Haier GE NS22HM Installation Instructions Manual

Also see for GE NS22HM: Service manual

Page 8 of 26508311G01 / 31-5000754Issue 2250Flushing Line SetsIf the unit will be installed in an existing system that usesan indoor unit or line sets charged with R-22 refrigerant,installer must perform the following flushing procedure.NOTE: Existing system components (including line setand indoor coil) must be an AHRI match with the unit inorder to fulfill unit warranty requirements.Fire, Explosion and Personal Safetyhazard. Failure to follow this warningcould result in damage, personal injury ordeath.Never use oxygen to pressurize orpurge refrigeration lines. Oxygen, whenexposed to a spark or open flame, cancause fire and/or an explosion, that couldresult in property damage, personal injuryor death.WARNINGWhen using a high pressure gas such asnitrogen to pressurize a refrigeration or airconditioning system, use a regulator that cancontrol the pressure down to 1 or 2 psig (6.9to 13.8 kPa).WARNINGRefrigerant must be reclaimed in accordance withnational and local codes.WARNING1. Set the recovery machine for liquid recovery and startthe recovery machine. Open the gauge set valves toallow the recovery machine to pull a vacuum on theexisting system line set and indoor unit coil.2. Position the cylinder of clean R-410A for delivery ofliquid refrigerant and open its valve to allow liquidrefrigerant to flow into the system through the vaporline valve. Allow the refrigerant to pass from thecylinder and through the line set and the indoor unitcoil before it enters the recovery machine.3. After all of the liquid refrigerant has been recovered,switch the recovery machine to vapor recovery sothat all of the R-410A vapor is recovered. Allow therecovery machine to pull the system down to 0.4. Close the valve on the inverted R-410A drum and thegauge set valves. Pump the remaining refrigerant outof the recovery machine and turn the machine off.