Protective Control Function - Mitsubishi Heavy Industries SRK10CNV Technical Manual

(11) Protective control function

(a) Frost prevention for indoor heat exchanger (During cooling or dehumidifying)
(i) Operating conditions
1) Indoor heat exchanger temperature (Th2) is lower than 2.5ºC.
2) 3 minutes elapsed after the start of operation.
(ii) Detail of frost prevention operation
Compressor
Indoor fan
Outdoor fan
(iii) Reset condition: Indoor heat exchanger temperature (Th2) is higher than 8ºC.
(b) Dew condensation prevention control [Cooling (including auto), cooling oriented dehumidifying operation]
(i) Operating condition: When the following conditions are met after 5 minutes or more of continuous
• The humidity sensor value is 68% or higher
(ii) Operation contents
1) Command of the electronic expansion valve.
2) When such a command is continued for 30 minutes or more, air direction
controls will be as listed below:
UP/ DOWN air flow
LEFT/ RIGHT air flow
(iii) Reset condition: When the following condition is satisfied.
• The humidity sensor value is less than 63%.
(c) Indoor fan motor protection
When the airconditioner is operating and the indoor fan motor is turned ON, if the indoor fan motor has operated at 300
rpm or under for more than 30 seconds, the unit enters first in the stop mode and then stops the entire system.
TIMER light illuminates simultaneously and the RUN light flashing 6-time at each 8-second.
(d) 3 minutes forced operation
When the compressor begins operating the thermal operation is not effective for 3 minutes, so operation continues as
is in the operation mode. (After 3 minutes has passed the thermal operation is effective.)
However, stopping the compressor via a stop signal or protection control has priority.
(e) Abnormality of outdoor unit
When an abnormal stop occurs 3-time with automatic recovery within 20 minutes after the outdoor unit's power supply
was turned on.
OFF
Protects the fan tap just before frost prevention control.
Depending on the stop mode
operation after operation starts.
Flap swing
Situations besides the ones described above
Louver swing
Situations besides the ones described above

-
Executes the command to the left.
Controls the level of the UP/DOWN flap.
Executes the command to the left.
Controls the front of the LEFT/RIGHT louver .
-
'14•SRK-T-153
Prevention control
Reset
63 68
Humidity (%)