Daikin FTXP20-71L Service Manual page 47

ATXP20~35 + FTXP20~71 + ARXP20~35 + RXP20~71
Split Comfora R32
ESIE18-01E – 2023.01
When outdoor temperature is mild and unit can switch between heating and
cooling
INFORMATION
This procedure is ONLY possible when the outdoor temperature is within the
temperature range for both Heating and Cooling operation mode. See the
databook on Business Portal for the temperature range of the operation modes.
1 Connect the 4‑way valve connector to the appropriate PCB.
2 Turn ON the power using the respective circuit breaker.
3 Activate Heating operation via the user interface.
4 With the 4‑way valve connector connected to the PCB, measure the voltage
on the 4‑way valve connection of the PCB.
Result: The measured voltage MUST be 12 V DC.
INFORMATION
Actual energize voltage is ±310 V DC.12 V DC is used to keep the coil energized.
5 De-activate Heating and activate Cooling operation via the user interface.
6 Measure the voltage on the 4‑way valve connection on the PCB.
Result: The measured voltage MUST be 0 V DC.
Are the measured voltages correct?
Yes
No
When outdoor temperature does not allow the unit to run in cooling or heating
mode
INFORMATION
Follow this procedure when the outdoor temperature is outside the temperature
range for one of the operation modes (Heating or Cooling). The unit CANNOT
operate in the mode for which the outdoor temperature is outside its temperature
range. See the databook on Business Portal for the temperature range of the
operation modes.
1 Connect the 4‑way valve connector to the appropriate PCB.
2 Turn ON the power using the respective circuit breaker.
3 With the unit operating, connect the service monitoring tool to the unit and
check whether the unit is operating in Heating or Cooling mode.
4 With the 4‑way valve connector connected to the PCB, measure the voltage
on the 4‑way valve connection of the PCB. The measured voltage MUST be:
▪ 12 V DC when operating in Heating mode
▪ 0 V DC when operating in Cooling mode
INFORMATION
Actual energize voltage is ±310 V DC.12 V DC is used to keep the coil energized.
3
Action
Perform a position check of the 4-way
valve, see "3.1.1 Checking
4
procedures" [ 46].
Perform a check the main PCB, see
4
"3.7 Main PCB" [ 84].
Components
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Service manual
47