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Pump Down Operation
2.
Pump Down Operation
2.1
Pump Down Operation
Pump down operation is carried out when refrigerant is moved to outdoor unit if the indoor unit is
necessary to disconnect or replacing. In this case, outdoor unit operates in the cooling mode and
indoor unit's electronic expansion valves open for 30 minutes.
2.1.1
Method
1. Fully shut the liquid side stop valves. (Leave fully open the gas side stop valve)
2. Set to pump down mode in setting mode 2 as per table below and execute pump down
„ Outdoor unit operate for approximately 30 minutes.
3. After unit stopping, shut the stop valve of the gas pipe.
Setting of Pump Down Mode
Hold down the Mode button for 5 seconds to change to setting
Mode 2.
Push SET button and select LED display to "Pump down operation".
Push the RETURN button.
Push SET button and select LED display as shown right.
Push the RETURN button twice to start operation.
During pump down operation, low pressure
level is displayed as shown right.
Pump down operation completed
„ Final pressure level is shown with blinking or H2P is shown ON.
Push MODE button once to complete this procedure.
560
operation.
Setting Method
Special Service Mode UM Combination "MA1R Series" Using R-407C
H1P H2P H3P H4P H5P H6P H7P
8
8
8
8
8
9
Over 0.343MPa
8
Below 0.343MPa
8
Below 0.245MPa
8
Below 0.147MPa
8
8
8
PACD011001C2
LED Display
7
7
7
7
7
7
7
8
8
8
7
7
7
7
7
7
7
7
7
9
7
7
7
7
8
9
7
7
7
7
8
8
8
8
8
8
7
7
8
8
8
7
7
7
8
8
7
7
7
7
8
9
9
9
9
7
7
7
7
8
7
7
9
7
7
7
8
8
8
8
9
7
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- Mx1 Series
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Troubleshooting
