Pressure Sensor Check - Daikin VRV S RXQ4/5ARV1 Service Manual

SiAF332111E

6.12 Pressure Sensor Check

CHECK 12 Pressure Sensor and Voltage Characteristics
Detected Pressure
(kg/cm
Voltage Measurement Point of the High Pressure Sensor
Voltage Measurement Point of the Low Pressure Sensor
*1. RXQ4/5AR
*2. RXMQ8-12AR
Part 6 Service Diagnosis
P , P
H L
2
)(MPa)
51.0 5.0
45.9 4.5
40.8 4.0
35.7 3.5
30.6 3.0
25.5 2.5
20.4 2.0
15.3 1.5
10.2 1.0
5.1 0.5
0 0
–5.1 –0.5
–0.5 0 0.5 1 1.5
Output Voltage V
Microcomputer
A/D input
Make measurement of DC
voltage between these wires.
Microcomputer
A/D input
Make measurement of DC voltage between these wires.
P (MPa) =
H
P (MPa) =
L
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 *1
X32A (Red) *2
(4)
(3)
(2)
(1)
+5 V
X18A *1
X31A (Blue) *2
(4)
(3)
(2)
(1)
Check
4.15 4.15
× V – × 0.5
H
3.0 3.0
1.7 1.7
× V – × 0.5
L
3.0 3.0
Red
High
Black
pressure
sensor
White
Red
Black
Low
pressure
White sensor
353