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12.6.3 Relocation
1. Removing the air conditioning unit
a) Recovery of outdoor unit refrigerant by pumping down
Press “forced cooling button” (as a general rule, since 1998 the name of cooling testing button is changed,
and this name is unified within the air conditioning industry), and then you are able to start cooling operation
in which the room temperature is low, and you can recover the refrigerant from the outdoor unit.
1. Check the valve stems of two-way and three-way valves are open by being turned to anti-clockwise
(Remove the caps, and confirm the bars are fully open. Use hexagon wrench <4 mm> to open and close
the valves).
2. Press the “Emergency Operation” button of the indoor units for five seconds and release [Forced cooling
operation] (for old models, press “forced cooling” button). Then, operate the air conditioning unit for about
10 minutes.
3. Turn the stem of the two-way valve to the clock-wise and close the valve.
4. After about 2 ~ 3 minutes, turn the stem of the three-way valve quickly to the clock-wise, and stop the
operation.
Caution:
In the pump down operation, stop the compressor before removing the refrigerant pipes.
If you do not stop the compressor operation, and if the valve is open and remove the refrigerant pipes, the air
may be sucked into the system and causes extreme high temperature in the refrigerant cycle. This may result in
rupture or injury, etc.
5. Attach and tighten the caps of two-way and three-way valves with torque wrench.
6. Remove the connecting pipes (liquid side and gas side).
b) Removal of indoor and outdoor units
1. Remove the connecting pipes and wires between the indoor and outdoor units.
2. Attach capping flare nuts on the edges of the pipes, connecting the indoor and outdoor units, in order to
prevent dust and moisture get into the pipes.
3. Remove the indoor and outdoor units.
2. Unit installation
Use new refrigerant pipes for the installation, and perform air purging using vacuum pump and gas
leakage testing stated in 14.5.1.
12.6.4 Replacement of air conditioning units and evacuation (when re-using the existing
pipes)
When replacing the air conditioning units, you might use the existing pipes, but it is recommended to perform flaring
again. In case of unit replacement, even if the unit is new refrigerant air conditioner, if the refrigerant oil is different, it
may cause problem. Further, when re-using the existing refrigerant pipes, it is recommended to evacuate the pipes
as much as possible, due to the reason that much refrigerant oil may be attached on the surface of the pipes. If the
pipes are used without evacuation, the remaining refrigerant oil may cause under-performance and abnormal
refrigerant cycle caused by non-compatibility of those oils.
12.6.5 Inter-changeability of refrigerant
Do not operate air conditioning units inserting wrong (or mixed) refrigerant (R22, R410A, R32). It may cause mal-
function of the units, and at the same time, may cause serious incident such as rupture of the refrigerant cycle.
