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5
2
A
J
K
I
(˚C)
No.
7
Item
Freeze preventive control
(Low temperature release)
Outline of specifications
1) The cooling operation is performed as follows
based on the detected temperature of Tc sensor or
Tcj sensor.
When [J] zone is detected for 6 minutes
(Following figure), the commanded frequency is
decreased from the real operation frequency.
After then the commanded frequency changes
every 30 seconds 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.
If the commanded frequency becomes S0
because the operation continues in [J] zone, the
return temperature A is raised from 5°C to 12°C
until [ I ] zone is detected and the indoor fan
operates with [Fan] mode.
In heating operation, the freeze-preventive control
works if 4-way valve is not exchanged and the
following conditions are satisfied.
(However the temperature for J zone dashing
control is changed from 2°C to –5°C.)
<Conditions>
• When
Q
or
R
is established 5 minutes after
activation.
Q
Tcn ≤ Tc (n – 1) – 5
R
Tcn < Tc (n – 1) – 1 and Tcn ≤ Ta < 5°C
Remarks
Tc, Tcj:
Indoor heat exchanger
sensor temperature
Tcn:
Tc temperature when
5 minutes elapsed after
activation
Tc (n – 1):
Tc temperature at start
time