Daikin Emura RXJ20A5V1B Service Manual page 56

4 | Components
Service manual
56
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?
Yes
No
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?
Yes
No
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
"7.3 Piping diagram" [
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?
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 With the unit operating, connect the service monitoring tool to the unit and
check whether the unit is operating in Heating or Cooling mode.
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 of the specific
operation mode. (See
Action
Skip the next step of this procedure.
Perform the next step of this procedure.
Action
Replace the body of the 4‑way valve,
see "4.1.2 Repair
Leaks may be found in the refrigerant
circuit. Perform a pressure test of the
refrigerant circuit, see
procedures" [
4
207]).
Action
4‑way valve is OK. Return to the
troubleshooting of the specific error
and continue with the next procedure.
Replace the body of the 4‑way valve,
see "4.1.2 Repair
4
"7.3 Piping diagram" [
4
procedures" [
"5.2.1 Checking
4
182].
4
procedures" [
207]).
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
57].
57].