External Factors; Checking Procedures - Daikin FTXP20-71L Service Manual

4 | Third party components

4.3 External factors

4.3.1 Checking procedures

To check the outdoor temperature
Service manual
152
to be lower. In some cases the vacuum pump may NOT be able to achieve these
pressures. If possible, heat the locations where moisture is expected.
As a general target, the values below CAN be used as reference to achieve a proper
vacuum on the unit:
▪ Absolute pressure below 270 Pa MUST be reached. The time needed for the
pressure to lower is also depending on the moisture amount. If it takes very long
or it is hard to reach the pressure, this MIGHT be an indication of moisture
presence, so the vacuum pump will need to run longer.
▪ After stopping the vacuum pump, the absolute pressure MUST be kept below
270 Pa for at least 30 minutes, without a significant increase of pressure. If
pressure increases significantly, this is an indication of the presence of moisture
in the system.
▪ If multiple vacuum cycles need to be performed, break the vacuum between the
cycles using dry nitrogen.
Depending on the site conditions, as mentioned above, lower pressure values
MIGHT be needed to allow the boiling of the moisture in the system. The table
below shows the boiling point of water for different absolute pressures.
Pressure (absolute)
Micron / Torr
760000 / 760
50000 / 50
10000 / 10
2000 / 2
1000 / 1
500 / 0.5
1 The temperature ranges for the different operation modes of the unit can be
found in the databook on Business Portal.
INFORMATION
If the outdoor temperature is outside the range of operation, the unit may NOT
operate or may NOT deliver the required capacity.
Is the outdoor temperature within the
operating range?
Yes
No
Mbar / Pa
1013 / 101325
66 / 6666
13 / 1333
2.6 / 266
1.33 / 133
0.66 / 66
Action
Return to the troubleshooting of the
specific error and continue with the
next procedure.
Wait for the outdoor temperature to
return within the operating range.
ATXP20~35 + FTXP20~71 + ARXP20~35 + RXP20~71
Boiling point
°C
100
38
11
−10
−18
−24
Split Comfora R32
ESIE18-01E – 2023.01