Daikin VRV X RXQ6-48ANR Series, Service Manual, Page: 278 / 297

Check SiME341909EA
272 Part 6 Service Diagnosis
6.9 Pressure Sensor Check
CHECK 12
Pressure Sensor and Voltage Characteristics
Voltage Measurement Point of the High Pressure Sensor
Voltage Measurement Point of the Low Pressure Sensor
High Press u re (P
H
)
Lo w Press u re (P
L
)
O u tp u t V oltage V
H
, V
L
Detected Press u re
40. 8
35.7
30.6
25.5
20.4
15.3
10.2
5.1
–5.1
0
45.9
51.0 5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–0.5
–0.5 0 0.5 1 1.5 2 2.5 3 3.5 4
( V DC)
(kg/cm
2
)(MPa)
P
H
, P
L
P
H
(MPa) = × V
H
– × 0.5
P
L
(MPa) = × V
L
– × 0.5
P
H
: High press u re (MPa)
P
L
: Lo w press u re (MPa)
V
H
: O u tp u t V oltage (High Side) ( V DC)
V
L
: O u tp u t V oltage (Lo w Side) ( V DC)
4.15
3.0
4.15
3.0
1.7
3.0 1.7
3.0
+5 V
(4)
(3)
(2)
(1)
Red
Black
W hite
X32A (Red)
High
press u re
sensor
Microcomp u ter
A/D inp u t
Make meas u rement of DC
v oltage b et w een these w ires.
+5 V
(4)
(3)
(2)
(1)
Microcomp u ter
A/D inp u t
Make meas u rement of DC v oltage b et w een these w ires.
X31A (Bl u e)
Red
Black
W hite
Lo w
press u re
sensor