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12
“PUMP DOWN”
EXECUTION.
12.1 PURPOSE OF “PUMP DOWN”.
To repair products and transfer the indoor unit, the pump down
operation can be made to recover the refrigerant in the outdoor
unit.
In particular for product repairs, it is recommended to store the
refrigerant in a cylinder, using a recovery unit (see current legis-
lation in the country of destination).
12.2 IMPORTANT WARNINGS FOR “PUMP DOWN”
EXECUTION.
- e slim design of the product limits the amount of refrigerant
in the outdoor unit.
- Collect the majority of the system’s refrigerant in a cylinder
approved for refrigerant recovery and perform pump down for
the remaining refrigerant. e maximum amount of refrigerant
is 1.8 kg.
- If the refrigerant exceeds the maximum allowed limit, a pressure
increase could cause a compressor error or its failure.
1. Close the pressure gauge.
2. Activate the unit in cooling test mode by pressing the button
K2 once.
3. When the compressor has been running for 5 minutes, close
the service valve on the liquid side.
4. Observe the low-pressure side using a pressure gauge unit.
5. When the pressure gauge reads “0”, close the valve on the
low-pressure side by turning it clockwise.
6. Press K3 to interrupt the operation of the unit.
7. Close each cap of the valves.
ATTENTION:
- use a cylinder approved for recovery
when recovering the refrigerant to be
reused. Using a modied vessel for the re-
frigerant can cause explosions and personal
harm or injury.
Repositioning the condensing unit.
- Refer to this procedure when transferring the unit.
- Perform the pump down procedure. (Refer to the
pump down details.)
- It can be dicult to recover the refrigerant when the re-
charged amount exceeds the standard amount to support
long pipes. (See page 34).
- Remove the power cable.• Disconnect the assembly cable
from the indoor and outdoor unit.• Remove the countersunk
nuts which connect the indoor unit and piping.
- en cover the pipes of the indoor unit and the other pipes
with a vinyl plug or cap to keep foreign material out.
- Detach the pipes connected to the outdoor unit. en cover
the pipes of the outdoor unit and the other pipes with a vinyl
plug or cap to keep foreign material out.
- Make sure not to bend the connection pipes in the middle
and to put them back with the cables.
- Move the indoor and outdoor units to the new position.
- Remove any installation accessories of the indoor unit and
move it to the new position.
ATTENTION:
- before moving the unit, be sure to
carefully read how to recover the re-
frigerant on page 13.
- While recharging refrigerant R-32
when it was completely emptied, make
sure to charge only the amount a re-
frigerant charged in the factory.
- When you open the cooling circuit, make
sure to have reached a good degree of vacu-
um before charging the refrigerant.
- Use an electronic scale to measure the
amount of refrigerant, and make sure that
only the indicated amount is charged.
ATTENTION:
- if more refrigerant than that specied
on the label is charged, there is a risk
of re due to refrigerant leaks.
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