Flushing Existing Line Set and Indoor Coil
This procedure should not be performed on systems which contain contaminants, such as compressor burn out.
CAUTION
When flushing existing line set and/or indoor coil, be sure to empty all existing traps. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the thermal expansion valve, reducing system performance and capacity. Failure to properly flush system as explained in these instructions will void warranty.
Required Equipment
The following equipment is needed to flush the existing line set and indoor coil (see Figure 8): Two clean R22 recovery bottles, an
Flushing Procedure
IMPORTANT: The line set and/or indoor coil must be flushed with at least the same amount of refrigerant that previously charged the system. Check the charge in the flushing cylinder before flushing the unit.
1.Remove existing R22 refrigerant using the appropriate procedure.
If the existing outdoor unit is not equipped with shutoff valves, or if the unit is not operational AND the existing
R22 refrigerant will be used to flush the system:
Disconnect all power to the existing outdoor unit. Connect the existing unit, a clean recovery cylinder, and the recovery machine according to the instructions provided with the recovery machine. Remove all R22 refrigerant from the existing system. Refer to the gauges after shutdown to confirm that the entire system is completely void of refrigerant. Disconnect the liquid and suction lines from the existing outdoor unit.
If the existing outdoor unit is equipped with manual shutoff valves AND new R22 refrigerant will be used to flush the system:
Start the existing R22 refrigerant system in cooling mode and close the liquid line valve. Pump all the existing R22 refrigerant back into the outdoor unit.
Flushing Connections
Note: The inverted R22 cylinder must contain at least the same amount of refrigerant as was recovered from the existing system.
Figure 8
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