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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.
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.
Fig. 8-5-1
In heating operation, the freeze-preventive control
works if 4-way valve is not exchanged and the
condition is satisfied.
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.
Fig. 8-6-1
7
6
5
K
I
J
A
(°C)
55 A
52
48 B
L
N
M
Tc (°C)
T1
Normal 1 minute
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