3.2.6 Setting of Vacuuming Mode
In order to perform vacuuming operation at site, fully open the expansion valves of indoor and outdoor units and
turn on some solenoid valves.
In "Setting Mode 2" with units in stop mode, set "B Refrigerant Recovery / Vacuuming mode" to ON. The
respective expansion valve of indoor and outdoor units are fully opened. "TEST OPERATION" and "UNDER
CENTRALIZED CONTROL" are displayed on the remote controller, and the indoor / outdoor unit operation is
After setting, do not cancel "Setting Mode 2" until completion of Vacuuming operation.
Use the vacuum pump to perform vacuuming operation.
Press Mode button "BS1" once and reset "Setting Mode 2".
3.2.7 Check Operation
To prevent any trouble in the period of installation at site, the system is provided with a test operation mode
enabling check for incorrect wiring, stop valve left in closed, coming out (or misplacing with suction pipe
thermistor) or discharge pipe thermistor and judgement of piping length, refrigerant overcharging, and learning for
the minimum opening degree of electronic expansion valve.
CHECK OPERATION FUNCTION
Cooling start control
Stability waiting operation
Refrigerant overcharge judgement
Pump down residual operation
Standby for restarting
Press the TEST button for 5 seconds.
10 seconds to 10 minutes
20 seconds to 2 minutes
• Stop valve close check
• Wrong wiring check
• Piping length check
LED display (H1P~H7P) (
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