Toshiba HWS-1103H-E, Installation Manual

Page: 23 / 114

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Air to Water Heat Pump
Installation Manual
EN
13
FUNCTIONS TO
BE IMPLEMENTED
LOCALLY
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
Hydro 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.
Recovering Refrigerant
• Use refrigerant recovery switch SW801 on the P.C.
board of the outdoor unit to recover refrigerant when
the Hydro or outdoor unit is moved.
• Before recovering the refrigerant in the existing
system, perform a cooling operation for at least
30 minutes.
Procedure
1. Drain off the water in the Hydro unit.
2. Turn on the power of the air to water heat pump.
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 to water heat pump 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.
Reference outside
diameter (mm)
Wall thickness (mm)
Ø9.5 0.8
Ø15.9 1.0
Ø19.0 1.0
SW801
SW804
ON
1 2 3 4
Refrigerant
recovery switch
SW801
22-EN