Mitsubishi Electric SUZ-KA71VA4 Manual de servicio descargar pdf (Pagina 21)

2121

SUZ-KA25VA4.TH SUZ-KA35VA4.TH SUZ-KA50VA4.TH SUZ-KA60VA4.TH SUZ-KA71VA4.TH

temperature thermistor, outdoor heat exchanger temperature

No. Symptoms

Abnormal point/

Condition

RemedyCondition

Outdoor unit

does not op-

erate.

1-time flash

every

2.5 seconds

Outdoor power sys-

tem

Overcurrent protection cut-out operates 3 consecutive times

within 1 minute after the compressor gets started.

Reconnect connector of compres-

sor.

Refer to 11-5. "How to check in-

verter/compressor".

Check stop valve.



Outdoor thermistors Discharge temperature thermistor shorts, or opens during

compressor running.

defrost thermistor, P.C. board

thermistor or ambient temperature thermistor shorts, or opens

during compressor running.

Refer to 11-5.F"Check of outdoor

thermistors".



Outdoor control sys-

tem

Nonvolatile memory data cannot be read properly.

Replace inverter P.C. board. 

6-time flash

2.5 seconds

OFF

Serial signal The communication fails between the indoor and outdoor unit

for 3 minutes.

11-time flash

2.5 seconds

OFF

Stop valve/

Closed valve

Closed valve is detected by compressor current. Check stop valve.



'Outdoor unit

stops and

restarts 3

minutes later'

is repeated.

2-time flash

2.5 seconds OFF

Overcurrent protec-

tion

Large current flows into intelligent power module.

Reconnect connector of compressor.

Refer to 11-5. "How to check in-

verter/compressor".

Check stop valve.



3-time flash

2.5 seconds OFF

Discharge tempera-

ture overheat pro-

tection

Temperature of discharge temperature thermistor exceeds

116°C, compressor stops. Compressor can restart if discharge

temperature thermistor reads 100°C or less 3 minutes later.

Check refrigerant circuit and refrig-

erant amount.

Refer to 11-5. "Check of LEV".



4-time flash

2.5 seconds OFF

Fin temperature

/P.C. board tem-

perature thermistor

overheat protection

Temperature of fin temperature thermistor on the heat sink

exceeds 72 ~ 86°C or temperature of P.C. board temperature

thermistor on the inverter P.C.board exceeds 72 ~ 85°C.

Check around outdoor unit.

Check outdoor unit air passage.

Refer to 11-5. "Check of outdoor

fan motor".



5-time flash

2.5 seconds OFF

High pressure pro-

tection

Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost

thermistor exceeds 70°C in COOL mode.

Check refrigerant circuit and refrig-

erant amount.

Check stop valve.



8-time flash

2.5 seconds OFF

Compressor syn-

chronous abnormal-

ity

The waveform of compressor current is distorted.

Reconnect connector of compressor.

Refer to 11-5. "How to check in-

verter/compressor".



10-time flash

2.5 seconds OFF

Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds

after outdoor fan start-up.

Refer to 11-5. "Check of outdoor

fan motor.

Refer to 11-5. "Check of inverter

P.C. board.



12-time flash

2.5 seconds OFF

Each phase current

of compressor

Each phase current of compressor cannot be detected nor-

mally.

Refer to 11-5. "How to check in-

verter/compressor".



13-time flash

2.5 seconds OFF

DC voltage DC voltage of inverter cannot be detected normally. Refer to 11-5. "How to check in-

verter/compressor".



Outdoor unit

operates.

1-time flash

2.5 seconds OFF

Frequency drop by

current protection

When the input current exceeds approximately 7A(KA25)/

8A(KA35)/12A(KA50)14A(KA60)/16A(KA71), compressor

The unit is normal, but check the

following.

Check if indoor filters are clogged.

Check if refrigerant is short.

Check if indoor/outdoor unit air

circulation is short cycled.



3-time flash

2.5 seconds OFF

Frequency drop by

high pressure pro-

tection

Temperature of indoor coil thermistor exceeds 55°C in HEAT

mode, compressor frequency lowers.

Frequency drop by

defrosting in COOL

mode

Indoor coil thermistor reads 8°C or less in COOL mode, com-

pressor frequency lowers.

4-time flash

2.5 seconds OFF

Frequency drop by

discharge tempera-

ture protection

Temperature of discharge temperature thermistor exceeds

111°C, compressor frequency lowers.

Check refrigerant circuit and refrig-

erant amount.

Refer to 11-5. "Check of LEV".

Refer to 11-5. "Check of outdoor

thermistors".



7-time flash

2.5 seconds OFF

Low discharge tem-

perature protection

Temperature of discharge temperature thermistor has been

50°C or less for 20 minutes.

Refer to 11-5. "Check of LEV".

Check refrigerant circuit and refrig-

erant amount.



8-time flash

2.5 seconds OFF

PAM protection

PAM: Pulse Ampli-

tude Modulation

The overcurrent flows into PFC (Power factor correction :

IC820) or the bus-bar voltage reaches 394 V or more, PAM

stops and restarts.

This is not malfunction. PAM pro-

tection will be activated in the fol-

lowing cases:

1. Instantaneous power voltage

drop. (Short time power failure)

2. When the power supply voltage

is high.

9-time flash

2.5 seconds OFF

Inverter check mode The connector of compressor is disconnected, inverter check

mode starts.

Check if the connector of the com-

pressor is correctly connected.

Refer to 11-5. "How to check

inverter/compressor".



NOTE: 1. The location of LED is illustrated at the right figure. Refer to 11-6-1.

2. LED is lighted during normal operation.

The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.

(Example) When the flashing frequency is “2”.

OFF

2.5-second OFF

0.5-second ON

LED

Flashing ĺ

Inverter P.C. board



Check of indoor/outdoor connecting

wire.

Replace indoor or outdoor P.C.

board if abnormality is displayed

again.

(KA25/35/50)

(KA60/71)

Zero cross detecting

circuit

Zero cross signal for PAM control cannot be detected.

LED

indication

check

code

Fin temperature thermistor,

frequency lowers.

11-2. TROUBLE SHOOTING CHECK TABLE

OCH545

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 45 46

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Mitsubishi Electric SUZ-KA71VA4 Manual de servicio Pagina 21

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