Carrier service manual R410a DC Inverter 60Hz
Installation 129
1. Function: use pressure gas to flush pipeline (raw material or welded assembly) for eliminating dust,
trash and moisture. Solid impurity is hard to be washed out, so special attention shall be drawn to the
protection of copper pipeline during construction.
2. Purpose
1) Eliminate oxide powder or part oxide layer in copper pipe.
2) Help to clear out dirt and humidity in pipe.
3. Risk in case of no flushing:
If the remaining solid impurity and moisture in pipeline could not be eliminated effectively, serious
malfunctions shall happen, such as ice blockage, dirt blockage and compressor being jammed.
3.1.5.2 Procedure of flushing
1. Mounting pressure adjusting valve on nitrogen gas cylinder. The applied gas must be nitrogen. If
adopting polytetrafluoro ethylene or carbon dioxide, there is a risk of condensation. If using oxygen,
there is a risk of explosion.
2. Making use of inflation tube to connect outlet of pressure adjusting valve and inlet at liquid pipe side of
outdoor unit.
3. Use blind plug to block all connectors of liquid side copper line (including unit B) soundly, excluding
indoor unit A.
4. Turn on nitrogen gas cylinder valve, and then pressurize to 5kgf/cm
2
gradually through adjusting
valve.
5. Check whether nitrogen has passed through the liquid pipe at the side of indoor unit A. Connector at
the side of indoor unit body has been covered by tape to prevent the entering of dirt.
3.1.5.3 Detailed steps for flushing
1. Hold proper blockage material (such as block bag and white cotton) to push against the main pipe
opening at the gas side of indoor unit.
2. When pressure increases and hands could not push against the opening, suddenly release pipe
opening (flushing for first time).
Repeat above step1 and step 2 to re-flush dirt (flushing for multi-times)
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