8-5. Freeze preventive control (Low temperature release)
The cooling operation (including Dry operation) is performed as follows based on the detected temperature of Tc sensor or Tcj sensor.
When [J] zone is detected for T1 minutes (Following figure), the commanded frequency is decreased from the real operation frequency. After then the commanded frequency changes every 2 minutes while operation is performed in [J] zone.
T1
Normal | 1 minute |
In [K] zone, time counting is interrupted and the operation is held.
When [I] zone is detected, the timer is cleared and the operation returns to the normal operation.
(°C) |
|
|
|
7 |
| I | A |
| |||
6 |
|
| K |
|
|
| |
5 |
|
| J |
|
| ||
|
|
|
Fig.
In heating operation, the
Remarks:
Tcj : Indoor heat exchanger sensor temperature
8-6. High-temp release control
The heating operation is performed as follows based on the detected temperature of Tc sensor.
•When [M] zone is detected, the commanded frequency is decreased from the real operation frequency. After then the commanded frequency changes every 30 seconds while operation is performed in [M] zone.
•In [N] zone, the commanded frequency is held.
•When [L] zone is detected, the commanded frequency is returned to the original value by approx. 6Hz every 60 seconds.
8-7. Louver control
(1)Vertical air flow louver
Position of veritcal air flow louver is automatically controlled according to the operation mode. Besides, position of vertical air flow louver can be arbitrarily set by pressing [FIX] button.
The louver position which is set by [FIX] button is stored in the microcomputer, and the louver is automatically set at the stored position for the next operation.
(2)Swing
If [SWING] button is pressed when the indoor unit is in operation, the vertical air flow louver starts swinging. When [SWING] button is pressed, it stops swinging.
8-8. Filter sign display
(1)The operation time of the indoor fan is calculated, the filter lamp (Orange) on the display part of the main unit goes on when the specified time (240H) has passed. When a wired remote controller is connected, the filter reset signal is sent to the remote controller, and also it is displayed on LCD of the wired remote control.
(2)When the filter reset signal has been received from the wired remote control after [FILTER] lamp has gone on or when the filter check button (Temporary button) is pushed, time of the calculation timer is cleared. In this case, the measurement time is reset if the specified time has passed, and display on LCD and the display on the main unit disappear.
Remarks:
[FILTER] goes on
Tc (°C)
55 A
M
52N
48 B
L
Fig.
– 24 –
