Carrier 48GC04 - Puron (R-410 A) Refrigerant; Refrigerant Charge; Cooling Charging Charts

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PURON (R-410A) REFRIGERANT

This unit is designed for use with Puron

(R-410A) refrigerant.

Do not use any other refrigerant in this system.

Puron (R-410A) refrigerant is provided in pink (rose) colored

cylinders. These cylinders are available with and without dip

tubes; cylinders with dip tubes will have a label indicating this

feature. For a cylinder with a dip tube, place the cylinder in the

upright position (access valve at the top) when removing liquid

refrigerant for charging. For a cylinder without a dip tube, in-

vert the cylinder (access valve on the bottom) when removing

liquid refrigerant.

Because Puron (R-410A) refrigerant is a blend, it is strongly

recommended that refrigerant always be removed from the cyl-

inder as a liquid. Admit liquid refrigerant into the system in the

discharge line. If adding refrigerant into the suction line, use a

commercial metering/expansion device at the gage manifold;

remove liquid from the cylinder, pass it through the metering

device at the gage set and then pass it into the suction line as a

vapor. Do not remove Puron (R-410A) refrigerant from the

cylinder as a vapor.

Refrigerant Charge

Amount of refrigerant charge is listed on the unit’s nameplate.

Refer to Carrier GTAC2-5 Charging, Recovery, Recycling and

Reclamation training manual and the following procedures.

Unit panels must be in place when unit is operating during the

charging procedure.

NO CHARGE

Use standard evacuating techniques. After evacuating system,

weigh in the specified amount of refrigerant.

LOW-CHARGE COOLING

Using Cooling Charging Charts, Fig. 24-29, vary refrigerant

until the conditions of the appropriate chart are met. Note the

charging charts are different from type normally used. Charts

are based on charging the units to the correct sub-cooling for

the various operating conditions. Accurate pressure gage and

temperature sensing device are required. Connect the pressure

gage to the service port on the liquid line. Mount the tempera-

ture sensing device on the liquid line and insulate it so that out-

door ambient temperature does not affect the reading. Indoor-

air cfm must be within the normal operating range of the unit.

EXAMPLE:

Model 48GC*M04

Outdoor Temperature. . . . . . . . . . . . . . . . 85°F (29°C)

Suction Pressure. . . . . . . . . . . . . . . . . . . . 140 psig (965 kPa)

Suction Temperature should be . . . . . . . . 60°F (16°C)

USING COOLING CHARGING CHARTS

Take the outdoor ambient temperature and read the liquid pres-

sure gage. Refer to chart to determine what liquid temperature

should be. If liquid temperature is low, add refrigerant. If liquid

temperature is high, carefully recover some of the charge. Re-

check the liquid pressure as charge is adjusted.

COOLING CHARGING CHARTS

Fig. 24 — Cooling Charging Chart - 3 Ton

Fig. 25 — Cooling Charging Chart - 3 Ton with Hot

Gas Reheat (Humidi-MiZer

System) Option

48GC SIZE DESIGNATION NOMINAL TONS REFERENCE

04 3

05 4

06 5

1034 1379 1723 2068 2413 2758 3102 3447 3792 4136

-6.7

4.4

15.5

26.6

37.7

48.8

59.9

100

120

140

150 200 250 300 350 400 450 500 550 600

Compressor Discharge Pressure

3 Ton Mid-Tier CHARGING CHART

(Unit must run high stage compressor and

outdoor fan on high speed)

Remove Charge if Below the Curve

Add Charge if Above the Curve

48TC003186 REV -

Outdoor Coil Leaving Temperature

°C °F

psig

Kpa