Mitsubishi Electric PLH Series, Техническое и сервисное руководство

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5
Coil frost protection
When indoor coil temperatuer becomes -15°C or below,coil frost protection will proceed as follows.
<Start condition>
After the compressor has been continuously operated for 3 minutes or more,and the indoor coil temperature has been -
15° or below for 3 minutes,the coil frost protection will start.
<Coil frost protection>
Compressor stops for 6 minutes,and then restarts.
lf the start condition is satisfied again during the first 10 minutes of compressor operation,both the indoor and outdoor
units stop,displaying a check code of“P8”on the remote controller.
<Termination conditions>
Coil frost protection is released when the start condition is not satisfied again during the allowance, or when the COOL
mode stops or changes to another mode.
(2) Indoor fan control
Indoor fan speed LOW/HIGH depends on the remote controller setting.
However, if an outdoor unit abnormality is detected, the indoor fan speed will be LOW, regardless of the remote controller
setting.
When the outdoor unit abnormality detection is released and the fan speed returns to the set speed, the quiet cycle control
will work.
(a) Normal control
( i ) Fan speed LOW/HIGH depends on the remote controller setting regardless of the thermostat ON/OFF.
(ii) Fan speed will remain on LOW if an abnormality in outdoor unit is detected. (5 minutes)
When the abnormality detection is released, the fan speed returns to the set speed through the quiet cycle control.
(b)Quiet cycle control
To prevent noise due to a sudden rise in fan output,the fan output rise is controlled by 1 step per 1 second.
( i ) When the outdoor unit abnormality detection is released and the fan speed changes from LOW to the set speed,the
quiet cycle control will work.
1
Start-up of outdoor unit abnormality detec-
tion.
2
Release of outdoor unit abnormality detec-
tion.
3
Unit stop due to outdoor unit abnormality
with P8 indication.
NOTE 1 : Quiet cycle control does not work when the fan speed is lowered.
NOTE 2 : Fan stops immediately if the unit stops or the check mode is started.
NOTE 3 : During normal operation,except the above case,the fan speed changes immediately according to the remote
controller setting.
5 minutes
SET
LOW
5 minutes
SET
LOW
OFF
(c) Fluctuate operation
( i ) Start condition
●
Turning ON the dipswitch SW1-2 enables the indoor fan to fluctuate by“SWING ON”command from the remote con-
troller.
(i i ) Operation
●
The fan output step changes by 1 step per 1 second in a 90-second cycle.
●
The thermostat ON/OFF does not influence the fluctuate operation.
●
When the fan speed is changed with the remote controller,the current output step will immediately change to the out-
put step of the set speed. After,the fluctuate operation will restart from the initial value.
●
lf an outdoor unit abnormality is detected,the indoor fan will run on LOW speed without a fluctuate operation.
After the abnormality is corrected,the fluctuate operation will restart from the initial value.
●
When the unit stops running or enters the check mode,the indoor fan will turn OFF immediately.
(iii) Auto vane
The auto vane operates independently of the fluctuate operation. While the fluctuate operation is selected,the auto vane
is continuously ON.