Carrier X-POWER Series Service Manual page 117

Carrier service manual
3.4. Recharge Refrigerant
3.4.1 Operation procedure for recharging refrigerant
3.4.1.1 Operation procedure
Calculate the required refrigerant volume by the length of liquid pipe → recharging refrigerant.
※ The refrigerant volume from factory does not include the recharged amount of the pipeline extending.
3.4.1.2 Detailed steps for recharging refrigerant
1. Make sure vacuum drying is qualified before recharging refrigerant.
2. Calculate the required refrigerant volume by the diameter and the length of liquid pipe.
3. Use electronic scale or fluid infusion apparatus to weight the recharged refrigerant volume.
4. Use soft pipe to connect refrigerant cylinder, pressure gauge, and examine valve of outdoor unit. And
recharge with liquid mode. Before recharging, eliminate the air in the soft pipe and pressure gauge's pipe.
5. After finishing the recharging, by the gas leak detector or soap water, to detect whether there is
refrigerant leakage in expansion part of indoor and outdoor units.
6. Write the recharged refrigerant volume in the indicating plate of outdoor unit.
Caution
1) The recharged refrigerant volume must be calculated according to the formula in the technical
reference of outdoor unit. It isn't allowed to calculate by running current, pressure and temperature.
Because current and pressure is changeable due to the difference of temperature and length of pipeline.
2) In the cold ambient, use warm water and hot wind to warm up refrigerant storage cylinder, and don't
allow heating up directly by flame.
3.4.1.3 Recharging R410A refrigerant
If R410A refrigerant is adopted, the tool shall be different. Confirm the following items before Recharged:
1) The different vacuum pump with one-way valve.
2) The different pressure gauge: the nut of connector and pressure scale are different.
3) The different recharging soft pipe and connector.
4) The charging method is different. Recharge into the outdoor unit with liquid phase.
5) The different leak detector.
3.4.2 Calculating the recharged refrigerant volume
Calculate the recharged refrigerant volume by the length and diameter of liquid pipe of indoor units
Diameter of Liquid Pipe
1/4" (6. 4)
3/8" (9. 53)
1/2" (12. 7)
5/8"(Ф15. 9)
Calculating formula (R410A):
The recharged volume: R (kg) = (L1×0. 023 kg/m) + (L2×0. 060 kg/m) + (L3×0. 120 kg/m) + (L4×0.180
kg/m) + (L5×0. 270 kg/m) + (L6×0. 380 kg/m) + (L7×0. 520kg/m) + (L8×0. 680kg/m)
L1: Actual total length of Φ6.35 liquid pipe (m); L2: Actual total length of Φ3/8(Φ9.53) liquid pipe (m);
L3: Actual total length of Φ12.7 liquid pipe (m); L4: Actual total length of Φ15.9 liquid pipe (m);
L5: Actual total length of Φ19.1 liquid pipe (m); L6: Actual total length of Φ22.2 liquid pipe (m);
L7: Actual total length of Φ25.4 liquid pipe (m); L8: Actual total length of Φ1-1/8(Φ28.6) liquid pipe (m)
Installation
R410A
Equivalent Refrigerant for
Pipe Length of 1m (kg/m)
0.023
0.060
0.120
0.170
Diameter of Liquid Pipe
3/4''(Ф19. 1)
55/64''(Ф22. 2)
63/64''(Ф25. 4)
1-1/8''(Ф28. 6)
R410a DC Inverter 60Hz
Equivalent Refrigerant for
Pipe Length of 1m (kg/m)
0.270
0.380
0.520
0.680
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