Daikin RXTA30B2V1B, Service Manual

Page: 52 / 264

4 | Components
Service manual
52
RXTM-R+RXTP-R+ARXTP-R+RXTA-B+FTXTA30B2V1B(W)
(B)+35M5V1B
R32 Optimized Heating 4 Split
ESIE21-12A – 2022.02
To perform a position check of the 4-way valve
1 First perform an electrical check of the 4‑way valve, see "4.1.1 Checking
procedures" [ 4 50].
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" [
4
242]).
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
"4.1.2 Repair procedures" [
4
53].
No Leaks may be found in the refrigerant
circuit. Perform a pressure test of the
refrigerant circuit, see
"5.2.1 Checking
procedures" [
4
211].
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" [
4
242]).
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.