High Pressure Sensor - Daikin 2MXM50M Service Manual

ESIE16-02B | Part 2. Troubleshooting

2.4.2.5. High pressure sensor

Technical specification
The pressure sensor is an analog pressure sensor.
Location
Piping diagram
See "Outdoor unit" on
page 104.
Check procedure
Electrical check
PRELIMINARY ACTIONS
1. Switch off the Daikin unit via the user interface.
2. Switch off the Daikin unit with the field supplied circuit breaker.
3. Remove plate work when required.
PROCEDURE
1. Connect a pressure gauge to the high pressure service port and read the pressure.
2. From the graph below, determine the expected sensor output signal.
3. Power the Daikin unit.
I
NFORMATION
To know where to plug in the pressure sensor connector, see
4. Measure the voltage across high pressure sensor connector: pin 1-3 on the PCB; compare the measured voltage with the
expected voltage.
Page 52
RA R32 Split & multi split M-Series
Wiring diagram
See "Outdoor unit" on
page 99.
P = 1.38V -0.69
H H
51.0
45.9
40.8
35.7
30.6
25.5
Detected Pressure
20.4
P
H
(kg/cm )
2
15.3
10.2
5.1
0
-5.1
-0.5 0 0.5
Description
The pressure sensor measures the pressure in the high pressure
section of the refrigerant circuit.
Switch box
See "Outdoor unit" on
page 111.
V : Output Voltage (High Side) V
H DC
High Pressure (P )
H
1 1.5 2 2.5 3 3.5 4
Output Voltage (V , V )
H L
"Component checklist" on page
2.4. Component checklist
Component overview of unit
See "Outdoor unit" on page 110.
111.
4/04/17 | Version 1.1