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Overload prevention during heating
During HEAT operation, the temperature of the indoor heat
exchanger is used to control the frequency and lessen the load
on the compressor before the protective device is activated.
Cold-air prevention during heating
During heating, the fan speed is set to "LL" (very low) or stopped.
As the temperature of the indoor heat exchanger rises, the fan
speed is changed to the set speed.
Freeze prevention
During COOL or DRY operation, freezing is detected and
operation is stopped when the temperature of the indoor heat
exchanger matches the conditions below.
1.
Freeze-prevention operation is engaged when the
temperature of the indoor heat exchanger is below 43°F(6°C).
2.
Restart after freeze-prevention operation occurs when the
temperature of the indoor heat exchanger reaches 46°F(8°C)
or above.
a.
Area: Automatic capacity control
b.
When Point A has been exceeded, the operation frequency is
reduced by a certain proportion.
c.
Area: Frequency increase is prohibited.
d.
At Point B and below, overload prevention is ended and
control is the same as in the
a
area.
a.
Area: Automatic capacity control
b.
When the temperature drops below Point A, the operation
frequency is reduced by a certain proportion.
c.
Area: Frequency increase is prohibited.
d.
When the temperature reaches Point C or above, freezing
prevention is ended and control is the same as in the
a
area.
* When the temperature drops to below 36°F(2°C)
(continuously for 2 minutes or longer), the compressor stops.
Once the freeze condition is detected, the air conditioner will
work less than the maximum frequency until it is turned off.
Approx.
127
(53)
At stability of operation
TO1
TO2
TO3
The fan speed is increased depending
on the outside air temperature. (*1)
At start of operation
A
H
H +
LL
Stopped
A
*
B
C
B
Indoor heat exchanger
A. Control start
B. Control end
Fan speed [rpm] Outdoor air temp.
77
(25)
86
(30)
TC1 100
(38)
abc d
abcd
Indoor heat exchanger
temperature °F(°C)
Indoor heat exchanger
temperature °F(°C)
Indoor heat exchanger
temperature °F(°C)
Approx.
117
(47)
36
(2)
43
(6)
46
(8)
• The fan speed is forcibly changed to "LL" beginning 30 seconds
after the thermostat turns OFF.
• At stability of operation refers to operation when the room
temperature has approached the set temperature.
• When HEAT operation starts, the indoor fan is stopped until the
temperature of the indoor heat exchanger reaches 68°F(20°C)
or higher, or until the room temperature reaches 59°F(15°C) or
higher.
*1 It is applied only to CS-MKE9NB4U and CS-MKE12NB4U.
This function is enabled when the automatic operation is being
performed and the "Automatic Fan Speed" has been selected.
The fan speed might be increased during the automatic
operation. However, it is not the abnormal condition.
TC1 : CS-KE18NB4UW 104°F (40°C)
CS-MKE9NB4U, CS-MKE12NB4U 91°F (33°C)
TO1 : 35.6°F (2°C) or less
TO2 : 35.6°F (2°C) to 53.6°F (12°C)
TO3 : 53.6°F (12°C) or more
NOTE
7-2. Protective Functions
30