Trane Sintesis RTAF HE series Installation Operation & Maintenance page 149

Table 29 – Recommended Low Evaporator Refrigerant Cutout (LRTC) and % Glycol for RTAF chillers size 090 to 245
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
6
1
FWD 08 2
8
3
1
10
FWD 10 2
12
3
1
14
FWD 12 2
3
15
1
FWD 14 2
16
3
18
1
FWD 20 2
20
3
22
Intake
24 -10.8
25 -11.4
Measurement conditions:
Measurements taken at the horizontal air intake.
26 -12.1
28 -13.5
Fan
Unit speed
30 -14.9
1
32 -16.5
FWD 08 2
3
34 -18.2
1
FWD 10 2
35 -19.1
3
1
36 -19.9
FWD 12 2
38 -21.8
3
1
40 -23.8
FWD 14 2
3
42 -25.9
1
FWD 20 44 2 -28.1
3
45 -29.3
46 -30.5
48 -32.9
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-SVX19G-GB UNT-PRC002-GB
Ethylene Glycol
Low
refrigerant
temperature
Cutout LRTC
(°C)
0 -1.9
-0.6 -2.4
-1.3 -3.2
Power level in dB(A), per Hz frequency band
-1.7 -3.6
125 250
-2.1 -3.9
55 50
57 54
-2.8 -4.7
58 57
57 51
-3.6 -5.5
58 54
-4.5 -6.4
60 58
57 51
-5.4 -7.3
58 54
60 58
-5.8 -7.7
56 62
61 66
-6.3 -8.2
63 69
-7.4 -9.3
57 63
61 66
-8.4 -10.3
63 69
-9.6 -11.5
-12.7
-13.3
-14
-15.4
Power level in dB(A), per Hz frequency band
125 250
-16.8
56 55
-18.4
63 62
66 65
-20.1
62 58
66 63
-20.6
70 67
62 58
-20.6
66 63
-20.6
70 67
66 65
-20.6
73 72
78 76
-20.6
68 72
76 -20.6 76
78 79
-20.6
-20.6
-20.6
-20.6
Minimum
Recommended Solution
LWTC Freeze
(°C) Point (°C)
1.7 0
1.1 -0.6
0.4 -1.2
0 -1.5
500 1000 2000
-0.4 -1.8
42 37 37
47 40 30
-1.2 -2.4
50 42 32
45 42 34
-1.9 -3.1
48 45 38
-2.8 -3.8
50 48 40
45 42 34
-3.7 -4.6
48 45 38
50 48 40
-4.2 -4.9
50 48 39
55 53 47
-4.7 -5.3
58 56 50
-5.7 -6.2
51 49 40
55 53 47
-6.8 -7.1
58 56 50
-7.9 -8
-9.2 -9.1
-9.8 -9.6
-10.4 -10.1
-11.8 -11.3
500 1000 2000
-13.3 -12.6
55 53 46
-14.8 -14
60 60 53
63 62 56
-15 -15.5
55 58 51
60 62 56
-15 -16.3
63 65 59
55 58 51
-15 -17.1
60 62 56
-15 -18.8
63 65 59
65 65 57
-15 -20.7
69 71 64
73 75 69
-15 -22.7
64 64 56
68 -15 71 -24.8 65
71 74 69
-15 -25.9
-15 -27.1
-15 -29.5
-15 -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
Low
refrigerant
temperature Minimum
Cutout LRTC Recommended
(°C) LWTC (°C)
-1.9
-2.4
-3.1
Overall power
-3.4
4000 8000
-3.7 -0.2
31 30
38 40
-4.3 -0.8
40 43
33 28
-5 -1.4
39 35
-5.7 -2.2
42 39
33 28
-6.4 -2.9
39 35
42 39
-6.8 -3.3
38 36
46 45
-7.2 -3.7
50 49
-8.1 -4.5
39 37
46 45
-8.9 -5.4
50 49
-9.9 -6.3
-10.9 -7.4
-11.4 -7.9
-12 -8.4
-13.2 -9.7
Overall power
4000 8000
-14.5 -10.9
45 42
-15.9 -12.3
53 53
55 57
-17.4 -13.8
48 44
55 52
-18.2 -14.6
59 57
48 44
-18.9
55 52
-20.6
59 57
50 46
-20.6
59 57
64 63
-20.6
52 50
61 -20.6 61
66 66
-20.6
-20.6
-20.6
-20.6
1.7
1.1
0.5
0.2
dB(A)
46
50
53
48
51
54
48
51
54
56
60
63
57
60
63
dB(A)
57
64
67
61
66
69
61
-15
66
-15
69
68
-15
74
78
-15
69
-15 75
78
-15
-15
-15
-15
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