39
By following these evacuation and dehydration procedures,
the amount of moisture present in the system will be
minimized. It is required that liquid line filter driers be installed
between the condenser(s) and the expansion devices to capture
any foreign debris and provide additional moisture removal
capacity.
LIQUID CHARGING METHOD
For 30MP015-045: Add charge to the unit through the liquid
line service valve. Never charge liquid into the low-pressure
side of the system.
For 30MP050-071: Add the charge to the unit through the high
flow Schrader valve on the filter drier.
1. Close liquid line ball valve (30MPA only).
2. Connect a refrigerant cylinder loosely to the high flow
Schrader valve connection on the liquid line. Purge the
charging hose and tighten the connections.
3. Open the refrigerant cylinder valve.
4. If the system has been dehydrated and is under vacuum,
break the vacuum with refrigerant gas. For R-410A, build
up system pressure to 101 psig and 32 F (697 kPa and
0° C). Invert the refrigerant cylinder so that the liquid re-
frigerant will be charged.
5. a. For complete charge of 30MPW units, follow
charging by weight procedure. When charge is
nearly full, complete the process by observing the
sight glass for clear liquid flow while the unit is
operating. The use of sight glass charging is valid
only when unit is operating at full capacity.
b. For complete charge of 30MPA units or where
refrigerant cylinder cannot be weighed, follow the
condenser manufacturer’s charging procedure or
follow charging by sight glass procedure. The use
of sight glass charging is valid only when unit is
operating at full capacity.
6. a. The 30MPA condenserless units are shipped
with a nitrogen holding charge. After installation
with the field-supplied system high side, the com-
plete system should be evacuated and charged per
the condenser manufacturer’s charging procedure
or charged until the sight glass is clear (with the
unit running at full capacity). To achieve maxi-
mum system capacity, add additional charge equal
to the difference between the condenser optimal
charge and the condenser minimum charge, which
can be obtained from the charge data provided in
the condenser installation instructions.
b. To ensure maximum performance of 30MPW
units, raise the compressor saturated discharge
temperature (SDT) to approximately 100 F
(37.8 C) by throttling the condenser water intake.
Add charge until there is approximately 9 to 12° F
(5.0 to 6.6° C) of system subcooling (SDT minus
actual temperature entering the expansion valve).
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 37 and 38 indi-
cate 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 esti-
mates only. See Add Oil section 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 compressor
off to avoid the sump turbulence when the compressor is run-
ning. Oil must be added if the oil level does not meet the
requirements.
Table 37 — 60 Hz Additional Lubricant (English)
Table 38 — 60 Hz Additional Lubricant (SI)
IMPORTANT: Oil level should only be checked when the
compressors are off.
UNIT SIZE
CONDENSER
09DP
ADDITIONAL LUBRICANT (FLUID OUNCES) REQUIRED FOR PIPING 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
30MPA015 S018 0 9 11 12 13 14 15 16
30MPA020 S020 11 12 13 14 21 23 26 28
30MPA030 S030 13 15 17 20 22 24 27 29
30MPA040 M040 27 30 33 36 51 57 63 68
30MPA045 M050
27
30 33 37 52 57 63 69
30MPA050 M050
27
30 34 38 53 59 65 71
30MPA055 M055
27
31 35 39 53 59 65 71
30MPA060 M060
28
32 36 40 54 60 66 72
30MPA065 M065
33
37 41 45 59 65 71 77
30MPA071 M075
39
43 47 51 65 71 77 83
UNIT SIZE
CONDENSER
09DP
ADDITIONAL LUBRICANT (ML) REQUIRED FOR PIPING AND REFRIGERANT
Up to 7.5 m 7.5 to 15 m 15 to 22.5 m 22.5 to 30 m 30 to 37.5 m 37.5 to 45 m 45 to 52.5 m 52.5 to 60 m
30MPA015 S018 0 262 319 352 384 417 450 482
30MPA020 S020 315 347 380 413 620 688 756 823
30MPA030 S030 372 440 508 575 643 710 778 846
30MPA040 M040 784 881 977 1074 1511 1676 1841 2005
30MPA045 M050
791
888 984 1081 1518 1683 1848 2012
30MPA050 M050
783
898 1014 1129 1546 1722 1897 2073
30MPA055 M055
795
911 1026 1141 1558 1734 1910 2085
30MPA060 M060
825
941 1056 1171 1588 1764 1939 2115
30MPA065 M065
976
1091 1206 1322 1739 1914 2090 2266
30MPA071 M075
1147
1263 1378 1493 1910 2086 2261 2437
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