Daikin Sensira Series, Service Manual

Page: 40 / 172

2 | Components
Service manual
40
FTXF20~71A + FTXF20~25B + FTXF20~42C + ATXF20~71A + ATXF20~42C
+ RXF20~71A + RXF20~60B + RXF20~42C + ARXF20~71A + ARXF20~42C
Split Sensira R32
ESIE18-12E – 2021.02
Refrigerant pressure correct? Action
Yes Replace the body of the 4‑way valve,
see
"2.1.2 Repair procedures" [
4
41].
No Leaks may be found in the refrigerant
circuit. Perform a pressure test of the
refrigerant circuit, see
"3.2.1 Checking
procedures" [
4
129].
5 De-activate Heating and activate Cooling operation via the user interface.
6 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
"5.3 Piping diagram" [
4
151]).
Is the flow correct? Action
Yes 4‑way valve is OK. Return to the
troubleshooting of the specific error
and continue with the next procedure.
No Replace the body of the 4‑way valve,
see
"2.1.2 Repair procedures" [
4
41].
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.
7 With the unit operating, connect the service monitoring tool to the unit and
check whether the unit is operating in
Heating
or
Cooling
mode.
8 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
"5.3 Piping diagram" [ 4 151]).
Is the flow correct? Action
Yes 4‑way valve is OK. Return to the
troubleshooting of the specific error
and continue with the next procedure.
No Perform the next step of this procedure.
9 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
"2.1.2 Repair procedures" [
4
41].
No Leaks may be found in the refrigerant
circuit. Perform a pressure test of the
refrigerant circuit, see
"3.2.1 Checking
procedures" [
4
129].