Daikin VRV RXYQ72-384XAYCA, Service Manual

Page: 193 / 419

SiUS342004EB Field Settings for Outdoor Unit
Part 5 Field Settings and Test Operation 186
Note(s)

Actual voltage value depends on multimeter characteristics (±143 VAC).
When operation parameters return to normal range, the capacity priority is switched OFF, enable to
reduce airflow rate depending on night-time low noise operation is still required (end time for
night-time low noise operation is not reached or external input night-time low noise operation is still
closed).
Next time graph shows the different steps during the power transistor check mode.

Switching sequence during power transistor check mode:
Power transistor check mode
disconnect fastened U/V/W from compressor!
Step 1:
Set 2-28
0 1
Press RETURN
twice
Step 2:
Set 2-28
1 0
Press RETURN
twice
Check
1
Check
2
Check
3
Magnet
switch
K1M
ON
Magnet
switch
K1M OFF
Voltage
output
U/V/W
Voltage
output
U/V/W
Frequency: 10 Hz
6 sec
3 sec
3 sec
30 sec
Check 4
Check
5
Check 1 : AC power input at terminals L1B, L2B, L3B (575 V unbalance maximum 2%).
Check 2 : DC voltage at connector X5A increases to ±750 VDC.
Check 3 : DC = 1.42 x VAC power supply at connector X5A
Check 4 : AC U/V/W 10 Hz intermediate
Check if difference is within 10 V (at fastened U/V/W).
Check 5 : Voltage drop (discharge capacitors DC)
Check if DC voltage at connector X5A increases to ±750 VDC.
note
[2-29]: Capacity priority
When the night-time low noise operation is in use, performance of system might
drop because airflow rate of outdoor unit is reduced.
Default value: 0. Capacity priority cannot be used.
Field setting 1: Capacity priority can temporary cancel the night-time low noise
operation. Capacity priority can be initiated when certain operation parameters
approach the safety setting:

Raise in high pressure during cooling.

Drop in low pressure during heating.

Raise of discharge pipe temperature.

Raise of inverter current.

Raise of fin temperature inverter PCB.