Jc" Outdoor Unit: Malfunction Of Low Pressure Sensor - Daikin R-410A Service Manual

SiBE39-402A

4.27 "JC" Outdoor Unit: Malfunction of Low Pressure Sensor

JC
Remote
Controller
Display
Applicable
AII outdoor unit models
Models
Method of Malfunction is detected from pressure detected by low pressure sensor.
Malfunction
Detection
Malfunction
When the low pressure sensor is short circuit or open circuit.
Decision
Conditions
! Defect of low pressure sensor
Supposed
! Connection of high pressure sensor with wrong connection.
Causes
! Defect of outdoor unit PC board.
Troubleshooting
∗1: Voltage measurement point
∗2: Refer to pressure sensor, pressure/voltage characteristics table on P200.
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
The low
pressure sensor is
connected to X45A (blue)
of outdoor unit PC
board (A1P).
YES
The
relationship
between the ∗1
VL and low pressure is
normal (see ∗2) when voltage
is measured between X45A pins
(2) and (3) of outdoor unit
PC board (A1P)
(see ∗1).
NO
Outdoor unit PC board A1P
Microcomputer
A/D input
Troubleshooting by Indication on the Remote Controller
NO
YES
+5V
GND
∗2 Measure voltage here.
Connect low pressure sensor
property and restart system.
Replace outdoor unit PC board
A1P.
Replace the low pressure sensor.
X45A
Red
Black
White
(V2808)
141