57
Check Compressor Oil Level — After adjusting the
refrigerant charge, allow each circuit to run fully loaded for
20 minutes. Stop the compressors and check the oil level. Oil
level should be
1
/
8
to
3
/
8
up on the sight glass.
Add oil only if necessary to bring the oil into view in the
sight glass. If oil is added, run the circuit for an additional
10 minutes, then stop and check oil level. If the level remains
low, check the piping system for proper design for oil return;
also, check the system for leaks. If checking the oil level with
unit running in part load, let unit run one hour, then run at full
load for 10 minutes. If oil does not return to acceptable sight
glass levels, check for correct suction piping and line sizing.
Adjust Oil Charge — Although the compressors are
factory charged with oil, additional oil is likely required to
maintain the oil level in the compressor. Tables 12-15 indicate
the likely amount required based on the liquid line size and
system piping length. Additional lubricant estimate is based on
using recommended pipe sizes. Values listed are estimates
only. See Adding Oil section on page 147 for Carrier-approved
oils. After operating the compressor for a period of time, the
oil level should be between
1
/
8
and
3
/
8
of the oil sight glass.
The compressor oil level should be checked with the compres-
sor off to avoid the sump turbulence when the compressor is
running. Oil must be added if the oil level does not meet the
requirements.
Table 12 — 38AP 60 Hz Additional Lubricant (English)
IMPORTANT: Oil level should only be checked when the
compressors are off.
UNIT SIZE CIRCUIT
ADDITIONAL LUBRICANT (FLUID OUNCES) ESTIMATE FOR PIPING LENGTH AND REFRIGERANT
UP to 25 ft 25 to 50 ft 50 to 75 ft 75 to 100 ft 100 to 125 ft 125 to 150 ft 150 to 175 ft 175 to 200 ft
38APD025
A000788 910
B000788 910
38APS025 Single 10 12 17 19 22 24 26 29
38APD027
A006789 910
B006789 910
38APS027 Single 11 16 18 20 23 25 27 29
38APD030
A 0 0 7 7 8 9 16 17
B 0 0 7 7 8 9 16 17
38APS030 Single 12 17 19 21 24 26 28 44
38APD040
A 9 11 12 18 20 23 25 27
B0910121921 2326
38APS040 Single 23 30 33 37 40 57 63 69
38APD050
A 9 11 16 19 21 23 25 28
B111618 20 23 25 27 29
38APS050 Single 29 35 39 51 57 63 68 74
38APD060
A111618 21 23 25 28 30
B121719 21 24 26 28 44
38APS065 Single 33 44 50 56 61 67 73 102
38APD070
A121719 21 24 26 28 44
B202630 33 36 40 59 65
38APD080
A121719 21 24 26 28 44
B283438 50 56 62 67 73
38APD090
A233033 37 40 57 63 69
B283438 50 56 62 67 73
38APD100
A293539 51 57 63 68 74
B283438 50 56 62 67 73
38APD115
A283438 50 56 62 67 73
B 33 44 50 56 61 67 73 102
38APD130
A283438 50 56 62 67 73
B 43 54 60 65 71 94 103 112
To Next Page
Loading...
