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150
130
ADD CHARGE IF ABOVE CURVE
110
90
70
50
150
200
100
LIQUID PRESSURE AT LIQUID VALVE (PSIG)
Charging with Unit Off and Evacuated — Close liquid
line service valve before charging. Weigh in charge shown
in Table 1. Open liquid line service valve; start unit and
allow it to run several minutes fully loaded. Check for a clear
sight glass. Be sure clear condition is liquid and not vapor.
Complete charging the unit.
Charging with Unit Running — If charge is to be added while
unit is operating, it is necessary to have all condenser fans
and compressors operating. It may be necessary to block con-
denser coils at low-ambient temperatures to raise condens-
ing pressure to approximately 280 psig (1931 kPag) to turn
all condenser fans on. Do not totally block a coil to do this.
Partially block all coils in uniform pattern. Charge vapor into
compressor low-side service port located above oil pump crank-
shaft housing. Charge each circuit until sight glass shows
clear liquid.
Oil Charge (Refer to Table 3) —
tory charged with oil. Acceptable oil level for each compres-
sor is from
3
⁄
to
1
⁄
(on 06E299,
8
8
Fig. 44, page 29).
When additional oil or a complete charge is required, use
only Carrier-approved compressor oil.
Approved oils are:
Petroleum Specialties, Inc. — Cryol 150A (factory oil charge)
Texaco, Inc.
— Capella WF-32-150
Witco Chemical Co.
— Suniso 3GS
Do not reuse drained oil, and do not use any oil that has
been exposed to atmosphere.
ADD OIL — Close suction shutoff valve and pump down
crankcase to 2 psig (14 kPa). (Low-pressure cutout must be
jumped.) Wait a few minutes and repeat until pressure re-
mains steady at 2 psig (14 kPa). Remove oil fill plug above
the oil level sight glass, add oil through plug hole, and re-
place plug. Run compressor for 20 minutes and check oil
level.
150
ADD CHARGE IF ABOVE CURVE
125
100
75
50
100
150
LIQUID PRESSURE AT LIQUID VALVE (PSIG)
ALL OUTDOOR FANS MUST BE OPERATING
Fig. 58 — Charging Chart Unit 48/50MP90P
REMOVE CHARGE IF BELOW CURVE
300
350
400
250
ALL OUTDOOR FANS MUST BE RUNNING
Fig. 59 — Charging Chart — Unit 48/50MP10R
All units are fac-
1
⁄
max) of sight glass (see
8
REMOVE CHARGE IF BELOW CURVE
200
250
300
350
150
125
ADD CHARGE IF ABOVE CURVE
100
75
50
450
100
150
IMPORTANT: For units with 2 compressors per re-
frigeration circuit, both compressors must be running
to adjust the oil level. Two oil level equalizer lines be-
tween compressors distribute the oil to each
compressor.
REMOVE OIL — Pump down compressor to 2 psig
(14 kPag). Loosen the
pressor base and allow the oil to seep out past the threads of
the plug.
NOTE: The crankcase will be slightly pressurized. Do not
remove the plug, or the entire oil charge will be lost.
Small amounts of oil can be removed through the oil pump
discharge connection while the compressor is running.
Moisture/Liquid Indicator —
refrigerant indicates sufficient charge in the system. Bubbles
indicate undercharged system or the presence of non-
condensables. Moisture in the system measured in parts per
million (ppm) changes the color of the indicator:
Green
— moisture below 45 ppm (dry)
Chartreuse — 45 to 130 ppm (caution!)
Yellow
— moisture above 130 ppm (wet)
Change filter driers at the first sign of moisture in the sys-
tem. See Carrier Charging Handbook for more information.
IMPORTANT: Unit must be in operation at least
12 hours before moisture indicator can give an accu-
rate reading. With unit running, indicating element must
be in contact with liquid refrigerant to give a true
reading.
Filter Driers —
type filter driers, one in each refrigeration circuit. The filter
driers are located in the condenser sections, accessible from
the right side of the unit.
49
400
REMOVE CHARGE IF BELOW CURVE
200
250
300
LIQUID PRESSURE AT LIQUID VALVE (PSIG)
1
⁄
-in. (6.4-mm) pipe plug at the com-
4
A clear flow of liquid
The 48/50MP units use replaceable core
350
400
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