Trane ECOWISE RTAF SE Installation Operation & Maintenance page 103

Table 38 – Recommended Low Evaporator Refrigerant Cutout (LRTC) and % Glycol for RTAF chillers size 245 to 450
Sound power levels
Glycol Solution
Percentage Freeze
Discharge
(weight %) Point (°C)
Measurement conditions:
0
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
2
long) fixed to its discharge opening.
4
Fan
5
Unit speed
1
6
FWD 08 2
3
8
1
10
FWD 10 2
3
12
1
FWD 12 2
14
3
1
15
FWD 14 2
16
3
1
18
FWD 20 2
3
20
22
Intake
24 -10.8
Measurement conditions:
25 -11.4
Measurements taken at the horizontal air intake.
26 -12.1
Fan
28 -13.5
Unit speed
30 -15.0
1
FWD 08 2
32 -16.5
3
1
34 -18.2
FWD 10 2
3
35 -19.0
1
36 -19.9
FWD 12 2
3
38 -21.8
1
FWD 14 2
40 -23.8
3
42 -25.9
1
FWD 20 2
44 -28.1
3
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.
RLC-SVX19E-GB UNT-PRC002-GB
Ethylene Glycol
Minimum
Recommended
LRTC
(°C)
0.0 0.0
-0.6 -1.4
-1.3 -2.1
Power level in dB(A), per Hz frequency band
-1.7 -2.5
125 250
55 50
-2.0 -2.9
57 54
58 57
-2.8 -3.6
57 51
-3.6 -4.5
58 54
60 58
-4.5 -5.3
57 51
58 54
-5.4 -6.2
60 58
56 62
-5.9 -6.7
61 66
-6.3 -7.2
63 69
57 63
-7.4 -8.2
61 66
63 69
-8.4 -9.3
-9.6 -10.4
-11.6
-12.3
-12.9
Power level in dB(A), per Hz frequency band
-14.3
125 250
-15.8
56 55
63 62
-17.3
66 65
62 58
-19.0
66 63
70 67
-19.9
62 58
-20.6
66 63
70 67
-20.6
66 65
73 72
-20.6
78 76
-20.6
68 72
76 76
-20.6
78 79
-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
500 1000 2000
42 37 37
0.7 -1.8
47 40 30
50 42 32
0.0 -2.5
45 42 34
-0.8 -3.1
48 45 38
50 48 40
-1.7 -3.8
45 42 34
48 45 38
-2.6 -4.6
50 48 40
50 48 39
-3.1 -5.0
55 53 47
-3.6 -5.4
58 56 50
51 49 40
-4.6 -6.2
55 53 47
58 56 50
-5.7 -7.1
-6.8 -8.0
-8.0 -9.0
-8.7 -9.6
-9.3 -10.1
-10.7 -11.3
500 1000 2000
-12.2 -12.6
55 53 46
60 60 53
-13.7 -14.0
63 62 56
55 58 51
-15.0 -15.5
60 62 56
63 65 59
-15.0 -16.3
55 58 51
-15.0 -17.1
60 62 56
63 65 59
-15.0 -18.8
65 65 57
69 71 64
-15.0 -20.7
73 75 69
-15.0 -22.6
64 64 56
68 71 65
-15.0 -24.8
71 74 69
-15.0 -25.9
-15.0 -27.1
-15.0 -29.5
-15.0 -32.1
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
fluctuation of brine flow versus Order Write Up
value, as a reduction of flow will adversely affect unit
performance and behaviour.
Evaporator Waterside
Mono Propylene Glycol
Minimum Minimum
Recommended Recommended
LRTC LWTC
(°C) (°C)
0.0
-1.4
-2.0
Overall power
-2.3
4000 8000
31 30
-2.6
38 40
40 43
-3.3
33 28
-4.0 -0.4
39 35
42 39
-4.7 -1.1
33 28
39 35
-5.4 -1.8
42 39
38 36
-5.8 -2.2
46 45
-6.2 -2.6
50 49
39 37
-7.0 -3.4
46 45
50 49
-7.9 -4.3
-8.8 -5.2
-9.9 -6.3
-10.4 -6.8
-11.0 -7.4
Overall power
-12.2 -8.5
4000 8000
-13.4 -9.8
45 42
53 53
-14.8 -11.2
55 57
48 44
-16.3 -12.7
55 52
59 57
-17.1 -13.5
48 44
-17.9 -14.3
55 52
59 57
-19.6 -15.0
50 46
59 57
-20.6 -15.0
64 63
-20.6 -15.0
52 50
61 61
-20.6 -15.0
66 66
-20.6 -15.0
-20.6 -15.0
-20.6 -15.0
-20.6 -15.0
2.8
2.2
1.6
1.3
dB(A)
46
1.0
50
53
0.3
48
51
54
48
51
54
56
60
63
57
60
63
dB(A)
57
64
67
61
66
69
61
66
69
68
74
78
69
75
78
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