Daikin Sensira Series Service Manual page 62

2 | Components
Service manual
62
a
d
c
f
a High pressure switch protection control
b Pressure
c High pressure switch closed
d High pressure switch open
e High pressure switch operating pressure
f High pressure switch reset pressure
Unit High pressure
switch
RXF20~35A + S1PH
RXF20+25B +
RXF20~42C +
ARXF20~35A +
ARXF20~42C
RXF60A S1PH
RXF71A + S1PH
RXF50~60B +
ARXF50~71A
3 Disconnect the Faston connectors from the high pressure switch.
INFORMATION
Measure the continuity of all wiring between the high pressure switch and the
appropriate PCB. If NO continuity is measured, repair as needed, see
4
diagram" [ 142].
4 Measure the resistance between the Faston connections of the high pressure
switch.
Result: The switch MUST be closed.
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.
e b
Operating pressure
(MPa)
4.17
4.00
4.15
FTXF20~71A + FTXF20~25B + FTXF20~42C + ATXF20~71A + ATXF20~42C
+ RXF20~71A + RXF20~60B + RXF20~42C + ARXF20~71A + ARXF20~42C
Reset pressure
(MPa)
3.2
3.2
3.2
"5.2 Wiring
Split Sensira R32
ESIE18-12E – 2021.02