Daikin EBLA04E V Series Service Manual page 110

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Service manual
110
draft – 31/05/2022 15:53
▪ 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 Cooling mode
▪ 0 V DC when operating in Heating mode
INFORMATION
Actual energize voltage is ±310 V DC.12 V DC is used to keep the coil energized.
Is the measured voltage correct?
Yes
No
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. The measured voltage MUST be:
▪ 12 V DC when operating in Defrost mode
▪ 0 V DC when operating in Heating mode
INFORMATION
Actual energize voltage is ±310 V DC.12 V DC is used to keep the coil energized.
Is the measured voltage correct?
Yes
No
Action
Perform a position check of the 4-way
valve, see "4.2.1 Checking
4
procedures" [ 108].
Perform a check the main PCB, see
4
"4.14 Main PCB" [ 184].
Action
Perform a position check of the 4-way
valve, see "4.2.1 Checking
4
procedures" [ 108].
Perform a check the main PCB, see
4
"4.14 Main PCB" [ 184].
EBLA04~08E + EDLA04~08E
Daikin Altherma 3 M
ESIE22-09 – 2022.05