Installation and Commissioning Guide - MultiElite 2 Split System
Doc. No. 9590-5009
Ver. 1 211221
32
Installation and Commissioning Guide
Multi Split System
13. Air Evacuation
Preparations and Precautions
Air and foreign matter in the refrigerant circuit can cause abnormal rises in pressure, which can damage the air
conditioner, reduce its efficiency, and cause injury. Use a vacuum pump and manifold gauge to evacuate the refrigerant
circuit, removing any non-condensable gas and moisture from the system.
Evacuation should be performed upon initial installation and when unit is relocated.
Before Performing Evacuation
1. Check to make sure the connective pipes between the indoor and outdoor units are connected properly .
2. Check to make sure all wiring is connected
Evacuation Instructions
Before using a manifold gauge and a vacuum pump, read their operation manuals to make sure you know how to use
them properly.
Evacuation Instructions
NOTE:
OPEN VALVE STEMS GENTLY
DO NOT
Preparations and Precautions
BEFORE PERFORMING EVACUATION
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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 pump until the Compound Meter reads 500 microns.
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.
NOTE
If there is no change in system pressure, unscrew the cap from the packed valve (high pressure valve). If there is a change in
system pressure, there may be a gas leak.
