Mitsubishi Electric CITY MULTI PUMY-P112VKM6, Руководство по обслуживанию

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OCH790 _42
1501 (U2): Refrigerant shortage trouble
Chart 1 of 2
Abnormal points and detection methods
• All of the following conditions have been satisfied for 15
consecutive minutes:
- The compressor is operating in HEAT mode.
- Discharge superheat is 80°C [144°F] or more.
- Difference between TH7 and TH3 fits the formula of
TH7−TH3 < 5°C [9°F]
- The saturation temperature converted from the pres -
sure detected by the high pressure sensor is below
35°C [95°F].
• All of the following conditions have been satisfied:
- The compressor is in operation.
- When cooling, discharge superheat is 80°C [144°F]
or more, and the saturation temperature converted
from the pressure detected by the high pressure
sensor is over −40°C [−40°F].
- When heating, discharge superheat is 90°C [162°F]
or more.
Causes and checkpoints
• Defective operation of stop valve (not fully open)
• Defective thermistor
• Defective outdoor multi controller circuit board
• Indoor LEV performance failure
• Gas leakage or shortage
• Defective 63HS
TH3:
Thermistor <Outdoor liquid pipe>
TH7:
Thermistor <Ambient>
LEV:
Linear expansion valve
63HS:
High pressure sensor
Diagnosis of failure
Refer to the diagnosis of error code 5104.
Check relevant thermistor wirings and connector
contacts of the outdoor multi controller circuit
board.
Disconnect the thermistor wiring and check the
resistance.
Open the stop valve (ball valve) fully.
Repair the refrigerant leak.
Connect the connector properly
(Repair or replace it in the case of breakage).
Continue to the next page.
Is there refrigerant leak?
Is the error code 5104 displayed when
restarted?
Is there any abnormality on connec-
tors such as disconnection, half-dis-
connection or breakage?
Is the outdoor stop valve (ball valve)
fully open?
Yes
(Leaking)
No
Yes
(5104)
Yes
Yes
No
(1501)
No
No
(No leaking)