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12
FUNCTIONS TO BE IMPLEMENTED LOCALLY
Handling Existing Pipe
When using the existing pipe, carefully check it for
the following:
• Wall thickness (within the specified range)
• Scratches and dents
• Water, oil, dirt, or dust in the pipe
• Flare looseness and leakage from welds
• Deterioration of copper pipe and heat insulator
Cautions for using existing pipe
• Do not reuse the flare to prevent gas leak.
Replace it with the supplied flare nut and then
process it to a flare.
• Blow nitrogen gas or use an appropriate means
to keep the inside of the pipe clean. If discolored
oil or much residue is discharged, wash the pipe.
• Check welds, if any, on the pipe for gas leak.
When the pipe corresponds to any of the
following, do not use it. Install a new pipe instead.
• The pipe has been open (disconnected from
indoor unit or outdoor unit) for a long period.
• The pipe has been connected to an outdoor unit
that does not use refrigerant R22, R410A or
R407C.
• The existing pipe must have a wall thickness
equal to or larger than the following thickness.
Reference outside
diameter (mm)
• Never use any pipe with a wall thickness less
than these thicknesses due to insufficient
pressure capacity.
• To use an existing Ø19.0 mm pipe, set bit 5 of
SW801 (switch for existing pipe) on the P.C.
board of the outdoor unit to ON. In this case, the
heating performance may be reduced
depending on the outside air temperature and
room temperature.
21-EN
Wall thickness (mm)
Ø9.5
0.8
Ø15.9
1.0
Ø19.0
1.0
SW801 No.5
ON
ON
5 6
3
5
1 2 3 4
1 2
4
Recovering Refrigerant
• Use the refrigerant recovery switch SW802 on
the P.C. board of the outdoor unit to recover
refrigerant when the indoor unit or outdoor unit
is moved.
Procedure
1. Turn on the power of the air conditioner.
2. Select the FAN mode for indoor unit operation
with the remote controller.
3. Press the refrigerant recovery switch SW802
on the P.C. board of the outdoor unit to drive
the air conditioner into the forced cooling mode
for up to 10 minutes. Open the valve to start
refrigerant recovery.
4. Upon completion of refrigerant recovery, close
the valve and press SW802 for at least one
second to stop operation.
5. Turn off the power.
Take care for an electric shock because the
P.C.board is electrified.
6
– 21 –
Outdoor Unit Installation Manual
Outdoor unit P.C. board
SW802
for
refrigerant
recovery
SW801
for
existing
pipes
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