Mitsubishi Electric M Series Manual page 551

M series
MXZ-3B/4B/5B
Indication
Symptom
No.
LED1(Red) LED2(Yellow)
Outdoor unit
operates.
20
Once Lighting
Twice Lighting
21
22
Lighting
3 times
23 4 times Lighting
5 times Lighting
24
Outdoor unit
25 9 times
operates Lighting
normally.
Lighting Lighting
26
NOTE 1. The location of LED is illustrated at the right figure.
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".
ON
2.5-second OFF
OFF
Abnormal point / Condition
The input current exceeds
Primary current protection
17 A (MXZ-4B80VA)/18 A (MXZ-5B100VA)
The current of the compressor exceeds
Secondary current protection
10 A (MXZ-4B80/5B100VA)
High-pressure protection
The indoor gas pipe temperature exceeds 45°C during heating.
Defrosting in cooling The indoor gas pipe temperature falls 3°C or below during cooling.
Discharge temperature
The discharge temperature exceeds 100°C during operation.
protection
The frequency of the compressor is kept 80 Hz or more and the discharge
Low discharge
temperature is kept under 50°C (COOL mode) /40°C (HEAT mode) for
temperature protection
more than 40 minutes.
Cooling high-pressure
The outdoor heat exchanger temperature exceeds 58°C during operation.
protection
Inverter check mode The unit is operated with emergency operation switch.
Normal
0.5-second ON
2.5-second OFF
MULTI SYSTEM Inverter Heat Pump
Condition
15 A (MXZ-3B54/3B68/4B71VA)/
.
12 A (MXZ-3B54/3B68/4B71VA)/
.
-
0.5-second ON
Outdoor electronic control P.C. board (Parts side)
MXZ-3B54/3B68/4B71VA
LED2 LED1
Lighting
MXZ-4B80/5B100VA
LED1 LED2
Lighting
C-549