Mitsubishi HMA100V Technical Manual

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Service
'10 • HM-T-149
8) Power transistor temperature control (FDCW100VNX, 140VNX only)
This control monitors the power transistor temperature (TIP) from the start operation of compressor, and when the
following condition is established, compressor speed (frequency) is controlled.
Power transistor temperature (°C)
Reset
Retention
Reduce compressor speed
at every 1 minute.
77
80
70
73
FDCW100VNX
FDCW140VNX
9) Anomalous power transistor current
a) If the current value of power transistor exceeds the setting value, the compressor stops in order to prevent from
overcurrent of inverter.
b) When the current value of power transistor exceeds the specified value and compressor stops 4 times within 30
minutes, Inverter error is displayed and E42 is recorded in the Error Log. And it enters the anomalous stop mode.
10) Anomalous inverter PCB
If the power transistor detects any anomaly for 15 minutes including the time of compressor stopping, Inverter error is
displayed and E51 is recorded in the Erro Log, and it enters the anomalous stop mode.
11) Anti-freeze control by the compressor frequency control
It depends on the command from indoor unit
12) Refrigerant amount shortage protection
Under the control of compressor protection start
Ⅲ
during cooling operation, the following control is performed by
detecting the liquid line temperature of indoor unit (BT15=Thi-L) and inlet water temperature (BT3=Twin).
[Control condition] When the state that the temperature of indoor unit water heat exchanger (Thi-R=Thi-L) does
not become lower than the inlet water temperature (BT3=Twin) by 4°C or more for 1 minute
continuously.
[Control contents] It judges that the owing of refrigerant into the indoor unit is insufcient so that the compressor
is stopped and insufcient refrigerant amount error is displayed and E57 is recorded in the Error
Log.
13) Broken wire detection on temperature thermistor and low pressure sensor
a) Outdoor heat exchanger temperature thermistor, outdoor air temperature thermistor and low pressure sensor.
If the following is detected for 5 seconds continuously within 2 minutes to 2 minutes 20 seconds after the compressor
ON, the compressor stops. After a delay of 3 minutes, the compressor restarts but if the same anomaly is detected
repeatedly 3 times within 40 minutes, the compressor stops with the anomalous stop mode.
・
Outdoor heat exchanger temperature thermistor (Tho-R1, R2): -50°C or lower
・
Outdoor air temperature thermistor (Tho-A): -30°C or lower
・
Low pressure sensor (LPT): 0Volt or lower, or 3.49Volt or higher
Note : During defrosting operation and for 3 minutes after the end of defrosting operation, this control is not performed.
b) Discharge pipe temperature thermistor, suction pipe temperature thermistor
If the following is detected for 5 seconds continuously within 10 minutes to 10 minutes 20 seconds after the
compressor ON, the compressor stops. After a delay of 3 minutes, the compressor restarts but if the same anomaly is
detected repeatedly 3 times within 40 minutes, the compressor stops with the anomalous stop mode.
・
Discharge pipe temperature thermistor (Tho-D): -10°C or lower
・
Suction pipe temperature thermistor (Tho-S): -50°C or lower
Note : During defrosting operation and for 3 minutes after the end of defrosting operation, this control is not performed.
14) Fan motor error
a) If the outdoor fan speed is detected 100rpm or lower for 30 seconds continuously under the outdoor fan control mode
Operation control function by the outdoor unit controller

Mitsubishi HMA100V Specifications

General

Brand	Mitsubishi
Model	HMA100V
Category	Heat Pump
Language	English