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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 cylinder after ensuring that no more refrigerant needs to be charged.
- Charge refrigerant in an amount exactly as standard charge required. Otherwise, the devices may be damaged.
Procedure
- Tap Start on the home screen.
- Choose to enter the diagnostic mode.
- Set the compressor to 3000 rpm.
- Charge refrigerant on the basis of the precharging.
- If there is no low temperature component, 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 6-21 Precharging refrigerant when no low temperature component is configured
(1) Refrigerant cylinder
(2) Electronic scale
(3) Pressure gauge
(4) Connection nut
(5) Low-pressure needle valve
(6) Discharge pipe needle valve
- If there is a low temperature component, 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 6-22 Precharging refrigerant when a low temperature component is configured
(1) Refrigerant cylinder
(2) Electronic scale
(3) Pressure gauge 1
(4) Pressure gauge 2
(5) Connection nut
(6) Low-pressure needle valve
(7) Discharge pipe needle valve
(8) Liquid pipe needle valve
- If there is no low temperature component, 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. Table 6-6 Normal discharge pressure ranges
Outdoor Ambient Temperature
Discharge Pressure Range
Suction Pressure Range
< 15°C
1.5–2.5 MPa
0.7–1.2 MPa
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 and discharge pressure are not within the normal range, check the following items:
- 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 and low discharge pressure.)
- The air intake and exhaust vents of the outdoor unit are not blocked. (If the air intake vent and air exhaust vent are blocked, the discharge pressure will be high.)
- 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.