Outdoor Unit: Actuation Of Low Pressure Switch - Panasonic Urban Multi MX1R Series Service Manual

PACD011001C2
3.16 Outdoor Unit:
E4 E4 E4 E4
Remote Controller
Display
„ Abnormal drop of low pressure (0 kg/cm² [0 MPa])
Supposed Causes
„ Defect of low pressure sensor
„ Defect of outdoor unit PC board
Troubleshooting
∗ 1: Voltage measurement point
∗ 2: Refer to pressure sensor, pressure - voltage characteristics table on P587.
Troubleshooting Urban Multi "MX1R, ME1R Series" Using R-407C
Actuation of Low Pressure Switch
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Low pressure
YES
at stop due to malfunction is
2
0.0 kg / cm .
NO
Measure
the voltage (VL)
of X21A pin No. (2) - (3)
YES
of outdoor PC board (A1P). ∗1
Is the relationship
between low voltage
and VL
normal?
NO
Troubleshooting
Refrigerant shortage, refrigerant
system clogging, wiring and piping
wrong connection.
Replace the low pressure sensor.
Replace outdoor unit PC board A1P.
(VF042)
359