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153
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'10 • SR-T-091
e) During continuous compressor operation
In addition, when the speed command from the indoor controller of the indoor unit during heating operation has
counted 0 rps 10 times or more and all conditions of a), b), c) and e) above and the outdoor air temperature is 3°C or
less are satised (note that when the temperature for outdoor heat exchanger sensor (TH1) is -5°C or less: 62 rps or
more, -4°C or less: less than 62 rps), defrost operation is started.
2)
Ending conditions (Operation returns to the heating cycle when either one of the following is met.)
a) Outdoor heat exchanger sensor (TH1) temperature: 13ºC or higher
b) Continued operation time of defrosting → For more than 16 minutes and 50 seconds.
(7) Outline of cooling operation
(a) Operation of major functional components in Cooling mode
(b) Detail of control in each mode (Pattern)
1) Fuzzy operation
During the fuzzy operation, the air ow and the compressor speed are controlled by calculating the difference between
the indoor temperature setting correction temperature and the retum air temperature.
-20
-20 -15 -10 -5 0 5 10
-15
-10
-5
0
Outdoor air temperature (℃)
Outdoor heat exchanger temperature (℃)
-20
-20 -15 -10 -5 0 5 10
-15
-10
-5
0
Outdoor air temperature (℃)
Outdoor heat exchanger temperature (℃)
Defrost operation
start
Defrost operation
start
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Models 20～35 Model 50
Max. 16 minutes and 50 seconds
Heating operation
¡Defrast operation
Depends on an operation condition, the time can be longer than 7 minutes.
2~7 minutes
Hot keep operation
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