Mitsubishi Electric PK-2.5FLD Technical & Service Manual page 22

5 Coil frost protection
When the pipe temperature 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 pipe temperature has been - 15°C or
below for 3 minutes, the coil frost protection will start.
<Coil frost protection>
Compressor stops for 6 minutes, and then restarts.
If the start condition is satisfied again during the first 10 minutes of compressor operation, both the indoor and outdoor units
stop, and the remote controller displays this occurrence.
<Termination conditions>
Coil frost protection released when the start condition is not satisfied again during the allowance, or when the COOL mode
stops changes another mode.
(2)Indoor fan control
Indoor fan speed 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.
(3)Auto vane control
Auto vane position depends on the remote controller setting.
(4)Detecting abnormalities in the outdoor unit
After the compressor has been continuously operated for 3 minutes, if the difference between the pipe temperature and the
room temperature is out of RANGE C for 1 minute, the indoor fan speed will turn to LOW. Five minutes later, if the differ-
ence is still out of RANGE C, the outdoor unit is functioning abnormally. Thus, the compressor will stop and the remote con-
troller will display this occurrence.
RANGE A : The pipe temperature is more than 5 degrees above room temperature.
RANGE B : The pipe temperature is within 5 degrees either way of room temperature.
RANGE C : The pipe temperature is more than 5 degrees below room temperature.
(5)AUTO VANE CONTROL
1 1 Frequency judgement
When the unit operates for the first time after the circuit breaker turned to ON, the frequency, 50Hz or 60Hz, is judged by
the horizontality sensing switch. If The frequency cannot be judged immediately for some reason, the sensing operation
continues for 3 minutes with the vane motor at ON.
If the frequency cannot be judged yet after 3-minute sensing, the vane motor turns to OFF. But the AIR DISCHARGE
DIRECTION display continues to be indicated.
2 2 During cooling operation
When the cooling operation starts, the vane is automatically set to the horizontal However, the desired direction among four
below-listed can be selected with the vane button on the remote controller.
a) 10°
b) 30° downward
c) 60° downward (PK-2.5/3/4FL(S)A)
d) 70° downward (PK-2.5/3/4FL(S)A)
e) Automatic swing
NOTE : 30° is available only when the fan speed is HIGH.
<AUTO RETURN>
When discharge 60° or 70° continues for 1 hour with the fan speed at LOW, the
discharge direction turns to the horizontal discharge automatically.
NOTE1 : After that, 60° or 70° is available by setting with the remote controller, and
it continues for 1 hour.
NOTE2 : If the discharge direction changes from 60° or 70° , the direction returns
to the horizontal discharge when 1 hour has passed since the discharge 60° start-
ed.
NOTE3 : If the discharge direction changes from 60° (or 70° ) to the horizontal dis-
charge, the 1-hour timer to return the horizontal discharge is cancelled.
3 3 During the operation OFF, the auto vane is in the airflow shut-off position.
4 4 When the vane motor is out of order or the connector is badly connected, the
remote controller display of the remote controller does not change.
22
10°
30°
60° (PK-2.5/3/4)
70° (PK-2.5/3/4)
Automatic
swing
(PK-2.5/3/4)