46 Centrifugal Chillers D-EIMWC00804-14EN
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 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.
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