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FUNCTIONS TO BE IMPLEMENTED LOCALLY
Night operation control
• Low-noise operation is available during nighttime hours by connecting a commercially available timer and
separately sold applicable control wire TCB-KBOS1E. For more information, refer to the manuals of these parts.
• The power saving function of the air conditioner reduces the level of nighttime operating noise.
• Sufficient capacity for low-noise operation cannot always be provided, depending on external conditions, including
the outside air temperature.
Handling Existing Pipe
When using the existing pipe, carefully check 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 a flare nut to prevent gas leaks.
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 leaks.
When the pipe corresponds to any of the following, do not use it. Install a new pipe instead.
• The pipe has been opened (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 thicknesses.
• Do not use any pipe with a wall thickness less than these thicknesses due to insufficient pressure capacity.
Reference outside
diameter (mm)
Wall thickness (mm)
Ø9.5
0.8
Ø15.9
1.0
Ø19.1
1.0
• To use an existing Ø19.1 mm pipe, set bit 3 of SW802 (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.
Recovering Refrigerant
• Use refrigerant recovery switch SW801 on the P.C. board of the outdoor unit to recover refrigerant when the indoor
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.
Set SW804 on the P.C. board of the outdoor unit to all OFF, and then press SW801 for 1 second or more. The air
conditioner enters the forced cooling mode for up to 10 minutes.
Operate or handle the valve to recover refrigerant during this time period.
4.
Upon completion of refrigerant recovery, close the valve and press SW801 for at least 1 second to stop operation.
5.
Turn off the power.
DANGER
Be careful of electric shock because the P.C. board has an electrical current running through it.
SW802
When shipped from factory
When using existing pipe
12
3
4
ON
12
3
4
ON
1234
ON
1234
ON
Refrigerant
recovery switch
SW801
Optional
connector CN610
Special
operation select
switch SW804
Existing pipe
switch SW802
P.C. board
EN-33
EN-34
