Mitsubishi Electric CITY MULTI CMB-P1010V-E, Руководство по обслуживанию, Страница: 124 / 154

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See Troubleshooting of pressure
sensor .
Check the contacts of CNCT on the
INV board.
Check the DCCT polarity.
• With SW1-1 OFF, is the inverter’s
output wiring open?
• With SW1-1 OFF, is a compressor
which is not specified for this model
connected to the inverter’s output?
If none of the items in 1) to 3) is appli-
cable, and if the trouble reappears even
after the power is switched on again,
replace the INV board and the DCCT
(when replacing the circuit board, be
sure to connect all the connectors,
ground wires, etc. securely) by the fol-
lowing procedure.
1 Replace the INV board only. If it re-
covers, the INV board is defective.
2 If it does not recover, reinstall the
INV board and replace the DCCT.
If it recovers, the DCCT is defec-
tive.
If it does not recover after
1
and
2
above, both the INV board and the
DCCT are defective.
If the model name plate on the heat
source unit says that it is an exclusive
R22 model, and if error “7130” has oc-
curred, the MAIN board for the heat
source unit is a R407C model circuit
board, so replace it with the MAIN
board for the R22 model.
If the model name plate for the indoor
unit is an exclusive R22 model, install
a unit which can also operate with
R407C.
If the model name plate on the indoor
unit indicates that it is also capable of
operating with R407C, and error “7130”
occurs, the indoor unit’s circuit board
is for an exclusive R22 model, so re-
place it with the circuit board for a unit
which is also capable of using R407C.
Pressure
sensor
abnormality
(heat source
unit)
IDC sensor/
circuit
abnormality
Different
indoor model
connected
abnormality
1. When pressue sensor detects 1kg/
cm 2 G (0.098MPa) or less during
operation, heat source unit once
stops with 3 minutes restarting
mode, and restarts if the detected
pressure of pressure sensor ex-
ceeds 1kg/cm
2
G (0.098MPa)
imediately before restarting.
2. If the detected pressure of sen-
sor is less than 1kg/cm 2 G
(0.098MPa) immediately before
restarting, error stop is com-
menced displaying 5201.
3. Under 3 minutes restarting
mode, LED displays intermittent
fault check.
4. During 3 minutes after com-
pressor start, defrosting and 3
minutes after defrosting opera-
tions, trouble detection is ig-
nored.
1. If IDC 20 A peak is detected
just before the inverter starts, or
2. If IDC 10 A peak is detected
during inverter operation after
5 seconds has passed since the
inverter started when the INV
board’s SW1-1 is OFF.
An exclusive R22 refrigerant indoor
unit was connected to a R407C
refrigerant heat source unit.
5201
5301
7130
1) Pressutre sensor trouble.
2) Inner pressure drop due to a leak-
age.
3) Broken cover.
4) Coming off of pin at connector por-
tion, poor contact.
5) Broken wire.
6) Faulty thermistor input circuit of
MAIN board.
1) Contact is faulty.
2) The current sensor (DCCT) is con-
nected with reverse polarity.
3) An error was made in the SW1-1
setting.
4) The INV board is defective. The
current sensor (DCCT) is defective
1) An error was made in the MAIN
board of the heat source unit (re-
placed with the wrong circuit
board).
2) An error was made in selecting the
indoor unit (installation error).
3) An error was made in the indoor
unit’s circuit board (replaced with
the wrong circuit board)..
Checking code Meaning, detecting method Cause Checking method & Countermeasure