E4" Outdoor Unit: Actuation Of Low Pressure Sensor - Daikin R410As Service Manual

Si39-302
2.15 " E4 " Outdoor Unit:
E4
Remote
Controller
Display
Applicable RXYQ5~48M
Models
Method of
Malfunction
Detection
Malfunction Error is generated when the low pressure is dropped under specific pressure.
Decision
Conditions
!
Supposed
!
Causes
!
!
Troubleshooting
∗
1: Voltage measurement point
∗
2: Refer to pressure sensor, pressure / voltage characteristics table on P282.
Troubleshooting
Actuation of Low Pressure Sensor
Abnormal drop of low pressure (Lower than 0.15MPa)
Defect of low pressure sensor
Defect of outdoor unit PC board
Stop valve is not opened.
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Is stop valve opened?
YES
Low pressure
at stop due to malfunction
is 0.15 MPa.
NO
Measure
the voltage (VL)
of X45A pin No. (2) - (3)
of outdoor PC board (A2P).∗1
Is the relationship
between low
voltage and VL
normal?
NO
Troubleshooting by Indication on the Remote Controller
NO
YES
YES
Open stop valve.
Out of gas, refrigerant system
clogging, wiring and piping wrong
connection, stop valve closed,
electronic expantion valve fully
close malfunction.
Replace the low pressure sensor.
Replace outdoor unit PC board
A1P.
(V2791)
173