Daikin Altherma 3 M - Page 98

3 | Components
Service manual
98
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
Are the measured voltages correct? Action
Yes Perform a position check of the 4-way
valve, see "3.2.1Checking
procedures"[496].
No Perform a check the main PCB, see
"3.14Main PCB"[4171].
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.
Result: The measured voltage MUST be:
Unit Voltage in Heating
mode
Voltage in Cooling
mode
1‑phase outdoor unit 230VAC 0VAC
3‑phase outdoor unit 12VDC 0VDC
Is the measured voltage correct? Action
Yes Perform a position check of the 4-way
valve, see "3.2.1Checking
procedures"[496].
No Perform a check the main PCB, see
"3.14Main PCB"[4171].
When outdoor unit is combined with Heating only indoor unit
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 Defrost mode.
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:
Unit Voltage in Heating
mode
Voltage in Defrost mode
1‑phase outdoor unit 230VAC 0VAC
3‑phase outdoor unit 12VDC 0VDC