Refrigerant Charge; Cooling Charging Charts - Carrier 50FCQ 04-07 Series Service And Maintenance Instructions

Refrigerant Charge

Amount of refrigerant charge is listed on the unit's nameplate. Re-
fer to Carrier GTAC2-5 Charging, Recovery, Recycling and Rec-
lamation 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. 23-27, 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 operat-
ing conditions. Accurate pressure gauge and temperature sensing
device are required. Connect the pressure gauge to the service port
on the liquid line. Mount the temperature sensing device on the
liquid line and insulate it so that outdoor ambient temperature does
not affect the reading. Indoor-air cfm must be within the normal
operating range of the unit.
.
50FCQ SIZE DESIGNATION
04
05
06
07
EXAMPLE:
Model
Outdoor Temperature
Suction Pressure
Suction Temperature should be
USING COOLING CHARGING CHARTS
Take the outdoor ambient temperature and read the liquid pressure
gauge. Refer to chart to determine what liquid temperature should
be. If liquid temperature is low, add refrigerant. If liquid tempera-
ture is high, carefully recover some of the charge. Recheck the liq-
uid pressure as charge is adjusted.
NOMINAL TONS REFERENCE
3
4
5
6
50FCQA04
85°F (29°C)
140 psig (965 kPa)
65°F (16°C)

COOLING CHARGING CHARTS

Cooling Charging Chart Std 3 Ton Heat Pump
(Unit must be operated in cooling mode)
1241 180
1172 170
1103 160
1034 150
965 140
896 130
827 120
758 110
689 100
620 90
551 80
30 35 40 45
–1.1 1.7 4.5 7.2
SUCTION LINE TEMPERATURE [°F/°C]
Fig. 23 — Cooling Charging Chart — 3 Ton,
Cooling Charging Chart Std 4 Ton Heat Pump (Single Phase)
(Unit must be operated in cooling mode)
1241 180
1172 170
Add Charge if Above the Curve
1103 160
1034 150
965 140
896 130
827 120
758 110
689 100
620 90
551 80
30 35 40 45
–1.1 1.7 4.5 7.2
SUCTION LINE TEMPERATURE [°F/°C]
Fig. 24 — Cooling Charging Chart — 4 Ton,
16
R-410A Refrigerant
50 55 60 65 70 75 80
10.0 12.8 15.6 18.3 21.1 23.9 26.7
48TC003781
50FCQA04
R-410A Refrigerant
Remove Charge if Below the Curve
50 55 60 65 70 75 80
10.0 12.8 15.6 18.3 21.1 23.9 26.7
48TC005844
50FCQC05
OUTDOOR
TEMP
°F / °C
115 / 46
105 / 41
95 / 35
85 / 29
75 / 24
65 / 18
55/ 13
45/ 7
85 90
29.5 32.2
A
OUTDOOR
TEMP
°F / °C
115 / 46
105 / 41
95 / 35
85 / 29
75 / 24
65 / 18
55/ 13
85 90
29.5 32.2
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