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Compressor and Lube Oil System
The rotary screw compressor is semi-hermetic, direct
drive, with rolling element bearings, differential
refrigerant pressure oil pump and oil heater. The motor
Sound power levels
is a suction gas cooled, hermetically sealed, two-pole
squirrel cage induction motor.
Discharge
Capacity control is done via a slide valve on fixed speed
compressor on SE, HE and XE versions.
Measurement conditions:
An adaptive frequency drive provides capacity control of
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
the lead compressor on each circuit on HSE/HSS version.
long) fixed to its discharge opening.
For maximum efficiency, larger tonnage units utilize both
fixed speed and variable speed compressors staged in
the same circuit.
Fan
Unit
speed
Oil separator is provided separate from the compressor.
1
Oil filtration is provided internal to the compressor.
FWD 08
2
Check valves in the compressor discharge and lube oil
3
1
system are also provided.
FWD 10
2
3
Condenser and Fans
1
FWD 12
2
The air cooled Microchannel condenser coils use all
3
1
aluminum brazed fin construction.
FWD 14
2
The coil is composed of three components: the flat
3
microchannel tube, the fins located between the
1
microchannel tubes, and two refrigerant manifolds. Coils
FWD 20
2
3
can be cleaned with high pressure water (see Condenser
Coils MCHE maintenance for instructions).
Intake
The condenser coil has an integral subcooling circuit.
The maximum allowable working pressure of the
Measurement conditions:
condenser is 25.0 bars. Condensers are factory proof and
Measurements taken at the horizontal air intake.
leak tested at 45 bars.
Direct-drive vertical-discharge airfoil condenser fans are
Fan
dynamically balanced.
Unit
speed
1
Evaporator
FWD 08
2
3
1
The evaporator is a shell and tube heat exchanger design
FWD 10
2
constructed from carbon steel shells and tube sheets
3
with internally and externally finned seamless copper
1
tubes mechanically expanded into the tube sheets. Tubes
FWD 12
2
3
are cleanable with dismountable water boxes. Tubes
1
diameter exterior is 19mm. Each tube is individually
FWD 14
2
replaceable.
3
1
The evaporator is designed, tested and stamped in
FWD 20
2
accordance with PED 97/23/EC or 2014/68/EU Pressure
3
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.
RLC-SVX19G-GB
UNT-PRC002-GB
Power level in dB(A), per Hz frequency band
125
250
500
55
50
42
57
54
47
58
57
50
57
51
45
58
54
48
60
58
50
57
51
45
58
54
48
60
58
50
56
62
50
61
66
55
63
69
58
57
63
51
61
66
55
63
69
58
Power level in dB(A), per Hz frequency band
125
250
500
56
55
55
63
62
60
66
65
63
62
58
55
66
63
60
70
67
63
62
58
55
66
63
60
70
67
63
66
65
65
73
72
69
78
76
73
68
72
64
76
76
68
78
79
71
Operating Principles
1000
2000
4000
37
37
31
40
30
38
42
32
40
42
34
33
45
38
39
48
40
42
42
34
33
45
38
39
48
40
42
48
39
38
53
47
46
56
50
50
49
40
39
53
47
46
56
50
50
1000
2000
4000
53
46
45
60
53
53
62
56
55
58
51
48
62
56
55
65
59
59
58
51
48
62
56
55
65
59
59
65
57
50
71
64
59
75
69
64
64
56
52
71
65
61
74
69
66
Overall power
8000
dB(A)
30
46
40
50
43
53
28
48
35
51
39
54
28
48
35
51
39
54
36
56
45
60
49
63
37
57
45
60
49
63
Overall power
8000
dB(A)
42
57
53
64
57
67
44
61
52
66
57
69
44
61
52
66
57
69
46
68
57
74
63
78
50
69
61
75
66
78
11
157
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