Carrier 50MP62L-10R, 48MPD Ð Charging Chart Unit 48/50MP90P, Ð Charging Chart Ð Unit 48/50MP10R

LIQUID TEMPERATURE AT LIQUID VALVE (DEG F)

150
125	ADD CHARGE IF ABOVE CURVE
100
75	REMOVE CHARGE IF BELOW CURVE
50

100	150	200	250	300	350	400
	LIQUID PRESSURE AT LIQUID VALVE (PSIG)

ALL OUTDOOR FANS MUST BE OPERATING

Fig. 58 Ð Charging Chart Unit 48/50MP90P

LIQIUD TEMPERATURE AT LIQUID VALVE (DEG F)

150

130

110

90

70

50

100

TEMPERATURELIQUID	(DEGVALVELIQUIDAT F)	150
		125
ADD CHARGE IF ABOVE CURVE			ADD CHARGE IF ABOVE CURVE
REMOVE CHARGE IF BELOW CURVE		100
		75	REMOVE CHARGE IF BELOW CURVE
		50

150	200	250	300	350	400	450
	LIQUID PRESSURE AT LIQUID VALVE (PSIG)					100	150	200	250	300	350	400

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

ALL OUTDOOR FANS MUST BE RUNNING

Fig. 59 Ð Charging Chart Ð Unit 48/50MP10R

Charging with Unit Off and Evacuated Ð 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 Ð 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) Ð All units are fac- tory charged with oil. Acceptable oil level for each compres- sor is from 3¤8 to 1¤8 (on 06E299, 1¤8 max) of sight glass (see 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. Ð Cryol 150A (factory oil charge)

Texaco, Inc.	Ð Capella WF-32-150
Witco Chemical Co.	Ð Suniso 3GS

Do not reuse drained oil, and do not use any oil that has been exposed to atmosphere.

ADD OIL Ð 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 ®ll 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.

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 Ð Pump down compressor to 2 psig (14 kPag). Loosen the 1¤4-in. (6.4-mm) pipe plug at the com- 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 Ð A clear ¯ow of liquid 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	Ð moisture below 45 ppm (dry)
Chartreuse Ð 45 to 130 ppm (caution!)
Yellow	Ð moisture above 130 ppm (wet)

Change ®lter driers at the ®rst 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 Ð The 48/50MP units use replaceable core type ®lter driers, one in each refrigeration circuit. The ®lter driers are located in the condenser sections, accessible from the right side of the unit.

49