Daikin RXTA30B2V1B Service Manual page 219

To perform refrigerant pump down operation
Refrigerant piping repair
RXTM-R+RXTP-R+ARXTP-R+RXTA-B+FTXTA30B2V1B(W)
(B)+FTXTM30+40R2V1B+FTXTP25+35M5V1B+ATXTP25+35M5V1B
R32 Optimized Heating 4 Split
ESIE21-12A – 2022.02
▪ Make sure to use the appropriate equipment and tools according to the
refrigerant and unit type.
▪ R32 can be charged in gas phase.
▪ Make sure to use a digital scale (no charging cylinder).
▪ Execute correct vacuum drying procedure after repair:
- –0.1 MPa / –760 mm Hg / –750 Torr / –1 bar for at least 1 hour.
- Connect the unit according to the available service ports.
- Use related field setting where necessary to open expansion valve / solenoid
valve.
The unit is equipped with an automatic pump down operation which will collect all
refrigerant from the field piping and indoor unit in the outdoor unit. To protect the
environment, make sure to perform the following pump down operation when
relocating the unit.
DANGER: RISK OF EXPLOSION
Pump down – Refrigerant leakage. If you want to pump down the system, and there
is a leak in the refrigerant circuit:
▪
Do NOT use the unit's automatic pump down function, with which you can collect
all refrigerant from the system into the outdoor unit. Possible consequence: Self-
combustion and explosion of the compressor because of air going into the
operating compressor.
▪
Use a separate recovery system so that the unit's compressor does NOT have to
operate.
CAUTION
Some outdoor units are equipped with a low pressure switch to protect the
compressor by switching it off. NEVER short‑circuit the low pressure switch during
pump down operation.
1 Remove the refrigerant connection cover, see
2 Remove the cap from the stop valves.
3 Perform pump down operation, see installer reference guide for the correct
procedure.
4 After 5~10 minutes (after only 1~2 minutes in case temperature <–10°C),
close the liquid stop valve using a hexagonal wrench.
5 Check the manifold if vacuum is reached. Close the gas stop valve and stop
forced cooling operation.
▪ Make sure to cover open pipe ends during repair so no dust or moisture can
enter.
▪ Make sure to re‑apply insulation removed during repair.
5 Third party components
|
4
"4.17 Plate work" [ 144].
Service manual
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