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Maintenance
Pressure/Temperature Chart
Routine Maintenance
Lubrication
Improper servicing of the lubrication system, including the addition of excessive or
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 21 on page 41. 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.
46
HFC-134a Temperature Pressure Chart
°F
PSIG
°F
6
9.7
46
8
10.8
48
10
12.0
50
12
13.2
52
14
14.4
54
16
15.7
56
18
17.1
58
20
18.4
60
22
19.9
62
24
21.3
64
26
22.9
66
28
24.5
68
30
26.1
70
32
27.8
72
34
29.5
74
36
31.3
76
38
33.1
78
40
35.0
80
42
37.0
82
44
39.0
84
incorrect oil, substitute quality oil filter, or any mishandling can damage the
PSIG
°F
41.1
86
43.2
88
45.4
90
47.7
92
50.0
94
52.4
96
54.9
98
57.4
100
60.0
102
62.7
104
65.4
106
68.2
108
71.1
110
74.0
112
77.1
114
80.2
116
83.4
118
86.7
120
90.0
122
93.5
124
CAUTION
Centrifugal Chillers
PSIG
°F
PSIG
97.0
126
187.3
100.6
128
192.9
104.3
130
198.7
108.1
132
204.5
112.0
134
210.5
115.9
136
216.6
120.0
138
222.8
124.1
140
229.2
128.4
142
235.6
132.7
144
242.2
137.2
146
249.0
141.7
148
255.8
146.3
150
262.8
151.1
152
270.0
155.9
154
277.3
160.9
156
284.7
166.0
158
292.2
171.1
160
299.9
176.4
162
307.8
181.8
164
315.8
D-EIMWC00804-14EN
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