Sanyo Big PACi 18 Series Technical Data & Service Manual page 178

Caution on Pump Down (Refrigerant
Recovery)
NO T E
Pump down cannot be performed when the tubing length
exceeds 30m. (There is a possiblilty of generating the
actuation of the excessive load protection system.)
In this case, collect the refrigerant by the refrigeant
collecting system.
1. Stop the unit operetion (cooling heating wind direction,
etc.).
2. Connect the manifold gauge to the service port of the
gas tube service valve.
3. Short-circuit the PUMP pin on the outdoor unit control
PCB for over 1 second.
• Refrigerant recovery will start and the unit starts
driving.
• During the refrigerant recovery. LED1 blinks and
LED2 lights up on the outdoor unit control PCB.
• Remote control display shows
4. Fully close the liquid tube service valve after 2 or 3
minutes. Pump down will start.
5. When the manifold gauge reduces to 0.2 - 0.1MPa.
fully close the gas tube service valve.
Then again short-circuit the PUMP pin (CN048).
Refrigerant recovery is finished.
• If operation is continued for over 10 minutes, the
unit stops even if the refrigerant recovery is not
completed. Check the liquid tube service valve
closed.
• When the PUMP pin (CN048) is shorted again
during refrigerant recovery the unit stops.
* For protection of the compressor do not drive until
the unit tubing side becomes negative pressure.
blinks.
PUMP pin (CN048) is
located on the outdoor
PCB as shown.
CAUTION
Pay much attention
to the fan of the out-
door unit as there is
danger of injury dur-
ing operation.
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