Table of Contents
Advertisement
Low side Charge-isolation Procedure
After normal shutdown, most of the charge resides in the
evaporator. Running cold water through the evaporator
may also drive much of the refrigerant to the evaporator.
Sound power levels
1.
Make sure the circuit is off.
Discharge
2.
Close the suction-line isolation valve.
3.
Close the liquid line service valve.
Measurement conditions:
4.
Close the liquid line service valve
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
5.
Manually open the EXV
long) fixed to its discharge opening.
6.
Use a liquid pump or vacuum pump to move
refrigerant from the condenser to the evaporator.
Fan
The liquid pump will only be effective if there is a lot
Unit
speed
of charge in the condenser. It may be connected to
1
the condenser drain port on the liquid-line isolation
FWD 08
2
valve.
3
1
FWD 10
2
Note: If a pump is to be used, connect it before closing
3
this valve. This port is only isolated when the valve is back
1
FWD 12
2
seated. If a vacuum pump is used, then connect it to the
3
discharge-line service valve near to the oil separator.
1
A vacuum pump will be required for part of the
FWD 14
2
procedure.
3
1
FWD 20
2
The evaporator is large enough to hold all the charge, for
3
any unit, below the centerline of the shell. Therefore, no
special precautions are required to restart the unit after
Intake
isolating the charge in the evaporator.
Measurement conditions:
Refrigerant Filter Replacement –
Measurements taken at the horizontal air intake.
Changing Procedures
Fan
Unit
speed
A dirty filter is indicated by a temperature gradient
1
across the filter, corresponding to a pressure drop. If the
FWD 08
2
temperature downstream of the filter is 4,4°C lower than
3
1
the upstream temperature, the filter should be replaced.
FWD 10
2
A temperature drop can also indicate that the unit is
3
undercharged.
1
FWD 12
2
3
1.
With the unit off, verify that the EXV is closed.
1
Close the liquid-line isolation valve.
FWD 14
2
2.
Attach the vacuum hose to the service port o the
3
1
liquid-line filter flange.
FWD 20
2
3.
Evacuate the refrigerant from the liquid-line and
3
store.
4.
Remove the vacuum hose.
5.
Depress the Schrader valve to equalize pressure in
the liquid line with atmospheric pressure.
6.
Remove the bolts that retain the filter flange.
7.
Remove the old filter element.
8.
Inspect the replacement filter element and lubricate
the o-ring with Trane OIL00048E for RTAF SE, HE and
XE and with Trane OIL00317 for RTAF HSE and HSS.
9.
Install the new filter element in the filter housing.
10. Inspect the flange gasket and replace it with a new
one if damaged.
11. Install the flange and torque the bolts to 19-22 Nm
(14-16 lb-ft).
12. Attach the vacuum hose and vacuum the liquid line.
RLC-SVX19E-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
Periodic Maintenance
13. Remove the vacuum hose from the liquid and attach
the charging hose.
14. Replace the stored charge in the liquid line.
15. Remove the charging hose.
16. Open the liquid-line isolation valve.
Lubrication System
The lubrication system has been designed to keep most
of the oil lines filled with oil as long as there is a proper
oil level in the oil sump.
The total oil charge can be removed by draining the
oil system, the oil return line from the evaporator, the
evaporator, and the compressor. Very small quantities of
1000
2000
oil may be found in other components.
37
37
Proper charging of the oil system is critical to the
40
30
reliability of the compressor and chiller. Too little oil
42
32
can cause the compressor to run hot and inefficiently.
42
34
45
38
When taken to an extreme, low oil level may result
48
40
in instant failure of the compressor. Too much oil will
42
34
result in high oil-circulation rates, which will foul the
45
38
condenser and evaporator performances. This will result
48
40
48
39
in inefficient operation of the chiller. Taken to an extreme,
53
47
high oil levels may result in erratic expansion-valve
56
50
control or shut down of the chiller due to evaporator
49
40
53
47
low evaporator refrigerant temperature. Too much oil
56
50
may contribute to long term bearing wear. Additionally,
excessive compressor wear is probable when the
compressor is started with the oil lines dry.
• Oil system consists of the following components:
• Compressor
• Oil separator
1000
2000
• Discharge line with service valve
53
46
60
53
• Oil line from separator to compressor
62
56
• Oil line drain (lowest point of the system)
58
51
62
56
• Oil cooler (with HA & Low temperature brine option)
65
59
58
51
• Oil temperature sensor
62
56
• Oil line shutoff valve with flare service connection
65
59
65
57
• Oil filter (internal to compressor) with flare-fitting
71
64
service connection and Schrader valve
75
69
64
56
• Oil flow-control valve (internal to the compressor after
71
65
the filter)
74
69
• Oil return line from evaporator with shutoff valve,
oil filter, and solenoid control valve (for the manifold
compressor circuits only)
Oil charging data.
The oil quantity is written on the nameplate of the unit.
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
117
Advertisement
Table of Contents
