Troubleshooting Problems With Major Components On Hbc; Pressure Sensor - Mitsubishi Electric PURY-M200YNW-A1 Service Handbook

[8-9 Troubleshooting Problems with Major Components on HBC ]

8-9

Troubleshooting Problems with Major Components on HBC

8-9-1

Pressure Sensor

Troubleshooting flow chart for pressure sensor
START
Check the connectors on pressure
sensor PS1, PS3, Pw1, Pw2, Pw3,
Pw4 for proper connections.
OK?
NO
Operating at the moment?
On the self-diagnosis monitor, measure
• Outdoor high-pressure 63HS1
• Outdoor low-pressure 63LS
• HBC pressure PS1, PS3 (refrigerant side)
• HBC pressure Pw1, Pw2, Pw3, Pw4 (water side)
Check whether the result is
63HS1 > PS1, PS3 > 63LS
Pw1, Pw3 > 0.01MPa
Pw2, Pw4 > Supply-water pressure
OK?
All the compressors of the outdoor units to
which the HBC is connected are stopped.
All the pumps of HBC are stopped.
10 minutes or longer after
the operation stops?
Check PS1, PS3, Pw1, Pw2, Pw3, Pw4 on the
self-diagnosis LED, and check that the pressure
reading is 0.098 MPa [14 psi] or above.
OK?
Check that the difference between each
detected pressure is 0.098MPa [14psi] or less.
OK?
Both the board and the pressure sensor are normal.
Check whether the refrigerant pipe and the
transmission line are connected correctly
between the outdoor unit and the HBC, the
indoor unit and the HBC.
OK?
34
- chapter 8
Repair the fault.
YES
Note 1
Check whether the refrigerant pipe / water
NO
pipe and the transmission line are connected
correctly between the outdoor unit and the
HBC, the indoor unit and the HBC.
YES
NO
NO
Is Pd > PS1, PS3 > Ps?
NO
YES
YES
Fix the relation between the
NO
refrigerant piping and the
transmission line.
YES
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.
OK?
YES
NO
Remove the pressure sensor connector
from the board, and check the pressure.
Pressure 0MPa [0psi]
YES
Short-circuit between connecter pins #2 and #3
on the circuit board, and check the pressure.
6MPa [870psi] pressure
or more is displayed.
YES
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.
OK?
YES
Replace the pressure sensor.
Note 2
NO
Note 3
Restore contact failure.
NO
NO
NO
Replace the board.
BS_08_L