– 53 –
No.
7
Item
Freeze preventive
control
(Low temperature
release)
Outline of specifications
1) The cooling operation (including Dry operation) is
performed as follows based on the detected tem-
perature 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 30 seconds
while operation is performed in [J] zone.
Remarks
Tcj : Indoor heat
exchanger sensor
temperature
8
Normal
Twin
T1
6 minutes
6 minutes
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 [L]
mode.
In heating operation, the freeze-preventive control
works if 4-way valve is not exchanged and the
condition is satisfied.
High-temp release
control
1) 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.
Setup at shipment
Control temp (°C)
A
B
56 (54)
52 (52)
NOTE :
When the operation has started or when Tc became
lower than 30°C after start of the operation, tempera-
ture is controlled between values in parentheses of A
and B.
Same when thermostat is
turned off.
5
2
K
I
J
A
(˚C)
A
B
L
N
M
Tc (˚C)
