Free match split type air conditioner / Installation Manual
33 / 44 EN
9.1 Safety precautions
A
Warning:
•
Use a vacuum pump with a gauge reading lower than -0.1MPa and an air discharge
capacity above 40L/min.
•
The outdoor unit does not need to be vacuumed. Do not open the outdoor unit’s gas
and liquid stop valves.
•
Ensure that the compound meter reads -0.1MPa or below after 2 hours. If after three
hours the gauge reading is still above -0.1MPa, check if there is a gas leak or water
inside the pipe. If there is no leak, perform another evacuation for 1 or 2 hours.
•
Do not use refrigerant gas to evacuate the system.
9.2 Evacuation in structions
Before using a manifold gauge and a vacuum pump, read their operation manuals to make sure you
know how to use them properly.
Manifold gauge
Low pressure valve
Compound gauge
Pressure gauge
High pressure valve
Charge hose
Vacuum pump
-76cmHg
Low pressure valve
Charge hose
Fig. 9.1
1. Connect the manifold gauge’s charge hose to the service port on the outdoor unit’s low pressure
valve.
2. Connect the manifold gauge’s charge hose from the to the vacuum pump.
3. Open the low pressure side of the manifold gauge. Keep the high pressure side closed.
4. Turn on the vacuum pump to evacuate the system.
5. Run the vacuum for at least 15 minutes, or until the compound meter reads -76cmHG (-1x105Pa).
6. Close the manifold gauge’s low pressure valve and turn off the vacuum pump.
7. Wait for 5 minutes, then check that there has been no change in system pressure.
9
Air evacuation