Product Features 5
increases to 100%.
3.3.3 Outdoor Fan Control
• The outdoor unit will be run at different fan speed
according to T4 and compressor running frequency..
• For different outdoor units, the fan speeds are
different.
3.3.4 Condenser Temperature Protection
When the condenser temperature exceeds a configured
value, the compressor ceases operations.
3.3.5 Evaporator Temperature Protection
When evaporator temperature drops below a configured
value, the compressor and outdoor fan ceases operations.
3.4 Heating Mode (Heat Pump Units)
3.4.1 Compressor Control
1) Reach the configured temperature
• If the following conditions are satisfied, the
compressor ceases operation.
• While calculated frequency(fb) is less than
minimum limit frequency(FminH).
• When protective time is more than or equal to ten
minutes.
• When T1 is higher than or equal to Tsc+
HDIFTEMP2.
Note: HDIFTEMP2 is EEPROM setting parameter. It is 2°C
usually.
• If one of the following conditions is satisfied, not
judge protective time.
• Compressor running frequency is more than test
frequency.
• When compressor running frequency is equal to
test frequency, T4 is more than 15°C or no T4 or T4
fault.
• Change setting temperature.
• Turbo or sleep function on/off.
2) When the current is higher than the predefined safe
value, surge protection is activated, causing the
compressor to cease operations.
3.4.2 Indoor Fan Control:
1) In heating mode, the indoor fan operates continuously.
The fan speed can be set to 1%-100%, or mute.
2) Auto fan
• Rise curve
• When T1-Tsc is higher than -1.5°C, fan speed
reduces to 80%;
• -When T1-Tsc is higher than 0°C, fan speed reduces
to 60%;
• -When T1-Tsc is higher than 0.5°C, fan speed
reduces to 40%;
• -When T1-Tsc is higher than 1°C, fan speed reduces
to 20%.
• Descent curve
• When T1-Tsc is lower than or equal to 0.5°C, fan
speed increases to 20%;
• -When T1-Tsc is lower than or equal to 0°C, fan
speed increases to 60%;
• -When T1-Tsc is lower than or equal to -1.5°C, fan
speed increases to 80%;
• -When T1-Tsc is lower than or equal to -3°C, fan
speed increases to 100%.
3.4.3 Outdoor Fan Control:
• The outdoor unit will be run at different fan speed
according to T4 and compressor running frequency.
• For different outdoor units, the fan speeds are
different.
3.4.4 Defrosting mode
• The unit enters defrosting mode according to changes
in the temperature value of T3, T4 as well as the
compressor running time.
• In defrosting mode, the compressor continues to run,
the indoor and outdoor motor will cease operation,
the defrost light of the indoor unit will turn on, and
the “
” symbol is displayed.
• If any one of the following conditions is satisfied,
defrosting ends and the machine switches to normal
heating mode:
• T3 rises above TCDE1°C.
• T3 maintained above TCDE2°C for 80 seconds.
• Unit runs for 15 minutes consecutively in defrosting
mode.
• If T4 is lower than or equal to -22°C and compressor
running time is more than TIMING_DEFROST_TIME,
if any one of the following conditions is satisfied,
defrosting ends and the machine switches to normal
heating mode:
• Unit runs for 10 minutes consecutively in defrosting
mode.
• T3 rises above 10°C.
• For 9k~18k unit, if T3 is lower than -3°C and
compressor running time is more than 120 minutes,
If any one of the following conditions is satisfied,
defrosting ends and the machine switches to normal
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