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2. Indoor fan speed control
(1) Indoor fan operates at the set speed by FAN SPEED CONTROL button.
In Auto the fan speed is as follows.
Set temperature minus room temperature: 2 : or more ·················································· High
Set temperature minus room temperature: Between 0.2 and 2 : ································· Med.
Set temperature minus room temperature: less than 0.2 :·············································· Low
(2) Cold air prevention control
1 When the compressor is not operating,
(1) if the temperature of room temperature thermistor RT11 is less than 19°C, the fan stops.
(2) if the temperature of room temperature thermistor RT11 is 19°C or more and
(1) if the temperature of indoor coil thermistor is less than 0°C, the fan stops.
(2) if the temperature of indoor coil thermistor is 0°C or more, the fan operates at Very Low.
2 When the compressor is operating,
(1) if the temperature of indoor coil thermistor is 40°C or more, the fan operates at set speed.
(2) if the temperature of indoor coil thermistor is less than 40°C and
(1) if heating operation starts after defrosting, the fan stops.
(2) if the temperature of room temperature thermistor RT11 is 19°C or less, the fan stops.
(3) if the temperature of room temperature thermistor RT11 is more than 19°C, the fan operates at Very Low.
NOTE : When 3 minutes have passed since the compressor started operation, this control is released regardless of the
temperature of RT11 and indoor coil thermistor.
3. High pressure protection
In HEAT operation the indoor coil thermistor detects the temperature of the indoor heat exchanger. The compressor opera-
tional frequency is controlled to prevent the condensing pressure from increasing excessively.
4. Overload starting
When the room temperature thermistor RT11 reads 18°C or more (SUZ-KA25/35) / 25°C or more (SUZ-KA50) , the com-
pressor runs with its maximum frequency regulated for 10 minutes after the start-up.
5. Defrosting
(1) Starting conditions of defrosting
When the following conditions a) ~ c) are satisfied, the defrosting starts.
a) The defrost thermistor reads -3°C or less.
b) The cumulative operation time of the compressor has reached any of the set valuesw [30, 35, 40, 45, 55, 65, 75, 85,
95, 105, 115, 125, 150 minutes (SUZ-KA25/35) / 31, 35, 45, 55, 65, 75, 85, 95, 105, 115, 150 minutes (SUZ-KA50)].
c) More than 5 minutes have passed since the start-up of the compressor.
w Set value of compressor operation time(hereinafter referred to as defrost interval)
This is decided by the temperature of defrost thermistor and ambient temperature thermistor, the previous defrosting
time. For example, the first defrost interval is 40 minutes long, and the second is 45 minutes long. The third and sub-
sequent intervals are set to be longer, and less frequent, depending on defrosting time.
The third and subsequent defrost intervals follow any of the three patterns ... 5 or 10 to 20 minutes longer, the same,
or 5 or 10 to 20 minutes shorter compared with the previous defrost interval ... with the longest 150 minutes and the
shortest 30 minutes.
(2) Releasing conditions of defrosting
Defrosting is released when any of the following conditions is satisfied:
a) The defrost thermistor continues to read 5°C or more (SUZ-KA25) / 10°C or more (SUZ-KA35) / 15°C or more (SUZ-
KA50) for 30 seconds.
b) Defrosting time has exceeded 10 minutes.
c) Any other mode than HEAT mode is set during defrosting.
Downloaded from AC-Manual.com Manuals
Initial temperature difference
53
Difference between room
temperature and set tem-
Fan speed
perature during operation
0.2 : 1.7 :
2 :
4 :
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