30
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
f
Product limits amount of refrigerant in the outdoor unit due to slim design.
f
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.
f
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 one time. ( 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.)
• Use a transfer cylinder when recovering refrigerant to be reused. Using modified refrigerant vessel may
cause explosion and cause damage or personal injury.
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 31.)
• 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.
CAUTION
NOTE
Pump down procedure
