Midea MOAB30-09HFN8-QRD0GW, Service Manual

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 Product Features 4 
3. Basic Functions
3.1 Abbreviation
Unit element abbreviations
Abbreviation Element
T1 Indoor room temperature
T2 Coil temperature of evaporator
T3 Coil temperature of condenser
T4 Outdoor ambient temperature
Tsc Adjusted setting temperature
TP Compressor discharge temperature
In this manual, such as CDIFTEMP, HDIFTEMP2, TCE1,
TCE2...etc., they are well-setting parameter of EEPROM.
3.2 Fan Mode
When fan mode is activated:
• The outdoor fan and compressor are stopped.
• Temperature control is disabled and no temperature
setting is displayed.
• The indoor fan speed can be set to 1%~100%, or
auto.
• The louver operations are identical to those in cooling
mode.
• Auto fan: In fan-only mode, AC operates the same as
auto fan in cooling mode with the temperature set at
24°C.
3.3 Cooling Mode
3.3.1 Compressor Control
Reach the configured temperature:
1) When the compressor runs continuously for less than
120 minutes.
• If the following conditions are satisfied, the
compressor ceases operation.
• While calculated frequency(fb) is less than minimum
limit frequency(FminC).
• While protective time is more than or equal to ten
minutes.
• While T1 is lower than or equal to (Tsc-CDIFTEMP-
0.5°C)
Note: CDIFTEMP is EEPROM setting parameter. It is 2°C
usually.
2) When the compressor runs continuously for more than
120 minutes.
• If the following conditions are satisfied, the
compressor ceases operation.
• When calculated frequency(fb) is less than minimum
limit frequency(FminC).
• When protective time is more than or equal to ten
minutes.
• When T1 is lower than or equal to (Tsc-CDIFTEMP).
Note: CDIFTEMP is EEPROM setting parameter. It is 2°C
usually.
3) 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
• Various frequency limit shutdown occurs.
3.3.2 Indoor Fan Control
1) In cooling mode, the indoor fan operates continuously.
The fan speed can be set to 1%-100%, or auto.
2) Auto fan
• Descent curve
• When T1-Tsc is lower than or equal to 3.5°C, fan
speed reduces to 80%;
• -When T1-Tsc is lower than or equal to 1°C, fan
speed reduces to 60%;
• -When T1-Tsc is lower than or equal to 0.5°C, fan
speed reduces to 40%;
• -When T1-Tsc is lower than or equal to 0°C, fan
speed reduces to 20%;
• -When T1-Tsc is lower than or equal to -0.5°C, fan
speed reduces to 1%.
• Rise curve
• When T1-Tsc is higher than 0°C, fan speed
increases to 20%;
• -When T1-Tsc is higher than 0.5°C, fan speed
increases to 40%;
• -When T1-Tsc is higher than 1°C, fan speed
increases to 60%;
• -When T1-Tsc is higher than 1.5°C, fan speed
increases to 80%;
• -When T1-Tsc is higher than 4°C, fan speed