Daikin FTXA20A Service Manual page 42

2 | Components
To perform a position check of the 4-way valve
Service manual
42
1 First perform an electrical check of the 4‑way valve, see
4
procedures" [ 40].
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
"5.3 Piping diagram" [
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
"5.3 Piping diagram" [
Is the flow correct?
Yes
No
4
176]).
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 "2.1.2 Repair
Leaks may be found in the refrigerant
circuit. Perform a pressure test of the
refrigerant circuit, see
procedures" [
4
176]).
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 "2.1.2 Repair
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
"2.1.1 Checking
4
procedures" [ 43].
"3.2.1 Checking
4
158].
4
procedures" [ 43].
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05