Vacuum Process; Additional Charging - Fujitsu AJ**A72LBTF Installation Instruction Sheet

5.2. VACCUM PROCESS
• If the system is not evacuated sufficiently, its performance will drop.
• The location from which to evacuate the system differs whether 1 outdoor unit or multiple outdoor units are
connected.
Evacuation procedure
• One outdoor unit connected:
1. Remove the flares at the gas pipe and liquid pipe, and make sure the valves are closed.
2. Remove the charging cap.
3. Connect a vacuum pump and a pressure gauge to a charging hose and connect it to the charging port.
4. Evacuate the indoor unit and the pipe joint until the pressure gauge reads –76 cmHg.
Evacuate from both the gas pipe and the liquid pipe.
5. Continue evacuating the system for 1 hour after the pressure gauge reads –76 cmHg.
6. Remove the charging hose and install the charging cap.
• Multiple outdoor units connected:
1. Remove the flares at the gas pipe, liquid pipe, and oil pipe, and make sure the valves are closed.
2. Remove the charging cap.
3. Connect a vacuum pump and a pressure gauge to a charging hose and connect it to the charging port.
4. Evacuate the indoor unit and the pipe joint until the pressure gauge reads –76 cmHg.
Evacuate from 3 locations: the gas pipe, liquid pipe, and oil pipe.
5. Continue evacuating the system for 1 hour after the pressure gauge reads –76 cmHg.
6. Remove the charging hose and install the charging cap.

5.3. ADDITIONAL CHARGING

• After evacuating the system, add refrigerant.
• Do not charge the system with a refrigerant other than R410A.
• Do not reuse recovered refrigerant.
• Use an electronic scale to measure the charging amount of refrigerant.
Adding more refrigerant than the specified amount will cause a malfunction.
• Charge refrigerant using the liquid pipe.
Adding refrigerant through the gas pipe will cause a malfunction.
• Add refrigerant by charging the system with the refrigerant in the liquid state. If the refrigerant cylinder is
equipped with a siphon, it is not necessary to place the cylinder upright.
Procedure for charging the system with refrigerant
1. Remove the charging cap from the liquid pipe.
2. Attach a charging hose to the refrigerant cylinder, and connect it to the charging port.
3. Add refrigerant by calculating the additional refrigerant volume in accordance with the calculation formula indicated below.
4. Remove the charging hose and install the charging cap.
5. Remove the body caps (gas pipe, liquid pipe, and oil pipe {if multiple units are installed}), and open the valves.
6. Close the body caps.
7. After adding refrigerant, indicate the added charging volume on the unit.
* Tighten the body caps and charging caps to the torque values specified in the Table 4.7-2.
To open and close the valves,
Use an M4 hexagon wrench for liquid and oil pipes.
Use an M10 hexagon wrench for gas pipes.
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CAUTION
CAUTION
29 26/8/2008, 18:23
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