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Pump Down Procedure
Use a transfer cylinder when recovering refrigerant to be re used. Using modified
refrigerant vessel may cause explosion and cause damage or personal injury.
Objective of Pump Down
For product repairs and indoor unit relocation, pump down operation must be done recover the
refrigerant into the outdoor unit.
Cautions When Performing Pump Down
Product limits amount of refrigerant in the outdoor unit due to slim design.
Collect the majority of the refrigerant in the system in an empty refrigerant vessel and perform
a pump down operation with remaining refrigerant. Maximum amount of refrigerant is 5Kg.
If the amount of refrigerant exceeds maximum allowable limit, increased pressure may cause
compressor trip or a burn out.
Cautions When Performing Pump Down
1
Close the manifold gauge.
2
Close the liquid side service valve.
3
Press the K2 button on the outdoor unit PCB three times. (
will be displayed on outdoor unit PCB LED.)
4
Observe low pressure side using manifold gauge when the compressor moves.
5
When the pressure on low pressure side decrease below 0 MPa(0 kgf/cm²) close the gas side
service valve and end the pump down operation.
( To end the pump down operation, press the K2 button once more or press K3 button to reset.)
Note
Relocation of the Air to water heat pump
Refer to this procedure when the unit is relocated.
Carry out the pump down procedure (refer to the details of ‘pump down’).
Collecting refrigerant may be hard, since multi type products exceeds allowable charging
amount of refrigerant in the outdoor unit to support long piping. (Refer to page 41.)
Remove the power cord.
Disconnect the assembly cable from the indoor and outdoor units.
Remove the flare nut connecting the indoor unit and the pipe.
At this time, cover the pipe of the indoor unit and the other pipe using a cap or vinyl plug to
avoid foreign material entering.
Disconnect the pipe connected to the outdoor unit.
At this time, cover the valve of the outdoor unit and the other pipe using a cap or vinyl plug
to avoid foreign material entering.
Make sure you do not bend the connection pipes in the middle and store together with the cables.
Move the indoor and outdoor units to a new location.
Remove the mounting plate for the indoor unit and move it to a new location.
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