Midea MHC-V12W/D2N8-B - Page 31

M thermal Mono
202004 29
Part 3 - Control
Table 3-7.1: Names and functions of the temperature sensors
Number
Sensor name
1
Sensor
code
Mode
Control functions
1
Discharge pipe temperature
sensor
Tp
Heating
 Electronic expansion valve control2
 Discharge superheat control
Cooling
 Electronic expansion valve control2
 Outdoor fan control3
 Discharge superheat control
2
Outdoor ambient temperature
sensor
T4
Heating
 Compressor startup control4
 Compressor output control5
 Electronic expansion valve control2
 Defrosting operation control7
 Low pressure protection control7
 Crankcase heater control9
Cooling
 Compressor startup control4
 Compressor output control5
 Electronic expansion valve control2
 Outdoor fan control3
 Crankcase heater control9
3
Air side heat exchanger
refrigerant outlet temperature
sensor
T3
Heating
 Electronic expansion valve control2
 Defrosting operation control7
 Outdoor fan control3
Cooling
 Compressor output control5
 Outdoor fan control3
4
Water side heat exchanger
refrigerant inlet (liquid pipe)
temperature sensor
T2
Heating
 Compressor output control5
DHW
5
Water side heat exchanger
refrigerant outlet (gas pipe)
temperature sensor
T2B
Heating
 Freeze prevention control10
6
Suction pipe temperature
sensor
Th
Heating
 Electronic expansion valve control2
Cooling
7
Water side heat exchanger
water inlet temperature
sensor
Tw_in
Heating
 Freeze prevention control10
Cooling
8
Water side heat exchanger
water outlet temperature
sensor
Tw_out
Heating
 Compressor output5 and on/off control6
 Freeze prevention control10
Cooling
DHW
9
Backup electric heater water
outlet temperature sensor
T1
Heating
 Compressor output control5
 Backup electric heater control
 DHW priority control11
 Auto mode control
Cooling
 Compressor output5 and on/off control6
 Auto mode control
DHW
 Compressor output control5
 Backup electric heater control
 DHW priority control11
10
Circuit 2 water outlet
temperature sensor
T1B
Heating
 Mixing valve control
11
Room temperature sensor
Built in wire controller
Ta
Heating
 Auto mode control
 Climate related curve
 Compressor output control5
Cooling
12
Domestic hot water tank
temperature sensor
T5
DHW
 Disinfection operation control
 DHW tank immersion heater control
 Backup electric heater control
 Auxiliary heat source control
 Solar energy kit control
 Compressor output control5
 DHW priority control11
Notes:
1. Sensor names in this service manual referring to refrigerant flow is
named according refrigerant flow during cooling operation refer to
Part 2, 3 “Refrigerant Flow Diagrams”.
2. Refer to Part 3, 4.5 “Electronic Expansion Valve Control”.
3. Refer to Part 3, 4.6 “Outdoor Fan Control”.
4. Refer to Part 3, 3 “Startup Control”.
5. Refer to Part 3, 4.2 “Compressor Output Control”.
6. Refer to Part 3, 1 “Stop Operation”.
7. Refer to Part 3, 6.2 “Defrosting Operation”.
8. Refer to Part 3, 5.2 “Low Pressure Protection Control”.
9. Refer to Part 3, 2.1 “Crankcase Heater Control”.
10. Refer to Part 3, 2.2 “Freeze Prevention Control”.
11. Refer to Part 3, 6.4 “Fast DHW Operation”.
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