Daikin Altherma 3 H HT ECH2O Service Manual page 126

4 | Components
To perform a position check of the 4-way valve
Service manual
126
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:
▪ 230 V AC when operating in Heating mode
▪ 0 V AC when operating in Defrost mode
Is the measured voltage correct?
Yes
No
1 First perform an electrical check of the 4‑way valve, see
4
procedures" [ 124].
When outdoor unit is combined with Heating + Cooling indoor unit
▪ 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 Activate Heating operation via the user interface.
INFORMATION
It is recommended to connect the service monitoring tool to the unit and verify the
operation mode of the 4-way valve.
2 Check with a contact thermometer (or by touching) if the flow through the 4-
way valve corresponds with the flow shown in the flow diagram. (See
"7.3 Piping diagram" [
Action
Perform a position check of the 4-way
valve, see
procedures" [
Perform a check the main PCB, see
"4.16 Main
Action
Perform a position check of the 4-way
valve, see
procedures" [
Perform a check the main PCB, see
"4.16 Main
4
413]).
"4.2.1 Checking
4
124].
4
PCB" [ 226].
"4.2.1 Checking
4
124].
4
PCB" [ 226].
"4.2.1 Checking
EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
ESIE22-11A – 2023.06