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Mitsubishi Electric PURY-WP200 Service Manual page 223

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[ IX Troubleshooting ]
Troubleshooting Principal Parts of HBC Controller
-6- Troubleshooting Principal Parts of HBC Controller
1. Pressure sensor
Troubleshooting flow chart for pressure sensor
START
Check the connectors on pressure sensor P1
for proper connections.
NO
Operating at the moment?
On the self-diagnosis monitor, measure
Outdoor high-pressure 63HS1
Outdoor low-pressure 63LS
HBC controller pressure P1 (liquid side)
Check whether the result is
63HS1 > P1 > 63LS
All the compressors of the outdoor units to
which the BC controller is connected are stopped.
10 minutes or longer after
the operation stops?
Check P1 on the self-diagnosis LED, and
check that the pressure reading is
0.098 MPa [14 psi] or above.
Check that the difference between each
detected pressure is 0.098MPa [14psi] or less.
Both the board and the pressure sensor are normal.
Check whether the refrigerant pipe and the
transmission line are connected correctly
between the indoor unit and the BC controller.
HWE1113B
OK?
YES
Note 1
Check whether the refrigerant pipe
NO
and the transmission line are
OK?
connected correctly between the indoor
unit and the BC controller.
YES
NO
NO
OK?
NO
Is Pd
OK?
YES
Fix the relation between the
NO
OK?
refrigerant piping and the
transmission line.
YES
Repair the fault.
Fix the relation between
NO
OK?
the refrigerant piping
and the transmission line.
YES
Check whether the contact of the pressure
sensor connector in trouble is not faulty.
NO
Remove the pressure sensor connector
P1 Ps?
from the board, and check the pressure.
YES
Short-circuit between connecter pins #2 and #3
on the circuit board, and check the pressure.
Replace the pressure sensor, which detects
less than 6MPa [870psi] pressure, with the
pressure sensor, which detects 6MPa [870psi]
or more pressure, check the pressure, and
check whether the detected pressure is
displayed normally.
Replace the pressure sensor.
- 214 -
Note 2
NO
OK?
YES
Note 3
Restore contact failure.
NO
Pressure 0MPa [0psi]
YES
NO
6MPa [870psi] pressure
or more is displayed.
YES
NO
OK?
YES
Replace the board.
GB
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