(°C)
0.0
-1.4
4000 8000
31 30
-2.0
38 40
40 43
-2.3
33 28
39 35
-2.6
42 39
-3.3
33 28
39 35
-4.0
42 39
38 36
-4.7
46 45
50 -5.4 49
39 37
-5.8
46 45
50 49
-6.2
-7.0
-7.9
-8.8
-9.9
-10.4
4000 8000
45 -11.0 42
53 53
-12.2
55 57
48 44
-13.4
55 52
59 57
-14.8
48 44
-16.3
55 52
59 57
-17.1
50 46
59 57
-17.9
64 63
52 50
-19.6
61 61
-20.6
66 66
-20.6
-20.6
-20.6
-20.6
-20.6
-20.6
LWTC
(°C)
2.8
Overall power
2.2
dB(A)
46
1.6
50
53
1.3
48
51
1.0
54
0.3
48
51
-0.4
54
56
-1.1
60
-1.8 63
57
-2.2
60
63
-2.6
-3.4
-4.3
-5.2
-6.3
Overall power
-6.8
dB(A)
-7.4 57
64
-8.5
67
61
-9.8
66
69
-11.2
61
-12.7
66
69
-13.5
68
74
-14.3
78
69
-15.0
75
-15.0
78
-15.0
-15.0
-15.0
-15.0
-15.0
-15.0
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