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Refrigerant Circuit
Each unit has two refrigerant circuits, with one or
two rotary screw per circuit. Each refrigerant circuit
includes a compressor suction and discharge service
Sound power levels
valve, liquid line shutoff valve, removable core filter,
liquid line sight glass with moisture indicator, charging
Discharge
port and electronic expansion valve. Fully modulating
compressors and electronic expansion valve provide
Measurement conditions:
variable capacity modulation over the entire operating
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
range.
long) fixed to its discharge opening.
Refrigerant Cycle
Fan
Typical refrigerant cycle on the RTAF is represented on
Unit
speed
1
the pressure enthalpy diagram shown in the figure below.
FWD 08
2
Key state points are indicated on the figure. The cycle for
3
the full load design point is represented in the plot.
1
FWD 10
2
3
Figure 41 – Pressure enthalpy (P-h) diagram
1
FWD 12
2
3
1
FWD 14
2
3
1
FWD 20
2
3b
3
Intake
Measurement conditions:
Measurements taken at the horizontal air intake.
4
Fan
Unit
speed
1
FWD 08
2
3
1
The RTAF chiller uses a shell and tube evaporator design
FWD 10
2
with refrigerant evaporating on the shell side and water
3
1
flowing inside tubes having enhanced surfaces (states
FWD 12
2
4 to 1). The suction lines are designed to minimize
3
pressure drop (states 1 to 1b) the compressor is a twin-
1
FWD 14
2
rotor helical rotary compressor designed similarly to the
3
compressors offered in other Trane screw compressor
1
based chiller (states 1b to 2). The discharge lines include a
FWD 20
2
highly efficient oil separation system that removes 99,8%
3
of the oil from the refrigerant stream going to the heat
exchangers (states 2 to 2b). De-superheating, condensing
and sub-cooling are accomplished in a microchannel
cooled heat exchanger where refrigerant is condensed
inside the microchannel (states 2b to 3b). Refrigerant
flow through the system is balanced by an electronic
expansion valve (states 3b to 4).
Refrigerant and Oil
RTAF use R134a or R513A, Trane believes that responsible
refrigerant practices are important to the environment,
our customers, and the air conditioning industry. All
technicians who handle refrigerants must be properly
qualified. All local and UE regulations in what handling,
reclaiming, recovering and recycling, must be followed.
R134a/R513A is a medium pressure refrigerant. It may
RLC-SVX19E-GB
UNT-PRC002-GB
Power level in dB(A), per Hz frequency band
125
250
55
50
57
54
58
57
57
51
58
54
60
58
57
51
58
54
R134a/R513A
60
58
56
62
61
66
63
69
57
63
61
66
3
63
69
1
1b
Power level in dB(A), per Hz frequency band
125
250
56
55
63
62
KJ/kg
66
65
62
58
66
63
70
67
62
58
66
63
70
67
66
65
73
72
78
76
68
72
76
76
78
79
not be used in any condition that would cause the chiller
to operate in vacuum without a purge system. RTAF
is not equipped with a purge system. Therefore RTAF
must not be operated in a condition that would result
in a saturated condition in the chiller of -26°C or lower.
R134a/R513A requires the use of specific POE oils as
designated on the unit nameplate. Use only R134a, Trane
Oil 00048E in RTAF SE HE and XE chillers and Trane OIL
00317 in RTAF HSE/HSS chillers.
Compressor and Lube Oil System
The rotary screw compressor is semi-hermetic, direct
drive with capacity control via a slide valve on SE, HE
500
and XE versions and combined action of slide valve and
1000
2000
42
37
37
variable frequency driver on the HSE/HSS version.
47
40
30
The motor is a suction gas cooled hermetically sealed,
50
42
32
induction squirrel cage motor. Oil separator is provided
45
42
34
48
45
38
separately from the compressor. Check valve in the
50
48
40
compressor discharge and lube oil system are also
45
42
34
provided.
48
45
38
50
48
40
50
Condenser and Fans
48
39
55
53
47
58
56
50
The air cooled Microchannel condenser coils use all
51
49
40
2
aluminum brazed fin construction.
55
53
47
2b
The coil is composed of three components: the flat
58
56
50
microchannel tube, the fins located between the
microchannel tubes, and two refrigerant manifolds. Coils
can be cleaned with high pressure water (see Condenser
Coils MCHE maintenance for instructions).
The condenser coil has an integral subcooling circuit. The
maximum allowable working pressure of the condenser
is 25.0 bars. Condensers are factory proof and leak
500
1000
2000
tested at 45 bars.
55
53
46
Direct-drive vertical-discharge airfoil condenser fans are
60
60
53
63
dynamically balanced.
62
56
55
58
51
60
62
56
Evaporator
63
65
59
55
58
51
The evaporator is a shell and tube heat exchanger design
60
62
56
constructed from carbon steel shells and tube sheets
63
65
59
65
65
57
with internally and externally finned seamless copper
69
71
64
tubes mechanically expanded into the tube sheets. Tubes
73
75
69
are cleanable with dismountable water boxes. Tubes
64
64
56
68
71
65
diameter exterior is 19mm. Each tube is individually
71
74
69
replaceable.
The evaporator is designed, tested and stamped in
accordance with PED 97/23/EC or 2014/68/EU Pressure
regulation for a refrigerant side working pressure of
14 bars. Standard water connections are grooved for
Victaulic style pipe couplings. Water boxes are available
in 1 or 2 passes configurations according to unit size and
include an air vent, a drain and fittings for temperature
control sensors. Evaporator is insulated with closed cell
insulation.
Operating Principles
Overall power
4000
8000
dB(A)
31
30
46
38
40
50
40
43
53
33
28
48
39
35
51
42
39
54
33
28
48
39
35
51
42
39
54
38
36
56
46
45
60
50
49
63
39
37
57
46
45
60
50
49
63
Overall power
4000
8000
dB(A)
45
42
57
53
53
64
55
57
67
48
44
61
55
52
66
59
57
69
48
44
61
55
52
66
59
57
69
50
46
68
59
57
74
64
63
78
52
50
69
61
61
75
66
66
78
11
109
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