–
–
'14 • KX-SM-221
(5) Protective control
(a) High pressure protective control/error
If the high pressure exceeds . MPa, the compressor speed is reduced gradually.
It reduces to 0 rps at the lowest.
If the high pressure still rises to . MPa, the compressor stops.
(b) Low pressure protective control/error
If the low pressure drops below 0. MPa, the compressor speed is reduced gradually.
It reduces to 0 rps at the lowest.
If the low pressure still drops below 0. MPa, the compressor stops.
(c) Discharge pipe temperature control/error
If discharge pipe temperatures (detected with Tho-D, -D) exceed 0ºC, the compressor speed is reduced gradually. (To 0
rps at the lowest) If the temperatures still continue to rise beyond 0ºC, the compressor stops.
(d) Compressor compression ratio protective control
If the compressor compression ratio exceeds the setting value, the compressor speed is reduced gradually.
It reduces to 0 rps at the lowest.
(e) Current safe control
(i) The current safe control monitors current values at T-phase of inverter. If the value exceeds the setting value, the com-
pressor speed is reduced.
If the value is higher than the setting value even if the speed is reduced, the speed is reduced further.
(ii) This control is reset if the current value at T-phase of inverter becomes lower than the setting value – A for minutes
continuously or lower than the setting value for minutes continuously.
(f) Current cut control
(i) Current sensor built in the power transistor monitors current values output from the inverter. If the value exceeds the
setting value, the current cut control stops the compressor. The compressor starts automatically minutes after the stop.
(ii) If the above control activates times within minutes, and the operation is stopped with the error stop.
State of the error continues for minutes after the error stop. The error can be reset by operating the inspection reset
from the remote control.
(g) Under-dome temperature protective control
If the under-dome temperature exceeds the setting value, the compressor speed is reduced gradually.
It reduces to 0 rps at the lowest.
(6)
Test run
(a)
Start conditions
(i)
Turn ON the test run switch (SW-). The switch is invalid if it is turned ON before the power ON.
(ii)
Pump down switch (SW-) must be turned OFF.
(b)
Contents of control
(i)
Turning ON the dip switch (SW-) conducts cooling operation and turning OFF (SW-) conducts heating
operation.
)
Cooling operation
Compressor operation frequency control is conducted by the cooling low pressure control.
)
Heating operation
Compressor operation frequency control is operated by the heating high pressure control.
(ii)
Test run start signal under corresponding operation mode is transmitted to all indoor units connected.
(c)
End conditions
(i)
When the test run switch (SW-) is turned OFF, it stops.
(ii)
When it has stopped anomalously by the error control during test run, the error is displayed in the same way as the
case of normal operation and the state of anomalous stop is kept ON even if the test run switch (SW-) is turned
OFF.
