11 Maintenance notes
Refrigerant collection method
SMGB0136 rev.0 - 07/2021
335
11
Process
No.
Procedure Remarks
8
Collect the refrigerant by means of the refrigerant collection:
Perform either A or B depending on the process 7.
A. The leak rate at the process 7 is within the specication
→Collect the refrigerant only at the low-pressure side.
B. The leak rate at the process 9 is greater than the
specication → Collect all the refrigerant of the outdoor unit
side by means of the machine.
• The discharge of the refrigerant in the atmosphere
is strictly forbidden. Make sure that the refrigerant is
collected by a refrigerant collector.
• Measure the quantity of the collected refrigerant and
record it.
9
After collecting the refrigerant, remove the charge hose at
the collector side of the low pressure side, so that the low
pressure side of the refrigerant cycle will be the atmosphere
pressure.
Make sure that there is no pressure increase of the low
pressure sides after collecting the refrigerant.
10 Cancel the forced open valve mode.
Make sure that the refrigerant cycle is the atmosphere
pressure. Otherwise, problems such as the blowing of
gas and the suction of the cutting material may occur
when you are removing the compressors.
11 Turn OFF the main switch of the outdoor unit. -
12
Perform the replacement of the compressor and the change
of the refrigerant oil according to the section “replacing the
compressor”.
• Make sure that you follow the instructions.
• Removing electrical box may be required.
• Measure the quantity of the refrigerant oil and record
it.
13
Perform the vacuum from the check joint of the low pressure
side.
• If you collect the refrigerant only on the low pressure
side (A in 8). You cannot perform the vacuum of the
refrigerant from the check joint of the high pressure
side.
14
Open the liquid stop valve and the gas stop valve completely
when you nish the vacuum.
-
15
Make sure that the power is turned OFF and attach the
following items: the power supply wire, the thermistor, the
crankcase heater, the 63H wiring, the panel and the nut.
-
16
Charge new refrigerant oil as the same quantity as the
collected refrigerant oil.
Perform the vacuuming from the check joint at a low and high
pressure sides.
Connect the charge hose to the charge port of return oil circuit
and charge the refrigerant oil.
• When the refrigerant oil is collected from the
accumulator or compressor, calculation for recharge
amount is required.
• Use a clean charge hose.
• Use a container with a small opening so that the
refrigerant oil does not absorb the moisture in the
atmosphere and work in a short time (approx. within
20 minutes).
17
Disconnect the charge hose from the charger port of return oil
circuit. Perform the vacuuming from the check joint at low and
high pressure sides.
-
18
Recharge the collected refrigerant (process No.8) from the
check joint at high pressure side.
For the remainded quantity:
Fully open the liquid and gas stop valve and set DSW4#1 to
ON side of OU PCB1.
Then recharge it from the liquid stop valve check joint during
cooling operation.
If the replacement of the compressor takes more than
two hours an additional charge of the refrigerant is
necessary.
Additional charge = (replacing time – 2 hours) x 0.5 kg.
19
Set the DSW back to the original setting. Make sure that all
the wirings to the compressor are connected correctly.
-
20 Check the liquid and gas stop valves are fully opened. -
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