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11 Disposal
Installer reference guide
24
RZAG71~140L7V1B
Split system air conditioners
4P418663-1 – 2016.02
11.2
About pump down
The unit is equipped with an automatic pump down function, with
which you can collect all refrigerant from the system into the outdoor
unit.
Example:
To protect the environment, pump down when relocating
the unit or when disposing of the unit.
NOTICE
The outdoor unit is equipped with a low pressure switch or
a low pressure sensor to protect the compressor by turning
it OFF. NEVER short-circuit the low pressure switch during
pump down operation.
11.3
To pump down
1
Turn ON the main power supply switch.
2
Make sure the liquid stop valve and the gas stop valve are
open.
3
Press the pump down button (BS4) for at least 8 seconds. BS4
is located on the PCB in the outdoor unit (see wiring diagram).
Result:
The compressor and outdoor unit fan start
automatically, and the indoor unit fan might start automatically.
4
±2 minutes after the compressor started, close the
liquid stop
valve
. If it is not closed properly during compressor operation,
the system cannot be pumped down.
5
Once the compressor stops (after 2~5 minutes), close the
gas
stop valve
.
Result:
The pump down operation is finished. The user
interface may display "
" and the indoor pump may continue
operating. This is NOT a malfunction. Even if you press the ON
button on the user interface, the unit will NOT start. To restart
the unit, turn OFF the main power supply switch and turn it ON
again.
6
Turn OFF the main power supply switch.
NOTICE
Make sure to reopen both stop valves before restarting the
unit.
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