Table of Contents
FlexFit Pro
4. The limitation of the EEV opening
Condition
Shut down
Standby
(temperature sensor off)
Cooling startup process
Heating startup process
Cooling, dehumidification
Heating
Defrosting
Oil return
Refrigerant discharge
6.2.6 Control of shutdown
1. Initiative shutdown mode (shutdown normally without protection)
When the air conditioner is in cooling or heating mode, the compressor get the shutdown signal, the current
frequency of the compressor is more than 55HZ (EE) , the compressor will decrease to 48HZ at the speed of
2HZ/s and shut down directly.
If the current frequency of the compressor is lower than 55HZ, it will shut down directly after it receives the
signal. Avoid that the sudden shutdown will cause too strong stress when in high working frequency.
After the compressor stops, the fan motor will execute the left heat blowing and then stops.
Shutdown because of the anti-freeze protection, the compressor will stop as initiative shut down mode/
2. Passive shut down mode (Error protection shut down)
When the system come to the pressure protection, over-current protection, high module temperature protection,
high condensation temperature protection and the unit shut down, no matter the frequency of the compressor
come to 55HZ, the unit will shut down directly.
6.2.7 Defrosting control in heating mode
During heating a need for defrost is detected by the outdoor coil temperature sensor, and defrosting is controlled by
the ambient and coil temperature sensors.
1. Initiate defrost:
1) After compressor running in heating for continuous 10 minutes (E) and for accumulated 50 minutes (E) , by
testing Te (defrosting temp sensor) or TC (testing of outdoor exchanger frosting condition) and outdoor ambient
temp sensor TA, when it meeting the following condition for continuous 5 minutes, the unit will enter defrosting
operation. In case of no defrosting operation caused by imbalanced refrigerant flow (caused by refrigerant lack or
other reason) , the unit will enter defrosting when any one of the two conditions are meet.
Entering condition:
Te≤C×TA-α OR TC≤C×TA-α and lasts for 5 minuts
Note: C:
TA<0°C, C=0.8
TA≥0°C, C=0.6
a. Entering temp. limit of defrosting 1: -15°C≤C×TA-α≤-2°C
b. Entering temp limit of defrosting 2: C×TA-α<-15°C & Te≤-15°C for continuous 5 minutes & accumulated
running time reaching 90 minutes.
c. Defrosting entering limit condition: indoor coil temp lower than 40 degree
d. Heating mode compressor running accumulated time stop/pause condition:
Detecting stop (end) : shifting from heating to cooling mode
Detecting pause: thermostat OFF, unit off.
Opening Requirement
Standard opening of the model, according to the
opening of last time
Standard opening of the model, according to the
mode before the temperature sensor is off
Execute the standard cooling opening of the model
Execute the standard heating opening of the model
Adjust automatically
Adjust automatically
Fixed opening
Fixed opening
Fixed opening
101
Lower Limit
Upper Limit
/
/
/
/
Standard opening
400
150
400
70
470
70
470
200
400
150
400
150
400
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Troubleshooting
