Mitsubishi Heavy Industries FDC1000KXZWE1, Руководство по обслуживанию

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102
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'14 • KX-SM-200
Error code
Remote control:
7-segment display:
LED Green Red
Indoor unit
Heat source unit
Content
E44
E44-1*1
Liquid flooding anomaly
(CM1)
Keeps flashing Stays OFF
Keeps flashing *2
1. Applicable model
5. Troubleshooting
Heat source units
Diagnosis Countermeasure
Are there
any wrong connection of
refrigerant piping and/or signal wiring ?
. Check the numbers of connected indoor units
recognized by heat source unit in comparison
with those numbers in
utility drawing.
Are there any
excessive refrigerant charged at site?
. Check the calculation result of additional
refrigerant charging amount and the
record of additional refrigerant
charged amount.
Are there any
leakage of refrigerant through
valve sheet of SVR, DPR?
. Check the temperature difference between
before and after SVR, DPR.
Are there any
fault in subcooling coil circuit ?
. Check whether the EEVSC is kept open
(at cooling mode)
. Check whether the thermistor of Tho-H is
inserted in the thermistor holder properly.
. Check whether the characteristics
of Tho-H and PSL
is OK.
Is the
superheat control of
indoor unit OK at cooling mode?
. Check whether the indoor EEV is kept open or not.
. Check whether ThI-R1, R2, R3 are installed at proper
position or the characteristics of them are OK.
. Check whether the air filter is clogged.
. Check whether the indoor
fan rotates.
Is the
superheat control of
outdoor unit OK at heating mode?
. Check whether EEVW1, 2 is kept open or not.
. Check whether Tho-R1, R2 are
installed at proper position or the
characteristics of them is OK.
. Check whether the characteristics
of PSL are OK.
Save data for 30 minutes before stopping in Mente PC.
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
Is the
characteristics of Tho-C1
OK ?
Check and save the data of
operating condition.
Check the ROM version.
Confirmation of SV1, 2 operation.
Correct the connection of
refrigerant piping and/or
signal wiring properly.
Adjust refrigerant amount
properly.
Replace SVR, DPR.
Replace the coil of SVR.
• Replace EEVSC.
• Check the coil of EEVSC

Replace the coil of EEVSC
• Replace Tho-H.
• Replace PSL.
• Replace indoor EEV.
• Check the coil of EEV

Replace the coil of EEV.
• Check the installed position
of ThI-R1, R2, R3

Replace ThI-R, if necessary.
• Check the air filter.
• Check the connection of indoor
fan motor connector.
Replace indoor fan motor
* By checking ThI-R1, R2, R3
from indoor unit operation data
of Mente PC, specify the indoor
unit which tends to be liquid
flooding (ThI-R3.=.ThI-R2 shows
the probability of liquid flooding)
• Replace EEVW1, 2.
• Check the coil of EEVW1, 2

Replace the coil of EEVW1, 2.
• Check the installed position of
Tho-R1, R2

Replace Tho-R, if necessary.
• Replace Tho-C1.
Correct the data with Mente PC
and ask our consultation.
2. Error detection method
When 5ºC or lower of the
under-dome temperature
superheat is detected for 15
minutes continuously or for 30
minutes continuously.
3. Condition of error displayed
When above anomaly is
detected 3 times within 90
minutes.
4. Presumable cause
• Unmatching of refrigerant
piping and/or signal wiring
• Overcharging of refrigerant
• Anomalous control of
superheat
• Anomalous circuit of liquid
refrigerant by-pass
• Anomalous refrigerant circuit
of subcooling coil
• Under-dome temperature
(Tho-C1) anomaly
Note: If the error does not recur, connect the Mente PC and continue to collect data.
*1 E44-1: CM1 *2 E44-1: 1-time flash