Daikin VRV REYQ96MTJU Design, Installation & Testing Instruction page 29

Si39-406
Refrigerant Pipe
Flushing is a method of cleaning extraneous matter out of pipes using
Flushing
pressurized gas.
[3 major effects]
1. Removal of oxidation bubbles formed inside copper pipes when "nitrogen replacement is
2. Removal of extraneous material and moisture from pipes when covering has been insufficient
3. Checks connections in pipes linking outdoor and indoor units (Both liquid and gas pipes)
[Example of procedure]
1. Set pressure regulator on nitrogen cylinder.
2. Connect the charge hose from the pressure regulator to the service port on the liquid pipe side
3. Fit blanking plugs to all indoor units (B) other than unit A.
4. Open the main valve on the nitrogen cylinder and set the pressure regulator to 72 psi.
5. Check that the nitrogen is passing through the unit A liquid pipe.
General Information
insufficient" during soldering work
∗The gas used must be nitrogen.
(There is a danger of condensation if fleon or carbon dioxide are used and oxygen carries the
risk of explosions.)
of the outdoor unit.
Installation
23