Daikin RXTA30B2V1B, Service Manual

Page: 84 / 264

4 | Components
Service manual
84
RXTM-R+RXTP-R+ARXTP-R+RXTA-B+FTXTA30B2V1B(W)
(B)+35M5V1B
R32 Optimized Heating 4 Split
ESIE21-12A – 2022.02
5 Fill the refrigerant circuit with nitrogen until pressurized just above operating
pressure of the high pressure switch.
6 Measure the resistance between the Faston connections of the high pressure
switch.
Result: The switch MUST be open.
INFORMATION
If the high pressure switch was triggered open, it will stay open until the refrigerant
pressure drops below the reset pressure of the high pressure switch.
7 Lower the pressure of the nitrogen in the refrigerant circuit just above reset
pressure of the high pressure switch.
8 Measure the resistance between the Faston connections of the high pressure
switch.
Result: The switch MUST be open.
9 Lower the pressure of the nitrogen in the refrigerant circuit just below reset
pressure of the high pressure switch.
10 Measure the resistance between the Faston connections of the high pressure
switch.
Result: The switch MUST be closed.
High pressure switch connector
measurements are correct? Then
Yes High pressure switch is OK. Return to
the troubleshooting of the specific error
and continue with the next procedure.
No Replace the high pressure switch, see
"4.6.2 Repair procedures" [
4
84].
4.6.2 Repair procedures
To remove the high pressure switch
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see "4.17 Plate work" [
4
144].
Prerequisite: Recuperate the refrigerant from the refrigerant circuit, see
"5.2.2 Repair procedures" [ 4 216].
1 If needed, remove any parts to create more space for the removal of the high
pressure switch.
2 Disconnect the Faston connectors from the high pressure switch.
3 Supply nitrogen to the refrigerant circuit. The nitrogen pressure MUST NOT
exceed 0.02 MPa.
4 Wrap a wet rag around the components near the high pressure switch. Heat
the brazing point of the high pressure switch pipe using an oxygen acetylene
torch and remove the high pressure switch pipe from the refrigerant pipe
using pliers.