IM 1044-2
Centrifugal Chillers
45
Maintenance
Pressure/Temperature Chart
HFC-134a Temperature Pressure Chart
°F
PSIG
°F
PSIG
°F
PSIG
°F
PSIG
6
9.7
46
41.1
86
97.0
126
187.3
8
10.8
48
43.2
88
100.6
128
192.9
10
12.0
50
45.4
90
104.3
130
198.7
12
13.2
52
47.7
92
108.1
132
204.5
14
14.4
54
50.0
94
112.0
134
210.5
16
15.7
56
52.4
96
115.9
136
216.6
18
17.1
58
54.9
98
120.0
138
222.8
20
18.4
60
57.4
100
124.1
140
229.2
22
19.9
62
60.0
102
128.4
142
235.6
24
21.3
64
62.7
104
132.7
144
242.2
26
22.9
66
65.4
106
137.2
146
249.0
28
24.5
68
68.2
108
141.7
148
255.8
30
26.1
70
71.1
110
146.3
150
262.8
32
27.8
72
74.0
112
151.1
152
270.0
34
29.5
74
77.1
114
155.9
154
277.3
36
31.3
76
80.2
116
160.9
156
284.7
38
33.1
78
83.4
118
166.0
158
292.2
40
35.0
80
86.7
120
171.1
160
299.9
42
37.0
82
90.0
122
176.4
162
307.8
44
39.0
84
93.5
124
181.8
164
315.8
Routine Maintenance
Lubrication
CAUTION
Improper servicing of the lubrication system, including the addition of excessive or incorrect oil, substitute quality oil filter,
or any mishandling can damage the equipment. Only authorized and trained service personnel should attempt
this service. For qualified assistance, contact your local
Daikin
service location.
After the system is once placed into operation, no other additional oil is required except in the event that repair
work becomes necessary to the oil pump, or unless a large amount of oil is lost from the system due to a leak.
If oil must be added with the system under pressure, use a hand pump with its discharge line connected to the
backseat port of the valve in the lubricant drain from the compressor to the sump. See Figure 26 on page 40. The
POE oils used with R-134a are hygoscopic and care must be exercised to avoid exposure to moisture (air).
The condition of compressor oil can be an indication of the general condition of the refrigerant circuit and
compressor wear. An annual oil check by a qualified laboratory is essential for maintaining a high level of
maintenance. It is useful to have an oil analysis at initial startup to provide a benchmark from which to
compare future tests. The local
Daikin
service office can recommend suitable facilities for performing these
tests.
Table 16 gives the upper limits for metals and moisture in the polyolester lubricants required by
Daikin
chillers.