-
25
-
◆ < II >
(a) Operating conditions: When all of the following conditions are met.
1 After the inverter command speed is at a value other than 0 rps for 8 minutes, when the indoor heat exchanger temperature
is less than 5°C.
2 When the inverter command speed is more than 20 rps.
(b) Detail of operation:
1 Indoor heat exchanger temperature
=
<
5°C
The inverter command speed is reduced 4rps at each 20 seconds. Lower limit speed is 20 rps.
2 5ºC <Indoor heat exchanger temperature
=
<
8°C
The inverter command speed is maintained for 20 seconds.
(c) Reset conditions: When either of the following condition is satisfied.
1 The inverter command speed is less than 20rps.
2 The indoor heat exchanger temperature is more than 8°C.
The inverter command speed is raised by 1rps and kept at that speed for 20 seconds. This process is repeated until the
calculated speed is reached.
(4) Cooling overload protective control
(a) Operating conditions: When the outdoor unit is operating with the outdoor unit speed of other than 0 rps, and when the
outdoor air temperature sensor (Th5) becomes 41°C or over for 30 seconds continuously.
(b) Detail of operation
1) Outdoor fan is stepped up by 3 speed step. (Upper limit speed is 7th speed.)
2) The lower limit of control speed is set to 30 rps and even if the calculated result becomes lower than that after fuzzy
calculation, the speed is kept to 30 rps. However, when the thermo becomes OFF, the speed is reduced to 0 rps.
(c) Reset conditions: When either of the following condition is satisfied.
1 When the outdoor air temperature becomes 40°C or less.
2 When the inverter command speed is 0rps.
(5) Cooling low outdoor temperature protective control
◆ < I >
(a) Operating conditions: When the outdoor air temperature sensor (Th5) is 22°C or lower continues for 30 seconds while
outdoor speed is other than 0rps.
(b) Detail of operation: After the outdoor fan operates at 3rd speed for 60 seconds; the corresponding outdoor heat
exchanger temperature shall implement the following controls.
1 Outdoor heat exchanger temperature
=
<
22°C
After the outdoor fan speed drops (down) to one speed for 60 seconds; if the outdoor heat exchanger temperature is
lower than 22°C, gradually reduce the outdoor fan speed by 1 speed. (Lower limit speed is 1st speed)
2 22°C < Outdoor heat exchanger temperature
=
<
40°C
After the outdoor fan speed maintains at 3rd speed for 20 seconds; if the outdoor heat exchanger temperature is 22°C~
40°C, maintain outdoor fan speed.
3 Outdoor heat exchanger tempeature > 40°C
After the outdoor fan speed rises (up) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is
higher than 40°C, gradually increase outdoor fan speed by 1 speed. (Upper limit speed is 3rd speed)
(c) Reset conditions: When the either of the following conditions is satisfied
1 When the outdoor air temperature sensor (Th5) becomes 25°C or higher.
2 When the inverter command speed is 0rps.
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