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24
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(12) Freezing cycle system protective control
(a)
Operating conditions:
When both of following conditions have continued for more than 5 minutes later than 5 minutes
after the start of operation.
1)
Command speed is higher than 60 rps
2)
During cooling, dehumidifying: Indoor heat exchanger temperature - Room temperature > – 4ºC
During heating: Indoor heat exchanger temperature - Room temperature < 6ºC
(b)
Detail of operation
The command speed repeats 30 minutes at 30rps
↔
2 minutes at 62 rps.
(c)
Restoration conditions:
When the condition becomes outside of either conditions 1) or 2) shown above
Note (1) This control is valid when the room air temperature is in the range of 10 to 40ºC at cooling and dehumidification operation and 0 to 40ºC at heating
operation.
(13) Compressor overheat protection
(a)
Purpose:
It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the compressor
overheat.
(b)
Detail of operation
1)
Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe.
Notes (1)
When the discharge pipe temperature is in the range of 100(90) to 125(110)ºC, the speed is reduced by 4 rps.
(2)
When the discharge pipe temperature is raised and continues operation for 20 seconds without changing, then the speed is reduced again by 4 rps.
(3)
If the discharge pipe temperature is still 90 (80) ºC or greater but less than 100 (90) ºC even when the inverter command speed is maintained for 3
minutes when the temperature is 90 (80) ºC or greater but less than 100 (90) ºC, the speed is raised by 2 rps and kept at that speed for 3 minutes. This
process is repeated until the command speed is reached.
(4)
Lower Limit Speed
Cooling
Heating
20, 25, 35 type
20
30
50 type
22
38
(5)
Values in ( ) are for Type 50.
2)
If the temperature of 125(110)ºC is detected by the sensor on the discharge pipe, then the compressor will stop immediately.
Simultaneously, the red LED on the printed circuit board of outdoor unit controller flashing 5 times for 0.5 second at
interval of 8 seconds.When the discharge pipe temperature drops and the time delay of 3 minutes is over, the unit starts
again within 1 hour but there is no start at the third time.
(14) Serial signal transmission error protection
(a)
Purpose:
Prevents malfunction resulting from error on the indoor
↔
outdoor signals.
(b)
Detail of operation:
When the indoor unit controller
↔
outdoor unit controller signals cannot be received, the compressor
is stopped immediately. Simultaneously, the red LED on the printed circuit board of outdoor unit controller flashing 6 times
for 0.5 second at intervals of 8 seconds. Once the operation stops, it does not start any more.
(TIMER light on the indoor unit flashing at the same time.)
Discharge pipe temperature (˚C)
Lower limit
(4)
After lapse of 3 min. or over
(3)
After lapse of 3 min. or over
(3)
After lapse of 3 min. or over
(3)
4 rps
4 rps
(1)
0 rps
(Example) Fuzzy
90
(80)
100
(90)
125
(110)
