Daikin Altherma 3 M - Page 99

3 | Components
Service manual
99
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
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].
To perform a position check of the 4-way valve
1 First perform an electrical check of the 4‑way valve, see "3.2.1 Checking
procedures"[496].
When outdoor unit is combined with Heating + Cooling indoor unit
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
"6.3Piping diagram"[4331]).
INFORMATION
The flow through the 4-way valve is correct if the water temperature after the heat
exchanger rises/drops when operating in Heating/Cooling mode.
Is the flow correct? Action
Yes Skip the next step of this procedure.
No Perform the next step of this procedure.
3 Connect a manifold to one of the service ports of the refrigerant circuit and
check the pressure (suction, discharge). Compare with normal operation
conditions of the unit.
Refrigerant pressure correct? Action
Yes Replace the body of the 4‑way valve,
see "3.2.2Repair procedures"[4101].
No Leaks may be found in the refrigerant
circuit. Perform a pressure test of the
refrigerant circuit, see "4.2.1Checking
procedures"[4286].
4 De-activate Heating and activate Cooling operation via the user interface.
5 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
"6.3Piping diagram"[4331]).