12.12 How to collect refrigerant
•
The refrigerant collection method when replacing the parts (compressor or cycle parts) of outdoor unit.
Process No.
Procedure
Remarks
1
Turn OFF the main switch of O.U.
-
2
Connect manifold to the check joint at low and high pressure side
in O.U.
-
3
Turn ON the main switch of O.U.
-
4
<In case that compressor operates.>
Perform pre-refrigerant collection during coolint test run.
•
Turn ON the dip switch (DSW4#1) of O.U. PCB1 and start
the test run.
•
The test run should be performed for approx. 20 min, (until
Ps>0.3 MPa, Td>75 °C)
•
Check the suction pressure “Ps” on 7-seg. of O.U. PCB1.
•
Close the gas valve inmediately. Perform the forced
stoppage by turning on the dip switch (DSW4#4) when Ps is
≤
0.2 MPa.
•
Cancel cooling operation (by DSW4#1 is OFF).
•
Cancel the forced stoppage (by DSW4#4 is OFF).
<In case that compressor does not operate.>
•
Close all the gas stop valves (at low and high pressure
sides).
After closing the gas stop valve, the decrease of Ps value is fast.
To guarantee the reliability of the Comp., make sure that the
decrease does not reach Ps<0.1 MPa when performing the
forced stoppage.
5
Close the liquid stop valve completely.
-
6
Collect refrigerant by a refrigerant collector. Collect the
refrigerant from the check joints at low and high pressure sides
in O.U. All the refrigerant of O.U. side is collected by a refrigerant
collector.
•
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.
7
After collecting the refrigerant, remove the charge hose at the
collector side, so that the inside of the refrigerant cycle will be the
atmosphere pressure.
•
Make sure that there is no pressure increase after collecting
the refrigerant and then remove the charge hose.
•
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 will occur when
removing the Comp.
8
Turn OFF the main switch of O.U.
-
9
Perform replacing Comp., return oil circuit or electrical parts.
Removing electrical box may be required.
Measure the quantity of the refrigerant oil and record it.
10
Charge the 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).
11
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.
, see on page 59
.
12
Recharge the collected refrigerant (process No.6) 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 O.U. PCB1.
Then recharge it from the liquid stop valve check joint during
cooling operation.
, see on page 61
.
13
Check the liquid and gas stop valves are fully opened.
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O.U.: Outdoor unit.
7-seg.: 7-segment.
Comp.: Compressor.
12 Maintenance notes
363
SMGB0065 rev. 1 - 12/2010
12
