Daikin EBLA04E V Series Service Manual page 172

4 | Components
Service manual
172
draft – 31/05/2022 15:53
1 Recuperate the refrigerant from the refrigerant circuit, see
4
procedures" [ 261].
2 Fill the refrigerant circuit with nitrogen until pressurized just below operating
pressure of the high pressure switch.
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
High pressure switch
S1PH
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" [ 281].
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.
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.
e b
Operating pressure (MPa) Reset pressure (MPa)
4.03~4.15
"5.2.2 Repair
3.05~3.35
"7.2 Wiring
EBLA04~08E + EDLA04~08E
Daikin Altherma 3 M
ESIE22-09 – 2022.05