Pressure Sensor Check - Daikin SkyAir RZR-TA Series Service Manual

Check

5.11 Pressure Sensor Check

CHECK 12
Detected Pressure
P , P
H
2
(psi) (kg/cm ) (MPa)
725 51.0
653 45.9
580 40.8
508
35.7
435 30.6
363 25.5
290 20.4
218 15.3
145
10.2
72.5 5.1
0
0
–72.5 –5.1
Voltage Measurement Point of the High Pressure Sensor
Voltage Measurement Point of the Low Pressure Sensor
304
L
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
Output Voltage V
Main PCB (A1P)
Microcomputer
A/D input
Measure DC voltage between these wires.
Main PCB (A1P)
Microcomputer
A/D input
Measure DC voltage between these wires.
P (MPa) =
H
P (MPa) =
L
1 MPa = 145 psi
P : High pressure (MPa)
H
P : Low pressure (MPa)
L
High Pressure (P )
H
V : Output Voltage (High Side) (VDC)
H
V : Output Voltage (Low Side) (VDC)
L
Low Pressure (P )
L
2 2.5 3 3.5 4
(VDC)
, V
H L
+5 V
X17A
(red)
+5 V
X18A
(blue)
(4)
(3)
(2)
(1)
4.15 4.15
× V – × 0.5
H
3.0 3.0
1.7 1.7
× V – × 0.5
L
3.0 3.0
(4) Red
High
(3) Black
pressure
sensor
(2)
White
(1)
Red
Black
Low
pressure
White sensor
Part 6 Service Diagnosis
SiUS281811EA