Service
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145
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'10 • HM-T-149
(with the operation command of fan speed 390rpm or higher), the compressor stops.
b) When the outdoor fan speed drops to 100rpm or lower 5 times within 60 minutes and the compressor stops, Fan alarm
is displayed and E48 is recorded in the Error Log and it enters the anomalous stop mode.
15) Anomalous stop by the compressor start/stop
a) When it fails to shift to the rotor position detection operation of compressor DC motor during 5 seconds after
establishing the compressor start condition, the compressor stops temporarily and restarts 3 minutes later.
b) If it fails to shift to the rotor position detection operation again at second time, it judged the anomalous compressor
start and the compressor stops. Compressor startup failure is displayed and E59 is recorded in the Error Log and it
enters the anomalous stop mode.
Pump-down control
It is possible to recover the refrigerant on the piping into the outdoor unit by this function.
Pump-down operation starts when the following conditions are fullled.
a) Within ten minutes since the operation mode is changed to Add heat. only mode.
b) SW1 [SW9] on the outdoor unit PCB is pressed for 2 seconds.
[Note]
Pump-down operation doesn't start even though SW1 [SW9] is pressed for 2 seconds, if more than 10 minutes has elapsed
since the mode is changed to Add heat. only.
In that case, change the mode other than Add heat. only and set again.
Note (1) Figure in [ ] is for model 71.
1) Control contents
a) Close the operation valve at the liquid side, (the operation valve at gas side should be left open.)
b) The compressor is started with the target speed (frequency) at
A
rps in cooling mode.
Model A rps
FDCW71VNX 62
FDCW100VNX 55
FDCW140VNX 45
c) Red and green lamps (LED) ash continuously on the outdoor control PCB.
d) Each of protection and error detection controls, excluding the low pressure control, is effective.
e) Outdoor fan is controlled as usual.
f) Electronic expansion valve is fully opened.
2) Control ending conditions
Stop control is initiated depending on any of following conditions
a) Low pressure of 0.087MPa or lower is detected for 5 seconds continuously.
i) Red LED: stays lighting, Green LED: keeps ashing
ii) It is possible to restart when the low pressure is 0.087MPa or higher.
iii) Electronic expansion valve (cooling/heating) is kept fully open..
b) Stop by the error detection control
i) Red LED: keeps ashing, Green LED: keeps ashing
ii) Restarting is prohibited. To return to normal operation, reset the power supply.
iii) Electronic expansion valve (cooling/heating) is kept fully open..
c) When cumulative operation time of compressor under the pump-down control is elapsed 5 minutes.
i) Red LED: stays OFF, Green LED: keeps ashing
ii) It is possible to pump-down again.
iii) Electronic expansion valve (cooling/heating) is kept fully open..
Note : After the stop of compressor, close the operation valve at the gas side.
Operation control function by the outdoor unit controller
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