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Charging the Remaining Refrigerant
Prerequisites
- Check that the outdoor unit switch is turned on before you start the compressor.
- Remove the refrigerant steel vessel after checking that no more refrigerant is required.
- Charge refrigerant in an amount exactly as standard charge required. Otherwise, the devices may be damaged.
Procedure
- Tap Start on the home screen and confirm it.
- Choose to enter the diagnostic mode.
- Change the compressor rotational speed to 3000 rpm.
- Charge refrigerant on the basis of the precharging.
- If there are no low-temperature components, open the low-pressure valve of the pressure gauge, and charge the remaining refrigerant from the low-pressure needle valve in small flow or intermittently.Figure 4-28 Precharging refrigerant into the system without a low-temperature component
(1) Refrigerant cylinder
(2) Electronic scale
(3) Pressure gauge
(4) Connection nut
(5) Low-pressure needle valve
(6) Exhaust pipe needle valve
- If there are low-temperature components, open the low-pressure valves of pressure gauge 1 and pressure gauge 2, and charge the remaining refrigerant from the low-pressure needle valves in small flow or intermittently.Figure 4-29 Precharging refrigerant into the system with a low-temperature component
(1) Refrigerant cylinder
(2) Electronic scale
(3) Pressure gauge 1
(4) Pressure gauge 2
(5) Connection nut
(6) Low-pressure needle valve
(7) Exhaust pipe needle valve
(8) Liquid pipe needle valve
- If there are no low-temperature components, open the low-pressure valve of the pressure gauge, and charge the remaining refrigerant from the low-pressure needle valve in small flow or intermittently.
- On the home screen, choose , and view Suction pressure and Discharge pressure to determine whether they are within normal ranges. Choose , and view the EEV suction superheat degree to determine whether it is within normal ranges.Table 4-13 Normal discharge pressure ranges
Ambient Temperature
Discharge Pressure Range
Suction pressure range
Overheating degree range
< 15°C
1.5–2.5 MPa
0.7–1.2 MPa
8–15°C
15–35°C
1.5–3.1 MPa
35–45°C
2.5–3.8 MPa
> 45°C
3.1–4.15 MPa
If the suction pressure, discharge pressure, and suction overheating degree is without normal ranges, check and make sure that:
- Charge refrigerant in an amount exactly as standard charge required. (Refrigerant charging too much would result in high discharge pressure. Refrigerant charging too little would result in low suction pressure, low discharge pressure, and high suction overheating degree.)
- The air inlet and outlet of outdoor unit are without block. (The air inlet and outlet blockage would result in high discharge pressure.)
- After charging refrigerant, close all valves.
- Tap
to exit the diagnostic mode.
- Tap Shutdown on the home screen and confirm it.
to exit the diagnostic mode.